Haut
Bas

Sky at the glance

The essential guide to astronomy
  1. Jupiter and Saturn rise in twilight this week. Mars is a fire-beacon high in the southeast by the beginning of dawn. Venus, low as dawn begins to brighten, passes just 1° from Aldebaran on Saturday and Sunday mornings July 11th and 12th.

    The post This Week's Sky at a Glance, July 10 – 18 appeared first on Sky & Telescope.

  2. This is the time of year when the two brightest stars of summer, Arcturus and Vega, are equally high overhead at dusk. Arcturus is toward the southwest, Vega is toward the east.

    Arcturus and Vega are 37 and 25 light-years away, respectively. They represent the two commonest types of naked-eye stars: a yellow-orange K giant and a white A main-sequence star. They're 150 and 50 times brighter than the Sun, respectively — which, combined with their nearness, is why they dominate the high evening sky.

    The post This Week's Sky at a Glance, July 3 – 11 appeared first on Sky & Telescope.

  3. Every morning now, Venus is getting a little higher and easier to spot in the east-northeast as dawn brightens

    The post This Week's Sky at a Glance, June 26 – July 4 appeared first on Sky & Telescope.

  4. Leo the Lion is mostly a constellation of late winter and spring. But he's not gone yet. As twilight ends look due west, somewhat low, for Regulus, his brightest and now lowest star: the forefoot of the Lion stick figure.

    The Sickle of Leo extends upper right from Regulus. The rest of the Lion's constellation figure extends for almost three fists to the upper left, to his tail star Denebola, the highest. He'll soon be treading away into the sunset.

    The post This Week's Sky at a Glance, June 19 – 27 appeared first on Sky & Telescope.

  5. As we count down the days to official summer (the solstice is June 20th), the big Summer Triangle shines high and proud in the east after dark. Its top star is bright Vega. Deneb is the brightest star to Vega's lower left. Look for Altair farther to Vega's lower right.

    The post This Week's Sky at a Glance, June 12 – 20 appeared first on Sky & Telescope.