Hyrrokkin (moon)

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Hyrrokkin
Provisional or systematic name S / 2004 S 19
Central body Saturn
Properties of the orbit
Major semi-axis 18,437,000 km
Periapsis 12,297,000 km
Apoapsis 24,577,000 km
eccentricity 0.333
Orbit inclination 151.4 °
Orbital time 931.8 d
Mean orbital velocity 1.40 km / s
Physical Properties
Apparent brightness 23.5 likes
Medium diameter ≈ 8 km
Dimensions ≈ kg
Sidereal rotation ≈ 12 h 46 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 13, 2004

Hyrrokkin (also Saturn XLIV) is one of the smaller outer moons of the planet Saturn .

discovery

The discovery of Hyrrokkin by David C. Jewitt , Scott S. Sheppard , Jan Kleyna and Brian G. Marsden on recordings from December 12, 2004 to April 30, 2006, was announced on June 26, 2006.
Hyrrokkin was initially given the provisional designation S / 2004 S 19. In April 2007, the moon was named after the giantess Hyrrokkin from Norse mythology .
The name Hyrokkin is often used for the moon, and this name was first published. However, the Working Group for Planetary System Nomenclature (WGPSN) of the International Astronomical Union (IAU) later decided to use the original Nordic spelling.

Orbit data

Hyrrokkin orbits Saturn in a retrograde orbit in approximately 932 days. The orbit eccentricity is 0.333, with the orbit inclined at 151.4 ° to the ecliptic .

Structure and physical data

Hyrrokkin has a diameter of about 8 km.

Web links

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
Greip
Semi- major axis  (km) Hyrrokkin 18,437,000		 S / 2004 S 13
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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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Dysnomia