Greip (moon)
Greip | |
---|---|
Provisional or systematic name | S / 2006 S 4 |
Central body | Saturn |
Properties of the orbit | |
Major semi-axis | 18,206,000 km |
Periapsis | 12,273,000 km |
Apoapsis | 24,139,000 km |
eccentricity | 0.3259 |
Orbit inclination | 179.837 ° |
Orbital time | 921.19 d |
Mean orbital velocity | 1.40 km / s |
Physical Properties | |
Apparent brightness | 24.4 mag |
Medium diameter | ≈ 6 km |
Sidereal rotation | ≈ 12 h 45 min |
Acceleration of gravity on the surface | ≈ 0 m / s 2 |
Escape speed | ≈ 0 m / s |
discovery | |
Explorer |
Scott S. Sheppard , David C. Jewitt , |
Date of discovery | January 5, 2006 |
Greip (also Saturn LI) is one of the smaller outer moons of the planet Saturn .
discovery
The discovery of Greip by Scott S. Sheppard , David C. Jewitt , Jan Kleyna and Brian G. Marsden on recordings from January 5 to May 1, 2006 was announced on June 26, 2006.
Greip initially received the provisional designation S / 2006 S 4.
The moon was named after Greip , one of the nine Aegir daughters from Nordic mythology .
Structure and physical data
Greip has a diameter of about 6 km.
Web links
- MPEC 2006-M45: Eight New Satellites of Saturn June 26, 2006 (Discovery and Ephemeris)
- IAUC 8727: Satellites of Saturn June 30, 2006 (Discovery)
- MPEC 2007-G29: S / 2006 S 4 April 11, 2007 (rediscovery)
- IAUC 8873: Satellites of Saturn September 20, 2007 (numbering and naming)
Individual evidence
- ↑ T. Denk, S. Mottola (2019): Studies of irregular satellites: I. Lightcurves and rotation periods of 25 Saturnian moons from Cassini observations. Icarus 322 , 80-102. DOI: 10.1016 / j.icarus.2018.12.040 .
further inside | Saturn moons | further outside |
Tarvos |
Semi- major axis (km) Greip 18,105,000 |
Hyrrokkin |