The Sky This Week: April 16 – 17
Saturday, April 16
Mars pokes above the eastern horizon just after 11 p.m. local daylight time this week and remains prominent until morning twilight is well underway. The Red Planet’s eastward motion relative to the background stars of southern Ophiuchus comes to a halt today; it then starts moving westward at the start of its so-called retrograde loop. This is a sure sign that Mars is approaching peak visibility, which it will reach at opposition in late May. Our neighboring world currently shines at magnitude–1.0, trailing only the Moon, Jupiter, and Sirius. When viewed through a telescope, Mars appears 14″ across and should display a prominent north polar cap as well as subtle dark markings.
Sunday, April 17
The waxing gibbous Moon’s motion through the night sky carries it near Jupiter tonight. The night sky’s two brightest objects appear only 2° apart, or about four times the Moon’s diameter.
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