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V636 Cassiopeiae, HD9250, HIP7192

V636 Cassiopeiae is a white to yellow pulsating supergiant star that can be located in the constellation of Cassiopeia. 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.

V636 Cassiopeiae's Alternative Names

HIP7192 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD9250.

V636 Cassiopeiae has alternative name(s) :- , V636 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+62 264.

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

Location of V636 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 V636 Cassiopeiae, the location is 01h 32m 43.23 and +63° 35` 37.7 .

Proper Motion of V636 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 0.03 ± 0.42 miliarcseconds/year towards the north and -0.54 ± 0.62 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 -25.00000 km/s with an error of about 0.30 km/s .

Physical Properties (Colour, Temperature) of V636 Cassiopeiae

V636 Cassiopeiae has a spectral type of G0Ib. This means the star is a white to yellow supergiant star. The star has a B-V Colour Index of 1.3 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,386 Kelvin.

V636 Cassiopeiae Radius has been calculated as being 34.42 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 23,947,858.11.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 29.84. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V636 Cassiopeiae Apparent and Absolute Magnitudes

V636 Cassiopeiae has an apparent magnitude of 7.18 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 -1.64 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.33. 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 V636 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.72 which gave the calculated distance to V636 Cassiopeiae as 1896.30 light years away from Earth or 581.40 parsecs. It would take a spaceship travelling at the speed of light, 1896.30 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 1.99 which put V636 Cassiopeiae at a distance of 1639.01 light years or 502.51 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 V636 Cassiopeiae

The star is a pulsating Delta Cepheid 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. V636 Cassiopeiae brightness ranges from a magnitude of 7.411 to a magnitude of 7.237 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 8.4 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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V636 Cassiopeiae Facts

Visual Facts


Primary / Proper / Traditional NameV636 Cassiopeiae
Alternative NamesHD 9250, HIP 7192, BD+62 264, V636 Cas
Spectral TypeG0Ib
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationCassiopeia
Absolute Magnitude-1.64 / -1.33
Visual / Apparent Magnitude7.18
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 32m 43.23
Declination (Dec.)+63° 35` 37.7
Galactic Latitude1.09 degrees
Galactic Longitude127.50 degrees
1997 Distance from Earth1.72 Parallax (milliarcseconds)
 1896.30 Light Years
 581.40 Parsecs
2007 Distance from Earth1.99 Parallax (milliarcseconds)
 1639.01 Light Years
 502.51 Parsecs
Proper Motion Dec.0.03 ± 0.42 milliarcseconds/year
Proper Motion RA.-0.54 ± 0.62 milliarcseconds/year
B-V Index1.30
Radial Velocity-25.00 ± 0.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days8.376
Variable Magnitude Range (Brighter - Dimmer)7.237 - 7.411

Estimated Facts


Calculated Effective Temperature4,386 Kelvin

Sources and Links


SIMBAD SourceLink

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