| Literature DB >> 26989256 |
H A Weaver1, M W Buie2, B J Buratti3, W M Grundy4, T R Lauer5, C B Olkin2, A H Parker2, S B Porter2, M R Showalter6, J R Spencer2, S A Stern2, A J Verbiscer7, W B McKinnon8, J M Moore9, S J Robbins2, P Schenk10, K N Singer2, O S Barnouin11, A F Cheng11, C M Ernst11, C M Lisse11, D E Jennings12, A W Lunsford12, D C Reuter12, D P Hamilton13, D E Kaufmann2, K Ennico9, L A Young2, R A Beyer14, R P Binzel15, V J Bray16, A L Chaikin17, J C Cook2, D P Cruikshank9, C M Dalle Ore9, A M Earle16, G R Gladstone18, C J A Howett2, I R Linscott19, F Nimmo20, J Wm Parker2, S Philippe21, S Protopapa13, H J Reitsema2, B Schmitt21, T Stryk22, M E Summers23, C C C Tsang2, H H B Throop24, O L White9, A M Zangari2.
Abstract
The New Horizons mission has provided resolved measurements of Pluto's moons Styx, Nix, Kerberos, and Hydra. All four are small, with equivalent spherical diameters of ~40 kilometers for Nix and Hydra and ~10 kilometers for Styx and Kerberos. They are also highly elongated, with maximum to minimum axis ratios of ~2. All four moons have high albedos (~50 to 90%) suggestive of a water-ice surface composition. Crater densities on Nix and Hydra imply surface ages of at least 4 billion years. The small moons rotate much faster than synchronous, with rotational poles clustered nearly orthogonal to the common pole directions of Pluto and Charon. These results reinforce the hypothesis that the small moons formed in the aftermath of a collision that produced the Pluto-Charon binary.Entities:
Year: 2016 PMID： 26989256 DOI： 10.1126/science.aae0030
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728