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17 results on '"Skiff, B. A."'

1. A satellite orbit drift in binary near-Earth asteroids (66391) 1999 KW4 and (88710) 2001 SL9 — Indication of the BYORP effect

Author

Scheirich, P., Pravec, P., Kušnirák, P., Hornoch, K., McMahon, J., Scheeres, D.J., Čapek, D., Pray, D.P., Kučáková, H., Galád, A., Vraštil, J., Krugly, Yu N., Moskovitz, N., Avner, L.D., Skiff, B., McMillan, R.S., Larsen, J.A., Brucker, M.J., Tubbiolo, A.F., Cooney, W.R., Gross, J., Terrell, D., Burkhonov, O., Ergashev, K.E., Ehgamberdiev, Sh.A., Fatka, P., Durkee, R., Schunova, E. Lilly, Inasaridze, R. Ya, Ayvazian, V.R., Kapanadze, G., Gaftonyuk, N.M., Sanchez, J.A., Reddy, V., McGraw, L., Kelley, M.S., and Molotov, I.E.

Published
2021
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3. Asteroid pairs: A complex picture

Author

Pravec, P., Fatka, P., Vokrouhlický, D., Scheirich, P., Ďurech, J., Scheeres, D.J., Kušnirák, P., Hornoch, K., Galád, A., Pray, D.P., Krugly, Yu. N., Burkhonov, O., Ehgamberdiev, Sh. A., Pollock, J., Moskovitz, N., Thirouin, A., Ortiz, J.L., Morales, N., Husárik, M., Inasaridze, R. Ya., Oey, J., Polishook, D., Hanuš, J., Kučáková, H., Vraštil, J., Világi, J., Gajdoš, Š., Kornoš, L., Vereš, P., Gaftonyuk, N.M., Hromakina, T., Sergeyev, A.V., Slyusarev, I.G., Ayvazian, V.R., Cooney, W.R., Gross, J., Terrell, D., Colas, F., Vachier, F., Slivan, S., Skiff, B., Marchis, F., Ergashev, K.E., Kim, D.-H., Aznar, A., Serra-Ricart, M., Behrend, R., Roy, R., Manzini, F., and Molotov, I.E.

Published
2019
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4. Blazar spectral variability as explained by a twisted inhomogeneous jet

Author

Raiteri, C. M., Villata, M., Acosta-Pulido, J. A., Agudo, I., Arkharov, A. A., Bachev, R., Baida, G. V., Benítez, E., Borman, G. A., Boschin, W., Bozhilov, V., Butuzova, M. S., Calcidese, P., Carnerero, M. I., Carosati, D., Casadio, C., Castro-Segura, N., Chen, W.-P., Damljanovic, G., DʼAmmando, F., Di Paola, A., Echevarría, J., Efimova, N. V., Ehgamberdiev, Sh. A., Espinosa, C., Fuentes, A., Giunta, A., Gómez, J. L., Grishina, T. S., Gurwell, M. A., Hiriart, D., Jermak, H., Jordan, B., Jorstad, S. G., Joshi, M., Kopatskaya, E. N., Kuratov, K., Kurtanidze, O. M., Kurtanidze, S. O., Lähteenmäki, A., Larionov, V. M., Larionova, E. G., Larionova, L. V., Lázaro, C., Lin, C. S., Malmrose, M. P., Marscher, A. P., Matsumoto, K., McBreen, B., Michel, R., Mihov, B., Minev, M., Mirzaqulov, D. O., Mokrushina, A. A., Molina, S. N., Moody, J. W., Morozova, D. A., Nazarov, S. V., Nikolashvili, M. G., Ohlert, J. M., Okhmat, D. N., Ovcharov, E., Pinna, F., Polakis, T. A., Protasio, C., Pursimo, T., Redondo-Lorenzo, F. J., Rizzi, N., Rodriguez-Coira, G., Sadakane, K., Sadun, A. C., Samal, M. R., Savchenko, S. S., Semkov, E., Skiff, B. A., Slavcheva-Mihova, L., Smith, P. S., Steele, I. A., Strigachev, A., Tammi, J., Thum, C., Tornikoski, M., Troitskaya, Yu. V., Troitsky, I. S., Vasilyev, A. A., and Vince, O.

Published
2017
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6. Photometry and model of near-Earth asteroid 2021 DW1 from one apparition

Author

Kwiatkowski, T., Koleńczuk, P., Kryszczynska, A., Oszkiewicz, D. A., Kamiński, K., Kamińska, M. K., Troianskyi, V., Skiff, B., Moskowitz, N., Kashuba, V., Kim, M.-J., Kim, T., Mottola, S., Santana-Ros, T., Kluwak, T., Buzzi, L., Bacci, P., Birtwhistle, P., Miles, R., Chatelain, J., and Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), shape modelling, Space and Planetary Science, Física Aplicada, photometric [Techniques], FOS: Physical sciences, Astronomy and Astrophysics, observational [Methods], individual: 2021 DW1 [Minor planets, asteroids], asteroids – photometric observations – period, spin axis, Astrophysics - Earth and Planetary Astrophysics
Abstract

On 4 March 2021 at 9 UTC a 30-m in diameter near-Earth asteroid 2021 DW1 passed the Earth at a distance of 570000 km, reaching the maximum brightness of V=14.6 mag. We observed it photometrically from 2 March, when it was visible at V=16.5 mag, until 7 March (V=18.2 mag). During that time 2021 DW1 swept a 170 degrees long arc in the northern sky, spanning solar phase angles in the range from 36 to 86 degrees. This made it an excellent target for physical characterisation, including spin axis and shape derivation. Convex inversion of the asteroid lightcurves gives a sidereal period of rotation P=0.013760 +/- 0.000001 h, and two solutions for the spin axis ecliptic coordinates: (A) lambda_1=57 +/- 10, beta_1=29 +/- 10, and (B) lambda_2=67 +/- 10, beta_2=-40 +/- 10. The magnitude-phase curve can be fitted with a standard H, G function with H=24.8 +/- 0.5 mag and an assumed G=0.24. The asteroid colour indices are g-i=0.79 +/- 0.01 mag, and i-z=0.01 +/- 0.02 mag which indicates an S taxonomic class, with an average geometric albedo p_V=0.23 +/- 0.02. The asteroid effective diameter, derived from H and p_V, is D=30 +/- 10 m. It was found that the inclination of the spin axis of 2021 DW1 is not perpendicular to the orbital plane (obliquity epsilon=54 +/- 10 or epsilon=123 +/- 10). More spin axes of VSAs should be determined to check, if 2021 DW1 is an exception or a typical case., 9 pages, 9 figures, submitted to A&A (version after revision)

Published
2021

7. A satellite orbit drift in binary near-Earth asteroids (66391) 1999 KW4 and (88710) 2001 SL9 -- Indication of the BYORP effect

Author

Scheirich, P., Pravec, P., Ku��nir��k, P., Hornoch, K., McMahon, J., Scheeres, D. J., ��apek, D., Pray, D. P., Ku����kov��, H., Gal��d, A., Vra��til, J., Krugly, Yu. N., Moskovitz, N., Avner, L. D., Skiff, B., McMillan, R. S., Larsen, J. A., Brucker, M. J., Tubbiolo, A. F., Cooney, W. R., Gross, J., Terrell, D., Burkhonov, O., Ergashev, K. E., Ehgamberdiev, Sh. A., Fatka, P., Durkee, R., Schunova, E. Lilly, Inasaridze, R. Ya., Ayvazian, V. R., Kapanadze, G., Gaftonyuk, N. M., Sanchez, J. A., Reddy, V., McGraw, L., Kelley, M. S., and Molotov, I. E.

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), FOS: Physical sciences, Astrophysics - Earth and Planetary Astrophysics
Abstract

We obtained thorough photometric observations of two binary near-Earth asteroids (66391) Moshup = 1999 KW4 and (88710) 2001 SL9 taken from 2000 to 2019 and derived physical and dynamical properties of the binary systems. We found that the data for 1999 KW4 are inconsistent with a constant orbital period and we obtained unique solution with a quadratic drift of the mean anomaly of the satellite of -0.65 +/- 0.16 deg/yr2 (all quoted uncertainties are 3sigma). This means that the semimajor axis of the mutual orbit of the components of this binary system increases in time with a mean rate of 1.2 +/- 0.3 cm/yr. The data for 2001 SL9 are also inconsistent with a constant orbital period and we obtained two solutions for the quadratic drift of the mean anomaly: 2.8 +/- 0.2 and 5.2 +/- 0.2 deg/yr2, implying that the semimajor axis of the mutual orbit of the components decreases in time with a mean rate of -2.8 +/- 0.2 or -5.1 +/- 0.2 cm/yr for the two solutions, respectively. The expanding orbit of 1999 KW4 may be explained by mutual tides interplaying with binary YORP (BYORP) effect (McMahon and Scheeres, 2010). However, a modeling of the BYORP drift using radar-derived shapes of the binary components predicted a much higher value of the orbital drift than the observed one. It suggests that either the radar-derived shape model of the secondary is inadequate for computing the BYORP effect, or the present theory of BYORP overestimates it. It is possible that the BYORP coefficient has instead an opposite sign than predicted; in that case, the system may be moving into an equilibrium between the BYORP and the tides. In the case of 2001 SL9, the BYORP effect is the only known physical mechanism that can cause the inward drift of its mutual orbit., 44 pages, 17 figures. Accepted for publication in Icarus journal

Published
2019

8. IC 1257: A New Globular Cluster in the Galactic Halo

Author

Harris, W. E, Phelps, R. L, Madore, B. F, Pevunova, O, Skiff, B. A, Crute, C, and Wilson, B

Subjects
Astronomy
Abstract

New CCD photometry of the faint, compact star cluster IC 1257 (L = 17? = +/- 15?obtained with the Palomar 5m telescope, reveals that it is a highly reddened globular cluster well beyond the Galactic center.

Published
1996

9. Some Insights on Solar Variability from Precision Stellar Astronomical Photometry

Author

Lockwood, G. W and Skiff, B. A

Subjects
Solar Physics
Abstract

At Lowell Observatory, precision photoelectric photometry was directed toward the study of solar variability and the variability of sun-like stars beginning in 1949 and continuing until now. The ubiquity and range of low-level variability, including some that appears to be cyclic, among solar-type stars shows that recent solar variability may be unusual only in its present restraint.

Published
1990

10. Observations of Comets

Author

Lehky M., Tes, L., Boattini A., Fagioli G., Mazzucato M., Dolfi F., Tombelli M., Forti G., Buzzi L, Naves R., Campas M., Hasubick W., Rinner C., Reina E., Ligustri R., da Rio D., Michels H., Kadota K., Wakuda S, Herald D., McAndrew S. G., Rodriguez D., Christie G. W., Natusch T., Donato L., Gonano V., Guido E., Sostero G., Josa R., Brown, M., Bambery, R., Lawrence, K., Hicks, M., Helin, E., Thicksten, R., Gladman, B., Vanlaerhoven, C., Tucker, R., Bressi, T. H., Scotti, J. V., Sanborn, J. J., Skiff, B. A., Beshore, E. C., Odell, A. P., Hill, R. E., Gibbs, A. R., Christensen, E. J., Grauer, A. D., Kowalski, R. A., Larson, S. M., Bezpalko, M., Torres, D., Kracke, R., Spitz, G., Kistler, J., Stuart, J., Scruggs, S., Lepez, H. S., Durig, D. T., Hardage, D. S., Goodgame, J. R., Castellano, J., Takbou, S., Cozzi, E., Valentini, S., Kyrylenko, D., Ivashchenko, Y., Kugel, F., Cremaschini, C., Abate, C., Ciani, M., Grieco V., Villegas J. M., Reszelski M., McNaught, R. H., Garradd, G. J., Benavides, R., Temprano, J., Garcia, J., Arce, E., Navarro P. , J. P., Fletcher, J., Marsden, B. G., MARDIROSSIAN, FABIO, Lehky, M., Tes, L., Boattini, A., Fagioli, G., Mazzucato, M., Dolfi, F., Tombelli, M., Forti, G., Buzzi, L, Naves, R., Campas, M., Hasubick, W., Rinner, C., Reina, E., Ligustri, R., da Rio, D., Michels, H., Kadota, K., Wakuda, S, Herald, D., Mcandrew, S. G., Rodriguez, D., Christie, G. W., Natusch, T., Donato, L., Gonano, V., Guido, E., Sostero, G., Josa, R., Brown, M., Bambery, R., Lawrence, K., Hicks, M., Helin, E., Thicksten, R., Gladman, B., Vanlaerhoven, C., Tucker, R., Bressi, T. H., Scotti, J. V., Sanborn, J. J., Skiff, B. A., Beshore, E. C., Odell, A. P., Hill, R. E., Gibbs, A. R., Christensen, E. J., Grauer, A. D., Kowalski, R. A., Larson, S. M., Bezpalko, M., Torres, D., Kracke, R., Spitz, G., Kistler, J., Stuart, J., Scruggs, S., Lepez, H. S., Durig, D. T., Hardage, D. S., Goodgame, J. R., Castellano, J., Takbou, S., Cozzi, E., Valentini, S., Kyrylenko, D., Ivashchenko, Y., Kugel, F., Cremaschini, C., Abate, C., Ciani, M., Grieco, V., Mardirossian, Fabio, Villegas, J. M., Reszelski, M., Mcnaught, R. H., Garradd, G. J., Benavides, R., Temprano, J., Garcia, J., Arce, E., Navarro P., J. P., Fletcher, J., and Marsden, B. G.

Subjects
astrophysics, comets, astrophysic
Published
2007

11. Observations of Comets

Author

Ticha, J., Tichy, M., Devyatkin, A. V., Bekhteva, A. S., Gorshanov, D. L., Kouprianov, V. V., Aleshkina, E. Yu., Krakosevich, O. V., Barshevich, K. V., Ibragimov, F. M., Baturina, G. D., Tesi, L., Tombelli, M., Fagioli, G., Mazzucato, M., Dolfi, F., Forti, G., Galád, Adrián, Világi, Jozef, Kornos, Leonard, Marinello, W., Micheli, Marco, Pizzetti, G., Soffiantini, A., Apitzsch, R., Galli, G., Buzzi, L., Naves, R., Campas, M., Hasubick, W., Reina, E., Kadota, K., Herald, Dave, Mcandrew, S. G., Sanchez, A., Sarneczky, K., W Christie, G., Gonano, M., Gonano, V., Sostero, G., Guido, E., Kelemen, J., Colas, François, Lecacheux, Jean, Frappa, Eric, Bambery, R., Hicks, M., Lawrence, Kenneth J., Helin, E., Thicksten, R., Tucker, R., Block, M., Block, A. F. Tubbiolo T. H. Bressi M., Mcmillan, R. S., van Ness, M. E., Skiff, B. A., Koehn, B. W., Kowalski, R. A., Christensen, E. J., Hill, R., Larson, S. M., Beshore, Edward C., Garradd, G. J., Grauer, A. D., Mcnaught, R. H., Bezpalko, M., Manguso, L., Torres, D., Kracke, R., Milner, A., Love, H., Stuart, J., Sayer, R., Evans, J., Kommers, J., Salvo, R., Durig, D. T., Dyvig, R., Reddy, V., Castellano, J., Vidal, J. R., Garcia, F., Cortes, E., Takbou, S., Kocher, P., Brinkmann, B., Valentini, S., Peretto, G., Denzau, H., Kyrylenko, D., Ivashchenko, Yury, Kugel, F., Shimomoto, S., Ohshima, Y., Sugiyama, Y., Levy, D., Levy, W., Glinos, T., Yeung, W. K. Y., Sherrod, P. C., Jacques, C., Pimentel, E., Morales, Rafael, Doreste, J. L., Pastor, Sergio, Reyes, J. A., Climent, T., Marsden, Brian G., Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Pôle Planétologie du LESIA, Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

International audience

Published
2006

12. Monitoring solar-type stars for luminosity variations

Author

Lockwood, G. W and Skiff, B. A

Subjects
Astronomy
Abstract

Since 1984, researchers have made more than 1500 differential photometric b (471 nm) and y (551 nm) measurements of three dozen solar-like lower main sequence stars whose chromospheric activity was previosly studied by O. C. Wilson. Here, researchers describe their methodology and the statistical tests used to distinguish intrinsic stellar variability from observational and instrument errors. The incidence of detected variability among the program and comparison stars is summarized. Among the 100 plus pairs of stars measured differentially, only a dozen were found that were unusually constant, with peak-to-peak amplitudes of seasonal mean brightness smaller than 0.3 percent (0.003 mag) over a two-to-three-year interval.

Published
1988

13. Studies of asteroids and comets

Author

Bowell, E. L. G, Lumme, K, Wasserman, L. C, Kreidl, T. J. N, Bus, S. J, and Skiff, B. A

Subjects
Astronomy
Abstract

About 3000 accurate positions of asteroids and comets were measured concentrating particularly on close-Earth approachers, but also targeting asteroids in need for follow-up observations because of unusual orbital characteristics or poor observational history. In 1985, 36 of the discoveries were numbered. Very accurate + or - 0.1 arcsec?) positional measurements were made of P/Halley on four nights in November and December 1985 in support of Giotto mission navigation. The asteroid orbit files were maintained, and ephemeris data for observational planning were supplied to colleagues worldwide. Considerable progress was made in understanding how information on asteroid shapes, surface albedo variegation, and rotational states can be derived from lightcurve and phase curve data. The analytical formulation was completed of a new asteroid magnitude system for the International Astronomical Union; the system was adopted at the New Delhi General Assembly by IAU Commission 20. Photographic photometry of about 10000 images of faint asteroids observed during the course of the United Kingdom Schmidt-CalTech Asteroid Survey in 1981 was continued, completing the microdensitometric scanning and all process of software development for data handling.

Published
1986

14. Topography of the shield volcano, Olympus Mons on Mars

Author

Wu, S. S. C, Garcia, P. A, Jordan, R, Schafer, F. J, and Skiff, B. A

Subjects
Lunar And Planetary Exploration
Abstract

Olympus Mons, one of the largest known shield volcanoes in the solar system, covers an area of more than 3.2 x 10 to the 5th sq km and has a diameter of more than 600 km, excluding its vast aureole deposits. The structure is five times larger than the largest shield volcano on the earth. It is situated on the north-west flank of the Tharsis volcanic region, a broad topographic rise on the Martian surface. The volcano has three physical subdivisions: the summit caldera, the terraced upper flanks, and the lower flanks, which terminate in a scarp 2-10 km high that nearly surrounds the structure. A large block of images of the Tharsis region, including Olympus Mons, was obtained by the Viking mission. A topographic map of Olympus Mons is presented here, which has been compiled using various combinations of stereo pairs of these images, together with stereoscopic perspective views generated by image processing techniques.

Published
1984
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