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Jupiter's satellites.

JUPITER'S four bright moons can be identified at any time in June from the diagram at left. For telescopic observers, listed below are interesting events caused by the interplay of the moons and their shadows with Jupiter and 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 by 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.

Lastly, 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 6:32 UT June 1st (2:32 a.m. Eastern Daylight Time), Io disappears into occultation behind Jupiter's limb.


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Title Annotation:Calendar Notes; astronomical observer's guide
Publication:Sky & Telescope
Date:Jun 1, 1993
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