RSGC1-F01 is a red supergiant star located approximately 22,000 light-years away in the constellation Scutum. With an estimated radius of 1,450 to 1,530 solar radii, it is one of the largest stars known. The supergiant is member of the massive young star cluster RSGC1. Discovered in 2006, the cluster and its members are invisible to the unaided eye and cannot be seen in optical telescopes.| Star Facts
Delta Scuti (δ Sct) is a yellow-white giant located 201 light years away in the constellation Scutum. The star serves as the prototype for a class of variable stars known as the Delta Scuti variables.| Star Facts
Edasich (ι Dra) is an orange giant star located approximately 101.2 light-years away in the constellation Draco. It hosts two orbiting exoplanets, Iota Draconis b (Hypatia) and Iota Draconis c.| Star Facts
The Little Dipper is an asterism formed by seven bright stars in the constellation Ursa Minor, the Little Bear. It has historically played an important role in navigation because it includes Polaris, the North Star.| www.constellation-guide.com
The Northern Cross is a prominent asterism formed by the brightest stars in the constellation Cygnus. It appears in a rich Milky Way field and outlines the body of the celestial Swan.| www.constellation-guide.com
The Cave Nebula (Sh2-155, Caldwell 9) is an emission nebula located approximately 2,400 light-years away in the northern constellation Cepheus. With an apparent magnitude of 7.7, it can be observed in medium telescopes.| www.constellation-guide.com
The largest stars in the known universe, listed here, are mostly cool red supergiants and hypergiants. Their radii are notoriously difficult to measure for several reasons.| Star Facts
Draco is one of the largest northern constellations. It represents the dragon Ladon in Greek mythology. The constellation is home to the Cat's Eye Nebula (NGC 6543), the Spindle Galaxy (M102), and the Tadpole Galaxy (Arp 188).| www.constellation-guide.com
Cygnus, the Swan, is one of the largest northern constellations. Recognizable for the Northern Cross, it is home to the bright supergiant Deneb, the North America Nebula (NGC 7000) and the Gamma Cygni Nebula (IC 1318).| www.constellation-guide.com
The Blinking Planetary Nebula (NGC 6826, Caldwell 15) is a planetary nebula located approximately 2,000 light-years away in the northern constellation Cygnus. It appears in the region of the Swan's wing.| www.constellation-guide.com
Cassiopeia is a prominent constellation in the northern sky. Recognizable for its W shape, the constellation is home to the Heart Nebula, the Soul Nebula, the Pacman Nebula, and the open clusters Messier 52 and Messier 103.| www.constellation-guide.com
Leo is one of the largest constellations in the northern sky. It is home to Regulus, one of the brightest stars in the sky, the nearby red dwarf Wolf 359, and the Leo Triplet of galaxies.| www.constellation-guide.com
The Ghost Head Nebula (NGC 2080) is an emission nebula located 160,000 light-years away in the Large Magellanic Cloud in the constellation Dorado. The star-forming region appears near the larger Tarantula Nebula (30 Doradus).| www.constellation-guide.com
Gamma Cassiopeiae (γ Cas) is a spectroscopic binary star located at a distance of 550 light years from Earth in the constellation Cassiopeia. It is the central star of Cassiopeia's W.| Star Facts
Messier 52 (M52, NGC 7654) is a bright open cluster located in the constellation Cassiopeia. With an apparent magnitude of 6.9, it can be seen in binoculars and small telescopes. The cluster lies 4,600 light years away.| Messier Objects
The W-shaped asterism formed by the five brightest stars of Cassiopeia is one of the most familiar features of the northern night sky. It is used to find the Heart and Soul Nebulae, the Double Cluster, the open clusters M52 and M103, and many other deep sky objects.| www.constellation-guide.com
Andromeda is a large constellation in the northern sky. Associated with the mythical princess Andromeda, the constellation is home to the Andromeda Galaxy (M31), the Blue Snowball Nebula, and the NGC 68 Group of galaxies.| www.constellation-guide.com
Polaris (α UMi), the North Star, is a yellow supergiant located 446 light-years away in the constellation Ursa Minor. The star is part of the Little Dipp| Star Facts
Zeta Ophiuchi (ζ Oph) is a hot blue star located 366 light-years away in the constellation Ophiuchus. It is the closest O-type to Earth. Shining at magnitude 2.57, it is the third brightest star in Ophiuchus.| Star Facts
Alderamin, Alpha Cephei (α Cep), is a white main sequence star located at a distance of 49.05 light years from Earth in the constellation Cepheus.| Star Facts
Mira, Omicron Ceti (ο Cet), is a red giant star located at a distance of 300 ly from Earth in the constellation Cetus. It is a pulsating variable star and a prototype for its own class, known as the Mira variables.| Star Facts