S/2022 J 2

S/2022 J 2 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard on 15 October 2022 using the 6.5-meter Magellan-Baade Telescope at Las Campanas Observatory, Chile. It was announced by the Minor Planet Center on 22 February 2023, after observations were collected over a long enough time span to confirm the satellite's orbit.[1]

S/2022 J 2
Discovery[1]
Discovered byScott S. Sheppard
Discovery siteLas Campanas Obs.
Discovery date15 October 2022
Orbital characteristics[1][2]
Epoch 25 February 2023 (JD 2460000.5)
0.1498228 AU (22,413,170 km)
Eccentricity0.1820416
–1.88 yr (–685.51 days)
257.85858°
0° 31m 30.576s / day
Inclination165.39031° (to ecliptic)
148.74603°
135.21875°
Satellite ofJupiter
GroupCarme group
Physical characteristics
Mean diameter
≈1 km[3]
Albedo0.04 (assumed)[3]
23[3]
17.6[1]

    S/2022 J 2 is part of the Carme group, a tight cluster of retrograde irregular moons of Jupiter that follow similar orbits to Carme at semi-major axes between 22–24 million km (14–15 million mi), orbital eccentricities between 0.2 and 0.3, and inclinations between 163 and 166°.[3] With a diameter of about 1 km (0.62 mi) for an absolute magnitude of 17.6, it is one of Jupiter's smallest known moons with confirmed orbits.[3]

    References
    1. "MPEC 2023-D45 : S/2022 J 2". Minor Planet Electronic Circulars. Minor Planet Center. 22 February 2023. Retrieved 22 February 2023.
    2. "Planetary Satellite Discovery Circumstances". JPL Solar System Dynamics. NASA. Retrieved 22 February 2023.
    3. Sheppard, Scott S. "Moons of Jupiter". Earth & Planets Laboratory. Carnegie Institution for Science. Retrieved 22 February 2023.


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