| S/2003 J 16 | |
| Discovery Ref: |   |
| Discoverer: | Brett J. Gladman John J. Kavelaars Jean-Marc Petit Lynne Allen |
| Discovery Site: | Mauna Kea Obs. |
| Discovered: | 6 February 2003 |
| Orbit Ref: |   |
| Epoch: | 17 December 2020 (JD 2459200.5) |
| Observation Arc: | 15.26 yr (5,574 d) |
| Eccentricity: | 0.3330999 |
| Period: | –1.64 yr (–600.18 d) |
| Mean Anomaly: | 88.24314° |
| Mean Motion: | / day |
| Inclination: | 151.16323° 28.83677° |
| Asc Node: | 83.26365° |
| Arg Peri: | 86.51495° |
| Satellite Of: | Jupiter |
| Group: | Ananke group |
| Mean Diameter: | ≈ |
| Albedo: | 0.04 |
| Magnitude: | 23.3 |
| Abs Magnitude: | 16.3 |
is a natural satellite of Jupiter. It was discovered by a team of astronomers led by Brett J. Gladman in 2003.[1]
is about 2 kilometres in diameter, and orbits Jupiter at an average distance of in 600 days, at an inclination of 151° to the ecliptic (149° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.333. It belongs to the Ananke group of retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.
This moon was once considered lost[2] [3] until September 2010, when it was recovered by Christian Veillet with Canada-France-Hawaii Telescope (CFHT). However, the recovery observations of S/2003 J 16 were not reported by the Minor Planet Center until 2020, when Ashton et al. independently identified the moon in the same CFHT images taken by Veillet back in September 2010. S/2003 J 16 was also identified in observations by Scott Sheppard from March 2017 to May 2018, cumulating a long observation arc of 5,574 days (15 years) since its discovery. The recovery of S/2003 J 16 was formally announced by the Minor Planet Center on 4 November 2020.