IC 10 is an irregular galaxy that is the closest known starburst galaxy and the only one in the Local Group of galaxies.Ĭassiopeia has been variously portrayed throughout her history as a constellation. A rich section of the Milky Way runs through Cassiopeia, containing a number of open clusters, young luminous galactic disc stars, and nebulae. Fourteen star systems have been found to have exoplanets, one of which-HR 8832-is thought to host seven planets. Cassiopeia A is a supernova remnant and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. In 1572, Tycho Brahe's supernova flared brightly in Cassiopeia. The semiregular variable PZ Cassiopeiae is one of the largest known stars.
The constellation hosts some of the most luminous stars known, including the yellow hypergiants Rho Cassiopeiae and V509 Cassiopeiae and white hypergiant 6 Cassiopeiae.
Even in low southern latitudes below 25ºS it can be seen low in the North.Īt magnitude 2.2, Alpha Cassiopeiae, or Schedar, is generally the brightest star in Cassiopeia, though is often shaded by Gamma Cassiopeiae, which has brightened to magnitude 1.6 on occasion. In northern locations above latitude 34ºN it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November. It is easily recognizable due to its distinctive 'W' shape, formed by five bright stars. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. Visible at latitudes between + 90° and −20°.īest visible at 21:00 (9 p.m.) during the month of November.Ĭassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty.
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