S/2017 J 10

S/2017 J 10 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard on 23 March 2017, using the 4.0-meter Víctor M. Blanco Telescope at Cerro Tololo Observatory, Chile. It was announced by the Minor Planet Center on 30 April 2025, after observations were collected over a long enough time span to confirm the satellite's orbit.^[1]

S/2017 J 10

Discovery images of S/2017 J 10 from the 4.0-m Victor M. Blanco Telescope's Dark Energy Camera (DECam) at Cerro Tololo Observatory in March 2023.
Discovery
Discovered by	Scott S. Sheppard
Discovery site	Cerro Tololo Obs.
Discovery date	23 March 2017
Orbital characteristics
Epoch 5 May 2025 (JD 2460800.5)
Earliest precovery date	27 February 2003
Semi-major axis	0.14088302 AU (21,075,800 km)
Eccentricity	0.2587634
Orbital period (sidereal)	−645.09 d
Mean anomaly	62.49100°
Mean motion	0° 33m 29.014s / day
Inclination	145.57259° (to ecliptic)
Longitude of ascending node	38.65145°
Argument of perihelion	239.09093°
Satellite of	Jupiter
Group	Ananke group
Physical characteristics
Mean diameter	1 km
Albedo	0.28 (assumed)
Apparent magnitude	24.1
Absolute magnitude (H)	17.0

S/2017 J is part of the Ananke group, a cluster of retrograde irregular moons of Jupiter that follow similar orbits to Ananke at semi-major axes between 19–22 million km (12–14 million mi), orbital eccentricities between 0.1 and 0.4, and inclinations between 139 and 155°. It has a diameter of about 1 km (0.62 mi) for an absolute magnitude of 17.0.^[2]

See also

• Moons of Jupiter