S / 2004 S 22

S / 2004 S 22
Central body	Saturn
Properties of the orbit
Major semi-axis	20,636,368 km
Periapsis	15,449,877 km
Apoapsis	25,822,859 km
eccentricity	0.2513
Orbit inclination	177.32 °
Orbital time	1106.79 d
Mean orbital velocity	1.345 km / s
Physical Properties
Apparent brightness	25.3 mag
Medium diameter	3 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 22 is one of the smaller outer moons of the planet Saturn .

Discovery and naming

S / 2004 S 22 was discovered on December 12, 2004 by 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 temporary designation S / 2004 S 22 .

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 22 extends from December 12, 2004 to February 1, 2006; there are a total of 14 observations over a period of two years.

Track properties

S / 2004 S 22 orbits Saturn in three years and 11.8 days in a moderately elliptical, retrograde orbit between 15,449,877 km and 25,822,859 km from its center. The orbit eccentricity is 0.251, the orbit is 177.3 ° 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 22 has a diameter of about 3 km. The absolute brightness of the moon is 16.1  ^m .

See also

• List of Saturn's moons
• List of moons of planets and dwarf planets
• List of moons from asteroids

Web links

• Astronews.com: Ring Planet's 20 new moons discovered October 8, 2019 (discovery)

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-T128: S / 2004 S 22 . IAU . October 7, 2019. Retrieved October 10, 2019.

further inside	Saturn moons	further outside
S / 2007 S 3	Semi- major axis  (km) S / 2004 S 22 20,636,368	Aegir