The Constellation Cassiopeia

by Dominic Ford
Cassiopeia Cassiopeia
The constellation Cassiopeia. Roll mouse over to see labels.
Source: Stellarium.

Cassiopeia is one of the most recognisable of the constellations, a distinctive 'W' shape in the far northern sky. It is highest in the sky at midnight in the months around September.

The plane of the Milky Way runs through the middle of the 'W' asterism, making it a particularly rich area of the sky to view through binoculars. It contains more than twenty open clusters exceeding tenth magnitude, and a similar number of fifth magnitude stars.

In classical mythology, Cassiopeia was queen of Ethiopia, wife of Cepheus and mother of Andromeda.

Date First Appeared
Ancient
Sky Area
1.5% of the sky
598.4 square degrees
Messier Objects
Cassiopeia contains the following Messier objects: M52, M103.
Caldwell Objects
Cassiopeia contains the following Caldwell objects: C8, C10, C11, C13, C17, C18.
Neighbors
The following constellations neighbor Cassiopeia: Andromeda, Camelopardalis, Cepheus, Lacerta, Perseus.
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Brightest Objects in Cassiopeia

Stars Open Clusters Globular Clusters Galaxies
Stars Open Clusters Globular Clusters Galaxies
γ-Cas (mag 2.2) IC 1590 (mag 0.0) NGC 185 (mag 9.2)
Schedar (mag 2.2) NGC 7438 (mag 0.0) NGC 147 (mag 9.5)
Caph (mag 2.3) NGC 110 (mag 0.0) IC 10 (mag 9.5)
Ruchbah (mag 2.7) NGC 657 (mag 0.0) NGC 278 (mag 10.9)
ε-Cas (mag 3.4) NGC 136 (mag 0.0) NGC 1343 (mag 12.3)
η-Cas (mag 3.5) NGC 743 (mag 0.0)
ζ-Cas (mag 3.7) NGC 433 (mag 0.0)
50-Cas (mag 4.0) IC 1824 (mag 0.0)
κ-Cas (mag 4.2) NGC 366 (mag 0.0)
θ-Cas (mag 4.3) NGC 457 (mag 6.4)
O-Cas (mag 4.5) IC 1848 (mag 6.5)
ρ-Cas (mag 4.5) IC 1805 (mag 6.5)
ι-Cas (mag 4.6) NGC 129 (mag 6.5)
υ²-Cas (mag 4.6) NGC 654 (mag 6.5)
A-Cas (mag 4.6) NGC 1027 (mag 6.7)
χ-Cas (mag 4.7) NGC 7789 (mag 6.7)
ψ-Cas (mag 4.7) Messier 52 (mag 6.9)
λ-Cas (mag 4.7) NGC 225 (mag 7.0)
ξ-Cas (mag 4.8) NGC 663 (mag 7.1)
HD 5015 (mag 4.8) Messier 103 (mag 7.4)
υ¹-Cas (mag 4.8) NGC 659 (mag 7.9)
HD 19275 (mag 4.8) NGC 637 (mag 8.2)
1-Cas (mag 4.8) NGC 7790 (mag 8.5)
τ-Cas (mag 4.9) NGC 436 (mag 8.8)
AR Cas (mag 4.9) NGC 189 (mag 8.8)

Ashburn

Latitude:
Longitude:
Timezone:

39.04°N
77.49°W
EDT

Color scheme