The Keystone is an asterism formed by four relatively bright stars in the constellation Hercules: Pi, Eta, Zeta and Epsilon Herculis. The trapezoid-shaped pattern makes it easy for observers to identify the constellation and to find several well-known deep sky objects. On a clear night, the Keystone can be seen between the bright Vega, the brightest star in Lyra, and the stars of Corona Borealis, the Northern Crown. The asterism represents Hercules’ torso.
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The Great Square of Pegasus is an asterism formed by three bright stars in Pegasus constellation – Markab, Scheat and Algenib – and Alpheratz in the neighbouring constellation Andromeda. For northern observers, the asterism is particularly prominent in the summer months, when it can be seen high overhead in the evening.
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Here are some of the highlights of the June sky:
- 9:30 PM – southern sky – Mars and Saturn rise over the horizon
- 9:30 PM western sky – Jupiter appears above the horizon, sinks lower toward the end of the month
- 5 AM eastern sky – Venus appearing above the horizon before sunrise; on June 24, it rises together with the crescent Moon just before dawn
- 10 PM southern sky – Boötes, the Herdsman, recognizable for its familiar kite shape, with Arcturus, the fourth brightest star in the sky, and the binary star Izar, Epsilon Boötis
- 10 PM – southeastern sky – Corona Borealis, the Northern Crown, visible to the left of Boötes constellation
- 10 PM eastern sky – Hercules constellation high in the sky, with the prominent Keystone asterism, the Hercules Cluster (Messier 13), and another globular cluster, Messier 92
- 10 PM northeastern sky – Draco constellation with the double star Nu Draconis
HubbleSite.org has released a video with the June night sky highlights: the evening and morning planets, summer constellations, star clusters, brightest stars and a partial solar eclipse on June 1. Watch the clip below.
EVENING & MORNING PLANETS
- Saturn – southwestern sky – 10 pm
- Jupiter – eastern sky – 5 am
Read More »The Night Sky in June