S/2004 S 13

S/2004 S 13

Discovery
Discovered by	Scott S. Sheppard et al.
Discovery site	Mauna Kea Obs.
Discovery date	12 December 2004
Orbital characteristics
Epoch 9 August 2022 (JD 2459800.5)
Observation arc	15.60 yr (5,699 days)
Semi-major axis	0.1235696 AU (18,486,000 km)
Eccentricity	0.2713528
Orbital period (sidereal)	–2.57 yr (–938.36 d)
Mean anomaly	318.38441°
Mean motion	0° 23m 1.133s / day
Inclination	166.99515° (to ecliptic)
Longitude of ascending node	235.01103°
Argument of perihelion	18.66111°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	≈6 km
Albedo	0.04 (assumed)
Apparent magnitude	24.5
Absolute magnitude (H)	16.3

S/2004 S 13 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 9 March 2005.

S/2004 S 13 is about 6 kilometres in diameter, and orbits Saturn at an average distance of 18,486,000 kilometres in about 938 days, at an inclination of 167.0° to the ecliptic, in a retrograde direction and with an eccentricity of 0.271.

This moon was considered lost until its recovery was announced on 12 October 2022.

References

• Institute for Astronomy Saturn Satellite Data
• Jewitt's New Satellites of Saturn page
• MPEC 2005-J13: Twelve New Satellites of Saturn, 3 May 2005 (discovery and ephemeris)