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The geology and geophysics of Kuiper Belt object (486958) Arrokoth

2020; American Association for the Advancement of Science; Volume: 367; Issue: 6481 Linguagem: Inglês

10.1126/science.aay3999

1095-9203

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

Space Exploration and Technology

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.