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3 results on '"Haberle, C."'

1. Asteroid (101955) Bennu’s weak boulders and thermally anomalous equator

Author

Rozitis, B., Ryan, A. J., Emery, J. P., Christensen, P. R., Hamilton, V. E., Simon, A. A., Reuter, D. C., Al Asad, M., Ballouz, R.-L., Bandfield, J. L., Barnouin, O. S., Bennett, C. A., Bernacki, M., Burke, K. N., Cambioni, S., Clark, B. E., Daly, M. G., Delbo, M., DellaGiustina, D. N., Elder, C. M., Hanna, R. D., Haberle, C. W., Howell, E. S., Golish, D. R., Jawin, E. R., Kaplan, H. H., Lim, L. F., Molaro, J. L., Munoz, D. Pino, Nolan, M. C., Rizk, B., Siegler, M. A., Susorney, H. C. M., Walsh, K. J., Lauretta, D. S., Rozitis, B., Ryan, A. J., Emery, J. P., Christensen, P. R., Hamilton, V. E., Simon, A. A., Reuter, D. C., Al Asad, M., Ballouz, R.-L., Bandfield, J. L., Barnouin, O. S., Bennett, C. A., Bernacki, M., Burke, K. N., Cambioni, S., Clark, B. E., Daly, M. G., Delbo, M., DellaGiustina, D. N., Elder, C. M., Hanna, R. D., Haberle, C. W., Howell, E. S., Golish, D. R., Jawin, E. R., Kaplan, H. H., Lim, L. F., Molaro, J. L., Munoz, D. Pino, Nolan, M. C., Rizk, B., Siegler, M. A., Susorney, H. C. M., Walsh, K. J., and Lauretta, D. S.

Abstract

Thermal inertia and surface roughness are proxies for the physical characteristics of planetary surfaces. Global maps of these two properties distinguish the boulder population on near-Earth asteroid (NEA) (101955) Bennu into two types that differ in strength, and both have lower thermal inertia than expected for boulders and meteorites. Neither has strongly temperature-dependent thermal properties. The weaker boulder type probably would not survive atmospheric entry and thus may not be represented in the meteorite collection. The maps also show a high–thermal inertia band at Bennu’s equator, which might be explained by processes such as compaction or strength sorting during mass movement, but these explanations are not wholly consistent with other data. Our findings imply that other C-complex NEAs likely have boulders similar to those on Bennu rather than finer-particulate regoliths. A tentative correlation between albedo and thermal inertia of C-complex NEAs may be due to relative abundances of boulder types.

2. Evidence for widespread hydrated minerals on asteroid (101955) Bennu

Author

Hamilton, V. E., Simon, A. A., Christensen, P. R., Reuter, D. C., Clark, B. E., Barucci, M. A., Bowles, N. E., Boynton, W. V., Brucato, J. R., Cloutis, E. A., Connolly, H. C., Donaldson Hanna, K. L., Emery, J. P., Enos, H. L., Fornasier, S., Haberle, C. W., Hanna, R. D., Howell, E. S., Kaplan, H. H., Keller, L. P., Lantz, C., Li, J.-Y., Lim, L. F., McCoy, T. J., Merlin, F., Nolan, M. C., Praet, A., Rozitis, Benjamin, Sandford, S. A., Schrader, D. L., Thomas, C. A., Zou, X.-D., Lauretta, D. S., Hamilton, V. E., Simon, A. A., Christensen, P. R., Reuter, D. C., Clark, B. E., Barucci, M. A., Bowles, N. E., Boynton, W. V., Brucato, J. R., Cloutis, E. A., Connolly, H. C., Donaldson Hanna, K. L., Emery, J. P., Enos, H. L., Fornasier, S., Haberle, C. W., Hanna, R. D., Howell, E. S., Kaplan, H. H., Keller, L. P., Lantz, C., Li, J.-Y., Lim, L. F., McCoy, T. J., Merlin, F., Nolan, M. C., Praet, A., Rozitis, Benjamin, Sandford, S. A., Schrader, D. L., Thomas, C. A., Zou, X.-D., and Lauretta, D. S.

Abstract

Early spectral data from the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission reveal evidence for abundant hydrated minerals on the surface of near-Earth asteroid (101955) Bennu in the form of a near-infrared absorption near 2.7 µm and thermal infrared spectral features that are most similar to those of aqueously altered CM-type carbonaceous chondrites. We observe these spectral features across the surface of Bennu, and there is no evidence of substantial rotational variability at the spatial scales of tens to hundreds of metres observed to date. In the visible and near-infrared (0.4 to 2.4 µm) Bennu’s spectrum appears featureless and with a blue (negative) slope, confirming previous ground-based observations. Bennu may represent a class of objects that could have brought volatiles and organic chemistry to Earth.

3. Asteroid (101955) Bennu’s weak boulders and thermally anomalous equator

Author

Rozitis, B., Ryan, A. J., Emery, J. P., Christensen, P. R., Hamilton, V. E., Simon, A. A., Reuter, D. C., Al Asad, M., Ballouz, R.-L., Bandfield, J. L., Barnouin, O. S., Bennett, C. A., Bernacki, M., Burke, K. N., Cambioni, S., Clark, B. E., Daly, M. G., Delbo, M., DellaGiustina, D. N., Elder, C. M., Hanna, R. D., Haberle, C. W., Howell, E. S., Golish, D. R., Jawin, E. R., Kaplan, H. H., Lim, L. F., Molaro, J. L., Munoz, D. Pino, Nolan, M. C., Rizk, B., Siegler, M. A., Susorney, H. C. M., Walsh, K. J., Lauretta, D. S., Rozitis, B., Ryan, A. J., Emery, J. P., Christensen, P. R., Hamilton, V. E., Simon, A. A., Reuter, D. C., Al Asad, M., Ballouz, R.-L., Bandfield, J. L., Barnouin, O. S., Bennett, C. A., Bernacki, M., Burke, K. N., Cambioni, S., Clark, B. E., Daly, M. G., Delbo, M., DellaGiustina, D. N., Elder, C. M., Hanna, R. D., Haberle, C. W., Howell, E. S., Golish, D. R., Jawin, E. R., Kaplan, H. H., Lim, L. F., Molaro, J. L., Munoz, D. Pino, Nolan, M. C., Rizk, B., Siegler, M. A., Susorney, H. C. M., Walsh, K. J., and Lauretta, D. S.

Abstract

Thermal inertia and surface roughness are proxies for the physical characteristics of planetary surfaces. Global maps of these two properties distinguish the boulder population on near-Earth asteroid (NEA) (101955) Bennu into two types that differ in strength, and both have lower thermal inertia than expected for boulders and meteorites. Neither has strongly temperature-dependent thermal properties. The weaker boulder type probably would not survive atmospheric entry and thus may not be represented in the meteorite collection. The maps also show a high–thermal inertia band at Bennu’s equator, which might be explained by processes such as compaction or strength sorting during mass movement, but these explanations are not wholly consistent with other data. Our findings imply that other C-complex NEAs likely have boulders similar to those on Bennu rather than finer-particulate regoliths. A tentative correlation between albedo and thermal inertia of C-complex NEAs may be due to relative abundances of boulder types.

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