| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard, David C. Jewitt, Jan Kleyna, Brett J. Gladman, E. Ashton |
| Discovery date | 2019 |
| Orbital characteristics | |
| Semi-major axis | 26,439,000 km (16,428,000 mi) |
| Eccentricity | 0.155 |
| Orbital period (sidereal) | -4.480 yrs (1,636.32 d) |
| Inclination | 171.9° (to the ecliptic) |
| Satellite of | Saturn |
| Group | Norse group |
| Physical characteristics | |
| Mean diameter | 4 km |
| Absolute magnitude (H) | 16.2 |
S/2019 S 21 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, Edward Ashton, Brett J. Gladman, Jean-Marc Petit and Mike Alexandersen on May 16, 2023 from observations taken between February 2, 2006 and July 8, 2021.
S/2019 S 21 is about 4 kilometers in diameter, and orbits Saturn at an average distance of 26.076 Gm in 1,572.06 days, at an inclination of 171.5, orbits in retrograde direction and eccentricity of 0.125. S/2019 S 21 belongs to the Norse group and one of the most distant moons from Saturn along with S/2004 S 26, S/2004 S 52 and S/2020 S 9.
References
- ^ "Planetary Satellite Mean Elements". Jet Propulsion Laboratory. California Institute of Technology. Retrieved 16 May 2023.
- ^ "MPEC 2023-K05 : S/2019 S 21". Minor Planet Electronic Circular. Minor Planet Center. Retrieved 16 May 2023.
- ^ "S/2019 S 21". Tilmann's Web Site. Tilmann Denk. Retrieved 24 December 2023.
| Moons of Saturn | |||||||
|---|---|---|---|---|---|---|---|
| Listed in approximate increasing distance from Saturn | |||||||
| Ring moonlets | |||||||
| Ring shepherds | |||||||
| Other inner moons | |||||||
| Alkyonides | |||||||
| Large moons (with trojans) | |||||||
| Inuit group (13) |
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| Gallic group (7) | |||||||
| Norse group (100) |
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| Outlier prograde irregular moons |
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