| S/2021 J 1 | |
| Discoverer: | Scott S. Sheppard |
| Discovery Site: | Las Campanas Obs. |
| Discovered: | 12 August 2021 |
| Epoch: | 25 February 2023 (JD 2460000.5) |
| Observation Arc: | 1.06 yr (387 d) |
| Eccentricity: | 0.2460574 |
| Period: | –1.66 yr (–606.99 days) |
| Mean Anomaly: | 312.94753° |
| Mean Motion: | / day |
| Inclination: | 149.75284° |
| Asc Node: | 310.98434° |
| Arg Peri: | 73.05108° |
| Satellite Of: | Jupiter |
| Group: | Ananke group |
| Mean Diameter: | ≈ |
| Magnitude: | 23.9 |
| Abs Magnitude: | 17.3 |
S/2021 J 1 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 5 January 2023, after observations were collected over a long enough time span to confirm the satellite's orbit.
S/2021 J 1 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 NaNe6km, orbital eccentricities between 0.1–0.4, and inclinations between 139–155°. It has a diameter of about for an absolute magnitude of 17.3, making it one of Jupiter's smallest known moons.