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V Coronae Borealis, HD141826, HIP77501

V Coronae Borealis is a pulsating star that can be located in the constellation of CoronaBorealis. The star can not be seen by the naked eye, you need a telescope to see it.

HIP77501 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD141826.

V Coronae Borealis has alternative name(s), V CrB.

Location of V Coronae Borealis

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 V Coronae Borealis, the location is 15h 49m 31.31 and +39d 34` 18.0 .

Proper Motion of V Coronae Borealis

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 -12.45 ± 0.87 miliarcseconds/year towards the north and 4.60 ± 1.08 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 -115.00000 km/s with an error of about 1.30 km/s .

Physical Properties (Temperature, Radius) of V Coronae Borealis

V Coronae Borealis has a spectral type of N2. This means the star is a star. The star has a B-V Colour Index of 4.41 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 0 Kelvin. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V Coronae Borealis Apparent and Absolute Magnitudes

V Coronae Borealis has an apparent magnitude of 10.10 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 -1.36 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.06. 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 V Coronae Borealis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.51 which gave the calculated distance to V Coronae Borealis as 6395.36 light years away from Earth or 1960.78 parsecs. It would take a spaceship travelling at the speed of light, 6395.36 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 0.37 which put V Coronae Borealis at a distance of 8815.23 light years or 2702.70 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 V Coronae Borealis

The star is a pulsating Omicron Ceti 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. V Coronae Borealis brightness ranges from a magnitude of 9.909 to a magnitude of 7.864 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 358.0 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.

V Coronae Borealis Facts

Alternative Names

Traditional/Proper NameV Coronae Borealis
Short NameV CrB
Hipparcos Library I.D.77501
Bonner DurchmusterungBD+40 2929
Henry Draper Designation141826

Visual Facts

Star Type star
ConstellationCorona Borealis
Absolute Magnitude-1.36 / -2.06
Visual / Apparent Magnitude10.10
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)15h 49m 31.31
Declination (Dec.)+39d 34` 18.0
Galactic Latitude51.23 degrees
Galactic Longitude63.27 degrees
1997 Distance from Earth0.51 Parallax (milliarcseconds)
 6395.36 Light Years
 1960.78 Parsecs
2007 Revised Distance from Earth0.37 Parallax (milliarcseconds)
 8815.23 Light Years
 2702.70 Parsecs
Proper Motion Dec.-12.45 ± 0.87 milliarcseconds/year
Proper Motion RA.4.60 ± 1.08 milliarcseconds/year
B-V Index4.41
Radial Velocity-115.00 ± 1.30 km/s
Spectral TypeN2

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days358.000
Variable Magnitude Range (Brighter - Dimmer)7.864 - 9.909

Estimated Facts

Sources and Links

SIMBAD SourceLink

Related Stars

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