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V487 Cassiopeiae, HD6474, HIP5239

V487 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.

V487 Cassiopeiae's Alternative Names

HIP5239 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD6474.

V487 Cassiopeiae has alternative name(s) :- , V487 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+63 141.

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

Location of V487 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 V487 Cassiopeiae, the location is 01h 06m 59.74 and +63° 46` 23.4 .

Proper Motion of V487 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 -1.29 ± 0.53 miliarcseconds/year towards the north and -1.32 ± 0.80 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature) of V487 Cassiopeiae

V487 Cassiopeiae has a spectral type of G0Ia. This means the star is a white to yellow supergiant star. The star has a B-V Colour Index of 1.4 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,209 Kelvin.

V487 Cassiopeiae Apparent and Absolute Magnitudes

V487 Cassiopeiae has an apparent magnitude of 7.54 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 -8.57. 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 V487 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 V487 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 0.06 which put V487 Cassiopeiae at a distance of 54360.56 light years or 16666.67 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 V487 Cassiopeiae

The star is a pulsating Semiregular giants and supergiants of F, G, or K spectral s, sometimes with emission lines in their spectral 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. V487 Cassiopeiae brightness ranges from a magnitude of 7.736 to a magnitude of 7.601 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 99.6 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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V487 Cassiopeiae Facts

Visual Facts


Primary / Proper / Traditional NameV487 Cassiopeiae
Alternative NamesHD 6474, HIP 5239, BD+63 141, V487 Cas
Spectral TypeG0Ia
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationCassiopeia
Visual / Apparent Magnitude7.54
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 06m 59.74
Declination (Dec.)+63° 46` 23.4
Galactic Latitude0.95 degrees
Galactic Longitude124.65 degrees
1997 Distance from Earth-0.20 Parallax (milliarcseconds)
 -16308.17 Light Years
 -5000 Parsecs
2007 Distance from Earth0.06 Parallax (milliarcseconds)
 54360.56 Light Years
 16666.67 Parsecs
Proper Motion Dec.-1.29 ± 0.53 milliarcseconds/year
Proper Motion RA.-1.32 ± 0.80 milliarcseconds/year
B-V Index1.40

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemiregular giants and supergiants of F, G, or K spectral s, sometimes with emission lines in their spectral
Mean Variability Period in Days99.570
Variable Magnitude Range (Brighter - Dimmer)7.601 - 7.736

Estimated Facts


Calculated Effective Temperature4,209 Kelvin

Sources and Links


SIMBAD SourceLink

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