S/2004 S 7

Summary

S/2004 S 7
Discovery[1]
Discovered bySheppard et al.
Discovery date2005
Orbital characteristics[2]
19800000 km
Eccentricity0.580
−1103 days
Inclination165.1°
Satellite ofSaturn
GroupNorse group?
Physical characteristics
Mean diameter
6+50%
−30%
 km
24.5

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 May 4, 2005 from observations taken between December 12, 2004 and March 8, 2005.

S/2004 S 7 is about 6 kilometres in diameter, and orbits Saturn at an average distance of 20,999 Mm in 1140.24 days, at an inclination of 166° to the ecliptic (166° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.5299.[3]

This moon has not been seen since its discovery and is currently considered lost.[4][5][6]

References

  1. ^ Discovery Circumstances from JPL
  2. ^ S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
  3. ^ Jacobson, R.A. (2007) SAT272 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Archived from the original on 2011-08-22. Retrieved 2008-01-20.
  4. ^ Beatty, Kelly (4 April 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Archived from the original on 2017-06-07. Retrieved 27 June 2017.
  5. ^ Brozović, Marina; Jacobson, Robert A. (9 March 2017). "The Orbits of Jupiter's Irregular Satellites". The Astronomical Journal. 153 (4): 147. Bibcode:2017AJ....153..147B. doi:10.3847/1538-3881/aa5e4d.
  6. ^ Jacobson, B.; Brozović, M.; Gladman, B.; Alexandersen, M.; Nicholson, P. D.; Veillet, C. (28 September 2012). "Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011". The Astronomical Journal. 144 (5): 132. Bibcode:2012AJ....144..132J. doi:10.1088/0004-6256/144/5/132.
  • Institute for Astronomy Saturn Satellite Data
  • Jewitt's New Satellites of Saturn page
  • MPEC 2005-J13: Twelve New Satellites of Saturn May 3, 2005 (discovery and ephemeris)