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BI Pegasi

BI Pegasi Facts

BI Pegasi's Alternative Names

HIP113390 is the reference name for the star in the Hipparcos Star Catalogue.

BI Pegasi has alternative name(s) :- , BI 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+17 4841.

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

Location of BI 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 BI Pegasi, the location is 22h 57m 51.75 and +18° 01` 00.9 .

Physical Properties (Colour, Temperature) of BI Pegasi

BI Pegasi has a spectral type of M6e. This means the star is a red variable star. The star has a B-V Colour Index of 1.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,014 Kelvin.

BI Pegasi Apparent and Absolute Magnitudes

BI Pegasi has an apparent magnitude of 10.45 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 BI Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.26 which gave the calculated distance to BI Pegasi as -12544.74 light years away from Earth or -3846.15 parsecs. It would take a spaceship travelling at the speed of light, -12544.74 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of BI Pegasi

The star is a pulsating Semi-Regular Star w 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. BI Pegasi brightness ranges from a magnitude of 10.342 to a magnitude of 9.718 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 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 BI Pegasi Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBI Pegasi
Alternative NamesHIP 113390, BD+17 4841, BI Peg
Spectral TypeM6e
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationPegasus
Visual / Apparent Magnitude10.45
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)22h 57m 51.75
Declination (Dec.)+18° 01` 00.9
Galactic Latitude-37.12 degrees
Galactic Longitude88.38 degrees
Distance from Earth-0.26 Parallax (milliarcseconds)
 -12544.74 Light Years
 -3846.15 Parsecs
 -793,319,856.62 Astronomical Units
B-V Index1.50
Radial Velocity-28.20 ± 0.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.556
Variable Magnitude Range (Brighter - Dimmer)9.718 - 10.342

Estimated Calculated Facts


Effective Temperature4,014 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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