Helike (moon)
Moon of Jupiter
From Wikipedia, the free encyclopedia
Helike /ˈhɛləkiː/, also known as Jupiter XLV, is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaiʻi led by Scott S. Sheppard in 2003, and given the temporary designation S/2003 J 6.[6][7][8]
Images of Helike by the Canada-France-Hawaii Telescope in February 2003 | |
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard et al. |
| Discovery date | 2003 |
| Designations | |
Designation | Jupiter XLV |
| Pronunciation | /ˈhɛləkiː/[1][2] |
Named after | Ἑλίκη Helicē |
| S/2003 J 6 | |
| Adjectives | Helikean /hɛləˈkiːən/[3] |
| Orbital characteristics[4] | |
| Observation arc | 22 years 2025-12-21 (last obs)[5] |
| 21263000 km | |
| Eccentricity | 0.156 |
| −634.8 days | |
| 36.2° | |
| Inclination | 154.8° |
| 100.3° | |
| 314.7° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
| 4 km | |
| 22.6 | |
| 15.85 (53 obs)[5] | |
Helike is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 20.54 million kilometres in 601.402 days, at an inclination of 155° to the ecliptic (156° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.1375. Its average orbital speed is 2.48 km/s.
It was named in March 2005 after Helike, one of the nymphs that nurtured Zeus (Jupiter) in his infancy on Crete.[9]
Helike belongs to the Ananke group.
