Hyperion (S VII): Shape, mosaic and control point network

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-12-17 DOI:10.1016/j.icarus.2024.116440

A.E. Zubarev, I.E. Nadezhdina

引用次数: 0

Abstract

Saturn's odd-shaped satellite Hyperion is unique in its chaotic rotation. Owing to limited observational data, there is currently no functional model describing the object's changing orientation in space, commonly agreed upon. Consequently, there is also no established body-fixed reference frame, critical for the creation of mapping products. Using best 166 images obtained until the end of the Cassini mission we computed a new Control Point Network (CPN) of more than 2000 points for the satellite. On this basis, we established a reference frame working model for Hyperion, useful for estimates of new shape parameters and follow-up mapping products. Consequently, we find best-fit ellipsoid parameters of 180.9 × 129.0 × 102.0 km as well as new estimates for bulk density of 565 kg/km3, which is ∼4 % more than the values previously obtained by other researchers (P.C. Thomas; R.A. Jacobson). Based on the new CPN and reference frame, global mapping products were created, which included a gridded DEM and an orthomosaic (best resolution: 50 m/pixel).

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.