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Pasiphaë (moon)

Pasiphaë
Discovery
Discovered by P. J. Melotte
Discovered on January 27, 1908
Orbital characteristics
Mean radius 23,624,000 km
Eccentricity 0.4090
Orbital period 743.63 d
Inclination 151.431°
Is a satellite of Jupiter
Physical characteristics
Mean diameter 60 km
Mass 3.0×1017 kg
Mean density 2.6 g/cm3
Surface gravity 0.022 m/s2
Escape velocity 0.036 km/s
Rotation period  ?
Axial tilt  ?°
Albedo 0.04
Surface temp. ~171 K
Atmospheric pressure no atmosphere

Pasiphaë (pa-sif'-a-ee, Greek Πασιφάη) is a moon of Jupiter. It was discovered in 1908 by Philibert Jacques Melotte and later named after the mythological Pasiphae, wife of Minos and mother of the Minotaur from Greek legend.

It gives its name to the Pasiphaë group, irregular retrograde moons orbiting Jupiter at distances ranging between 22.8 and 24.1 Gm, and with inclinations ranging between 144.5° and 158.3°.

Pasiphaë did not receive its present name until 1975; before then, it was simply known as Jupiter VIII. It was sometimes called "Poseidon".

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 since it was not clear whether it was an asteroid or a moon of Jupiter. The recognition of the latter case came by April 10.

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Last updated: 07-15-2005 10:59:57
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