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S/2003 J 12

Moon of Jupiter

Field	Value
name	S/2003 J 12
image	2003 J 12 Gladman CFHT annotated.gif
caption	S/2003 J 12 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	8 February 2003
orbit_ref
epoch	17 December 2020 (JD 2459200.5)
observation_arc	9.65 yr (3,525 d)
earliest_precovery_date	10 December 2001
semimajor	0.1441046 AU
eccentricity	0.3657005
period	–1.77 yr (–646.64 d)
mean_anomaly	295.36521°
mean_motion	/ day
inclination	154.69036° (to ecliptic)
asc_node	127.52296°
arg_peri	86.84711°
satellite_of	Jupiter
group	Ananke group
physical_ref
mean_radius
mass
density	2.6 g/cm3 (assumed)
albedo	0.04 (assumed)
magnitude	23.9
abs_magnitude	17.0
(R)

(R)

S/2003 J 12 is a natural satellite of Jupiter, and is one of the smallest known natural satellites in the Solar System. It was discovered by a team of astronomers from the University of Hawaiʻi led by Scott S. Sheppard in 2003.

S/2003 J 12 is about 2.4 km in diameter, and orbits Jupiter at an average distance of 21,600 Mm in 647 days, at an inclination of 155° to the ecliptic, in a retrograde direction and with an eccentricity of 0.366. It was initially thought to the innermost of the retrograde satellites of Jupiter, but recovery observations have shown that it is an ordinary member of the Ananke group.

Blink animation of S/2003 J 12 in CFHT precovery images from December 2001

Recovery images of S/2003 J 12 taken by the CFHT in August 2011

This moon was considered lost until late 2020, when it was recovered in archival CFHT images from 2001–2011 by amateur astronomer Kai Ly. The recovery of the moon was announced by the Minor Planet Center on 13 January 2021.

References

Daniel W. E. Green. (March 7, 2003). "IAUC 8089: Satellites of Jupiter". [[International Astronomical Union]].
[https://www.minorplanetcenter.net/mpec/K03/K03E29.html MPEC 2003-E29: S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6] April 3, 2003 (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".
Hecht, Jeff. (2021-01-11). "Amateur Astronomer Finds "Lost" Moons of Jupiter". Sky & Telescope.
[https://sites.google.com/carnegiescience.edu/sheppard/moons/jupitermoons S.S. Sheppard (2019), Moons of Jupiter, ''Carnegie Science'', on line]
(24 March 2022). "New ephemerides of outer planetary satellites". Monthly Notices of the Royal Astronomical Society.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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