S/2004 S 12 Explained

S/2004 S 12
Discoverer:Scott S. Sheppard et al.
Discovery Site:Mauna Kea Obs.
Discovered:12 December 2004
Epoch:9 August 2022 (JD 2459800.5)
Observation Arc:15.61 yr (5,703 days)
Eccentricity:0.3711930
Period:–2.86 yr (–1044.50 d)
Mean Anomaly:326.59167°
Mean Motion: / day
Inclination:163.85743°
Asc Node:330.73760°
Arg Peri:111.13920°
Satellite Of:Saturn
Group:Norse group
Mean Diameter:
Albedo:0.04
Magnitude:24.8
Abs Magnitude:15.9

S/2004 S 12 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 12 is about 5 kilometres in diameter, and orbits Saturn at an average distance of 19,855,000 kilometres in about 1,044 days, at an inclination of 163.9° to the ecliptic, in a retrograde direction and with an eccentricity of 0.371.

This moon was considered lost[1] until its recovery was announced on 12 October 2022. (In 2021, it had also been found in Canada-France-Hawaii Telescope observations from 2019.)[2]

References

Notes and References

  1. Jacobson . B. . Brozović . M. . B. . Gladman . M. . Alexandersen . P. D. . Nicholson . C. . Veillet . 28 September 2012 . Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011 . The Astronomical Journal . 144 . 5 . 132 . 10.1088/0004-6256/144/5/132 . 2012AJ....144..132J . 123117568 . free .
  2. Edward . Ashton . Gladman, Brett . Beaudoin, Matthew . Evidence for a Recent Collision in Saturn's Irregular Moon Population. The Planetary Science Journal. August 2021. 2. 4. 12. 10.3847/PSJ/ac0979. 2021PSJ.....2..158A . free.