S / 2004 S 20

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S / 2004 S 20
Central body Saturn
Properties of the orbit
Major semi-axis 19,418,103 km
Periapsis 15,595,725 km
Apoapsis 23,240,481 km
eccentricity 0.1968
Orbit inclination 162.57 °
Orbital time 1010.24 d
Mean orbital velocity 1.386 km / s
Physical Properties
Apparent brightness 25.0 mag
Medium diameter 4 km
Acceleration of gravity on the surface ≈ 0 m / s 2
Escape speed ≈ 0 m / s
discovery
Explorer

Scott S. Sheppard
David C. Jewitt
Jan T. Kleyna

Date of discovery December 12, 2004

S / 2004 S 20 is one of the smaller outer moons of the planet Saturn .

Discovery and naming

S / 2004 S 20 was discovered on December 12, 2004 by the astronomers Scott Sheppard and David Jewitt ( University of California ) and Jan Kleyna ( University of Hawaii ) on images taken from December 12, 2004 to March 22, 2007 with the 8.2 m Subaru telescope at the Mauna Kea Observatory . From this period 19 more moons of Saturn could be detected; the discovery was announced on October 7, 2019, the moon was given the preliminary designation S / 2004 S 20 .

The Carnegie Institution for Science called with the announcement of the discovery on the public to to 6 December 2019 to send in suggestions for names for a total of 20 newly discovered moons. According to the group affiliation of the moons, names of giants from the Gallic , Nordic or Inuit mythology should be used.

The observation period of S / 2004 S 20 extends from December 12 to March 22, 2007; there are a total of 18 observations over a period of three years.

Track properties

S / 2004 S 20 orbits Saturn in two years and 280.24 days in a moderately elliptical, retrograde orbit between 15,595,725 km and 23,240,481 km from its center. The orbit eccentricity is 0.197, the orbit is 162.6 ° inclined to the equator of Saturn .

The moon is part of the so-called Nordic group of Saturn moons, which orbit the planet with orbital inclinations between 145.2 ° and 177.5 ° and orbital eccentricities between 0.130 and 0.580 retrograde.

Physical Properties

S / 2004 S 20 has a diameter of about 4 km. The absolute brightness of the moon is 15.8  m .

See also

Web links

Individual evidence

  1. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  2. ^ Scott S. Sheppard : Saturn Moons . Carnegie Institution for Science . Retrieved October 10, 2019.
  3. ↑ MPC : MPEC 2019-T126: S / 2004 S 20 . IAU . October 7, 2019. Retrieved October 10, 2019.
further inside Saturn moons further outside
Bergelmir
Semi- major axis  (km) S / 2004 S 20 19.418.103		 Suttungr
Well-known moons of planets and dwarf planets


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S / 2003 Y 10  • S / 2003 Y 12  • S / 2003 Y 16  • S / 2003 Y 18  • S / 2003 Y 19  • S / 2003 Y 2  • S / 2003 Y 23  • S / 2003 Y 4  • S / 2003 Y 9  • S / 2010 Y 1  • S / 2010 Y 2  • S / 2011 Y 1  • S / 2011 Y 2  • S / 2016 Y 1  • S / 2017 Y 1  • S / 2017 Y 2  • S / 2017 Y 3  • S / 2017 Y 5  • S / 2017 Y 6  • S / 2017 Y 7  • S / 2017 Y 8  • S / 2017 Y 9

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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

Hi'iaka  • Namaka

Makemake

S / 2015 (136472) 1

Eris

Dysnomia