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BB Pegasi

BB Pegasi Facts

BB Pegasi's Alternative Names

HIP110493 is the reference name for the star in the Hipparcos Star Catalogue.

BB Pegasi has alternative name(s) :- BB Peg, BB Peg.

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

Location of BB 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 BB Pegasi, the location is 22h 22m 56.88 and +16° 19` 28.1 .

Radial Velocity and Proper Motion of BB Pegasi

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -25.56 ± 1.39 miliarcseconds/year towards the north and 20.00 ± 1.94 miliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -28.90 km/s with an error of about 1.40 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour) of BB Pegasi

BB Pegasi Colour and Temperature

BB Pegasi has a spectral type of F8. This means the star is a blue to white variable star.

BB Pegasi Apparent and Absolute Magnitudes

BB Pegasi has an apparent magnitude of 11.20 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 3.60 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.59. 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 Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.02 which gave the calculated distance to BB Pegasi as 1080.01 light years away from Earth or 331.13 parsecs. It would take a spaceship travelling at the speed of light, 1080.01 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 4.77 which put BB Pegasi at a distance of 683.78 light years or 209.64 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Using the 2007 distance, the star is roughly 43,241,052.67 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.

Variable Type of BB Pegasi

The star is a eclipsing W Ursae Majoris/Cont 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 Pegasi brightness ranges from a magnitude of 11.731 to a magnitude of 11.055 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 BB Pegasi Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBB Pegasi
Alternative NamesBB Peg, HIP 110493, BB Peg
Spectral TypeF8
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
ConstellationPegasus
Absolute Magnitude 3.60 / 4.59
Visual / Apparent Magnitude11.20
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)22h 22m 56.88
Declination (Dec.)+16° 19` 28.1
Galactic Latitude-33.56 degrees
Galactic Longitude78.90 degrees
1997 Distance from Earth3.02 Parallax (milliarcseconds)
 1080.01 Light Years
 331.13 Parsecs
2007 Distance from Earth4.77 Parallax (milliarcseconds)
  683.78 Light Years
 209.64 Parsecs
 43,241,052.67 Astronomical Units
Proper Motion Dec.-25.56 ± 1.39 milliarcseconds/year
Proper Motion RA.20.00 ± 1.94 milliarcseconds/year
B-V Index-99.00
Radial Velocity-28.90 ± 1.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeW Ursae Majoris/Cont
Mean Variability Period in Days0.362
Variable Magnitude Range (Brighter - Dimmer)11.055 - 11.731

Sources and Links


SIMBAD SourceLink

Related Stars


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