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VW Cassiopeiae, HIP5138

VW Cassiopeiae is a blue to white pulsating variable star that can be located in the constellation of Cassiopeia. The description is based on the spectral class. VW Cassiopeiae is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

VW Cassiopeiae's Alternative Names

HIP5138 is the reference name for the star in the Hipparcos Star Catalogue.

VW Cassiopeiae has alternative name(s) :- , VW Cas.

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

Location of VW 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 VW Cassiopeiae, the location is 01h 05m 48.23 and +61° 45` 17.8 .

Physical Properties (Colour, Temperature) of VW Cassiopeiae

VW Cassiopeiae has a spectral type of F9. This means the star is a blue to white variable star. The star has a B-V Colour Index of 0.94 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,105 Kelvin.

VW Cassiopeiae Apparent and Absolute Magnitudes

VW Cassiopeiae has an apparent magnitude of 10.68 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 VW Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.12 which gave the calculated distance to VW Cassiopeiae as -1538.51 light years away from Earth or -471.70 parsecs. It would take a spaceship travelling at the speed of light, -1538.51 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of VW 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. VW Cassiopeiae brightness ranges from a magnitude of 11.274 to a magnitude of 10.556 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 6.0 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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VW Cassiopeiae Facts

Visual Facts


Primary / Proper / Traditional NameVW Cassiopeiae
Alternative NamesHIP 5138, VW Cas
Spectral TypeF9
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue to white
GalaxyMilky Way
ConstellationCassiopeia
Visual / Apparent Magnitude10.68
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)01h 05m 48.23
Declination (Dec.)+61° 45` 17.8
Galactic Latitude-1.07 degrees
Galactic Longitude124.63 degrees
Distance from Earth-2.12 Parallax (milliarcseconds)
 -1538.51 Light Years
 -471.70 Parsecs
B-V Index0.94
Radial Velocity-58.50 ± 3.40 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 Days5.994
Variable Magnitude Range (Brighter - Dimmer)10.556 - 11.274

Estimated Facts


Calculated Effective Temperature5,105 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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