Harpalyke (moon)
Harpalyke /hɑːrˈpæləkiː/, also known as Jupiter XXII, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2000, and given the temporary designation S/2000 J 5. In August 2003, the moon was named after Harpalyke, the incestuous daughter of Clymenus, who in some accounts was also a lover of Zeus (Jupiter).
Harpalyke imaged by the Canada-France-Hawaii Telescope in December 2001 | |
| Discovery | |
|---|---|
| Discovered by | Scott S. Sheppard David C. Jewitt Yanga R. Fernandez Eugene A. Magnier |
| Discovery site | Mauna Kea Observatory |
| Discovery date | 23 November 2000 |
| Designations | |
Designation | Jupiter XXII |
| Pronunciation | /hɑːrˈpæləkiː/ |
Named after | Ἁρπαλύκη Harpălykē |
Alternative names | S/2000 J 5 |
| Adjectives | Harpalykean /hɑːrpələˈkiːən/ |
| Orbital characteristics | |
| Epoch 17 December 2020 (JD 2459200.5) | |
| Observation arc | 17.39 yr (6,350 days) |
Semi-major axis | 0.1422492 AU (21,280,180 km) |
| Eccentricity | 0.1602677 |
Orbital period (sidereal) | –634.19 d |
Mean anomaly | 321.08380° |
Mean motion | 0° 34m 3.555s / day |
| Inclination | 148.29788° (to ecliptic) |
Longitude of ascending node | 92.54746° |
| 193.28018° | |
| Satellite of | Jupiter |
| Group | Ananke group |
| Physical characteristics | |
Mean diameter | 4 km |
| Albedo | 0.04 (assumed) |
| 22.2 | |
| 15.9 | |
Harpalyke belongs to the Ananke group, believed to be the remnants of a break-up of a captured heliocentric asteroid. It is about 4 kilometres in diameter and appears grey (color index R-V=0.43), similar to C-type asteroids. The satellite orbits Jupiter at an average distance of 21,064,000 km in 634.19 days, at an inclination of 147° to the ecliptic (147° to Jupiter's equator) with an eccentricity of 0.2441.