S/2004 S 7

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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.[1]

This moon has not been seen since its discovery in 2004 and is currently considered lost.[2][3][4]

References[edit]

  1. ^ Jacobson, R.A. (2007) SAT272 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-20. 
  2. ^ Beatty, Kelly (4 April 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Retrieved 27 June 2017. 
  3. ^ Brozović, Marina; Jacobson, Robert A. (9 March 2017). "The Orbits of Jupiter's Irregular Satellites". The Astronomical Journal. 153 (4). Bibcode:2017AJ....153..147B. doi:10.3847/1538-3881/aa5e4d. 
  4. ^ 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). Bibcode:2012AJ....144..132J. doi:10.1088/0004-6256/144/5/132. Retrieved 27 June 2017.