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S/2018 J 3

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S/2018 J 3
Discovery^[1]
Discovered by	Scott S. Sheppard
Discovery site	Las Campanas Obs.
Discovery date	12 May 2018
Orbital characteristics^[1]^[2]
Epoch 25 February 2023 (JD 2460000.5)
Observation arc	4.35 yr (1590 d)
Semi-major axis	0.1525861 AU (22,826,560 km)
Eccentricity	0.2731285
Orbital period (sidereal)	–1.93 yr (–704.56 days)
Mean anomaly	16.59790°
Mean motion	0° 30^m 39.453^s / day
Inclination	164.90043° (toecliptic)
Longitude of ascending node	240.00514°
Argument of perihelion	296.52870°
Satellite of	Jupiter
Group	Carme group
Physical characteristics
Mean diameter	≈1 km^[3]
Apparent magnitude	23.9^[3]
Absolute magnitude (H)	17.3^[1]

S/2018 J 3 is a small outer natural satelliteofJupiter discovered by Scott S. Sheppard on 12 May 2018, using the 6.5-meter Magellan-Baade TelescopeatLas 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 is part of the Carme group, a tight cluster of retrograde irregular moons of Jupiter that follow similar orbits to Carmeatsemi-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

^ ^a ^b ^c ^d "MPEC 2023-B38 : S/2018 J 3". Minor Planet Electronic Circulars. Minor Planet Center. 19 January 2023. Retrieved 20 January 2023.

^ "Planetary Satellite Discovery Circumstances". JPL Solar System Dynamics. NASA. Retrieved 10 January 2023.

^ ^a ^b ^c ^d Sheppard, Scott S. "Moons of Jupiter". Earth & Planets Laboratory. Carnegie Institution for Science. Retrieved 10 January 2023.

v t e Moons of Jupiter
Listed in increasing approximate distance from Jupiter
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto	Themisto
Himalia group (9)	Leda Ersa S/2018 J 2 Himalia Pandia Lysithea Elara S/2011 J 3 Dia
Carpo group (2)	S/2018 J 4 Carpo
Valetudo	Valetudo
Ananke group (26)	Euporie Jupiter LV Eupheme S/2021 J 3 Jupiter LII Jupiter LIV Mneme Euanthe S/2003 J 16 Harpalyke Orthosie S/2022 J 3 Helike S/2021 J 2 Praxidike Jupiter LXIV S/2021 J 1 S/2003 J 12 Jupiter LXVIII Thelxinoe Thyone S/2003 J 2 Ananke Iocaste Hermippe Jupiter LXX
Carme group (30)	S/2022 J 1 S/2022 J 2 S/2016 J 3 Pasithee Jupiter LXIX S/2021 J 6 S/2003 J 24 Chaldene Jupiter LXIII Isonoe S/2021 J 4 Kallichore Erinome Kale Eirene Aitne Eukelade Arche Taygete Jupiter LXXII Carme Herse Jupiter LXI Jupiter LI S/2003 J 9 Jupiter LXVI Kalyke S/2018 J 3 S/2021 J 5 S/2003 J 10
Pasiphae group (18)	Philophrosyne Eurydome Jupiter LVI S/2003 J 4 S/2016 J 4 Jupiter LXVII Hegemone Pasiphae Sponde Megaclite Cyllene Sinope Jupiter LIX Aoede Autonoe Callirrhoe S/2003 J 23 Kore
See also	Rings of Jupiter Jupiter's moons in fiction
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