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V801 Cassiopeiae, HD19243, HIP14626

V801 Cassiopeiae is a blue eruptive main sequence dwarf 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.

V801 Cassiopeiae's Alternative Names

HIP14626 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD19243.

V801 Cassiopeiae has alternative name(s) :- , V801 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+61 525.

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

Location of V801 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 V801 Cassiopeiae, the location is 03h 08m 54.18 and +62° 23` 04.5 .

Proper Motion of V801 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 0.21 ± 0.41 miliarcseconds/year towards the north and -3.26 ± 0.75 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 -24.70000 km/s with an error of about 2.90 km/s .

Physical Properties (Colour, Temperature) of V801 Cassiopeiae

V801 Cassiopeiae has a spectral type of B1V:e. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of 0.23 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,593 Kelvin.

V801 Cassiopeiae Radius has been calculated as being 16.91 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 11,764,822.47.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 21.78. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V801 Cassiopeiae Apparent and Absolute Magnitudes

V801 Cassiopeiae has an apparent magnitude of 6.47 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 -2.48 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.03. 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 V801 Cassiopeiae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.62 which gave the calculated distance to V801 Cassiopeiae as 2013.35 light years away from Earth or 617.28 parsecs. It would take a spaceship travelling at the speed of light, 2013.35 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 1.26 which put V801 Cassiopeiae at a distance of 2588.60 light years or 793.65 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 V801 Cassiopeiae

The star is a eruptive 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. V801 Cassiopeiae brightness ranges from a magnitude of 6.575 to a magnitude of 6.477 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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V801 Cassiopeiae Facts

Visual Facts

Alternative NamesHD 19243, HIP 14626, BD+61 525, V801 Cas
Star Type main sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude-2.48 / -3.03
Visual / Apparent Magnitude6.47
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 08m 54.18
Declination (Dec.)+62° 23` 04.5
Galactic Latitude3.64 degrees
Galactic Longitude138.13 degrees
1997 Distance from Earth1.62 Parallax (milliarcseconds)
 2013.35 Light Years
 617.28 Parsecs
2007 Revised Distance from Earth1.26 Parallax (milliarcseconds)
 2588.60 Light Years
 793.65 Parsecs
Proper Motion Dec.0.21 ± 0.41 milliarcseconds/year
Proper Motion RA.-3.26 ± 0.75 milliarcseconds/year
B-V Index0.23
Radial Velocity-24.70 ± 2.90 km/s
Spectral TypeB1V:e
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.085
Variable Magnitude Range (Brighter - Dimmer)6.477 - 6.575

Estimated Facts

Calculated Effective Temperature7,593 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
19243+61 525.0A6.60000-2.000000.00000B1Blue/White

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