Bergelmir (moon)

Bergelmir
Provisional or systematic name	S / 2004 S 15
Central body	Saturn
Properties of the orbit
Major semi-axis	19,338,000 km
Periapsis	16,592,000 km
Apoapsis	22,084,000 km
eccentricity	0.142
Orbit inclination	158.5 °
Orbital time	1005.9 d
Mean orbital velocity	1.39 km / s
Physical Properties
Apparent brightness	24.2 mag
Medium diameter	≈ 6 km
Dimensions	≈? kg
Sidereal rotation	≈ 8 h 8 min
Acceleration of gravity on the surface	≈ 0 m / s 2
Escape speed	≈ 0 m / s
discovery
Explorer	David C. Jewitt , Scott S. Sheppard , Jan Kleyna , Brian G. Marsden
Date of discovery	December 12, 2004

Bergelmir (also Saturn XXXVIII) is one of the smaller outer moons of the planet Saturn .

discovery

The discovery of Bergelmir by David C. Jewitt , Scott S. Sheppard , Jan Kleyna and Brian G. Marsden on recordings from December 12, 2004 to March 9, 2005, was announced on May 3, 2005.
Bergelmir was initially given the provisional designation S / 2004 S 15. In April 2007 the moon was named after the giant Bergelmir , a grandson of Ymir , from Nordic mythology .

Orbit data

Bergelmir orbits Saturn on an eccentric retrograde orbit in around 985 days and 23 hours. The orbital eccentricity is 0.123, the orbit is inclined at 157.39 ° to the ecliptic .

Structure and physical data

Bergelmir has a diameter of about 6 km.

Web links

• MPEC 2005-J13: Twelve New Satellites of Saturn May 3, 2005 (Discovery and Ephemeris)
• IAUC 8523: New Satellites of Saturn May 4, 2005 (discovery)
• MPEC 2006-C55: S / 2004 S 10, S / 2004 S 11, S / 2004 S 15, S / 2004 S 18 February 10, 2006 (rediscovery)
• IAUC 8826: Satellites of Jupiter and Saturn April 5, 2007 (numbering and naming)

Individual evidence

1. ↑ 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
Narvi	Semi- major axis  (km) Bergelmir 19,338,000	S / 2004 S 20