Pasiphaë (moon)
 |
|
| Discovery | |
|---|---|
| Discovered by | P. J. Melotte |
| Discovery date | January 27, 1908 |
| Orbital characteristics | |
| Periapsis | 16,980,250 km |
| Apoapsis | 31,209,300 km |
|
Mean orbit radius
|
24,094,770 km |
| Eccentricity | 0.2953 |
| 764.082032 d (2.092 a) | |
|
Average orbital speed
|
2.242 km/s |
| Inclination | 145.24° (to the ecliptic) 143.04° (to Jupiter's equator) |
| Satellite of | Jupiter |
| Physical characteristics | |
|
Mean radius
|
20 km 18 km |
| ~11,300 km² | |
| Volume | ~113,000 km³ |
| Mass | 3.0×1017kg |
|
Mean density
|
2.6 g/cm³ (assumed) |
| ~0.022 m/s2 (0.002 g) | |
| ~0.036 km/s | |
| Albedo | 0.04 (assumed) 0.10 |
| Temperature | ~124 K |
Pasiphae (/pəˈsɪfə.iː/ pə-SIF-ə-ee;Greek: Πασιφάη; formerly Pasiphaë) is a retrograde irregular satellite of Jupiter. It was discovered in 1908 by Philibert Jacques Melotte and later named after the mythological Pasiphaë, wife of Minos and mother of the Minotaur from Greek legend.
It was first spotted on a plate taken at the Royal Greenwich Observatory on the night of February 28, 1908. Inspection of previous plates found it as far back as January 27. It received the provisional designation 1908 CJ, as it was not clear whether it was an asteroid or a moon of Jupiter. The recognition of the latter case came by April 10.
Pasiphae did not receive its present name until 1975; before then, it was simply known as Jupiter VIII. It was sometimes called "Poseidon" between 1955 and 1975.
Pasiphae orbits Jupiter on a high eccentricity and high inclination retrograde orbit. It gives its name to the Pasiphae group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 million km, and with inclinations ranging between 144.5° and 158.3°. The orbital elements are as of January 2000. They are continuously changing due to solar and planetary perturbations. The diagram illustrates its orbit in relation to other retrograde irregular satellites of Jupiter. The eccentricity of selected orbits is represented by the yellow segments (extending from the pericentre to the apocentre). The outermost regular satellite Callisto is located for reference.
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