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V509 Cassiopeiae - HD217476 - HIP113561

V509 Cassiopeiae is a white to yellow pulsating very luminous supergiant star that can be located in the constellation of Cassiopeia. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP113561 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD217476.

V509 Cassiopeiae has alternative name(s), V509_Cas.

Location of V509 Cassiopeiae

The location of the star in the galaxy 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 V509 Cassiopeiae, the location is 23h 00m 05.10 and +56d56`43.4 .

Proper Motion of V509 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 -2.60 ± 0.20 miliarcseconds/year towards the north and -2.24 ± 0.25 miliarcseconds/year east if we saw them in the horizon.

V509 Cassiopeiae Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 9600.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of V509 Cassiopeiae

V509 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 1.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,951 Kelvin. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V509 Cassiopeiae Apparent and Absolute Magnitudes

V509 Cassiopeiae has an apparent magnitude of 5.10 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 -5.58. 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 V509 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.15 which gave the calculated distance to V509 Cassiopeiae as -21744.22 light years away from Earth or -6666.67 parsecs. It would take a spaceship travelling at the speed of light, -21744.22 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 0.73 which put V509 Cassiopeiae at a distance of 4467.99 light years or 1369.86 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 V509 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. V509 Cassiopeiae brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

V509 Cassiopeiae Facts

Alternative Names

Traditional/Proper NameV509 Cassiopeiae
Short NameV509 Cas
Hipparcos Library I.D.113561
Bonner DurchmusterungBDD+56 2923
Henry Draper Designation217476

Visual Facts

Star Typesupergiant star
Visual / Apparent Magnitude5.10
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)23h 00m 05.10
Declination (Dec.)+56d56`43.4
Galactic Latitude-2.70 degrees
Galactic Longitude108.16 degrees
1997 Distance from Earth-0.15 Parallax (milliarcseconds)
 -21744.22 Light Years
 -6666.67 Parsecs
2007 Revised Distance from Earth0.73 Parallax (milliarcseconds)
 4467.99 Light Years
 1369.86 Parsecs
Proper Motion Dec.-2.60 ± 0.20 milliarcseconds/year
Proper Motion RA.-2.24 ± 0.25 milliarcseconds/year
B-V Index1.01
Radial Velocity-50.20 ± 0.70 km/s
Spectral TypeG0Ia
Colour(G) White to Yellow

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

Estimated Facts

Luminosity (x the Sun)9,600.0000000
Calculated Effective Temperature4,951 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars


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