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S/2019 S 21

S/2019 S 21
Discovery 
Discovered byScott S. Sheppard, David C. Jewitt, Jan Kleyna, Brett J. Gladman, E. Ashton
Discovery date2019
Orbital characteristics 
26,439,000 km (16,428,000 mi)[1]
Eccentricity0.155
-4.480 yrs (1,636.32 d)[1]
Inclination171.9° (to the ecliptic)
Satellite ofSaturn
GroupNorse group
Physical characteristics
4 km
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.[2]

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.[2] 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.[3]

References

  1. ^ a b c "Planetary Satellite Mean Elements". Jet Propulsion Laboratory. California Institute of Technology. Retrieved 16 May 2023.
  2. ^ a b c "MPEC 2023-K05 : S/2019 S 21". Minor Planet Electronic Circular. Minor Planet Center. Retrieved 16 May 2023.
  3. ^ a b "S/2019 S 21". Tilmann's Web Site. Tilmann Denk. Retrieved 24 December 2023.
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