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PostPosted: Tue Feb 07, 2017 2:40 pm 
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Joined: Thu Oct 13, 2011 12:53 pm
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Location: Maple Shade, NJ
A Sky & Telescope press release about Friday's eclipse...

Skygazers can enjoy a special kind of lunar eclipse taking place on Friday night, February 10th. Instead of plunging into the dark inner core of Earth's shadow (called the umbra), the Moon will pass deeply into Earth's dusky outer shadow, the penumbra. Its northern edge will miss the umbra by only about 100 miles (160 km), or 3% of the Moon’s diameter. In fact, were the Moon to slide just 27 miles (44 km) closer, the entire lunar disk would briefly lie inside the penumbra.

The shading will begin to show on the Moon’s left side. In North America, only from the northeastern U.S. and eastern Canada will the Moon be well up in time to watch for this. Any haze or thin cloudiness will make seeing this early onset more difficult. With time, the dusky shading will become more prominent, and as mid-eclipse approaches, the lopsidedness of the Moon’s illumination will be totally obvious. Watch the shading shift and become more concentrated toward the northern limb, the portion of the Moon that is passing closest to the umbra.

Unlike a total eclipse, there's no expectation of any reddening from the penumbral shadow.

Joe Stieber

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