Universe Guide

13 Pegasi - HD207652 - HIP107788

13 Pegasi is a blue to white subgiant star that can be located in the constellation of Pegasus. HIP107788 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD207652. The Id of the star in the Gould Star Catalogue is 6. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. 13 Pegasi has alternative name(s), 13 Pegasi , 13 Peg. 13 Pegasi is a multiple star system with 2 stars orbiting in its solar system.

Location of 13 Pegasi

The location of the star in the galaxy 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 13 Pegasi, the location is 21h 50m 08.64 and +17 d 17 ` 09.4 .

Proper Motion of 13 Pegasi

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 -044.00 ± 000.00 towards the north and 092.00 ± 001.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 13 Pegasi

13 Pegasi has a spectral type of F2III-IV. This means the star is a blue to white coloured subgiant star. The star has a B-V Colour Index of 0.39 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,775 Kelvin.

13 Pegasi has been calculated as 1.93 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,341,350.97.km.

13 Pegasi Apparent and Absolute Magnitudes

13 Pegasi has an apparent magnitude of 5.34 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 2.73 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.73. 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 13 Pegasi

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 30.00 which gave the calculated distance to 13 Pegasi as 108.72 light years away from Earth or 33.33 parsecs. In 2007, Hipparcos data was revised with a new parallax of 30.00 which put 13 Pegasi at a distance of 108.72 light years or 33.33 parsecs.

It would take a spaceship travelling at the speed of light, 108.72 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

13 Pegasi Facts


Traditional Name13 Pegasi
Short Name13 Peg
Alternative Name(s)13 Pegasi
Hipparcos Library I.D.107788
Bonner DurchmusterungBD+16 4612
Gould I.D.6
Henry Draper Designation207652
Celestial TypeStar
Absolute Magnitude2.73 / 2.73
Apparent Magnitude5.34
Right Ascension (R.A.)21h 50m 08.64
Declination (Dec.)+17 d 17 ` 09.4
1997 Distance from Earth30.00 Parallax (milliarcseconds)
 108.72 Light Years
 33.33 Parsecs
2007 Distance from Earth30.00 Parallax (milliarcseconds)
 108.72 Light Years
 33.33 Parsecs
Proper Motion Dec.-44.00 ± 0.00 milliarcseconds/year
Proper Motion RA.92.00 ± 1.00 milliarcseconds/year
B-V Index0.39
Spectral TypeF2III-IV
Colour(F) blue to white
Star Typesubgiant star
Stars in Solar System2
Radius (x the Sun)1.93
Calculated Effective Temperature6,775 Kelvin


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