Yang, X., Yan, J. G., Andert, T., Ye, M., Paetzold, M., Hahn, M., Jin, W. T., Li, F. and Barriot, J. P. (2019). The second-degree gravity coefficients of Phobos from two Mars Express flybys. Mon. Not. Roy. Astron. Soc., 490 (2). S. 2007 - 2013. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

Several close spacecraft flybys of Phobos have been performed over the past 40 yr in order to determine the gravity field of this tiny Martian moon. En this work, the second-degree coefficients of the gravity field of Phobos were derived from the radio tracking data of two combined Mars Express flybys (2010 and 2013), by applying a least squares regularized inverse technique, that introduces as an a priori the gravity field retrieved from a shape model based on constant density hypothesis. A gravitational mass estimate of (7.0765 +/- 0.0075) x 10(5) m(3) s(-2) and second-degree gravity coefficients C-20 = -0.1378 + 0.0348 and C-22 = 0.0166 +/- 0.0153(3 sigma) were derived, The estimated C-20 value, in contrast to the value of C-20 computed from the shape model under the constant density assumption, supports an inhomogeneous distribution inside Phobos at a confidence interval of 95 per cent (1.96 sigma). This result indicates a denser mass in the equatorial region or lighter mass in polar areas.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Yang, X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yan, J. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Andert, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ye, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hahn, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jin, W. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Li, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barriot, J. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-126601
DOI: 10.1093/mnras/stz2695
Journal or Publication Title: Mon. Not. Roy. Astron. Soc.
Volume: 490
Number: 2
Page Range: S. 2007 - 2013
Date: 2019
Publisher: OXFORD UNIV PRESS
Place of Publication: OXFORD
ISSN: 1365-2966
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
FIELD; ORBITS; MODELS; MASS; SURFACE; SHAPEMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12660

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