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V755 Cassiopeiae, HD3940, HIP3367

V755 Cassiopeiae is a blue eclipsing binary sys supergiant star that can be located in the constellation of Cassiopeia. The description is based on the spectral class. V755 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.

V755 Cassiopeiae's Alternative Names

HIP3367 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD3940.

V755 Cassiopeiae has alternative name(s) :- , V755 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 81.

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

Location of V755 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 V755 Cassiopeiae, the location is 00h 42m 50.07 and +64° 17` 28.6 .

Radial Velocity and Proper Motion of V755 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 -0.48 ± 0.35 miliarcseconds/year towards the north and -3.59 ± 0.54 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 the Sun is -58.20 km/s with an error of about 1.90 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of V755 Cassiopeiae

V755 Cassiopeiae has a spectral type of A1Ia. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,875 Kelvin.

V755 Cassiopeiae Radius has been calculated as being 71.60 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 49,821,439.01.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 36.22. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.39 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

V755 Cassiopeiae Apparent and Absolute Magnitudes

V755 Cassiopeiae has an apparent magnitude of 7.28 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 -4.50 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.02. 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 V755 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.44 which gave the calculated distance to V755 Cassiopeiae as 7412.80 light years away from Earth or 2272.73 parsecs. It would take a spaceship travelling at the speed of light, 7412.80 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 0.87 which put V755 Cassiopeiae at a distance of 3749.00 light years or 1149.43 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.

Using the 2007 distance, the star is roughly 237,085,304.21 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Variable Type of V755 Cassiopeiae

The star is a eclipsing binary sys Beta Persei (Algol) 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. V755 Cassiopeiae brightness ranges from a magnitude of 7.443 to a magnitude of 7.378 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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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V755 Cassiopeiae Facts

Visual Facts


Primary / Proper / Traditional NameV755 Cassiopeiae
Alternative NamesHD 3940, HIP 3367, BD+63 81, V755 Cas
Spectral TypeA1Ia
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationCassiopeia
Absolute Magnitude -4.50 / -3.02
Visual / Apparent Magnitude7.28
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)00h 42m 50.07
Declination (Dec.)+64° 17` 28.6
Galactic Latitude1.44 degrees
Galactic Longitude122.00 degrees
1997 Distance from Earth0.44 Parallax (milliarcseconds)
 7412.80 Light Years
 2272.73 Parsecs
2007 Distance from Earth0.87 Parallax (milliarcseconds)
 3749.00 Light Years
 1149.43 Parsecs
 237,085,304.21 Astronomical Units
Proper Motion Dec.-0.48 ± 0.35 milliarcseconds/year
Proper Motion RA.-3.59 ± 0.54 milliarcseconds/year
B-V Index0.60
Radial Velocity-58.20 ± 1.90 km/s
Iron Abundance-0.39 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Persei (Algol)
Mean Variability Period in Days0.042
Variable Magnitude Range (Brighter - Dimmer)7.378 - 7.443

Estimated Facts


Calculated Effective Temperature5,875 Kelvin

Sources and Links


SIMBAD SourceLink

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