EarthSky // // Uncategorized By Bruce McClure Jun 08, 2009

Double shadow transit on the planet Jupiter

Jupiter rises in the southeast at midnight or later. Climbing upward, Jupiter reaches its high point around daybreak. People often look at Jupiter’s 4 major moons in a small telescope. But a high-powered telescope is needed to watch the 2 moon shadows crossing Jupiter’s disk from 3:06 to 5:15 a.m. CDT tomorrow morning.

In June of 2009, the planet Jupiter can’t be seen during the evening hours, because this world won’t rise into the southeast sky till around midnight or later. For the exact time that Jupiter rises into your sky, check the links on our almanac page.

Jupiter climbs upward during the wee hours after midnight, and is pretty much due south by daybreak. If you’re up at or before dawn, you should have little trouble spotting Jupiter. It’s the 4th brightest heavenly body, after the sun, moon and the planet Venus.

In a dark sky, it’s pretty easy to view Jupiter’s 4 major moons through a backyard telescope. In fact, it’s even possible to see these moons with steadily held binoculars. Now and again, a moon might be “missing,” because these moons routinely swing in front of and behind Jupiter.

Enthusiasts with more high-powered telescopes like to watch moon shadows crossing Jupiter’s disk. Starting at 3:06 a.m. tomorrow morning (Tuesday, June 9) Central Daylight Time, the shadows from the moons Io and Ganymede will be crossing Jupiter at the same time, appearing as two small darkish dots. This double shadow transit – or crossing – will end at 5:15 a.m. CDT.

These double shadow transits sometimes recur in periods of 7 days plus a few hours.

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