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BB Virginis

BB Virginis Facts

BB Virginis's Alternative Names

HIP67653 is the reference name for the star in the Hipparcos Star Catalogue.

BB Virginis has alternative name(s) :- BB Vir, BB Vir.

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+07 2708.

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

Location of BB Virginis

The location of the variable 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 object is compared to the celestial equator and is expressed in degrees. For BB Virginis, the location is 13h 51m 40.81 and +06° 25` 51.4 .

Physical Properties (Colour, Temperature) of BB Virginis

BB Virginis Colour and Temperature

BB Virginis has a spectral type of A2. This means the star is a blue variable star. The star has a B-V Colour Index of 0.02 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,824 Kelvin.

BB Virginis Radius

Radius has been calculated as being 1.68 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,166,264.84.km. If you need the diameter of the star, you just need to multiple the radius by 2. 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 -1.56 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

BB Virginis Apparent and Absolute Magnitudes

BB Virginis has an apparent magnitude of 11.38 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 1.42 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 BB Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.02 which gave the calculated distance to BB Virginis as 3197.68 light years away from Earth or 980.39 parsecs. It would take a spaceship travelling at the speed of light, 3197.68 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of BB Virginis

The star is a pulsating RR Lyrae type with a 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. BB Virginis brightness ranges from a magnitude of 11.553 to a magnitude of 10.752 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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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Additional BB Virginis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBB Virginis
Alternative NamesBB Vir, HIP 67653, BD+07 2708, BB Vir
Spectral TypeA2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourBlue
GalaxyMilky Way
ConstellationVirgo
Absolute Magnitude 1.42
Visual / Apparent Magnitude11.38
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)13h 51m 40.81
Declination (Dec.)+06° 25` 51.4
Galactic Latitude64.83 degrees
Galactic Longitude340.32 degrees
Distance from Earth1.02 Parallax (milliarcseconds)
 3197.68 Light Years
 980.39 Parsecs
 202,218,544.32 Astronomical Units
B-V Index0.02
Radial Velocity-5.00 ± 7.40 km/s
Iron Abundance-1.56 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with a
Mean Variability Period in Days0.471
Variable Magnitude Range (Brighter - Dimmer)10.752 - 11.553

Estimated Calculated Facts


Radius (x the Sun)1.68
Effective Temperature9,824 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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