S / 2004 S 28
| S / 2004 S 28 | |
|---|---|
| Central body | Saturn |
| Properties of the orbit | |
| Major semi-axis | 22,019,789 km |
| Periapsis | 18,876,334 km |
| Apoapsis | 25,163,244 km |
| eccentricity | 0.1427 |
| Orbit inclination | 170.32 ° |
| Orbital time | 1219.93 d |
| Mean orbital velocity | 1.302 km / s |
| Physical Properties | |
| Apparent brightness | 24.9 likes |
| 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 28 is one of the smaller outer moons of the planet Saturn .
Discovery and naming
S / 2004 S 28 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 28 .
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 28 extends from December 12, 2004 to February 2, 2006; there are a total of 24 observations over a period of two years.
Track properties
S / 2004 S 28 orbits Saturn in three years and 124.9 days on a slightly elliptical, retrograde orbit between 18,876,334 km and 25,163,244 km from its center. The orbital eccentricity is 0.143, the orbit is 170.3 ° 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 28 has a diameter of about 4 km. The absolute brightness of the moon is 15.8 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-T135: S / 2004 S 28 . IAU . October 7, 2019. Retrieved October 10, 2019.
| further inside | Saturn moons | further outside |
| S / 2004 S 38 |
Semi- major axis (km) S / 2004 S 28 22.019.789 |
S / 2004 S 35 |