S / 2004 S 23
S / 2004 S 23 | |
---|---|
Central body | Saturn |
Properties of the orbit | |
Major semi-axis | 21,163,491 km |
Periapsis | 13,271,773 km |
Apoapsis | 29,055,209 km |
eccentricity | 0.3729 |
Orbit inclination | 176.99 ° |
Orbital time | 1149.46 d |
Mean orbital velocity | 1.328 km / s |
Physical Properties | |
Apparent brightness | 24.8 mag |
Medium diameter | 4 km |
Acceleration of gravity on the surface | ≈ 0 m / s 2 |
Escape speed | ≈ 0 m / s |
discovery | |
Explorer | |
Date of discovery | December 12, 2004 |
S / 2004 S 23 is one of the smaller outer moons of the planet Saturn .
Discovery and naming
S / 2004 S 23 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 23 .
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 23 extends from December 12, 2004 to March 22, 2007; there are a total of 21 observations over a period of three years.
Track properties
S / 2004 S 23 orbits Saturn in three years and 54.5 days in a strongly elliptical, retrograde orbit between 13,271,773 km and 29,055,209 km from its center. The orbital eccentricity is 0.373, the orbit is 177 ° 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 23 has a diameter of about 4 km. The absolute brightness of the moon is 15.6 m .
See also
Web links
- Astronews.com: Ring Planet's 20 new moons discovered October 8, 2019 (discovery)
Individual evidence
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ^ Scott S. Sheppard : Saturn Moons . Carnegie Institution for Science . Retrieved October 10, 2019.
- ↑ MPC : MPEC 2019-T129: S / 2004 S 23 . IAU . October 7, 2019. Retrieved October 10, 2019.
further inside | Saturn moons | further outside |
S / 2006 S 3 |
Semi- major axis (km) S / 2004 S 23 21.163.491 |
S / 2004 S 25 |