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V809 Cassiopeiae, HD219978, HIP115141

V809 Cassiopeiae is a orange to red 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.

V809 Cassiopeiae's Alternative Names

HIP115141 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD219978.

V809 Cassiopeiae has alternative name(s) :- , V809 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 2423.

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

Location of V809 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 V809 Cassiopeiae, the location is 23h 19m 23.77 and +62° 44` 23.2 .

Proper Motion of V809 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 -2.86 ± 0.32 miliarcseconds/year towards the north and -0.98 ± 0.40 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 -25.78000 km/s with an error of about 0.25 km/s .

Physical Properties (Colour, Temperature) of V809 Cassiopeiae

V809 Cassiopeiae has a spectral type of K5Ibvar. This means the star is a orange to red supergiant star. The star has a B-V Colour Index of 2.28 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 327 Kelvin.

V809 Cassiopeiae Radius has been calculated as being 5,647.06 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,929,221,051.10.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 8162.63. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V809 Cassiopeiae Apparent and Absolute Magnitudes

V809 Cassiopeiae has an apparent magnitude of 6.66 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 -1.44 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.24. 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 V809 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.40 which gave the calculated distance to V809 Cassiopeiae as 1359.01 light years away from Earth or 416.67 parsecs. It would take a spaceship travelling at the speed of light, 1359.01 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 1.66 which put V809 Cassiopeiae at a distance of 1964.84 light years or 602.41 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 V809 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. V809 Cassiopeiae brightness ranges from a magnitude of 6.713 to a magnitude of 6.579 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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V809 Cassiopeiae Facts

Visual Facts


Primary / Proper / Traditional NameV809 Cassiopeiae
Alternative NamesHD 219978, HIP 115141, BD+61 2423, V809 Cas
Spectral TypeK5Ibvar
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour orange to red
GalaxyMilky Way
ConstellationCassiopeia
Absolute Magnitude-1.44 / -2.24
Visual / Apparent Magnitude6.66
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)23h 19m 23.77
Declination (Dec.)+62° 44` 23.2
Galactic Latitude1.73 degrees
Galactic Longitude112.61 degrees
1997 Distance from Earth2.40 Parallax (milliarcseconds)
 1359.01 Light Years
 416.67 Parsecs
2007 Distance from Earth1.66 Parallax (milliarcseconds)
 1964.84 Light Years
 602.41 Parsecs
Proper Motion Dec.-2.86 ± 0.32 milliarcseconds/year
Proper Motion RA.-0.98 ± 0.40 milliarcseconds/year
B-V Index2.28
Radial Velocity-25.78 ± 0.25 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 Days0.111
Variable Magnitude Range (Brighter - Dimmer)6.579 - 6.713

Estimated Facts


Calculated Effective Temperature327 Kelvin

Sources and Links


SIMBAD SourceLink

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