Equipotential Figure of Phobos Suggests Its Late Accretion Near 3.3 Mars Radii

dc.contributor.authorHu, Xuanyu
dc.contributor.authorOberst, Jürgen
dc.contributor.authorWillner, Konrad
dc.date.accessioned2020-11-16T13:41:31Z
dc.date.available2020-11-16T13:41:31Z
dc.date.issued2020-03-30
dc.date.updated2020-11-02T14:08:23Z
dc.description.abstractThe ellipsoidal figure of Phobos has been tentatively interpreted as resulting from accretion in a tidal environment close to its parent planet Mars. The issue is compounded by the rapid tidal decay of the moon's orbit. Consequently, when and where the moon actually formed remains elusive. We determined the gravity equipotential ellipsoid of Phobos during its orbital decay and studied the evolution of surface ellipsoidal heights. We found that the equipotential ellipsoid closely fits the body shape near 3.6 Mars radii. Meanwhile, the height distribution resembles Gaussian at 3.3 Mars radii, suggesting equilibrium of topography. The ellipsoidal shape may have accreted here under appreciable tidal influence of roughly half the magnitude at Phobos' current position (at 2.76 Mars radii). This lends evidential support to the hypothesis that Phobos is not a primordial object but has reaccreted from a debris ring after a previous disruption event.en
dc.description.sponsorshipTU Berlin, Open-Access-Mittel – 2020en
dc.identifier.eissn1944-8007
dc.identifier.issn0094-8276
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11969
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10851
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/en
dc.subject.ddc550 Geowissenschaftende
dc.subject.otherMarsen
dc.subject.otherPhobosen
dc.subject.othertopographyen
dc.titleEquipotential Figure of Phobos Suggests Its Late Accretion Near 3.3 Mars Radiien
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumbere2019GL085958en
dcterms.bibliographicCitation.doi10.1029/2019GL085958en
dcterms.bibliographicCitation.issue7en
dcterms.bibliographicCitation.journaltitleGeophysical Research Lettersen
dcterms.bibliographicCitation.originalpublishernameWileyen
dcterms.bibliographicCitation.originalpublisherplaceNew York, NYen
dcterms.bibliographicCitation.volume47en
tub.accessrights.dnbfreeen
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Geodäsie und Geoinformationstechnik::FG Planetengeodäsiede
tub.affiliation.facultyFak. 6 Planen Bauen Umweltde
tub.affiliation.groupFG Planetengeodäsiede
tub.affiliation.instituteInst. Geodäsie und Geoinformationstechnikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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