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USPS Star Calendar for 28 July-3 August 21 July 2013

Posted by amedalen in August 2013, July 2013.
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28 Jul    High in the south at first light, the waning gibbous moon is between Alpheratz, 2½ fist-widths to the upper right, and magnitude 2.0 Mira, 2 fist-widths to the lower left in the constellation Cetus, the Sea Monster.

29 Jul    Rising around midnight, the last-quarter moon (1743 UT) is high in the southwest before dawn tomorrow.

30 Jul    Rising 1½ hours before the sun, magnitude 0.2 Mercury reaches its greatest elongation west of the sun and should be visible before the sky brightens. With your binoculars, try spotting magnitude 1.6 Mars 3 finger-widths above Mercury and magnitude –1.9 Jupiter 1½ finger-widths to Mars’ upper right.

31 Jul    High in the east before dawn, look for the Pleiades Cluster 3 finger-widths to the waning crescent moon’s upper left. The moon is about one-third illuminated.

1 Aug    Magnitude 1.1 Aldebaran is 1 finger-width to the moon’s lower right before dawn.

3 Aug    Over the next few days, the waning crescent moon passes by three planets in the pre-dawn sky. This morning look for magnitude –1.9 Jupiter, 3 finger-widths to the moon’s left or lower left, and magnitude 1.6 Mars, 3 finger-widths to Jupiter’s lower left. About 10 percent illuminated, the moon is at apogee, 63.63 Earth-radii (252,000 miles) away.

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