Sky This Week for June 23 to June 26, 2016
This week, it’s all about Saturn … but if you look close, you might spy an asteroid.
Thursday, June 23
• Mars remains near its peak all this week. The Red Planet reached opposition and best visibility a month ago but, like Saturn, has not declined much. Mars appears almost due south and at its highest as twilight fades to darkness. The world shines at magnitude –1.5 against the much fainter background stars of Libra. When viewed through a telescope, Mars’ orange-red disk spans 17″. Look for subtle dark markings along with a whitish north polar cap.
Friday, June 24
• Brilliant Jupiter appears high in the west as darkness falls and remains on display until midnight local daylight time. The giant planet shines at magnitude –1.9 against the backdrop of southern Leo the Lion. Jupiter appears equally dazzling through a telescope, which reveals a wealth of atmospheric features on a disk that spans 35″.
Saturday, June 25
• Look high in the northwest after darkness falls this month, and you’ll be greeted by the familiar sight of the Big Dipper. The Dipper is the most conspicuous asterism — a recognizable pattern of stars that doesn’t form a complete constellation shape — in the entire sky. It forms the body and tail of Ursa Major the Great Bear. Use the Pointers, the two stars at the end of the Dipper’s bowl, to find Polaris, which lies due north for everyone north of the equator. Polaris marks the end of the Little Dipper’s handle. On June evenings, the relatively faint stars of this dipper arc directly above Polaris.
Sunday, June 26
• If ever there was a good time to track down Pluto, this is the night. The distant world passes just 2.7′ due south of the 3rd-magnitude star Pi (p) Sagittarii in northeastern Sagittarius, making the task of finding the dwarf planet much easier than usual. Pluto glows dimly at magnitude 14.1, however, so you’ll need an 8-inch or larger telescope to spot it visually.
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