Tuesday 19 September 2017 - 08:03:53 Posted by  Bobby

 Mythology of Cassiopeia

 This attractive constellation represents the mythical Queen Cassiopeia. Her husband and daughter are represented by the adjacent constellations Cepheus and Andromeda. Cassiopeia was notoriously vain and is depicted sitting on a throne, fussing with her hair. Cassiopeia's brightest stars form a distinctive W-shape. Epsilon Cassiopeiae, at one end of the W, marks the queen's ankle while Beta, at the other end, lies in her shoulder.

 The Facts

  • Depiction: The Queen
  • Pronounced: kass-ee-oh-PEE-aah
  • Genitive: Cassiopeiae
  • Abbreviation: Cas
  • Highest in the Sky: October to December
  • Size Ranking: 25th
  • Coverage Area: 598 Sq. Degrees
  • Right Acension: 1 Hour
  • Declination: 60°
  • Visibility: 90°N to 21°S

 Notable Objects

  • M52: Open Cluster
  • NGC 281: Pac-Man Nebula
  • NGC 7789: Open cluster
  • NGC 457: ET Cluster
  • NGC 663: Open cluster
  • NGC 654: Open cluster
  • NGC 659: Open cluster

 Named Stars

  • Schedir, Alpha Cassiopeiae
  • Caph, Beta Cassiopeiae
  • Cih, Gamma Cassiopeiae
  • Ruchbah, Delta Cassiopeiae
  • Segin, Epsilon Cassiopeiae
  • Achird, Eta Cassiopeiae
  • Marfak, Theta Cassiopeiae
  • Marfak, Mu Cassiopeiae

 Best Viewed Objects/Stars

Gamma Cassiopeiae

 A variable star, currently about magnitude 2.2. Its rapid spin causes rings of gas to be thrown off its equator, changing its brightness temporarily.

Eta Cassiopeiae

 A double star. It consist of a yellow star of magnitude 3.5 and an orange companion of magnitude 7.5 that can be seen with a small telescope. The two stars lie 19 light-years away, forming a genuine binary pair with an orbital period of 480 years.

Rho Cassiopeiae

 A highly luminous yellow supergiant. As a result of pulsations in its size, it varies between about 4th and 6th magnitudes in a cycle that lasts just under a year.


 An open cluster. It is visible with binoculars, covering an area about one-third the apparent size of the full Moon, although a telescope is needed to show its individual stars. It lies 5,200 light-years away. A 5th magnitude star that appears to be a member of the cluster actually lies much closer to us.

NGC 457

 An elongated open cluster, about one-third the apparent size of the full Moon and visible through binoculars or a small telescope. The cluster's appearance has been compared to an owl, with its two brightest stars marking the owl's eyes. The brightest star is the 5th magnitude Phi Cassiopeiae, a luminous supergiant.


 Where to?

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