The Sky This Week: July 15 – July 17
Friday, July 15
For observers in North America, the Moon appears 3° above Saturn this evening. The ruddy 1st-magnitude star Antares in Scorpius the Scorpion lies 10° below the Moon while Mars blazes well to the trio’s right.
Saturday, July 16
If you like observing challenges, tonight is your night. Mercury passes just 0.5° (the diameter of a Full Moon) north of Venus in the early evening sky. From 40° north latitude, the two lie less than 4° high in the west-northwest 20 minutes after sunset. With a flat horizon and pristine skies, you might just glimpse the pair through binoculars. At magnitude –3.9, Venus will be the easier of the two to spot (Mercury glows at magnitude –1.0).
Sunday, July 17
Observers of the outer solar system should target Uranus this week before the Moon sheds its unwanted light into the predawn sky. The best time to look for it is shortly before twilight begins around 4 a.m. local daylight time. Uranus then lies 40° high in the northeast among the background stars of Pisces the Fish. This morning, use binoculars to find the magnitude 5.8 planet about 4° west of 4th-magnitude Omicron (o) Piscium and 3° north of 5th-magnitude Mu (m) Psc. A telescope reveals Uranus’ blue-green disk, which spans 3.5″.
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