S / 2004 S 38
| S / 2004 S 38 | |
|---|---|
| Central body | Saturn |
| Properties of the orbit | |
| Major semi-axis | 21,907,965 km |
| Periapsis | 12,343,668 km |
| Apoapsis | 31,472,262 km |
| eccentricity | 0.4366 |
| Orbit inclination | 154.09 ° |
| Orbital time | 1210.65 d |
| Mean orbital velocity | 1.305 km / s |
| Physical Properties | |
| Apparent brightness | 25.1 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 38 is one of the smaller outer moons of the planet Saturn .
Discovery and naming
S / 2004 S 38 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 8, 2019, the moon was given the provisional designation S / 2004 S 38 .
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 38 extends from December 12, 2004 to March 22, 2007; there are a total of 15 observations over a period of three years.
Track properties
S / 2004 S 38 orbits Saturn in three years and 115.7 days in a strongly elliptical, retrograde orbit between 12,343,668 km and 31,472,262 km from its center. The orbital eccentricity is 0.437, the web is 154.1 ° relative to the equator of Saturn inclined .
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 38 has a diameter of about 4 km. The absolute brightness of the moon is 15.9 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-T160: S / 2004 S 38 . IAU . October 8, 2019. Retrieved October 10, 2019.
| further inside | Saturn moons | further outside |
| S / 2004 S 32 |
Semi- major axis (km) S / 2004 S 38 21,907,965 |
S / 2004 S 28 |