| Herse | |
| Adjective: | Hersean |
| Named After: | Ἕρση Hersē |
| Discoverer: | Brett J. Gladman John J. Kavelaars Jean-Marc Petit Lynne Allen |
| Discovered: | 2003 |
| Mpc Name: | Jupiter L |
| Alt Names: | S/2003 J 17 |
| Orbit Ref: |  [1] |
| Inclination: | 164.2° |
| Eccentricity: | 0.200 |
| Arg Peri: | 355.7° |
| Asc Node: | 329.0° |
| Mean Anomaly: | 41.90° |
| Period: | −715.4 days |
| Satellite Of: | Jupiter |
| Group: | Carme group |
| Magnitude: | 23.4 |
| Mean Diameter: | 2 km |
Herse, or Jupiter L, previously known by its provisional designation of , is a natural satellite of Jupiter. It was discovered on 8 February 2003 by the astronomers Brett J. Gladman, John J. Kavelaars, Jean-Marc Petit, and Lynne Allen and also by a team of astronomers at the University of Hawaii.[2] [3] It was named after Herse 'dew', by some accounts a daughter of Zeus and Selene the moon in Greek mythology,[4] on 11 November 2009.[5] [6] Ersa (Jupiter LXXI) is also named for the same mythological figure.
Herse is about 2 kilometres in diameter, and orbits Jupiter at an average distance of 22,134,000 km in 672.752 days, at a mean inclination of 165° to the ecliptic, in a retrograde direction and with a mean eccentricity of 0.2493.[7]
It is a member of the Carme group, made up of irregular retrograde moons orbiting Jupiter at a distance ranging between 23 and 24 Gm and at an inclination of about 165°.