Halimede (moon)
Halimede /hæləˈmiːdiː/, or Neptune IX, is a retrograde irregular satellite of Neptune. It was discovered by Matthew J. Holman, John J. Kavelaars, Tommy Grav, Wesley C. Fraser and Dan Milisavljevic on August 14, 2002.
Set of stacked discovery images from August 2003, showing Halimede among trailed stars | |
| Discovery | |
|---|---|
| Discovered by |
|
| Discovery date | August 14, 2002 |
| Designations | |
Designation | Neptune IX |
| Pronunciation | /hæləˈmiːdiː/ |
Named after | Ἁλιμήδη Halimēdē |
Alternative names | S/2002 N 1 |
| Adjectives | Halimedean /ˌhæləməˈdiːən/ |
| Orbital characteristics | |
| Epoch June 10, 2003 | |
Semi-major axis | 16,611,000 km |
| Eccentricity | 0.2646 |
Orbital period (sidereal) | 1879.08 d (5.14 a) |
| Inclination | 134.1° |
| Physical characteristics | |
Mean diameter | 62 km (for albedo 0.04) |
| Albedo | 0.04 (assumed) |
Spectral type | neutral (grey) B-V=0.73 R-V=0.35 |
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