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S/2003 J 2

Moon of Jupiter that comes after Praxidike

Field	Value
name	S/2003 J 2
image	2003 J 2 Gladman CFHT annotated.gif
caption	S/2003 J 2 imaged by the Canada-France-Hawaii Telescope during follow-up observations in February 2003
discovery_ref
discoverer	Scott S. Sheppard et al.
discovery_site	Mauna Kea Obs.
discovered	5 February 2003
orbit_ref
epoch	17 December 2020 (JD 2459200.5)
observation_arc	16.42 yr (5,996 d)
earliest_precovery_date	11 December 2001
semimajor	0.1373976 AU
eccentricity	0.2776569
period	–1.65 yr (–602.02 d)
mean_anomaly	114.43587°
mean_motion	/ day
inclination	149.20392° (to ecliptic)
asc_node	50.46976°
arg_peri	224.95527°
satellite_of	Jupiter
group	Ananke group
mean_diameter	≈
albedo	0.04 (assumed)
magnitude	23.2
abs_magnitude	16.7

S/2003 J 2 is a retrograde irregular satellite of Jupiter. The moon was discovered on 5 February 2003 by a team of astronomers from the University of Hawaii led by Scott S. Sheppard and David C. Jewitt, and was later announced on 4 March 2003. It was initially thought to be Jupiter's outermost known moon until recovery observations disproved this in 2020.

S/2003 J 2 is about 2 km in diameter, and orbits Jupiter at an average distance of about 20,600,000 km in roughly 600 days, at an inclination of around 149° to the ecliptic and with an eccentricity of 0.28. The moon was initially assumed to be part of the Pasiphae group, but is now known to be part of the Ananke group after it was recovered in 2020.

S/2003 J 2 and several bright background stars and galaxies imaged by the CFHT in April 2003

The moon was considered lost until 2020, when it was recovered by Sheppard and independently by amateur astronomer Kai Ly. The recovery of the moon was announced by the Minor Planet Center on 26 January 2021.

References

[http://www.cbat.eps.harvard.edu/iauc/08000/08087.html IAUC 8087: ''Satellites of Jupiter''] 2003 March 4 (discovery)
Sheppard, Scott S.. (2003). "An abundant population of small irregular satellites around Jupiter". [[Nature (journal).
Hecht, Jeff. (2021-01-11). "Amateur Astronomer Finds "Lost" Moons of Jupiter". Sky & Telescope.
[http://www.minorplanetcenter.net/mpec/K03/K03E11.html MPEC 2003-E11: ''S/2003 J 1, 2003 J 2, 2003 J 3, 2003 J 4, 2003 J 5, 2003 J 6, 2003 J 7''] 2003 March 4 (discovery and ephemeris)
Beatty, Kelly. (4 April 2012). "Outer-Planet Moons Found — and Lost". Sky & Telescope.
(9 March 2017). "The Orbits of Jupiter's Irregular Satellites". The Astronomical Journal.
(28 September 2012). "Irregular Satellites of the Outer Planets: Orbital Uncertainties and Astrometric Recoveries in 2009–2011". The Astronomical Journal.
Sheppard, Scott S.. (2017). "New Moons of Jupiter Announced in 2017".
[https://sites.google.com/carnegiescience.edu/sheppard/moons/jupitermoons S.S. Sheppard (2019), Moons of Jupiter, ''Carnegie Science'', on line]

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