Constellation Guide
Constellations: A Guide to the Night Sky
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Constellations in the Sky Tonight
The constellations in tonight’s sky host many familiar star patterns. For northern observers, autumn is the best time of the year to see Cassiopeia’s W, the Segment of Perseus, and the Great Square of Pegasus. These three bright asterisms are high above the horizon in the…
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Pumpkin Nebula (Sh2-232): A Jack-o’-Lantern Carved by a Star
The Pumpkin Nebula (Sharpless 2-232) is a vast, diffuse emission nebula located in the northern constellation Auriga. In infrared light, the cloud of gas and dust looks like a hollowed-out Halloween pumpkin. It is also known as the Halloween Nebula, the Jack-o’-lantern Nebula,…
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NGC 7727: A Galaxy with Two Supermassive Black Holes
NGC 7727 is a peculiar spiral galaxy located 89 million light-years away in the constellation Aquarius. With an apparent magnitude of 11.5 and an apparent size of 3.48 by 2.95 arcminutes, it can be observed in medium-sized telescopes. It is included in the Herschel 400 catalogue…
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Great Square of Pegasus: Your Guide to the Autumn Sky
The Great Square of Pegasus is an asterism formed by four bright stars: Markab, Scheat and Algenib in the constellation Pegasus and Alpheratz in the neighbouring Andromeda. Together, the stars outline the main body of Pegasus, the mythical Winged Horse, appearing as a large,…
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Cosmic Caterpillar: A Protostar Racing Against Time
The Cosmic Caterpillar (IRAS 20324+4057) is a protostar surrounded by an interstellar cloud of gas and dust located approximately 4,600 light-years away in the constellation Cygnus (the Swan). The gaseous knot is about 1 light-year long and lies within the larger Cygnus OB2…
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Garden Sprinkler Nebula: Hen 3-1475 in Sagittarius
The Garden Sprinkler Nebula (Henize 3-1475, IRAS 17423-1755) is a protoplanetary nebula located approximately 18,900 light-years away in the constellation Sagittarius. It was produced by an evolved star near the end of its asymptotic giant branch (AGB) phase as it expelled…
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Altair (Alpha Aquilae): The Eagle’s Fast-Spinning Star
Altair (Alpha Aquilae) is the brightest star in the constellation Aquila (the Eagle) and one of our nearest visible neighbours, lying only 16.73 light-years away. Shining at magnitude 0.76, it is the 12th brightest star in the night sky. Altair is one of the fastest-spinning…
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Lightning Bolt: A Star Hop Through the Fainter Zodiac
The Lightning Bolt is a relatively bright asterism formed by the brightest stars in the constellations Pegasus, Aquarius, and Capricornus: Enif, Sadalsuud, Sadalmelik, and Deneb Algedi. The star pattern appears in the same region as the Water Jar and helps observers identify the…
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E Nebula (Barnard 142/143): The Milky Way’s Dark Letter
The E Nebula (or Barnard’s E Nebula) is a pair of prominent dark nebulae silhouetted against the Milky Way in the constellation Aquila. The two dark clouds of interstellar gas and dust appear in the region of the Eagle’s shoulder and cast a shadow on the Milky Way’s dense star…
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NGC 6905: The Blue Flash Nebula in Delphinus
The Blue Flash Nebula is a small but relatively bright planetary nebula located in the northern constellation Delphinus. It is listed as NGC 6905 in the New General Catalogue. With an apparent magnitude of 10.9 and an apparent size of 1.2 arcminutes, it can be spotted in a small…