Universe Guide

Cassiopeia, Queen of Ethiopia Constellation

Cassiopeia Constellation Star Map

Cassiopeia (Pronounciation:Cas-see-o-pee-ah, Abbrev:Cas, Latin:Cassiopeiae) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Cassiopeia takes up 598.407 sq. degrees of the night sky which equates to 1.45% of the night sky. Cassiopeia is the 25th largest in terms of size in the night sky.

The constellation name means Queen of Ethiopia . The constellation is one of the original constellations that was devised by the Ancient Greco-Egyptian astronomer Ptolemy who lived between 90 A.D. and 168 A.D.

There are 5 stars that make up the main constellation. The hipparcos satellite scanned and detailed 2324 stars. There are 93 stars that can be seen with the naked eye in the constellation on a very clear night sky.

Cassiopeia is not a member of the Zodiac group of twelve constellations that appear when the Sun sets. Cassiopeia is a northern hemispheric constellation which means it can't be seen easily or at all from the southern hemisphere.

There are 20 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. There is a dedicated page for exoplanets in Cassiopeia. The current largest star so far identified in the constellation of Cassiopeia is PZ Cassiopeiae.

There are 2 deep space objects that were identified by Charles Messier in this constellation. There are 1 non-Messier deep space objects that are covered on this site and the list is below.

The image at the top right of this page was generated using Night Vision, a free to use and download application by Brian Simspon.

Distance to Cassiopeia

You can't just go to one location and arrive at the constellation because the constellation is made up of stars at different locations and different distances. The nearest main star in the constellation is at a distance of 54.74 light years and the furthest main star is a distance of 549.10 light years. The average distance to the main stars is 268.66 light years.

Cassiopeia Star Facts

The caveat of these stars are that they are catalogued on this site. If you know of a star that is nearer or further then do let me know in the comments and I'll add it to the site. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status.

Achird, Cassiopeia's Nearest Star

The nearest star to Earth is Achird which is roughly about 19.42 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 7924 which is about 54.83 Light Years.

HIP 12972, Cassiopeia's Furthest Star

The furthest star that is located in the constellation is HIP 12972 and it is 326163.3 light years away from the Sun. The furthest figure is derived from either the 1997 or 2007 Hipparcos star catalogue parallax figure and it has been known to produce distances that are wrong.

Schedar, Brightest Star in Cassiopeia

The brightest star in Cassiopeia is Schedar and is located about 46.61 light years from the Sun. The star has a apparent magnitude of 2.24 but an absolute magnitude of -1.98 when the star is viewed from a distance of 10 Parsecs or 32.6 Light Years. The star is recognised as being the brightest in the constellation as it has the Bayer status of Alpha.

52 Cassiopeiae, Cassiopeia's Dimmest Visible Star

The dimmest star that can be seen in Cassiopeia with the naked eye is 52 Cassiopeiae. The dim star has an apparent magnitude of 6. The dimmest star that a person is able to see with their naked eye is 6.0 magnitude based on the table in the reference. Ref: University of Michigan.

AR Cassiopeiae

AR Cassiopeiae is a large multiple star system, whilst most multiple star systems are binaries such as Sirius also known as Alpha Canis Majoris, AR Cassiopeiae has seven stars in the system. There is only one other star that has that many stars and that is Jabbah in the constellation of Scorpius.

PZ Cassiopeiae

PZ Cassiopeiae is one of the largest stars so far discovered. If it was at the centre of our solar system, we would be inside the star. It is over 1,200 times the size of our Sun but it is not the largest. The largest star accolade goes to UY Scuti at over 1,800 times the radius.

V762 Cassiopeiae

V762 Cassiopeiae is the furthest star you can see with the naked eye. To see V762 Cassiopeiae you will need to be a very clear sky as it is on the borders of what is visible with the naked eye, apparent magnitude 6.5.

How to Find and View Cassiopeia in the Night Sky

Northern Hemisphere

Cassiopeia is one of four constellations that can be seen all the year round in the Northern Hemisphere. There is no best or worst time for it. The only thing that could affect your viewing is light and exactly where you are in the Northern Hemisphere.

Southern Hemisphere

If you are as far down south as Sydney, you will not be able to see the constellation. If you go further north, say in Darwin, you will just be able to see the constellation in the northerly direction. The constellation can be seen at about nine o'clock by looking north.

Cassiopeia Mythology

Cassiopeia was the queen of Philistia, now assumed to be latter day Ethiopia. Cassiopeia was married to King Cepheus, also a constellation. Cassiopeia was known to be very vain. When her daughter Andromeda was of a mature age, she was tied to a large rock to be sacrificed. Help would come from Perseus who would kill Cetus using the severed head of Medusa, the half-woman / half-serpent with snakes for hair and who could turn anyone to stone by looking at them. The Legend is told in Clash of the Titans film and in the 2010 remake.

Cassiopeia was name of a character in the original Battlestar Galactica series. Cassiopeia was a socialite character who became the love interest of the original Starbuck. In the second half of the series, her character was fleshed out a bit more and she became a medical technician.

The Sun's constellation

The Sun is not in a constellation but if we were on the planet orbiting Proxima Centauri then our Sun would be in Cassiopeia. Our Sun would be located to the south west of Segin, also known as Epsilon Cassiopeiae.

Meteor Showers Radiating from Cassiopeia

There are 17 Meteor Showers that occur during the year within this constellation based on information gathered from Adam Mickiewicz University (Poland). The list below are major ones and which I have a date period for.

NameActivityPeak ActivityClosest Star
Beta Cassiopeids3 Jul- 19 Aug29-JulCaph

List of Main Stars in Cassiopeia

The following list contains the stars that make up the constellation. For a larger list of stars in the entire constellation area, please visit the For a list of named stars, that is stars that don't start HD or HIP, please visit Cassiopeia Star List page.

NameBayerDistance (Lt.Yr.)Right AscensionDeclinationSpectral TypeColour
SchedarAlpha Cassiopeiae228.2500h 40m 30.39+56d 32` 14.7K0II-IIIvarOrange
CaphBeta Cassiopeiae54.7400h 09m 10.09+59d 09` 00.8F2III-IVYellow/White
CihGamma Cassiopeiae549.1000h 56m 42.50+60d 43` 00.3B0IV:evarBlue/White
RuchbahDelta Cassiopeiae99.4101h 25m 48.60+60d 14` 07.5A5Vv SBWhite
SeginEpsilon Cassiopeiae411.8201h 54m 23.68+63d 40` 12.5B2pvarBlue/White

Cassiopeia Facts

Is a Zodiac Sign No
Brightest StarSchedar
Area598.407 sq. deg.
Percentage of Night Sky1.45%
Size Position25th
Hemisphere Northern
Site Exoplanet Count20
Meteor Shower Count17
Nearest StarAchird
Nearest Star with Exoplanet(s)HD 7924
Largest StarPZ Cassiopeiae
Brightest StarSchedar
Dimmest Star52 Cassiopeiae
Furthest StarHIP 12972
Bright Star Count93
Hipparcos Star Count2324
Main Star Count5
Messier Deep Space Object Count2
Bordering / Neighbouring / Surrounding ConstellationsCepheus

*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.

List of Deep Space Objects (Galaxies, Nebulas, Supernovas, etc) in Cassiopeia

NameTypeDistanceDeclinationRight Ascension
Bubble NebulaEmission Nebula7,100 - 11,000+61 12 0623 20 48m 3
Heart NebulaEmission Nebula7,50061:26:3602h 33h 22
Messier 103 (NGC581)Open Star Cluster10000+60:4201h 33m 2
Messier 52 (NGC7654)Open Star Cluster5000+61:3523h 42m 2
NGC 1027Open Star Cluster3,100 +61:38:0002h 42h 43
NGC 147Galaxy in a Group of Galaxies+48 30 31.4600 33 12m 120
NGC 7789Open Star Cluster7,60056:42:3023h 57h 24
Owl ClusterOpen Star Cluster7,92258:17:271h 19h 32
Pacman NebulaStar-Forming Nebula9,000 56:37:26.3300 52 41m 74
SN 1181Supernova Remnant+64 49 4202 05 37m 0
SN 1572Supernova Remnant+64 08 2700 25 21m 5
SN 1572ASupernova Remnant+64 08 2700 25 21m 5
Soul NebulaEmission Nebula7,500 60:24:362h 55h 24

Comments and Questions

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