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W Persei, HD237008, HIP13262

W Persei is a red pulsating supergiant star that can be located in the constellation of Perseus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

W Persei's Alternative Names

HIP13262 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD237008.

W Persei has alternative name(s) :- , W Per.

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+56 724.

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

Location of W Persei

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 W Persei, the location is 02h 50m 37.89 and +56° 59` 00.3 .

Proper Motion of W Persei

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 -3.32 ± 0.93 miliarcseconds/year towards the north and -0.48 ± 1.38 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 -39.00000 km/s with an error of about 10.90 km/s .

Physical Properties (Colour, Temperature) of W Persei

W Persei has a spectral type of M3Iab. This means the star is a red supergiant star. The star has a B-V Colour Index of 2.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 18 Kelvin.

W Persei Apparent and Absolute Magnitudes

W Persei has an apparent magnitude of 8.91 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.37. 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 W Persei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.44 which gave the calculated distance to W Persei as -1336.74 light years away from Earth or -409.84 parsecs. It would take a spaceship travelling at the speed of light, -1336.74 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 0.35 which put W Persei at a distance of 9318.95 light years or 2857.14 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 W Persei

The star is a pulsating Semiregular late- (M, C, S or Me, Ce, Se) supergiants (Mu Cep) 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. W Persei brightness ranges from a magnitude of 9.875 to a magnitude of 8.401 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 545.0 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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W Persei Facts

Visual Facts


Primary / Proper / Traditional NameW Persei
Alternative NamesHD 237008, HIP 13262, BD+56 724, W Per
Spectral TypeM3Iab
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour red
GalaxyMilky Way
ConstellationPerseus
Visual / Apparent Magnitude8.91
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 50m 37.89
Declination (Dec.)+56° 59` 00.3
Galactic Latitude-2.20 degrees
Galactic Longitude138.65 degrees
1997 Distance from Earth-2.44 Parallax (milliarcseconds)
 -1336.74 Light Years
 -409.84 Parsecs
2007 Distance from Earth0.35 Parallax (milliarcseconds)
 9318.95 Light Years
 2857.14 Parsecs
Proper Motion Dec.-3.32 ± 0.93 milliarcseconds/year
Proper Motion RA.-0.48 ± 1.38 milliarcseconds/year
B-V Index2.50
Radial Velocity-39.00 ± 10.90 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M, C, S or Me, Ce, Se) supergiants (Mu Cep)
Mean Variability Period in Days545.000
Variable Magnitude Range (Brighter - Dimmer)8.401 - 9.875

Estimated Facts


Calculated Effective Temperature18 Kelvin

Sources and Links


SIMBAD SourceLink

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