Universe Guide

BC Pegasi

BC Pegasi Facts

  • BC Pegasi is a pulsating variable star that can be located in the constellation of Pegasus. The description is based on the spectral class.
  • BC Pegasi is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M6) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -3545.25 light years away from us. Distance

BC Pegasi's Alternative Names

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 .

Location of BC Pegasi

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 .

Physical Properties of BC Pegasi

BC Pegasi Colour and Temperature

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 Apparent and Absolute Magnitudes

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.

Distance to BC Pegasi

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.

Variable Type of BC Pegasi

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).

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 BC Pegasi Facts and Figures

Visual Facts

Primary / Proper / Traditional NameBC Pegasi
Alternative NamesHIP 112057, BD+20 5207, BC Peg
Spectral TypeM6
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Visual / Apparent Magnitude9.80
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)22h 41m 48.38
Declination (Dec.)+21° 10` 12.6
Galactic Latitude-32.41130317 degrees
Galactic Longitude86.63335322 degrees
Distance from Earth-0.92000 Parallax (milliarcseconds)
 -3545.25 Light Years
 -1086.96 Parsecs
 -224,200,031.55 Astronomical Units
B-V Index1.21
Radial Velocity-13.00000 ± 4.70 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M
Mean Variability Period in Days0.386
Variable Magnitude Range (Brighter - Dimmer)8.903 - 9.362

Estimated Calculated Facts

Effective Temperature4,549 Kelvin

Sources and Links

SIMBAD SourceLink

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