Mundilfari (moon)

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Mundilfari
Provisional or systematic name S / 2000 S 9
Central body Saturn
Properties of the orbit
Major semi-axis 18,418,000 km
Periapsis 14,587,000 km
Apoapsis 22,249,000 km
eccentricity 0.208
Orbit inclination 167.50 °
Orbital time 951.6 d
Mean orbital velocity 1.41 km / s
Physical Properties
Albedo 0.0
Apparent brightness 23.8 mag
Medium diameter ≈ 7 km
Dimensions ≈ 2.1 × 10 14 kg
Medium density 2.3 g / cm 3
Sidereal rotation ≈ 6 h 44 min
Acceleration of gravity on the surface ≈ 0.0011 m / s 2
Escape speed ≈ 2.8 m / s
discovery
Explorer

Brett Gladman et al.

Date of discovery December 7, 2000

Mundilfari (also Saturn XXV) is one of the smaller outer moons of the planet Saturn .

discovery

The discovery of Mundilfari by a team of Brett Gladman , John J. Kavelaars , Jean-Marc Petit, Hans Scholl , Matthew J. Holman , Brian G. Marsden , Philip D. Nicholson and Joseph A. Burns on September 23rd through November 27, 2000 was announced on December 7, 2000. Mundilfari was initially given the provisional designation S / 2000 S 9. The moon was named after Mundilfari , a giant from Nordic mythology .

Orbit data

Mundilfari orbits Saturn on an eccentric orbit at a mean distance of 18,722,000 km in 951 days and 13 hours. The orbital eccentricity is 0.2078. The orbit is inclined 167.461 ° to the ecliptic and is therefore retrograde, i.e. That is, the moon runs around the planet in the opposite direction to the direction of rotation of Saturn.

Structure and physical data

Mundilfari is about 7 km in diameter and a day-night cycle lasts about 6¾ hours. This is the second shortest known period of rotation for a moon in the entire solar system.

With an apparent brightness of 23.8 m , Mundilfari is an extremely faint object.

Web links

Individual evidence

  1. ↑ a b 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
S / 2004 S 17
Semi- major axis  (km) Mundilfari 18,685,000		 S / 2006 S 1
Well-known moons of planets and dwarf planets


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S / 2004 S 7  • S / 2004 S 12  • S / 2004 S 13  • S / 2004 S 17  • S / 2004 S 20  • S / 2004 S 21  • S / 2004 S 22  • S / 2004 S 23  • S / 2004 S 24  • S / 2004 S 25  • S / 2004 S 26  • S / 2004 S 27  • S / 2004 S 28  • S / 2004 S 29  • S / 2004 S 30  • S / 2004 S 31  • S / 2004 S 32  • S / 2004 S 33  • S / 2004 S 34  • S / 2004 S 35  • S / 2004 S 36  • S / 2004 S 37  • S / 2004 S 38  • S / 2004 S 39  • S / 2006 S 1  • S / 2006 S 3  • S / 2007 S 2  • S / 2007 S 3  • S / 2009 S 1

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Pluto

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Haumea

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Makemake

S / 2015 (136472) 1

Eris

Dysnomia