S/2021 J 2
S/2021 J 2 is a small outer natural satellite of Jupiter discovered by Scott S. Sheppard on 12 August 2021, 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.
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard |
| Discovery site | Las Campanas Obs. |
| Discovery date | 12 August 2021 |
| Orbital characteristics | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Observation arc | 1.06 yr (387 d) |
| 0.1413164 AU (21,140,630 km) | |
| Eccentricity | 0.3413342 |
| –1.72 yr (–627.96 days) | |
| 320.08120° | |
| 0° 34m 23.822s / day | |
| Inclination | 150.11397° (to ecliptic) |
| 340.99094° | |
| 71.71210° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
Mean diameter | ≈1 km |
| 24.0 | |
| 17.3 | |
S/2021 J 2 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 0.1–0.4, and inclinations between 139–155°. 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.
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