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GP Cassiopeiae

GP Cassiopeiae Facts

GP Cassiopeiae's Alternative Names

HIP12416 is the reference name for the star in the Hipparcos Star Catalogue.

GP Cassiopeiae has alternative name(s) :- , GP 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+58 501.

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

Location of GP Cassiopeiae

The location of the supergiant 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 object is compared to the celestial equator and is expressed in degrees. For GP Cassiopeiae, the location is 02h 39m 50.44 and +59° 35` 51.3 .

Physical Properties (Colour, Temperature) of GP Cassiopeiae

GP Cassiopeiae has a spectral type of M2Iab. This means the star is a red supergiant star. The star has a B-V Colour Index of 2.41 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 73 Kelvin.

GP Cassiopeiae Apparent and Absolute Magnitudes

GP Cassiopeiae has an apparent magnitude of 9.41 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 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 GP Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.73 which gave the calculated distance to GP Cassiopeiae as -4467.99 light years away from Earth or -1369.86 parsecs. It would take a spaceship travelling at the speed of light, -4467.99 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of GP Cassiopeiae

The star is a pulsating Slow Irregular 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. GP Cassiopeiae brightness ranges from a magnitude of 9.394 to a magnitude of 9.118 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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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Additional GP Cassiopeiae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameGP Cassiopeiae
Alternative NamesHIP 12416, BD+58 501, GP Cas
Spectral TypeM2Iab
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourRed
GalaxyMilky Way
ConstellationCassiopeia
Visual / Apparent Magnitude9.41
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 39m 50.44
Declination (Dec.)+59° 35` 51.3
Galactic Latitude-0.44 degrees
Galactic Longitude136.26 degrees
Distance from Earth-0.73 Parallax (milliarcseconds)
 -4467.99 Light Years
 -1369.86 Parsecs
 -282,551,938.64 Astronomical Units
B-V Index2.41
Radial Velocity-43.05 ± 0.73 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.240
Variable Magnitude Range (Brighter - Dimmer)9.118 - 9.394

Estimated Calculated Facts


Effective Temperature73 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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