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Jupiter's Satellites.

Jupiter's four bright moons can be identified at any time in November from the diagram at right. For telescopic observers, listed below are interesting happenings involving the moons and Jupiter or its shadow.

The first columns give the date and time of the event in Universal Time. Next is the satellite involved: I for Io, II Europa, III Ganymede, or IV Callisto, followed by the type of event: Oc for an occultation of the satellite behind Jupiter's limb, Ec for an eclipse by Jupiter's shadow, Tr for a transit of the satellite across the planet's face, or Sh for the satellite casting its tiny black shadow onto Jupiter.

An occultation or eclipse begins when the satellite disappears (D) and ends when it reappears (R). A transit or shadow passage begins at ingress (I) and ends at egress (E).

For example, the first entry shows that at 10:38 UT November 1st (2:38 a.m. Pacific Standard Time) Ganymede disappears into occultation behind Jupiter's disk. It reappears nearly three hours later.

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Publication:Sky & Telescope
Article Type:Brief Article
Geographic Code:1USA
Date:Nov 1, 1999
Words:171
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