Greip (moon)

Summary

Greip
Greip-cassini.png
Greip imaged by the Cassini spacecraft in September 2015
Discovery
Discovered byScott S. Sheppard
David C. Jewitt
Jan T. Kleyna
Brian G. Marsden
Discovery date2006
Designations
Designation
Saturn LI
Named after
Greipa
S/2006 S 4
Orbital characteristics[1]
18206000 km
Eccentricity0.326
−921.2 days
Inclination179.8°
Satellite ofSaturn
GroupNorse group
Physical characteristics
Mean diameter
5+50%
−30%
 km
[2]
12.75±0.35? h[2]
24.4

Greip /ˈɡrp/ or Saturn LI is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 26 June 2006, from observations taken between 5 January and 1 May 2006. Greip is about 6 kilometres in diameter, and orbits Saturn at an average distance of 18,066 Mm in 906.556 days, at an inclination of 172.7° to the ecliptic (159.2° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.3735. Its rotation period is 12.75±0.35 hours.[2]

It is named after Greip, a giantess in Norse mythology.

References

  1. ^ S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
  2. ^ a b c Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
  • Institute for Astronomy Saturn Satellite Data
  • IAUC 8727: Satellites of Saturn[permanent dead link] June 30, 2006 (discovery)
  • MPEC 2006-M45: Eight New Satellites of Saturn June 26, 2006 (discovery and ephemeris)
  • IAUC 8873: Satellites of Saturn[permanent dead link] September 20, 2007 (naming)