S/2019 S 21
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.
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard, David C. Jewitt, Jan Kleyna, Brett J. Gladman, E. Ashton |
| Discovery date | 2019 |
| Orbital characteristics | |
| 26,439,000 km (16,428,000 mi) | |
| Eccentricity | 0.155 |
| -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 |
| 16.2 | |
S/2019 S 21 is about 4 kilometers in diameter, and orbits Saturn at a 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.
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