S / 2004 S 26
S / 2004 S 26 | |
---|---|
Central body | Saturn |
Properties of the orbit | |
Major semi-axis | 26,676,218 km |
Periapsis | 22,287,318 km |
Apoapsis | 31,065,117 km |
eccentricity | 0.1645 |
Orbit inclination | 171.37 ° |
Orbital time | 1626.67 d |
Mean orbital velocity | 1.183 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 | |
Date of discovery | December 12, 2004 |
S / 2004 S 26 is one of the smaller outer moons of the planet Saturn . It is currently the outermost known moon of Saturn; Fornjot had previously held this quality .
Discovery and naming
S / 2004 S 26 was discovered on December 12, 2004 by astronomers Scott Sheppard and David Jewitt ( University of California ) as well as 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 provisional designation S / 2004 S 26 .
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 26 extends from December 12, 2004 to March 21, 2007; there are a total of 21 observations over a period of three years.
Track properties
S / 2004 S 26 orbits Saturn in four years and 166.7 days on a slightly elliptical, retrograde orbit between 22,287,318 km and 31,065,117 km from its center. The orbital eccentricity is 0.165, the web is 171.4 ° 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 26 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-T133: S / 2004 S 26 . IAU . October 7, 2019. Retrieved October 10, 2019.
further inside | Saturn moons | further outside |
Fornjot |
Semi- major axis (km) S / 2004 S 26 26,676,218 |