aehas.blogg.se - Stellarium september 23 2017

29 The Milky Way now stands straight up from the south-southwest horizon after dark, like firelit smoke rising from some huge, ghostly campfire, if you're in the world's mid-northern latitudes. Upsilon 1, slightly fainter, is the farther one. They're orange giants unrelated to each other, 200 and 400 light-years away. The "one" on the left, fainter, is a naked-eye pair in a dark sky: Upsilon 1 and Upsilon 2 Cassiopeiae, 0.3° apart. It's a Sun-like star just 19 light-years away with an orange-dwarf companion, a lovely binary in a telescope. The brightest of these, on the right, is Eta Cassiopeiae, magnitude 3.4. Notice the dim naked-eye stars along that segment (not counting its two ends). Look along the second segment of the W counting down from the top. The right-hand side of the W, the brightest side, is tilted up.

The starry W of Cassiopeia stands high in the northeast after dark.

Look south-southeast, and there will be 1st-magnitude Fomalhaut about equally high too. There will be Jupiter at about the same height (depending on your latitude). When will this happen? That depends on both your latitude and longitude. Later in the evening, Arcturus and Capella shine at the same height in their respective compass directions. Capella, equally bright, is barely rising in the north-northeast (depending on your latitude the farther north you are the higher it will be.) They're both magnitude 0.

Arcturus shines in the west as twilight fades out.

The apparent sizes of the Moon, planets, and stars are exaggerated for clarity.) The Moon's position is exact for an observer near the middle of North America.

(The blue 10° scale is about the width of your fist at arm's length. The waxing Moon re-enters the evening sky this week, shining with Jupiter on October 3rd.