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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

카시니(Cassini)의 진동측정을 통한 토성의 달 미마스(Mimas)의 내부구조 추정

Constraints on Mimas’ interior from Cassini ISS libration measurements
  • 작성자 : KASI
  • 작성일 : 2014-10-20
  • 조회수 : 3789
  • 저자R. Tajeddine, N. Rambaux et.al.
  • Absract

     

    Like our Moon, the majority of the solar system’s satellites are locked in a 1:1 spin-orbit resonance; on average, these satellites show the same face toward the planet at a constant rotation rate equal to the satellite’s orbital rate. In addition to the uniform rotational motion, physical librations (oscillations about an equilibrium) also occur. The librations may contain signatures of the satellite’s internal properties. Using stereophotogrammetry on Cassini Image Science Subsystem (ISS) images, we measured longitudinal physical forced librations of Saturn’s moon Mimas. Our measurements confirm all the libration amplitudes calculated from the orbital dynamics, with one exception. This amplitude depends mainly on Mimas’ internal structure and has an observed value of twice the predicted one, assuming hydrostatic equilibrium. After considering various possible interior models of Mimas, we argue that the satellite has either a large nonhydrostatic interior, or a hydrostatic one with an internal ocean beneath a thick icy shell.

     


  • 게재정보SCIENCE(2014.10.19)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.sciencemag.org/content/346/6207/322.full
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