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22 results on '"Throop, H. B."'

1. A Statistical Review of Light Curves and the Prevalence of Contact Binaries in the Kuiper Belt

Author

Showalter, Mark R., Benecchi, Susan D., Buie, Marc W., Grundy, William M., Keane, James T., Lisse, Carey M., Olkin, Cathy B., Porter, Simon B., Robbins, Stuart J., Singer, Kelsi N., Verbiscer, Anne J., Weaver, Harold A., Zangari, Amanda M., Hamilton, Douglas P., Kaufmann, David E., Lauer, Tod R., Mehoke, D. S., Mehoke, T. S., Spencer, J. R., Throop, H. B., Parker, J. W., and Stern, S. Alan

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

We investigate what can be learned about a population of distant KBOs by studying the statistical properties of their light curves. Whereas others have successfully inferred the properties of individual, highly variable KBOs, we show that the fraction of KBOs with low amplitudes also provides fundamental information about a population. Each light curve is primarily the result of two factors: shape and orientation. We consider contact binaries and ellipsoidal shapes, with and without flattening. After developing the mathematical framework, we apply it to the existing body of KBO light curve data. Principal conclusions are as follows. (1) When using absolute magnitude H as a proxy for size, it is more accurate to use the maximum of the light curve rather than the mean. (2) Previous investigators have noted that smaller KBOs have higher-amplitude light curves, and have interpreted this as evidence that they are systematically more irregular in shape than larger KBOs; we show that a population of flattened bodies with uniform proportions could also explain this result. (3) Our analysis indicates that prior assessments of the fraction of contact binaries in the Kuiper Belt may be artificially low. (4) The pole orientations of some KBOs can be inferred from observed changes in their light curves; however, these KBOs constitute a biased sample, whose pole orientations are not representative of the population overall. (5) Although surface topography, albedo patterns, limb darkening, and other surface properties can affect individual light curves, they do not have a strong influence on the statistics overall. (6) Photometry from the OSSOS survey is incompatible with previous results and its statistical properties defy easy interpretation. We also discuss the promise of this approach for the analysis of future, much larger data sets such as the one anticipated from the Rubin Observatory.

Published
2021
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2. Frontiers in Planetary Rings Science

Author

Brooks, Shawn M., Becker, Tracy M., Baillié, K., Becker, H. N., Bradley, E. T., Colwell, J. E., Cuzzi, J. N., de Pater, I., Eckert, S., Moutamid, M. El, Edgington, S. G., Estrada, P. R., Evans, M. W., Flandes, A., French, R. G., García, Á., Gordon, M. K., Hedman, M. M., Hsu, H. -W., Jerousek, R. G., Marouf, E. A., Meinke, B. K., Nicholson, P. D., Pilorz, S. H., Showalter, M. R., Spilker, L. J., Throop, H. B., and Tiscareno, M. S.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

We now know that the outer solar system is host to at least six diverse planetary ring systems, each of which is a scientifically compelling target with the potential to inform us about the evolution, history and even the internal structure of the body it adorns. These diverse ring systems represent a set of distinct local laboratories for understanding the physics and dynamics of planetary disks, with applications reaching beyond our Solar System. We highlight the current status of planetary rings science and the open questions before the community to promote continued Earth-based and spacecraft-based investigations into planetary rings. As future spacecraft missions are launched and more powerful telescopes come online in the decades to come, we urge NASA for continued support of investigations that advance our understanding of planetary rings, through research and analysis of data from existing facilities, more laboratory work and specific attention to strong rings science goals during future mission selections.

Published
2020

3. Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt Object

Author

Stern, S. A., Weaver, H. A., Spencer, J. R., Olkin, C. B., Gladstone, G. R., Grundy, W. M., Moore, J. M., Cruikshank, D. P., Elliott, H. A., McKinnon, W. B., Parker, J. Wm., Verbiscer, A. J., Young, L. A., Aguilar, D. A., Albers, J. M., Andert, T., Andrews, J. P., Bagenal, F., Banks, M. E., Bauer, B. A., Bauman, J. A., Bechtold, K. E., Beddingfield, C. B., Behrooz, N., Beisser, K. B., Benecchi, S. D., Bernardoni, E., Beyer, R. A., Bhaskaran, S., Bierson, C. J., Binzel, R. P., Birath, E. M., Bird, M. K., Boone, D. R., Bowman, A. F., Bray, V. J., Britt, D. T., Brown, L. E., Buckley, M. R., Buie, M. W., Buratti, B. J., Burke, L. M., Bushman, S. S., Carcich, B., Chaikin, A. L., Chavez, C. L., Cheng, A. F., Colwell, E. J., Conard, S. J., Conner, M. P., Conrad, C. A., Cook, J. C., Cooper, S. B., Custodio, O. S., Ore, C. M. Dalle, Deboy, C. C., Dharmavaram, P., Dhingra, R. D., Dunn, G. F., Earle, A. M., Egan, A. F., Eisig, J., El-Maarry, M. R., Engelbrecht, C., Enke, B. L., Ercol, C. J., Fattig, E. D., Ferrell, C. L., Finley, T. J., Firer, J., Fischetti, J., Folkner, W. M., Fosbury, M. N., Fountain, G. H., Freeze, J. M., Gabasova, L., Glaze, L. S., Green, J. L., Griffith, G. A., Guo, Y., Hahn, M., Hals, D. W., Hamilton, D. P., Hamilton, S. A., Hanley, J. J., Harch, A., Harmon, K. A., Hart, H. M., Hayes, J., Hersman, C. B., Hill, M. E., Hill, T. A., Hofgartner, J. D., Holdridge, M. E., Horányi, M., Hosadurga, A., Howard, A. D., Howett, C. J. A., Jaskulek, S. E., Jennings, D. E., Jensen, J. R., Jones, M. R., Kang, H. K., Katz, D. J., Kaufmann, D. E., Kavelaars, J. J., Keane, J. T., Keleher, G. P., Kinczyk, M., Kochte, M. C., Kollmann, P., Krimigis, S. M., Kruizinga, G. L., Kusnierkiewicz, D. Y., Lahr, M. S., Lauer, T. R., Lawrence, G. B., Lee, J. E., Lessac-Chenen, E. J., Linscott, I. R., Lisse, C. M., Lunsford, A. W., Mages, D. M., Mallder, V. A., Martin, N. P., May, B. H., McComas, D. J., McNutt, R. L., Mehoke, Jr. D. S., Mehoke, T. S., Nelson, D. S., Nguyen, H. D., Núñez, J. I., Ocampo, A. C., Owen, W. M., Oxton, G. K., Parker, A. H., Pätzold, M., Pelgrift, J. Y., Pelletier, F. J., Pineau, J. P., Piquette, M. R., Porter, S. B., Protopapa, S., Quirico, E., Redfern, J. A., Regiec, A. L., Reitsema, H. J., Reuter, D. C., Richardson, D. C., Riedel, J. E., Ritterbush, M. A., Robbins, S. J., Rodgers, D. J., Rogers, G. D., Rose, D. M., Rosendall, P. E., Runyon, K. D., Ryschkewitsch, M. G., Saina, M. M., Salinas, M. J., Schenk, P. M., Scherrer, J. R., Schlei, W. R., Schmitt, B., Schultz, D. J., Schurr, D. C., Scipioni, F., Sepan, R. L., Shelton, R. G., Showalter, M. R., Simon, M., Singer, K. N., Stahlheber, E. W., Stanbridge, D. R., Stansberry, J. A., Steffl, A. J., Strobel, D. F., Stothoff, M. M., Stryk, T., Stuart, J. R., Summers, M. E., Tapley, M. B., Taylor, A., Taylor, H. W., Tedford, R. M., Throop, H. B., Turner, L. S., Umurhan, O. M., Van Eck, J., Velez, D., Versteeg, M. H., Vincent, M. A., Webbert, R. W., Weidner, S. E., Weigle II, G. E., Wendel, J. R., White, O. L., Whittenburg, K. E., Williams, B. G., Williams, K. E., Williams, S. P., Winters, H. L., Zangari, A. M., and Zurbuchen, T. H.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The Kuiper Belt is a distant region of the Solar System. On 1 January 2019, the New Horizons spacecraft flew close to (486958) 2014 MU69, a Cold Classical Kuiper Belt Object, a class of objects that have never been heated by the Sun and are therefore well preserved since their formation. Here we describe initial results from these encounter observations. MU69 is a bi-lobed contact binary with a flattened shape, discrete geological units, and noticeable albedo heterogeneity. However, there is little surface color and compositional heterogeneity. No evidence for satellites, ring or dust structures, gas coma, or solar wind interactions was detected. By origin MU69 appears consistent with pebble cloud collapse followed by a low velocity merger of its two lobes., Comment: 43 pages, 8 figure

Published
2020
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4. The Geology and Geophysics of Kuiper Belt Object (486958) Arrokoth

Author

Spencer, J. R., Stern, S. A., Moore, J. M., Weaver, H. A., Singer, K. N., Olkin, C. B., Verbiscer, A. J., McKinnon, W. B., Parker, J. Wm., Beyer, R. A., Keane, J. T., Lauer, T. R., Porter, S. B., White, O. L., Buratti, B. J., El-Maarry, M. R., Lisse, C. M., Parker, A. H., Throop, H. B., Robbins, S. J., Umurhan, O. M., Binzel, R. P., Britt, D. T., Buie, M. W., Cheng, A. F., Cruikshank, D. P., Elliott, H. A., Gladstone, G. R., Grundy, W. M., Hill, M. E., Horanyi, M., Jennings, D. E., Kavelaars, J. J., Linscott, I. R., McComas, D. J., McNutt, R. L., Protopapa, S., Reuter, D. C., Schenk, P. M., Showalter, M. R., Young, L. A., Zangari, A. M., Abedin, A. Y., Beddingfield, C. B., Benecchi, S. D., Bernardoni, E., Bierson, C. J., Borncamp, D., Bray, V. J., Chaikin, A. L., Dhingra, R. D., Fuentes, C., Fuse, T., Gay, P. L, Gwyn, S. D. J., Hamilton, D. P., Hofgartner, J. D., Holman, M. J., Howard, A. D., Howett, C. J. A., Karoji, H., Kaufmann, D. E., Kinczyk, M., May, B. H., Mountain, M., Pätzold, M., Petit, J. M., Piquette, M. R., Reid, I. N., Reitsema, H. J., Runyon, K. D., Sheppard, S. S., Stansberry, J. A., Stryk, T., Tanga, P., Tholen, D. J., Trilling, D. E., and Wasserman, L. H.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The Cold Classical Kuiper Belt, a class of small bodies in undisturbed orbits beyond Neptune, are primitive objects preserving information about Solar System formation. The New Horizons spacecraft flew past one of these objects, the 36 km long contact binary (486958) Arrokoth (2014 MU69), in January 2019. Images from the flyby show that Arrokoth has no detectable rings, and no satellites (larger than 180 meters diameter) within a radius of 8000 km, and has a lightly-cratered smooth surface with complex geological features, unlike those on previously visited Solar System bodies. The density of impact craters indicates the surface dates from the formation of the Solar System. The two lobes of the contact binary have closely aligned poles and equators, constraining their accretion mechanism.

Published
2020
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5. The Rings of Jupiter

Author

de Pater, Imke, Hamilton, D. P., Showalter, M. R., Throop, H. B., and Burns, J. A.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

A review of the jovian ring system, Comment: This is Chapter 6 in: Planetary Ring Systems, Eds. M. S. Tiscareno and C. D. Murray. Cambridge University Press, Cambridge, UK. In Press (2017)

Published
2017
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6. Surface Compositions Across Pluto and Charon

Author

Grundy, W. M., Binzel, R. P., Buratti, B. J., Cook, J. C., Cruikshank, D. P., Ore, C. M. Dalle, Earle, A. M., Ennico, K., Howett, C. J. A., Lunsford, A. W., Olkin, C. B., Parker, A. H., Philippe, S., Protopapa, S., Quirico, E., Reuter, D. C., Schmitt, B., Singer, K. N., Verbiscer, A. J., Beyer, R. A., Buie, M. W., Cheng, A. F., Jennings, D. E., Linscott, I. R., Parker, J. Wm., Schenk, P. M., Spencer, J. R., Stansberry, J. A., Stern, S. A., Throop, H. B., Tsang, C. C. C., Weaver, H. A., Weigle II, G. E., Young, L. A., and Team, the New Horizons Science

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The New Horizons spacecraft mapped colors and infrared spectra across the encounter hemispheres of Pluto and Charon. The volatile ices CH$_4$, CO, and N$_2$, that dominate Pluto's surface, have complicated spatial distributions resulting from sublimation, condensation, and glacial flow acting over seasonal and geological timescales. Pluto's H$_2$O ice "bedrock" is also mapped, with isolated outcrops occurring in a variety of settings. Pluto's surface exhibits complex regional color diversity associated with its distinct provinces. Charon's color pattern is simpler, dominated by neutral low latitudes and a reddish northern polar region. Charon near infrared spectra reveal highly localized areas with strong NH$_3$ absorption tied to small craters with relatively fresh-appearing impact ejecta., Comment: in Science 351, aad9189 (2016)

Published
2016
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7. Inflight Radiometric Calibration of New Horizons' Multispectral Visible Imaging Camera (MVIC)

Author

Howett, C. J. A., Parker, A. H., Olkin, C. B., Reuter, D. C., Ennico, K., Grundy, W. M, Graps, A. L., Harrison, K. P., Throop, H. B., Buie, M. W., Lovering, J. R., Porter, S. B., Weaver, H. A., Young, L. A., Stern, S. A., Beyer, R. A., Binzell, R. P., Buratti, B. J., Cheng, A. F., Cook, J. C., Cruikshank, D. P., Ore, C. M. Dalle, Earle, A. M., Jennings, D. E., Linscott, I. R., Lunsford, A. W., Parker, J. Wm., Phillippe, S., Protopapa, S., Quirico, E., Schenk, P. M., Schmitt, B., Singer, K. N., Spencer, J. R., Stansberry, J. A., Tsang, C. C. C., Weigle II, G. E., and Verbiscer, A. J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

We discuss two semi-independent calibration techniques used to determine the in-flight radiometric calibration for the New Horizons' Multi-spectral Visible Imaging Camera (MVIC). The first calibration technique compares the observed stellar flux to modeled values. The difference between the two provides a calibration factor that allows the observed flux to be adjusted to the expected levels for all observations, for each detector. The second calibration technique is a channel-wise relative radiometric calibration for MVIC's blue, near-infrared and methane color channels using observations of Charon and scaling from the red channel stellar calibration. Both calibration techniques produce very similar results (better than 7% agreement), providing strong validation for the techniques used. Since the stellar calibration can be performed without a color target in the field of view and covers all of MVIC's detectors, this calibration was used to provide the radiometric keywords delivered by the New Horizons project to the Planetary Data System (PDS). These keywords allow each observation to be converted from counts to physical units; a description of how these keywords were generated is included. Finally, mitigation techniques adopted for the gain drift observed in the near-infrared detector and one of the panchromatic framing cameras is also discussed.

Published
2016
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8. The Pluto system: Initial results from its exploration by New Horizons

Author

Stern, S. A., Bagenal, F., Ennico, K., Gladstone, G. R., Grundy, W. M., McKinnon, W. B., Moore, J. M., Olkin, C. B., Spencer, J. R., Weaver, H. A., Young, L. A., Andert, T., Andrews, J., Banks, M., Bauer, B., Bauman, J., Barnouin, O. S., Bedini, P., Beisser, K., Beyer, R. A., Bhaskaran, S., Binzel, R. P., Birath, E., Bird, M., Bogan, D. J., Bowman, A., Bray, V. J., Brozovic, M., Bryan, C., Buckley, M. R., Buie, M. W., Buratti, B. J., Bushman, S. S., Calloway, A., Carcich, B., Cheng, A. F., Conard, S., Conrad, C. A., Cook, J. C., Cruikshank, D. P., Custodio, O. S., Ore, C. M. Dalle, Deboy, C., Dischner, Z. J. B., Dumont, P., Earle, A. M., Elliott, H. A., Ercol, J., Ernst, C. M., Finley, T., Flanigan, S. H., Fountain, G., Freeze, M. J., Greathouse, T., Green, J. L., Guo, Y., Hahn, M., Hamilton, D. P., Hamilton, S. A., Hanley, J., Harch, A., Hart, H. M., Hersman, C. B., Hill, A., Hill, M. E., Hinson, D. P., Holdridge, M. E., Horanyi, M., Howard, A. D., Howett, C. J. A., Jackman, C., Jacobson, R. A., Jennings, D. E., Kammer, J. A., Kang, H. K., Kaufmann, D. E., Kollmann, P., Krimigis, S. M., Kusnierkiewicz, D., Lauer, T. R., Lee, J. E., Lindstrom, K. L., Linscott, I. R., Lisse, C. M., Lunsford, A. W., Mallder, V. A., Martin, N., McComas, D. J., McNutt Jr., R. L., Mehoke, D., Mehoke, T., Melin, E. D., Mutchler, M., Nelson, D., Nimmo, F., Nunez, J. I., Ocampo, A., Owen, W. M., Paetzold, M., Page, B., Parker, A. H., Parker, J. W., Pelletier, F., Peterson, J., Pinkine, N., Piquette, M., Porter, S. B., Protopapa, S., Redfern, J., Reitsema, H. J., Reuter, D. C., Roberts, J. H., Robbins, S. J., Rogers, G., Rose, D., Runyon, K., Retherford, K. D., Ryschkewitsch, M. G., Schenk, P., Schindhelm, R., Sepan, B., Showalter, M. R., Singer, K. N., Soluri, M., Stanbridge, D., Steffl, A. J., Strobel, D. F., Stryk, T., Summers, M. E., Szalay, J. R., Tapley, M., Taylor, A., Taylor, H., Throop, H. B., Tsang, C. C. C., Tyler, G. L., Umurhan, O. M., Verbiscer, A. J., Versteeg, M. H., Vincent, M., Webbert, R., Weidner, S., Weigle II, G. E., White, O. L., Whittenburg, K., Williams, B. G., Williams, K., Williams, S., Woods, W. W., Zangari, A. M., and Zirnstein, E.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The Pluto system was recently explored by NASA's New Horizons spacecraft, making closest approach on 14 July 2015. Pluto's surface displays diverse landforms, terrain ages, albedos, colors, and composition gradients. Evidence is found for a water-ice crust, geologically young surface units, surface ice convection, wind streaks, volatile transport, and glacial flow. Pluto's atmosphere is highly extended, with trace hydrocarbons, a global haze layer, and a surface pressure near 10 microbars. Pluto's diverse surface geology and long-term activity raise fundamental questions about how small planets remain active many billions of years after formation. Pluto's large moon Charon displays tectonics and evidence for a heterogeneous crustal composition, its north pole displays puzzling dark terrain. Small satellites Hydra and Nix have higher albedos than expected., Comment: 8 pages - Initial Science paper from NASA's New Horizons Pluto Encounter

Published
2015
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9. Io's Atmospheric Response to Eclipse: UV Aurorae Observations

Author

Retherford, K. D., Spencer, J. R., Stern, S. A., Saur, J., Strobel, D. F., Steffl, A. J., Gladstone, G. R., Weaver, H. A., Cheng, A. F., Parker, J. Wm., Slater, D. C., Versteeg, M. H., Davis, M. W., Bagenal, F., Throop, H. B., Lopes, R. M. C., Reuter, D. C., Lunsford, A., Conard, S. J., Young, L. A., and Moore, J. M.

Published
2007
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10. New Horizons Mapping of Europa and Ganymede

Author

Grundy, W. M., Buratti, B. J., Cheng, A. F., Emery, J. P., Lunsford, A., McKinnon, W. B., Moore, J. M., Newman, S. F., Olkin, C. B., Reuter, D. C., Schenk, P. M., Spencer, J. R., Stern, S. A., Throop, H. B., and Weaver, H. A.

Published
2007
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11. PLANETARY SCIENCE: Surface compositions across Pluto and Charon

Author

Grundy, W. M., Binzel, R. P., Buratti, B. J., Cook, J. C., Cruikshank, D. P., Dalle Ore, C. M., Earle, A. M., Ennico, K., Howett, C. J.A., Lunsford, A. W., Olkin, C. B., Parker, A. H., Philippe, S., Protopapa, S., Quirico, E., Reuter, D. C., Schmitt, B., Singer, K. N., Verbiscer, A. J., Beyer, R. A., Buie, M. W., Cheng, A. F., Jennings, D. E., Linscott, I. R., Parker, J. Wm., Schenk, P. M., Spencer, J. R., Stansberry, J. A., Stern, S. A., Throop, H. B., Tsang, C. C.C., Weaver, H. A., Weigle, G. E., II, and Young, L. A.

Published
2016
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12. PLANETARY SCIENCE: The Pluto system: Initial results from its exploration by New Horizons

Author

Stern, S. A., Bagenal, F., Ennico, K., Gladstone, G. R., Grundy, W. M., McKinnon, W. B., Moore, J. M., Olkin, C. B., Spencer, J. R., Weaver, H. A., Young, L. A., Andert, T., Andrews, J., Banks, M., Bauer, B., Bauman, J., Barnouin, O. S., Bedini, P., Beisser, K., Beyer, R. A., Bhaskaran, S., Binzel, R. P., Birath, E., Bird, M., Bogan, D. J., Bowman, A., Bray, V. J., Brozovic, M., Bryan, C., Buckley, M. R., Buie, M. W., Buratti, B. J., Bushman, S. S., Calloway, A., Carcich, B., Cheng, A. F., Conard, S., Conrad, C. A., Cook, J. C., Cruikshank, D. P., Custodio, O. S., Ore, Dalle C. M., Deboy, C., Dischner, Z. J. B., Dumont, P., Earle, A M., Elliott, H. A, Ercol, J., Ernst, C. M., Finley, T., Flanigan, S. H., Fountain, G., Freeze, M. J., Greathouse, T., Green, J. L., Guo, Y., Hahn, M., Hamilton, D. P., Hamilton, S. A., Hanley, J., Harch, A., Hart, H. M., Hersman, C. B., Hill, A., Hill, M. E., Hinson, D. P., Holdridge, M. E., Horanyi, M., Howard, A. D., Howett, C. J. A., Jackman, C., Jacobson, R. A., Jennings, D. E., Kammer, J. A., Kang, H. K., Kaufmann, D. E., Kollmann, P., Krimigis, S. M., Kusnierkiewicz, D., Lauer, T. R., Lee, J. E., Lindstrom, K. L., Linscott, I. R., Lisse, C. M., Lunsford, A. W., Mallder, V. A., Martin, N., McComas, D. J., McNutt, R. L., Jr., Mehoke, D., Mehoke, T., Melin, E. D., Mutchler, M., Nelson, D., Nimmo, F., Nunez, J. I., Ocampo, A., Owen, W. M., Paetzold, M., Page, B., Parker, A. H., Parker, J. W., Pelletier, F., Peterson, J., Pinkine, N., Piquette, M., Porter, S. B., Protopapa, S., Redfern, J., Reitsema, H. J., Reuter, D. C., Roberts, J. H., Bobbins, S. J., Rogers, G., Rose, D., Runyon, K., Retherford, K. D., Ryschkewitsch, M. G., Schenk, P., Schindhelm, E., Sepan, B., Showalter, M. R., Singer, K. N., Soluri, M., Stanbridge, D., Steffl, A. J., Strobel, D. F., Stryk, T., Summers, M. E., Szalay, J. R., Tapley, M., Taylor, A., Taylor, H., Throop, H. B., Tsang, C. C. C., Tyler, G. L., Umurhan, O. M., Verbiscer, A. J., Versteeg, M. H., Vincent, M., Webbert, R., Weidner, S., Weigle, G. E., II, White, O. L., Whittenburg, K., Williams, B. G., Williams, K., Williams, S., Woods, W. W., Zangari, A. M., and Zirnstein, E.

Published
2015
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13. Influence of Solar Disturbances on Galactic Cosmic Rays in the Solar Wind, Heliosheath, and Local Interstellar Medium: Advanced Composition Explorer, New Horizons, and Voyager Observations

Author

Hill, M. E., primary, Allen, R. C., additional, Kollmann, P., additional, Brown, L. E., additional, Decker, R. B., additional, McNutt, R. L., additional, Krimigis, S. M., additional, Andrews, G. B., additional, Bagenal, F., additional, Clark, G., additional, Elliott, H. A., additional, Jaskulek, S. E., additional, Kusterer, M. B., additional, Leske, R. A., additional, Lisse, C. M., additional, Mewaldt, R. A., additional, Nelson, K. S., additional, Richardson, J. D., additional, Romeo, G., additional, Salazar, N. A., additional, Vandegriff, J. D., additional, Bernardoni, E. A., additional, Gladstone, G. R., additional, Horanyi, M., additional, Linscott, I. R., additional, Singer, K. N., additional, Steffl, A. J., additional, Summers, M. E., additional, Throop, H. B., additional, Young, L. A., additional, Olkin, C. B., additional, Parker, J. Wm., additional, Spencer, J. R., additional, Stern, S. A., additional, Verbiscer, A. J., additional, and Weaver, H. A., additional

Published
2020
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14. The geology and geophysics of Kuiper Belt object (486958) Arrokoth

Author

Spencer, J. R., primary, Stern, S. A., additional, Moore, J. M., additional, Weaver, H. A., additional, Singer, K. N., additional, Olkin, C. B, additional, Verbiscer, A. J., additional, McKinnon, W. B., additional, Parker, J. Wm., additional, Beyer, R. A., additional, Keane, J. T., additional, Lauer, T. R., additional, Porter, S. B., additional, White, O. L., additional, Buratti, B. J., additional, El-Maarry, M. R., additional, Lisse, C. M., additional, Parker, A. H., additional, Throop, H. B., additional, Robbins, S. J., additional, Umurhan, O. M., additional, Binzel, R. P., additional, Britt, D. T., additional, Buie, M. W., additional, Cheng, A. F., additional, Cruikshank, D. P., additional, Elliott, H. A., additional, Gladstone, G. R., additional, Grundy, W. M., additional, Hill, M. E., additional, Horanyi, M., additional, Jennings, D. E., additional, Kavelaars, J. J., additional, Linscott, I. R., additional, McComas, D. J., additional, McNutt, R. L., additional, Protopapa, S., additional, Reuter, D. C., additional, Schenk, P. M., additional, Showalter, M. R., additional, Young, L. A., additional, Zangari, A. M., additional, Abedin, A. Y., additional, Beddingfield, C. B., additional, Benecchi, S. D., additional, Bernardoni, E., additional, Bierson, C. J., additional, Borncamp, D., additional, Bray, V. J., additional, Chaikin, A. L., additional, Dhingra, R. D., additional, Fuentes, C., additional, Fuse, T., additional, Gay, P. L, additional, Gwyn, S. D. J., additional, Hamilton, D. P., additional, Hofgartner, J. D., additional, Holman, M. J., additional, Howard, A. D., additional, Howett, C. J. A., additional, Karoji, H., additional, Kaufmann, D. E., additional, Kinczyk, M., additional, May, B. H., additional, Mountain, M., additional, Pätzold, M., additional, Petit, J. M., additional, Piquette, M. R., additional, Reid, I. N., additional, Reitsema, H. J., additional, Runyon, K. D., additional, Sheppard, S. S., additional, Stansberry, J. A., additional, Stryk, T., additional, Tanga, P., additional, Tholen, D. J., additional, Trilling, D. E., additional, and Wasserman, L. H., additional

Published
2020
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15. The formation of Charons red poles from seasonally cold-trapped volatiles

Author

Grundy, W. M., Cruikshank, D. P., Gladstone, G. R., Howett, C. J. A., Lauer, T. R., Spencer, J. R., Summers, M. E., Buie, M. W., Earle, A. M., Ennico, K., Parker, J. Wm., Porter, S. B., Singer, K. N., Stern, S. A., Verbiscer, A. J., Beyer, R. A., Binzel, R. P., Buratti, B. J., Cook, J. C., Dalle Ore, C. M., Olkin, C. B., Parker, A. H., Protopapa, S., Quirico, E., Retherford, K. D., Robbins, S. J., Schmitt, B., Stansberry, J. A., Umurhan, O. M., Weaver, H. A., Young, L. A., Zangari, A. M., Bray, V. J., Cheng, A. F., McKinnon, W. B., McNutt, R. L., Moore, J. M., Nimmo, F., Reuter, D. C., Schenk, P. M., Bagenal, F., Andert, T., Barnouin, O., Bird, M., Brozovi, M., Elliott, H. A., Greathouse, T. K., Hahn, M., Hamilton, D. P., Hill, M. E., Hinson, D. P., Hofgartner, J., Hornyi, M., Howard, A. D., Jennings, D. E., Kammer, J. A., Kollmann, P., Lavvas, P., Linscott, I. R., Lisse, C. M., Lunsford, A. W., McComas, D. J., McNutt Jr., R. L., Mutchler, M., Nunez, J. I., Paetzold, M., Wm. Parker, J., Philippe, S., Piquette, M., Reitsema, H. J., Roberts, J. H., Runyon, K., Schindhelm, E., Showalter, M. R., Steffl, A. J., Strobel, D. F., Stryk, T., Szalay, J. R., Throop, H. B., Tsang, C. C. C., Tyler, G. L., Versteeg, M. H., Weigle II, G. E., White, O. L., Woods, W. W., and Young, E. F.

Subjects
Charon (Satellite) -- Natural history -- Observations, Pluto (Dwarf planet) -- Natural history -- Observations, Planetary atmospheres -- Natural history -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): W. M. Grundy (corresponding author) [1]; D. P. Cruikshank [2]; G. R. Gladstone [3]; C. J. A. Howett [4]; T. R. Lauer [5]; J. R. Spencer [4]; M. E. [...]

Published
2016
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16. Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt object

Author

Stern, S. A., Weaver, H. A., Spencer, J. R., Olkin, C. B., Gladstone, G. R., Grundy, W. M., Moore, J. M., Cruikshank, D. P., Elliott, H. A., McKinnon, W. B., Parker, J. Wm., Verbiscer, A. J., Young, L. A., Aguilar, D. A., Albers, J. M., Andert, T., Andrews, J. P., Bagenal, F., Banks, M. E., Bauer, B. A., Bauman, J. A., Bechtold, K. E., Beddingfield, C. B., Behrooz, N., Beisser, K. B., Benecchi, S. D., Bernardoni, E., Beyer, R. A., Bhaskaran, S., Bierson, C. J., Binzel, R. P., Birath, E. M., Bird, M. K., Boone, D. R., Bowman, A. F., Bray, V. J., Britt, D. T., Brown, L. E., Buckley, M. R., Buie, M. W., Buratti, B. J., Burke, L. M., Bushman, S. S., Careich, B., Chaikin, A. L., Chavez, C. L., Cheng, A. F., Colwell, E. J., Conard, S. J., Conner, M. P., Conrad, C. A., Cook, J. C., Cooper, S. B., Custodio, O. S., Ore, C. M. Dalle, Deboy, C. C., Dharmavaram, P., Dhingra, R. D., Dunn, G. F., Earle, A. M., Egan, A. F., Eisig, J., El-Maarry, M. R., Engelbrecht, C., Enke, B. L., Ercol, C. J., Fattig, E. D., Ferrell, C. L., Finley, T. J., Firer, J., Fischetti, J., Folkner, W. M., Fosbury, M. N., Fountain, G. H., Freeze, J. M., Gabasova, L., Glaze, L. S., Green, J. L., Griffith, G. A., Guo, Y., Hahn, M., Hals, D. W., Hamilton, D. P., Hamilton, S. A., Hanley, J. J., Harch, A., Harmon, K. A., Hart, H. M., Hayes, J., Hersman, C. B., Hill, M. E., Hill, T. A., Hofgartner, J. D., Holdridge, M. E., Horanyi, M., Hosadurga, A., Howard, A. D., Howett, C. J. A., Jaskulek, S. E., Jennings, D. E., Jensen, J. R., Jones, M. R., Kang, H. K., Katz, D. J., Kaufmann, D. E., Kavelaars, J. J., Keane, J. T., Keleher, G. P., Kinczyk, M., Kochte, M. C., Kolmnann, P., Krimigis, S. M., Kruizinga, G. L., Kusnierkiewicz, D. Y., Lahr, M. S., Lauer, T. R., Lawrence, G. B., Lee, J. E., Lessac-Chenen, E. J., Linscott, I. R., Lisse, C. M., Lunsford, A. W., Mages, D. M., Mallder, V. A., Martin, N. P., May, B. H., McComas, D. J., MeNutt, R. L., Jr., Mehoke, D. S., Mehoke, T. S., Nelson, D. S., Nguyen, H. D., Nunez, J. I., Ocampo, A. C., Owen, W. M., Oxton, G. K., Parker, A. H., Patzold, M., Pelgrift, J. Y., Pelletier, F. J., Pineau, J. P., Piquette, M. R., Porter, S. B., Protopapa, S., Quirico, E., Redfern, J. A., Regiec, A. L., Reitsema, H. J., Reuter, D. C., Richardson, D. C., Riedel, J. E., Ritterbush, M. A., Robbins, S. J., Rodgers, D. J., Rogers, G. D., Rose, D. M., Rosendal, P. E., Runyon, K. D., Ryschkewitsch, M. G., Saina, M. M., Salinas, M. J., Schenk, P. M., Scherrer, J. R., Schlei, W. R., Schmitt, B., Schultz, D. J., Schurr, D. C., Scipioni, F., Sepan, R. L., Shelton, R. G., Showalter, M. R., Simon, M., Singer, K. N., Stahlheber, E. W., Stanbridge, D. R., Stansberry, J. A., Steffi, A. J., Strobel, D. F., Stothoff, M. M., Stryk, T., Stuart, J. M., Summers, M. E., Tapley, M. B., Taylor, A., Taylor, H. W., Tedford, R. M., Throop, H. B., Turner, L. S., Umurhan, O. M., Van Eck, J., Velez, D., Versteeg, M. H., Vincent, M. A., Webbert, R. W., Weidner, S. E., Ii, G. E. Weigle, Wendel, J. R., White, O. L., Whittenburg, K. E., Williams, B. G., Williams, K. E., Williams, S. P., Wimters, H. L., Zangari, A. M., Zurbuchen, T. H., Stern, S. A., Weaver, H. A., Spencer, J. R., Olkin, C. B., Gladstone, G. R., Grundy, W. M., Moore, J. M., Cruikshank, D. P., Elliott, H. A., McKinnon, W. B., Parker, J. Wm., Verbiscer, A. J., Young, L. A., Aguilar, D. A., Albers, J. M., Andert, T., Andrews, J. P., Bagenal, F., Banks, M. E., Bauer, B. A., Bauman, J. A., Bechtold, K. E., Beddingfield, C. B., Behrooz, N., Beisser, K. B., Benecchi, S. D., Bernardoni, E., Beyer, R. A., Bhaskaran, S., Bierson, C. J., Binzel, R. P., Birath, E. M., Bird, M. K., Boone, D. R., Bowman, A. F., Bray, V. J., Britt, D. T., Brown, L. E., Buckley, M. R., Buie, M. W., Buratti, B. J., Burke, L. M., Bushman, S. S., Careich, B., Chaikin, A. L., Chavez, C. L., Cheng, A. F., Colwell, E. J., Conard, S. J., Conner, M. P., Conrad, C. A., Cook, J. C., Cooper, S. B., Custodio, O. S., Ore, C. M. Dalle, Deboy, C. C., Dharmavaram, P., Dhingra, R. D., Dunn, G. F., Earle, A. M., Egan, A. F., Eisig, J., El-Maarry, M. R., Engelbrecht, C., Enke, B. L., Ercol, C. J., Fattig, E. D., Ferrell, C. L., Finley, T. J., Firer, J., Fischetti, J., Folkner, W. M., Fosbury, M. N., Fountain, G. H., Freeze, J. M., Gabasova, L., Glaze, L. S., Green, J. L., Griffith, G. A., Guo, Y., Hahn, M., Hals, D. W., Hamilton, D. P., Hamilton, S. A., Hanley, J. J., Harch, A., Harmon, K. A., Hart, H. M., Hayes, J., Hersman, C. B., Hill, M. E., Hill, T. A., Hofgartner, J. D., Holdridge, M. E., Horanyi, M., Hosadurga, A., Howard, A. D., Howett, C. J. A., Jaskulek, S. E., Jennings, D. E., Jensen, J. R., Jones, M. R., Kang, H. K., Katz, D. J., Kaufmann, D. E., Kavelaars, J. J., Keane, J. T., Keleher, G. P., Kinczyk, M., Kochte, M. C., Kolmnann, P., Krimigis, S. M., Kruizinga, G. L., Kusnierkiewicz, D. Y., Lahr, M. S., Lauer, T. R., Lawrence, G. B., Lee, J. E., Lessac-Chenen, E. J., Linscott, I. R., Lisse, C. M., Lunsford, A. W., Mages, D. M., Mallder, V. A., Martin, N. P., May, B. H., McComas, D. J., MeNutt, R. L., Jr., Mehoke, D. S., Mehoke, T. S., Nelson, D. S., Nguyen, H. D., Nunez, J. I., Ocampo, A. C., Owen, W. M., Oxton, G. K., Parker, A. H., Patzold, M., Pelgrift, J. Y., Pelletier, F. J., Pineau, J. P., Piquette, M. R., Porter, S. B., Protopapa, S., Quirico, E., Redfern, J. A., Regiec, A. L., Reitsema, H. J., Reuter, D. C., Richardson, D. C., Riedel, J. E., Ritterbush, M. A., Robbins, S. J., Rodgers, D. J., Rogers, G. D., Rose, D. M., Rosendal, P. E., Runyon, K. D., Ryschkewitsch, M. G., Saina, M. M., Salinas, M. J., Schenk, P. M., Scherrer, J. R., Schlei, W. R., Schmitt, B., Schultz, D. J., Schurr, D. C., Scipioni, F., Sepan, R. L., Shelton, R. G., Showalter, M. R., Simon, M., Singer, K. N., Stahlheber, E. W., Stanbridge, D. R., Stansberry, J. A., Steffi, A. J., Strobel, D. F., Stothoff, M. M., Stryk, T., Stuart, J. M., Summers, M. E., Tapley, M. B., Taylor, A., Taylor, H. W., Tedford, R. M., Throop, H. B., Turner, L. S., Umurhan, O. M., Van Eck, J., Velez, D., Versteeg, M. H., Vincent, M. A., Webbert, R. W., Weidner, S. E., Ii, G. E. Weigle, Wendel, J. R., White, O. L., Whittenburg, K. E., Williams, B. G., Williams, K. E., Williams, S. P., Wimters, H. L., Zangari, A. M., and Zurbuchen, T. H.

Abstract

The Kuiper Belt is a distant region of the outer Solar System. On 1 January 2019, the New Horizons spacecraft flew close to (486958) 2014 MU69, a cold classical Kuiper Belt object approximately 30 kilometers in diameter. Such objects have never been substantially heated by the Sun and are therefore well preserved since their formation. We describe initial results from these encounter observations. MU69 is a bilobed contact binary with a flattened shape, discrete geological units, and noticeable albedo heterogeneity. However, there is little surface color or compositional heterogeneity. No evidence for satellites, rings or other dust structures, a gas coma, or solar wind interactions was detected. MU69's origin appears consistent with pebble cloud collapse followed by a low-velocity merger of its two lobes.

Published
2019

17. Initial results from the New Horizons exploration of 2014 MU69, a small Kuiper Belt object

Author

Stern, S. A., primary, Weaver, H. A., additional, Spencer, J. R., additional, Olkin, C. B., additional, Gladstone, G. R., additional, Grundy, W. M., additional, Moore, J. M., additional, Cruikshank, D. P., additional, Elliott, H. A., additional, McKinnon, W. B., additional, Parker, J. Wm., additional, Verbiscer, A. J., additional, Young, L. A., additional, Aguilar, D. A., additional, Albers, J. M., additional, Andert, T., additional, Andrews, J. P., additional, Bagenal, F., additional, Banks, M. E., additional, Bauer, B. A., additional, Bauman, J. A., additional, Bechtold, K. E., additional, Beddingfield, C. B., additional, Behrooz, N., additional, Beisser, K. B., additional, Benecchi, S. D., additional, Bernardoni, E., additional, Beyer, R. A., additional, Bhaskaran, S., additional, Bierson, C. J., additional, Binzel, R. P., additional, Birath, E. M., additional, Bird, M. K., additional, Boone, D. R., additional, Bowman, A. F., additional, Bray, V. J., additional, Britt, D. T., additional, Brown, L. E., additional, Buckley, M. R., additional, Buie, M. W., additional, Buratti, B. J., additional, Burke, L. M., additional, Bushman, S. S., additional, Carcich, B., additional, Chaikin, A. L., additional, Chavez, C. L., additional, Cheng, A. F., additional, Colwell, E. J., additional, Conard, S. J., additional, Conner, M. P., additional, Conrad, C. A., additional, Cook, J. C., additional, Cooper, S. B., additional, Custodio, O. S., additional, Dalle Ore, C. M., additional, Deboy, C. C., additional, Dharmavaram, P., additional, Dhingra, R. D., additional, Dunn, G. F., additional, Earle, A. M., additional, Egan, A. F., additional, Eisig, J., additional, El-Maarry, M. R., additional, Engelbrecht, C., additional, Enke, B. L., additional, Ercol, C. J., additional, Fattig, E. D., additional, Ferrell, C. L., additional, Finley, T. J., additional, Firer, J., additional, Fischetti, J., additional, Folkner, W. M., additional, Fosbury, M. N., additional, Fountain, G. H., additional, Freeze, J. M., additional, Gabasova, L., additional, Glaze, L. S., additional, Green, J. L., additional, Griffith, G. A., additional, Guo, Y., additional, Hahn, M., additional, Hals, D. W., additional, Hamilton, D. P., additional, Hamilton, S. A., additional, Hanley, J. J., additional, Harch, A., additional, Harmon, K. A., additional, Hart, H. M., additional, Hayes, J., additional, Hersman, C. B., additional, Hill, M. E., additional, Hill, T. A., additional, Hofgartner, J. D., additional, Holdridge, M. E., additional, Horányi, M., additional, Hosadurga, A., additional, Howard, A. D., additional, Howett, C. J. A., additional, Jaskulek, S. E., additional, Jennings, D. E., additional, Jensen, J. R., additional, Jones, M. R., additional, Kang, H. K., additional, Katz, D. J., additional, Kaufmann, D. E., additional, Kavelaars, J. J., additional, Keane, J. T., additional, Keleher, G. P., additional, Kinczyk, M., additional, Kochte, M. C., additional, Kollmann, P., additional, Krimigis, S. M., additional, Kruizinga, G. L., additional, Kusnierkiewicz, D. Y., additional, Lahr, M. S., additional, Lauer, T. R., additional, Lawrence, G. B., additional, Lee, J. E., additional, Lessac-Chenen, E. J., additional, Linscott, I. R., additional, Lisse, C. M., additional, Lunsford, A. W., additional, Mages, D. M., additional, Mallder, V. A., additional, Martin, N. P., additional, May, B. H., additional, McComas, D. J., additional, McNutt, R. L., additional, Mehoke, D. S., additional, Mehoke, T. S., additional, Nelson, D. S., additional, Nguyen, H. D., additional, Núñez, J. I., additional, Ocampo, A. C., additional, Owen, W. M., additional, Oxton, G. K., additional, Parker, A. H., additional, Pätzold, M., additional, Pelgrift, J. Y., additional, Pelletier, F. J., additional, Pineau, J. P., additional, Piquette, M. R., additional, Porter, S. B., additional, Protopapa, S., additional, Quirico, E., additional, Redfern, J. A., additional, Regiec, A. L., additional, Reitsema, H. J., additional, Reuter, D. C., additional, Richardson, D. C., additional, Riedel, J. E., additional, Ritterbush, M. A., additional, Robbins, S. J., additional, Rodgers, D. J., additional, Rogers, G. D., additional, Rose, D. M., additional, Rosendall, P. E., additional, Runyon, K. D., additional, Ryschkewitsch, M. G., additional, Saina, M. M., additional, Salinas, M. J., additional, Schenk, P. M., additional, Scherrer, J. R., additional, Schlei, W. R., additional, Schmitt, B., additional, Schultz, D. J., additional, Schurr, D. C., additional, Scipioni, F., additional, Sepan, R. L., additional, Shelton, R. G., additional, Showalter, M. R., additional, Simon, M., additional, Singer, K. N., additional, Stahlheber, E. W., additional, Stanbridge, D. R., additional, Stansberry, J. A., additional, Steffl, A. J., additional, Strobel, D. F., additional, Stothoff, M. M., additional, Stryk, T., additional, Stuart, J. R., additional, Summers, M. E., additional, Tapley, M. B., additional, Taylor, A., additional, Taylor, H. W., additional, Tedford, R. M., additional, Throop, H. B., additional, Turner, L. S., additional, Umurhan, O. M., additional, Van Eck, J., additional, Velez, D., additional, Versteeg, M. H., additional, Vincent, M. A., additional, Webbert, R. W., additional, Weidner, S. E., additional, Weigle, G. E., additional, Wendel, J. R., additional, White, O. L., additional, Whittenburg, K. E., additional, Williams, B. G., additional, Williams, K. E., additional, Williams, S. P., additional, Winters, H. L., additional, Zangari, A. M., additional, and Zurbuchen, T. H., additional

Published
2019
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18. The Pluto system: Initial results from its exploration by New Horizons

Author

Stern, S. A., primary, Bagenal, F., additional, Ennico, K., additional, Gladstone, G. R., additional, Grundy, W. M., additional, McKinnon, W. B., additional, Moore, J. M., additional, Olkin, C. B., additional, Spencer, J. R., additional, Weaver, H. A., additional, Young, L. A., additional, Andert, T., additional, Andrews, J., additional, Banks, M., additional, Bauer, B., additional, Bauman, J., additional, Barnouin, O. S., additional, Bedini, P., additional, Beisser, K., additional, Beyer, R. A., additional, Bhaskaran, S., additional, Binzel, R. P., additional, Birath, E., additional, Bird, M., additional, Bogan, D. J., additional, Bowman, A., additional, Bray, V. J., additional, Brozovic, M., additional, Bryan, C., additional, Buckley, M. R., additional, Buie, M. W., additional, Buratti, B. J., additional, Bushman, S. S., additional, Calloway, A., additional, Carcich, B., additional, Cheng, A. F., additional, Conard, S., additional, Conrad, C. A., additional, Cook, J. C., additional, Cruikshank, D. P., additional, Custodio, O. S., additional, Dalle Ore, C. M., additional, Deboy, C., additional, Dischner, Z. J. B., additional, Dumont, P., additional, Earle, A. M., additional, Elliott, H. A., additional, Ercol, J., additional, Ernst, C. M., additional, Finley, T., additional, Flanigan, S. H., additional, Fountain, G., additional, Freeze, M. J., additional, Greathouse, T., additional, Green, J. L., additional, Guo, Y., additional, Hahn, M., additional, Hamilton, D. P., additional, Hamilton, S. A., additional, Hanley, J., additional, Harch, A., additional, Hart, H. M., additional, Hersman, C. B., additional, Hill, A., additional, Hill, M. E., additional, Hinson, D. P., additional, Holdridge, M. E., additional, Horanyi, M., additional, Howard, A. D., additional, Howett, C. J. A., additional, Jackman, C., additional, Jacobson, R. A., additional, Jennings, D. E., additional, Kammer, J. A., additional, Kang, H. K., additional, Kaufmann, D. E., additional, Kollmann, P., additional, Krimigis, S. M., additional, Kusnierkiewicz, D., additional, Lauer, T. R., additional, Lee, J. E., additional, Lindstrom, K. L., additional, Linscott, I. R., additional, Lisse, C. M., additional, Lunsford, A. W., additional, Mallder, V. A., additional, Martin, N., additional, McComas, D. J., additional, McNutt, R. L., additional, Mehoke, D., additional, Mehoke, T., additional, Melin, E. D., additional, Mutchler, M., additional, Nelson, D., additional, Nimmo, F., additional, Nunez, J. I., additional, Ocampo, A., additional, Owen, W. M., additional, Paetzold, M., additional, Page, B., additional, Parker, A. H., additional, Parker, J. W., additional, Pelletier, F., additional, Peterson, J., additional, Pinkine, N., additional, Piquette, M., additional, Porter, S. B., additional, Protopapa, S., additional, Redfern, J., additional, Reitsema, H. J., additional, Reuter, D. C., additional, Roberts, J. H., additional, Robbins, S. J., additional, Rogers, G., additional, Rose, D., additional, Runyon, K., additional, Retherford, K. D., additional, Ryschkewitsch, M. G., additional, Schenk, P., additional, Schindhelm, E., additional, Sepan, B., additional, Showalter, M. R., additional, Singer, K. N., additional, Soluri, M., additional, Stanbridge, D., additional, Steffl, A. J., additional, Strobel, D. F., additional, Stryk, T., additional, Summers, M. E., additional, Szalay, J. R., additional, Tapley, M., additional, Taylor, A., additional, Taylor, H., additional, Throop, H. B., additional, Tsang, C. C. C., additional, Tyler, G. L., additional, Umurhan, O. M., additional, Verbiscer, A. J., additional, Versteeg, M. H., additional, Vincent, M., additional, Webbert, R., additional, Weidner, S., additional, Weigle, G. E., additional, White, O. L., additional, Whittenburg, K., additional, Williams, B. G., additional, Williams, K., additional, Williams, S., additional, Woods, W. W., additional, Zangari, A. M., additional, and Zirnstein, E., additional

Published
2015
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19. The Rings of Jupiter

Author

Pater, I. De, primary, Hamilton, D. P., additional, Showalter, M. R., additional, Throop, H. B., additional, and Burns, J. A., additional

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21. Initial results from the New Horizons exploration of 2014 MU 69 , a small Kuiper Belt object.

Author

Stern SA, Weaver HA, Spencer JR, Olkin CB, Gladstone GR, Grundy WM, Moore JM, Cruikshank DP, Elliott HA, McKinnon WB, Parker JW, Verbiscer AJ, Young LA, Aguilar DA, Albers JM, Andert T, Andrews JP, Bagenal F, Banks ME, Bauer BA, Bauman JA, Bechtold KE, Beddingfield CB, Behrooz N, Beisser KB, Benecchi SD, Bernardoni E, Beyer RA, Bhaskaran S, Bierson CJ, Binzel RP, Birath EM, Bird MK, Boone DR, Bowman AF, Bray VJ, Britt DT, Brown LE, Buckley MR, Buie MW, Buratti BJ, Burke LM, Bushman SS, Carcich B, Chaikin AL, Chavez CL, Cheng AF, Colwell EJ, Conard SJ, Conner MP, Conrad CA, Cook JC, Cooper SB, Custodio OS, Dalle Ore CM, Deboy CC, Dharmavaram P, Dhingra RD, Dunn GF, Earle AM, Egan AF, Eisig J, El-Maarry MR, Engelbrecht C, Enke BL, Ercol CJ, Fattig ED, Ferrell CL, Finley TJ, Firer J, Fischetti J, Folkner WM, Fosbury MN, Fountain GH, Freeze JM, Gabasova L, Glaze LS, Green JL, Griffith GA, Guo Y, Hahn M, Hals DW, Hamilton DP, Hamilton SA, Hanley JJ, Harch A, Harmon KA, Hart HM, Hayes J, Hersman CB, Hill ME, Hill TA, Hofgartner JD, Holdridge ME, Horányi M, Hosadurga A, Howard AD, Howett CJA, Jaskulek SE, Jennings DE, Jensen JR, Jones MR, Kang HK, Katz DJ, Kaufmann DE, Kavelaars JJ, Keane JT, Keleher GP, Kinczyk M, Kochte MC, Kollmann P, Krimigis SM, Kruizinga GL, Kusnierkiewicz DY, Lahr MS, Lauer TR, Lawrence GB, Lee JE, Lessac-Chenen EJ, Linscott IR, Lisse CM, Lunsford AW, Mages DM, Mallder VA, Martin NP, May BH, McComas DJ, McNutt RL Jr, Mehoke DS, Mehoke TS, Nelson DS, Nguyen HD, Núñez JI, Ocampo AC, Owen WM, Oxton GK, Parker AH, Pätzold M, Pelgrift JY, Pelletier FJ, Pineau JP, Piquette MR, Porter SB, Protopapa S, Quirico E, Redfern JA, Regiec AL, Reitsema HJ, Reuter DC, Richardson DC, Riedel JE, Ritterbush MA, Robbins SJ, Rodgers DJ, Rogers GD, Rose DM, Rosendall PE, Runyon KD, Ryschkewitsch MG, Saina MM, Salinas MJ, Schenk PM, Scherrer JR, Schlei WR, Schmitt B, Schultz DJ, Schurr DC, Scipioni F, Sepan RL, Shelton RG, Showalter MR, Simon M, Singer KN, Stahlheber EW, Stanbridge DR, Stansberry JA, Steffl AJ, Strobel DF, Stothoff MM, Stryk T, Stuart JR, Summers ME, Tapley MB, Taylor A, Taylor HW, Tedford RM, Throop HB, Turner LS, Umurhan OM, Van Eck J, Velez D, Versteeg MH, Vincent MA, Webbert RW, Weidner SE, Weigle GE 2nd, Wendel JR, White OL, Whittenburg KE, Williams BG, Williams KE, Williams SP, Winters HL, Zangari AM, and Zurbuchen TH

Abstract

The Kuiper Belt is a distant region of the outer Solar System. On 1 January 2019, the New Horizons spacecraft flew close to (486958) 2014 MU 69 , a cold classical Kuiper Belt object approximately 30 kilometers in diameter. Such objects have never been substantially heated by the Sun and are therefore well preserved since their formation. We describe initial results from these encounter observations. MU 69 is a bilobed contact binary with a flattened shape, discrete geological units, and noticeable albedo heterogeneity. However, there is little surface color or compositional heterogeneity. No evidence for satellites, rings or other dust structures, a gas coma, or solar wind interactions was detected. MU 69 's origin appears consistent with pebble cloud collapse followed by a low-velocity merger of its two lobes., (Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)

Published
2019
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22. Evidence for dust grain growth in young circumstellar disks.

Author

Throop HB, Bally J, Esposito LW, and McCaughrean MJ

Subjects
Astronomical Phenomena, Astronomy, Cosmic Dust, Evolution, Planetary
Abstract

Hundreds of circumstellar disks in the Orion nebula are being rapidly destroyed by the intense ultraviolet radiation produced by nearby bright stars. These young, million-year-old disks may not survive long enough to form planetary systems. Nevertheless, the first stage of planet formation-the growth of dust grains into larger particles-may have begun in these systems. Observational evidence for these large particles in Orion's disks is presented. A model of grain evolution in externally irradiated protoplanetary disks is developed and predicts rapid particle size evolution and sharp outer disk boundaries. We discuss implications for the formation rates of planetary systems.

Published
2001
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