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BR Canum Venaticorum, HD116475, HIP65309

BR Canum Venaticorum is a red pulsating giant star that can be located in the constellation of Canes Venatici. The description is based on the spectral class. BR Canum Venaticorum 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.

BR Canum Venaticorum's Alternative Names

HIP65309 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD116475.

BR Canum Venaticorum has alternative name(s) :- , BR CVn.

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+47 2053.

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

Location of BR Canum Venaticorum

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 BR Canum Venaticorum, the location is 13h 23m 05.50 and +47° 00` 07.0 .

Radial Velocity and Proper Motion of BR Canum Venaticorum

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 16.72 ± 0.34 miliarcseconds/year towards the north and -15.31 ± 0.43 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 -11.71 km/s with an error of about 0.75 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.

BR Canum Venaticorum 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 602.16 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of BR Canum Venaticorum

BR Canum Venaticorum has a spectral type of M4III:. This means the star is a red giant star. The star is 7,440.00 Parsecs from the Galactic Centre or terms of Light Years is 24,266.55 s. The star has a B-V Colour Index of 1.55 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,892 Kelvin.

BR Canum Venaticorum Radius has been calculated as being 38.42 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 26,733,481.39.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 30.38. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

BR Canum Venaticorum Apparent and Absolute Magnitudes

BR Canum Venaticorum has an apparent magnitude of 6.64 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 -0.85. 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 BR Canum Venaticorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.51 which gave the calculated distance to BR Canum Venaticorum as 1299.46 light years away from Earth or 398.41 parsecs. It would take a spaceship travelling at the speed of light, 1299.46 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 3.17 which put BR Canum Venaticorum at a distance of 1028.91 light years or 315.46 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 65,067,842.38 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.

The star's Galacto-Centric Distance is 7,440.00 Parsecs or 24,266.55 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of BR Canum Venaticorum

The star is a pulsating Slow 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. BR Canum Venaticorum brightness ranges from a magnitude of 6.791 to a magnitude of 6.475 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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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BR Canum Venaticorum Facts

Visual Facts


Primary / Proper / Traditional NameBR Canum Venaticorum
Alternative NamesHD 116475, HIP 65309, BD+47 2053, BR CVn
Spectral TypeM4III:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
ConstellationCanes Venatici
Absolute Magnitude -1.36 / -0.85
Visual / Apparent Magnitude6.64
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 23m 05.50
Declination (Dec.)+47° 00` 07.0
Galactic Latitude69.17 degrees
Galactic Longitude107.62 degrees
1997 Distance from Earth2.51 Parallax (milliarcseconds)
 1299.46 Light Years
 398.41 Parsecs
2007 Distance from Earth3.17 Parallax (milliarcseconds)
 1028.91 Light Years
 315.46 Parsecs
 65,067,842.38 Astronomical Units
Galacto-Centric Distance24,266.55 Light Years / 7,440.00 Parsecs
Proper Motion Dec.16.72 ± 0.34 milliarcseconds/year
Proper Motion RA.-15.31 ± 0.43 milliarcseconds/year
B-V Index1.55
Radial Velocity-11.71 ± 0.75 km/s
Eccentricity0.19
Semi-Major Axis8753.00
Stellar Luminosity (Lsun)602.16

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.268
Variable Magnitude Range (Brighter - Dimmer)6.475 - 6.791

Estimated Facts


Calculated Effective Temperature3,892 Kelvin

Sources and Links


SIMBAD SourceLink

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