HIP112057 is the reference name for the star in the Hipparcos Star Catalogue.
BC Pegasi has alternative name(s) :- , BC Peg.
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+20 5207.
More details on objects' alternative names can be found at Star Names .
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 BC Pegasi, the location is 22h 41m 48.38 and +21° 10` 12.6 .
Based on the star's spectral type of M6 , BC Pegasi's colour and type is red variable star. The star has a B-V Colour Index of 1.21 which means the star's temperature is about 4,549 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.
BC Pegasi has an apparent magnitude of 9.80 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 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.
Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.92000 which gave the calculated distance to BC Pegasi as -3545.25 light years away from Earth or -1086.96 parsecs. If you want that in miles, it is about -20,841,196,604,279,193.35, based on 1 Ly = 5,878,625,373,183.61 miles.
The star is a pulsating Semiregular late- (M 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. BC Pegasi brightness ranges from a magnitude of 9.362 to a magnitude of 8.903 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.4 days (variability).
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.
|Primary / Proper / Traditional Name||BC Pegasi|
|Alternative Names||HIP 112057, BD+20 5207, BC Peg|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Variable Star|
|Visual / Apparent Magnitude||9.80|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||22h 41m 48.38|
|Declination (Dec.)||+21° 10` 12.6|
|Galactic Latitude||-32.41130317 degrees|
|Galactic Longitude||86.63335322 degrees|
|Distance from Earth||-0.92000 Parallax (milliarcseconds)|
|-3545.25 Light Years|
|-224,200,031.55 Astronomical Units|
|Radial Velocity||-13.00000 ± 4.70 km/s|
|Variable Star Class||Pulsating|
|Variable Star Type||Semiregular late- (M|
|Mean Variability Period in Days||0.386|
|Variable Magnitude Range (Brighter - Dimmer)||8.903 - 9.362|
|Effective Temperature||4,549 Kelvin|
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