S/2018 J 3

S/2018 J 3 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard on 12 May 2018, using the 6.5-meter Magellan-Baade Telescope at Las Campanas Observatory, Chile. It was announced by the Minor Planet Center on 19 January 2023, after observations were collected over a long enough time span to confirm the satellite's orbit.[1]

S/2018 J 3
Discovery[1]
Discovered byScott S. Sheppard
Discovery siteLas Campanas Obs.
Discovery date12 May 2018
Orbital characteristics[1][2]
Epoch 25 February 2023 (JD 2460000.5)
Observation arc4.35 yr (1590 d)
0.1525861 AU (22,826,560 km)
Eccentricity0.2731285
–1.93 yr (–704.56 days)
16.59790°
0° 30m 39.453s / day
Inclination164.90043° (to ecliptic)
240.00514°
296.52870°
Satellite ofJupiter
GroupCarme group
Physical characteristics
Mean diameter
≈1 km[3]
23.9[3]
17.3[1]

    S/2018 J 3 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 0.2–0.3, and inclinations between 163–166°.[3] It has a diameter of about 1 km (0.62 mi) for an absolute magnitude of 17.3, making it one of Jupiter's smallest known moons.[3]

    References
    1. "MPEC 2023-B38 : S/2018 J 3". Minor Planet Electronic Circulars. Minor Planet Center. 19 January 2023. Retrieved 20 January 2023.
    2. "Planetary Satellite Discovery Circumstances". JPL Solar System Dynamics. NASA. Retrieved 10 January 2023.
    3. Sheppard, Scott S. "Moons of Jupiter". Earth & Planets Laboratory. Carnegie Institution for Science. Retrieved 10 January 2023.


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