Hermippe (moon)
Hermippe /hɜːrˈmɪpiː/, or Jupiter XXX, is a natural satellite of Jupiter. It was discovered concurrently with Eurydome by a team of astronomers from the Institute for Astronomy of the University of Hawaii led by David Jewitt and Scott S. Sheppard and Jan Kleyna in 2001, and given the temporary designation S/2001 J 3.
Discovery image of Hermippe by the Canada-France-Hawaii Telescope in December 2001 | |
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard David C. Jewitt Jan T. Kleyna |
| Discovery site | Mauna Kea Observatory |
| Discovery date | 9 December 2001 |
| Designations | |
Designation | Jupiter XXX |
| Pronunciation | /hɜːrˈmɪpiː/ |
Named after | Ἑρμίππη Hermippē |
Alternative names | S/2001 J 3 |
| Adjectives | Hermippean /hɜːrmɪˈpiːən/ |
| Orbital characteristics | |
| Epoch 17 December 2020 (JD 2459200.5) | |
| Observation arc | 15.29 yr (5,586 days) |
Semi-major axis | 0.1381428 AU (20,665,870 km) |
| Eccentricity | 0.1982520 |
Orbital period (sidereal) | –606.93 d |
Mean anomaly | 169.67605° |
Mean motion | 0° 35m 35.347s / day |
| Inclination | 146.76001° (to ecliptic) |
Longitude of ascending node | 37.24213° |
| 356.27211° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
Mean diameter | 4 km |
| Albedo | 0.04 (assumed) |
| 22.1 | |
| 15.5 | |
Hermippe is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 21,500,000 kilometers in about 630 days, at an inclination of 151° to the ecliptic (149° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.2290.
It was named in August 2003 by the IAU, after Hermippe, a lover of Zeus (Jupiter).
Hermippe belongs to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 gigametres (0.152 astronomical units), at inclinations of roughly 150°.