S/2022 J 1

S/2022 J 1
Discovery
Discovered by	Scott S. Sheppard
Discovery site	Cerro Tololo Obs.
Discovery date	30 August 2022
Orbital characteristics
	Epoch 31 March 2024 (JD 2460400.5)
Observation arc	20.62 yr (7,530 d)
Earliest precovery date	24 February 2003
Semi-major axis	0.1588863 AU (23,769,050 km)
Eccentricity	0.1357222
Orbital period (sidereal)	–2.05 yr (–748.64 days)
Mean anomaly	184.22280°
Mean motion	0° 28m 51.136s / day
Inclination	165.94051° (to ecliptic)
Longitude of ascending node	51.07021°
Argument of perihelion	334.92072°
Satellite of	Jupiter
Group	Carme group
Physical characteristics
Mean diameter	≈2 km
Albedo	0.04 (assumed)
Apparent magnitude	23.8 (average)
Absolute magnitude (H)	17.0

S/2022 J 1 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard on 30 August 2022, using the 4.0-meter Víctor M. Blanco Telescope at Cerro Tololo 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 1 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°.^[4] It has a diameter of about 2 km (1.2 mi) for an absolute magnitude of 17.0.^[4] The moon has been observed for over 20 years, with the earliest known observation on 24 February 2003.^[2]

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