Sky This Week for July 29 to July 31, 2016
This week is all about the planets, the Moon, and the Delta Aquarid meteor shower.
By Richard Talcott
Friday, July 29
The Southern Delta Aquarid meteor shower isn’t the only event you’ll want to keep an eye on this morning. As the waning crescent Moon marches eastward relative to the background stars of Taurus, it passes directly in front of the Bull’s luminary. Our satellite occults 1st-magnitude Aldebaran for observers south of a line that runs from southern New Mexico to northern Maine. While viewers north of this line will see the Moon and star just miss each other, those along the line will witness the star skimming Luna’s northern limb. Be sure to set up ahead of time, center the star in your telescope’s field of view, and watch the magnificent show.
Uranus’ eastward motion against the background stars comes to a halt at 10 p.m. EDT. This so-called stationary point marks the beginning of the best period to observe the outer planet. Uranus rises before midnight local daylight time and appears more than halfway to the zenith in the southeastern sky as morning twilight commences. The magnitude 5.8 planet lies in Pisces, 2.7° due north of magnitude 4.8 Mu (m) Piscium. A telescope reveals Uranus’ blue-green disk, which spans 3.6″.
Saturday, July 30
Although Saturn reached its peak nearly two months ago, it remains a lovely sight. You can find the planet nearly due south around 9 p.m. local daylight time. Saturn shines at magnitude 0.3 and appears far brighter than any of the surrounding stars of southwestern Ophiuchus. When viewed through a telescope, the planet measures 18″ across while its dramatic ring system spans 40″ and tilts 26° to our line of sight.
Sunday, July 31
The two inner planets lurk low in the western sky shortly after sunset all week. Your best chance to spot them comes when they lie highest in the twilight this evening. If you scan the western horizon through binoculars 30 minutes after sunset, you should pick up Venus standing just 3° high. It shows up only because in shines so brightly, at magnitude –3.9. Mercury appears 6° above the horizon but will be harder to see because it glows more dimly at magnitude –0.2. And if you have a haze-free sky, you might spot the 1st-magitude star Regulus between the two planets.
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