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Abbreviation:  Cas
English Name:  The Cassiopeia Queen
Genitive: Schedar, sometimes spelt Shedar or Shedir.
  Northern Hemisphere
Location: Between the constellations of Andromeda and Cephus.
Visible between latitudes:  
+90 and -20 degrees
Best season: Autumn
Seen in three season:
 Summer, Autumn and Winter
Best seen in:
Seen between: Circumpolar (This constellation of Camelopardalis stays in the Sky all the year.)
Right Ascension (RA):  01 hour
Declination (DEC): +60 degrees
Area (square degrees):  598 (25th)

Cassiopeia (The Cassiopeia Queen)

  • The five leading stars make up a W-shape or M-shape pattern, on the opposite the Big Dipper (Ursa Major).
  • Easy to recognisable due to it helping by the `W` shape, formed by five bright stars.
  • Cassiopeia contains several Open Clusters resolvable in binoculars.

Messier Objects

  • M52 – Open Cluster, visible with binoculars – covering an area about one-third the size of Full Moon, although a telescope is needed to see some individual stars.
  • M103 – There are about 40 member stars within M103; two of which have magnitude +10.5, and magnitude +10.8 red giant, which is the brightest within the cluster.

Features of interest

  • NGC 457 – Open Cluster; appearance has been compared to an owl’s eyes pattern, with two brightest stars marking the owl’s eyes.
  • NGC 663 – also Known as Caldwell 10 (C10) is young Open Cluster of about 400 stars.
  • Two galaxies are in Cassiopeia by Andromeda to the south; NGC 147; also known as Caldwell 17 (C17), and NGC 185; also known as Caldwell 18 (C18).

Names Stars

  • Schedar (Alpha Cas) (sometimes spelt Shedar or Shedir)
  • Caph (Beta Cas)
  • Ruchbah (Delta Cas)
  • Segin (Epsilon Cas)
  • Achird (Eta Cas)
  • Marfak (Theta Cas)
  • Marfak (Mu Cas)


  • Photo of the constellation – Cassiopeia, as it appears to the naked-eye. (Lines have been added for clarity.)
  • Sky Chart  –  Cassiopeia
  • List of stars in Cassiopeia.


Back to The 88 Constellations Lists  page.

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