|Discovered by||Scott S. Sheppard et al.|
|Discovery site||Mauna Kea Obs.|
|Discovery date||6 February 2003 (imaged)|
January 2004 (announced)
|Orbital characteristics |
|Epoch 17 December 2020 (JD 2459200.5)|
|Observation arc||14.22 yr (5,193 d)|
|0.1649635 AU (24,678,190 km)|
|–2.17 yr (–792.00 d)|
|0° 27m 16.361s / day|
|Inclination||146.15464° (to ecliptic)|
S/2003 J 23 is about 2 kilometres in diameter, and orbits Jupiter at an average distance of 24,700 Mm in about 792 days, at an inclination of 146° to the ecliptic, in a retrograde direction and with an eccentricity of 0.321.
This moon was considered lost until late 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 13 January 2021, while additional recovery observations by Sheppard were later published on 27 January 2021.
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.