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Article overview
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Masses of Nix and Hydra | David J. Tholen
; Marc W. Buie
; William M. Grundy
; Garrett T. Elliott
; | Date: |
8 Dec 2007 | Abstract: | A four-body orbit solution for the Pluto system yields GM values of 870.3 +/-
3.7, 101.4 +/- 2.8, 0.039 +/- 0.034, and 0.021 +/- 0.042 km3 sec-2 for Pluto,
Charon, Nix, and Hydra, respectively. Assuming a Charon-like density of 1.63 gm
cm-3, the implied diameters for Nix and Hydra are 88 and 72 km, leading to
visual geometric albedos of 0.08 and 0.18, respectively, though with
considerable uncertainty. The eccentricity of Charon’s orbit has a significant
nonzero value; however, the 0.030 +/- 0.009 deg yr-1 rate at which the line of
apsides precesses is insufficient to explain the difference in the longitude of
periapsis seen in the orbits fitted to the 1992-1993 and 2002-2003 data sets.
The mean orbital periods for Hydra, Nix, and Charon are in the ratios of 6.064
+/- 0.006 : 3.991 +/- 0.007 : 1, but we have not identified any resonant
arguments that would indicate the existence of a mean motion resonance between
any pairs of satellites. | Source: | arXiv, 0712.1261 | Services: | Forum | Review | PDF | Favorites |
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