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6 Cassiopeiae, HD223385, HIP117447, HR9018

6 Cassiopeiae is a blue pulsating supergiant star that can be located in the constellation of Cassiopeia. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

6 Cassiopeiae's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR9018. HIP117447 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD223385.

6 Cassiopeiae has alternative name(s) :- , V566 Cas.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 6 Cassiopeiae with it shortened to 6 Cas.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+61 2533.

More details on star alternative names can be found at Star Names .

Location of 6 Cassiopeiae

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For 6 Cassiopeiae, the location is 23h 48m 50.17 and +62° 12` 52.3 .

Proper Motion of 6 Cassiopeiae

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -1.57 ± 0.28 miliarcseconds/year towards the north and -3.57 ± 0.37 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -42.30000 km/s with an error of about 0.60 km/s .

Physical Properties (Colour, Temperature) of 6 Cassiopeiae

6 Cassiopeiae has a spectral type of A3Ia comp. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.67 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,716 Kelvin.

6 Cassiopeiae Radius has been calculated as being 389.76 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 271,195,525.21.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 147.50. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.46 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

6 Cassiopeiae Apparent and Absolute Magnitudes

6 Cassiopeiae has an apparent magnitude of 5.43 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -8.06 If you used the 2007 Parallax value, you would get an absolute magnitude of -5.95. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to 6 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.20 which gave the calculated distance to 6 Cassiopeiae as 16308.17 light years away from Earth or 5000 parsecs. It would take a spaceship travelling at the speed of light, 16308.17 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 0.53 which put 6 Cassiopeiae at a distance of 6154.03 light years or 1886.79 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Variable Type of 6 Cassiopeiae

The star is a pulsating Alpha Cygnus variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. 6 Cassiopeiae brightness ranges from a magnitude of 5.640 to a magnitude of 5.550 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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6 Cassiopeiae Facts

Visual Facts


Primary / Proper / Traditional Name6 Cassiopeiae
Alternative NamesHD 223385, HIP 117447, HR 9018, 6 Cas, BD+61 2533, V566 Cas
Spectral TypeA3Ia comp
Multiple Star SystemYes
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationCassiopeia
Absolute Magnitude-8.06 / -5.95
Visual / Apparent Magnitude5.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)23h 48m 50.17
Declination (Dec.)+62° 12` 52.3
Galactic Latitude0.22 degrees
Galactic Longitude115.71 degrees
1997 Distance from Earth0.20 Parallax (milliarcseconds)
 16308.17 Light Years
 5000 Parsecs
2007 Distance from Earth0.53 Parallax (milliarcseconds)
 6154.03 Light Years
 1886.79 Parsecs
Proper Motion Dec.-1.57 ± 0.28 milliarcseconds/year
Proper Motion RA.-3.57 ± 0.37 milliarcseconds/year
B-V Index0.67
Radial Velocity-42.30 ± 0.60 km/s
Iron Abundance0.46 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeAlpha Cygnus
Mean Variability Period in Days0.077
Variable Magnitude Range (Brighter - Dimmer)5.550 - 5.640

Estimated Facts


Calculated Effective Temperature5,716 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
223385+61 2533.0A5.700000.0000011.00000A2White
B8.200001854
C10.700001912
D1924

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