Rho Cassiopeiae is a semi-regular pulsating variable yellow-hued supergiant star, among the most luminous stars in the galaxy with a luminosity of approximately 500,000 solar luminosities. Epsilon Cassiopeiae is a blue-white hued star of magnitude 3.3, 442 light-years from Earth. There are several dimmer single stars in Cassiopeia. Ruchbah appears to have a blue-white hue and it is 99 light-years from Earth. It varies by 0.1 magnitudes around magnitude 2.7 its period is two years and one month. Delta Cassiopeiae, also known as "Ruchbah", is a Algol-type eclipsing variable star. Gamma Cassiopeiae has a minimum magnitude of 3.0 and a maximum magnitude of 1.6 it is currently approximately magnitude 2.2. This causes the star to be somewhat unstable and periodically eject rings of material. Gamma Cassiopeiae is a shell star, a type of variable star that has a very high rate of rotation. The two other notably bright stars in Cassiopeia are both variable stars. Caph, designated Beta Cassiopeiae, is a white-hued star of magnitude 2.3, 54 light-years from Earth. The secondary is widely separated from the primary and is of magnitude 8.9. The primary is an orange-hued giant of magnitude 2.2, 229 light-years from Earth. Alpha Cassiopeiae, traditionally called "Shedir", is a double star. The four brightest stars of Cassiopeia are all brighter than the third magnitude. In the Northern hemisphere Cassiopeia never sets below the horizon, as a result it is visible all year in the night sky.įrom January to March the constellation will first appear almost overhead around 6 pm, as the evening progresses it will head down towards the horizon in a north-westerly direction, by early morning Cassiopeia will be low on the horizon in a more northerly or north-easterly direction.įrom April to June Cassiopeia will be visible low on the horizon in a northerly or north-westerly direction at around 9 pm, moving eastwards it will stay quite low in the sky for several hours before beginning to rise higher around 2 am.įrom July to September the constellation will be visible from around 10 pm in a northerly or north-easterly position, as the night progresses it will end up almost directly overhead before day breaks.įrom October to December it will appear high in the sky in the north-east at around 6 pm, within a few hours the constellation will move overhead before dipping back down towards the horizon in a north-westerly direction.Notable features Stars File:Cassiopeiaurania.jpgĬassiopeia in her chair, as depicted in Urania's Mirror, a set of constellation cards published in London c.1825. This chart can also be applied to other areas of the Northern hemisphere such as Canada, the UK and Europe. The chart shows the position of Cassiopeia over most of the United States in mid-autumn at 10 pm. Cassiopeia is one of the ancient constellations catalogued by the Greco-Roman astronomer Ptolomy almost 2,000 years ago.The Pacman Nebula, named after its resemblance to the old video game character, also lies within the constellation.The supernova remnant "Cassiopeia A" lies within the boundaries of the constellation, supernova remnants are nebulas which form after the explosion of a large star.Schedar is the brightest star in the constellation, it is 40 times larger in diameter than the sun.If we were able to observe the sun from the nearest star system Alpha Centauri, it would appear in the constellation of Cassiopeia.The combination of its simple 'w' shape and the brightness of its stars makes Cassiopeia one of the most easily recognizable constellations in the night sky.The constellation is visible in some northerly regions of the Southern hemisphere in late spring.Cassiopeia is visible all year in the Northern hemisphere.Cassiopeia is one of the brightest and most recognizable constellations in the night sky.
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