S/2011 J 1

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S/2011 J 1
Discovered by Scott S. Sheppard
Discovery date 27 September 2011
Orbital characteristics
Mean orbit radius
20 155 290 km
Eccentricity 0.2963
582.22 days
Inclination 162.83°
Physical characteristics
Mean radius
≈ 0.5 km

S/2011 J 1 is a natural satellite of Jupiter. It was discovered by Scott Sheppard in 2011.[1][2] It does not seem to belong to any group.

This moon has not been seen since its discovery in 2011 and is currently considered lost.[3][4][5] Follow-up observations in 2018 are planned to secure its orbit.[6]


  1. ^ MPEC 2012-B97 : S/2011 J 1 AND S/2011 J 2 2012 Jan. 29 (issued)
  2. ^ Jupiter's Known Satellites
  3. ^ Beatty, Kelly (4 April 2012). "Outer-Planet Moons Found — and Lost". www.skyandtelescope.com. Sky & Telescope. Retrieved 27 June 2017. 
  4. ^ 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. 
  5. ^ 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. 
  6. ^ Sheppard, Scott S. (2017). "New Moons of Jupiter Announced in 2017". home.dtm.ciw.edu. Retrieved 27 June 2017. We likely have all of the lost moons in our new observations from 2017, but to link them back to the remaining lost 2003 objects requires more observations a year later to confirm the linkages, which will not happen until early 2018. ... There are likely a few more new moons as well in our 2017 observations, but we need to reobserve them in 2018 to determine which of the discoveries are new and which are lost 2003 moons.