Andromeda Constellation Facts
The object to the right of the constellation is the Andromeda galaxy.
- Andromeda is visible in both the Northern and Southern hemispheres.
- In the Northern hemisphere Andromeda can be seen from August to February.
- In the Southern hemisphere the constellation can be viewed from October to December.
- The Andromeda galaxy, which lies within the constellation, is the furthest object that can be seen with the naked eye, it is 2.5 million light years from Earth.
- The Andromeda galaxy is orbited by several smaller galaxies, some of which are visible through a telescope or binoculars.
- Alpheratz is the brightest star in the constellation and also forms part of the Square of Pegasus asterism.
- Andromeda is part of the Perseus group of constellations which also includes Cassiopeia and Pegasus.
- The Andromedids meteor shower which occurs every November is named after Andromeda as it appears to emanate from the constellation.
- Andromeda is one of the original constellations listed by the Greco-Roman scientist Ptolemy almost 2,000 years ago.
Princess Andromeda hurtling across the night sky in a rather unflattering pose.
Main Stars and Objects in the Andromeda Constellation
The number next to each star is its apparent magnitude, its brightness from our point of view on Earth, the lower the number the brighter the star in the night sky.
Also know as Gamma Andromedae, Almach is actually a triple star system around 350 light years from Earth, the primary star is an orange giant around 80 times larger than our sun. Mirach
Also known as Beta Andromedae, Mirach is a red giant around 200 light years from Earth, it has a mass around 4 times greater than our sun and is 100 times larger in size, Mirach is occasionally the brightest star in the constellation but as its brightness is variable it isn't officially considered the brightest star. Alpheratz
Also known as Alpha Andromedae, Alpheratz is actually a binary system consisting of two stars orbiting each other, the primary component is a blue star with a radius 3 times greater than our sun with surface temperatures more than twice as hot. Alpheratz is officially the brightest star in Andromeda, it is also considered as part of Pegasus as it connects both constellations. M31
The most interesting object in the constellation is undoubtedly M31, otherwise known as the Andromeda Galaxy. Even though this galaxy is 2.5 million light years from Earth it is brighter than many stars in the night sky and is easily visible to the naked eye. The Andromeda galaxy is larger in size to our own Milky Way galaxy but may be less massive.
Finding Andromeda - Northern Hemisphere
Finding Andromeda - Southern Hemisphere