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S/2019 S 21
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.^[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

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