S/2021 J 5

S/2021 J 5 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard, David J. Tholen, and Chad Trujillo on 5 September 2021, using the 8.2-meter Subaru Telescope at Mauna Kea Observatory, Hawaii. 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/2021 J 5

Discovery[1]
Discovered by	Scott S. Sheppard David J. Tholen Chad Trujillo
Discovery site	Mauna Kea Obs.
Discovery date	5 September 2021
Orbital characteristics[1][2]
Epoch 25 February 2023 (JD 2460000.5)
Observation arc	1.11 yr (405 d)
Semi-major axis	0.1526210 AU (22,831,780 km)
Eccentricity	0.2001547
Orbital period (sidereal)	–1.93 yr (–704.80 days)
Mean anomaly	329.67857°
Mean motion	0° 30m 38.821s / day
Inclination	163.17500° (to ecliptic)
Longitude of ascending node	249.95820°
Argument of perihelion	32.01323°
Satellite of	Jupiter
Group	Carme group
Physical characteristics
Mean diameter	≈2 km[3]
Apparent magnitude	23.6[3]
Absolute magnitude (H)	16.8[1]

S/2021 J 5 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 2 km (1.2 mi) for an absolute magnitude of 16.8.^[3]

References

1. "MPEC 2023-B41 : S/2021 J 5". 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.