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+09 2573a.
More details on star alternative names can be found at Star Names .
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 X Virginis, the location is 12h 01m 51.40 and +09° 04` 20.08 .
X Virginis has a spectral type of F8 D. This means the star is a blue to white star.
X Virginis has an apparent magnitude of 7.30 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 -0.26 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.
The Parallax of the star is given as 3.07 which gives a calculated distance to X Virginis of 1062.42 light years from the Earth or 325.73 parsecs. It would take a spaceship travelling at the speed of light, 1062.42 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.
The star is roughly 67,186,167.18 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.
|Primary / Proper / Traditional Name||X Virginis|
|Alternative Names||BD+09 2573a|
|Spectral Type||F8 D|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Colour||blue to white|
|Visual / Apparent Magnitude||7.30|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||12h 01m 51.40|
|Declination (Dec.)||+09° 04` 20.08|
|Distance from Earth||3.07 Parallax (milliarcseconds)|
|1062.42 Light Years|
|67,186,167.18 Astronomical Units|