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Moon of Jupiter From Wikipedia, the free encyclopedia
S/2003 J 9 is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.[1]
Discovery [1] | |
---|---|
Discovered by | Scott S. Sheppard David C. Jewitt Jan T. Kleyna Yanga R. Fernández |
Discovery site | Mauna Kea Obs. |
Discovery date | 6 February 2003 |
Orbital characteristics [2] | |
Epoch 17 December 2020 (JD 2459200.5) | |
Observation arc | 15.19 yr (5,545 d) |
0.1615575 AU (24,168,660 km) | |
Eccentricity | 0.1701900 |
2.10 yr (767.60 d) | |
109.89836° | |
0° 28m 8.381s / day | |
Inclination | 166.33403° (to ecliptic) 13.66597° (retrograde) |
130.59522° | |
45.62861° | |
Satellite of | Jupiter |
Group | Carme group |
Physical characteristics | |
≈1 km[3] | |
Albedo | 0.04 (assumed)[3] |
23.7[3] | |
16.9[2] | |
S/2003 J 9 is about 1 kilometre in diameter, and orbits Jupiter at an average distance of 0.162 AU (24,200,000 km) in 767.60 days, at an inclination of 166.3° to the ecliptic (166° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.17.
It belongs to the Carme group, made up of irregular retrograde moons orbiting Jupiter at a distance ranging between 23 and 24 Gm and at an inclination of about 165°.
This moon was once considered lost[4][5][6][7] until November 2020, when the Minor Planet Center announced the recovery of S/2003 J 9 by Scott Sheppard in observations from September 2011 to April 2018.[2]
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