The Constellation Andromeda

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

Andromeda is a large northern constellation, visible in the months around September.

It is home to one of the best-known of all deep-sky objects, the Andromeda Galaxy, M31, which is the nearest comparably-sized galaxy to our own Milky Way. Around M31 can be seen a number of smaller companion galaxies, including M32 and M110.

Lying not far from the plane of the northern Milky Way, Andromeda is also home to numberous open clusters.

Andromeda's brightest star, Alpheratz forms one corner of the Square of Pegasus, and was once shared between the two constellations with the designations α–And and δ–Peg. Today it is assigned exclusively to Andromeda, and the designation δ–Peg is defunct.

In Greek mythology, Andromeda was the daughter of King Cepheus and Queen Cassiopeia. She was chained to a rock as a sacrifice, after the god Poseidon had sent a sea monster – sometimes associated with the constellation Cetus – in retribution for Cassiopeia's boastfulness.

She was rescued by Perseus, whom she married.

Date First Appeared
Sky Area
1.8% of the sky
722.3 square degrees
Messier Objects
Andromeda contains the following Messier objects: M31, M32, M110.
Caldwell Objects
Andromeda contains the following Caldwell objects: C22, C23, C28.
The following constellations neighbor Andromeda: Cassiopeia, Lacerta, Pegasus, Perseus, Pisces, Triangulum.
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Brightest Objects in Andromeda

Stars Open Clusters Globular Clusters Galaxies
Stars Open Clusters Globular Clusters Galaxies
Alpheratz (mag 2.1) NGC 7686 (mag 5.6) Messier 31 (mag 3.5)
Mirach (mag 2.1) NGC 752 (mag 5.7) Messier 110 (mag 8.0)
Almach (mag 2.2) NGC 956 (mag 9.0) Messier 32 (mag 8.2)
δ-And (mag 3.3) IC 24 NGC 891 (mag 10.0)
51-And (mag 3.6) NGC 272 NGC 404 (mag 10.1)
O-And (mag 3.6) NGC 7640 (mag 10.9)
λ-And (mag 3.9) IC 239 (mag 11.2)
μ-And (mag 3.9) NGC 80 (mag 12.1)
ζ-And (mag 4.1) NGC 214 (mag 12.2)
Titawin (mag 4.1) NGC 679 (mag 12.4)
κ-And (mag 4.1) NGC 753 (mag 12.4)
ι-And (mag 4.3) NGC 160 (mag 12.4)
φ-And (mag 4.3) NGC 83 (mag 12.6)
π-And (mag 4.3) NGC 551 (mag 13.0)
ε-And (mag 4.4) NGC 828 (mag 13.0)
η-And (mag 4.4) NGC 573 (mag 13.0)
σ-And (mag 4.5) NGC 687 (mag 13.0)
ν-And (mag 4.5) NGC 393 (mag 13.0)
7-And (mag 4.5) NGC 108 (mag 13.0)
θ-And (mag 4.6) NGC 528 (mag 13.0)
3-And (mag 4.6) NGC 536 (mag 13.0)
65-And (mag 4.7) NGC 812 (mag 13.0)
58-And (mag 4.8) NGC 834 (mag 13.0)
ω-And (mag 4.8) NGC 846 (mag 13.0)
8-And (mag 4.8) NGC 68 (mag 13.0)




Color scheme