The Square of Pegasus is formed by three bright stars in Pegasus – Algenib, Scheat, and Markab – with Alpheratz in the neighbouring constellation Andromeda. It is easily recognizable for the Great Square of Pegasus, a conspicuous asterism that dominates the eastern sky in the early evening and makes its way across the sky during the night. The constellation Pegasus is also high above the horizon around 10 pm. Aljanah is an orange giant 72.7 light-years away, and Fawaris is a more luminous A-type subgiant 165 light-years away. Tonight’s sky as seen from mid-northern latitudes, image: StellariumĪljanah and Fawaris, the stars that mark the Swan’s wings, outline the beam of the Northern Cross with Sadr. It is an orange bright giant that forms a striking contrasting visual double star with its hot blue neighbour Albireo B. Albireo, the faintest of the five stars, marks the bottom of the Northern Cross. It is surrounded by a large diffuse nebula known as Sadr Region or the Gamma Cygni Nebula (IC 1318). Sadr, another supergiant, lies at the centre of the Cross. It is part of the brighter and larger Summer Triangle asterism, which it forms with the brighter Vega in the constellation Lyra and Altair in Aquila. The supergiant Deneb sits at the top of the Northern Cross and marks the celestial Swan’s tail. All five stars have evolved away from the main sequence and entered the final stages of their life cycles. The cross-shaped asterism is formed by the five brightest stars in the constellation Cygnus (the Swan). Northern hemisphereįrom locations in the mid-northern latitudes, the Northern Cross appears high overhead in the evening. The constellation maps below show the sky at around 10 pm in the mid-northern, equatorial, and mid-southern latitudes. The night sky tonight looks different depending on the location. These two bright, large asterisms dominate the evening sky.įor observers in the southern hemisphere, the zodiac constellations Sagittarius and Capricornus are high overhead in the evening, as are the Southern Birds: Phoenix, Grus, Tucana, and Pavo. For northern observers, autumn is the best time of the year to see the Northern Cross in Cygnus and the Square of Pegasus. The constellations in tonight’s sky host many familiar star patterns.
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