S/2005 S 5

S/2005 S 5

Discovery
Discovered by	Scott S. Sheppard, David C. Jewitt, Jan Kleyna, Brett J. Gladman, Edward Ashton
Discovery date	2005
Orbital characteristics
Semi-major axis	21,366,200 km (13,276,300 mi)[1]
Eccentricity	0.588
Orbital period (sidereal)	-3.225 yrs (1,177.82 d)[1]
Inclination	169.5° (to the ecliptic)
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	3 km
Absolute magnitude (H)	16.4

S/2005 S 5 is a small and faint 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 10, 2023 from observations taken between March 9, 2005 and July 24, 2020.^[2]

S/2005 S 5 was the 100th irregular moon of Saturn ever announced.^[3][2]

Physical Characteristics, Orbit and Origin

S/2005 S 5 orbits Saturn at a distance of 21.030 Gm in 1,138.62 days, at an inclination of 172.52, orbits in retrograde direction and eccentricity of 0.510.^[2] S/2005 S 5 belongs to the Norse group and a member of the Mundilfari subgroup, possibly a fragment of Mundilfari.^[4]

S/2005 S 5 is estimated to be about 3 kilometers in diameter.

References

1. "Planetary Satellite Mean Elements". Jet Propulsion Laboratory. California Institute of Technology. Retrieved 10 May 2023.
2. "MPEC 2023-J285 : S/2005 S 5". Minor Planet Electronic Circular. Minor Planet Center. Retrieved 10 May 2023.
3. "S/2005 S 5". Tilmann's Web Site. Tilmann Denk. Retrieved 23 December 2023.
4. Ashton, Edward; Gladman, Brett; Alexandersen, Mike; Petit, Jean-Marc (10 March 2025). "Retrograde predominance of small saturnian moons reiterates a recent retrograde collisional disruption". Planetary Science Journal. arXiv:2503.07081. Retrieved 1 May 2025.