S/2004 S 7

S/2004 S 7 is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on 4 May 2005 from observations taken between 12 December 2004 and 8 March 2005.

S/2004 S 7

Discovery [1]
Discovered by	Scott S. Sheppard et al.
Discovery site	Mauna Kea Obs.
Discovery date	12 December 2004
Orbital characteristics [2]
Epoch 9 August 2022 (JD 2459800.5)
Observation arc	15.61 yr (5,703 days)
Semi-major axis	0.1441103 AU (21,559,000 km)
Eccentricity	0.5743875
Orbital period (sidereal)	–3.24 yr (–1181.80 d)
Mean anomaly	94.00208°
Mean motion	0° 18m 16.63s / day
Inclination	165.04992° (to ecliptic)
Longitude of ascending node	14.74072°
Argument of perihelion	127.76280°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	≈6 km[3]
Albedo	0.04 (assumed)[3]
Apparent magnitude	24.5[3]
Absolute magnitude (H)	15.6[2]

S/2004 S 7 is about 6 kilometres in diameter, and orbits Saturn at an average distance of 21,559,000 kilometres in about 1,182 days, at an inclination of 165.0° to the ecliptic, in a retrograde direction and with an eccentricity of 0.574.^[2][4] Denk et al. (2018) tentatively assigned this moon to the Mundilfari dynamical family, but it may instead be more closely related to Thrymr.^[5]

This moon was considered lost^[6] until its recovery was announced on 12 October 2022.^[2]