AG Pegasi is a Wolf-Rayet star that can be located in the constellation of Pegasus. HIP107848 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD207757. AG Pegasi has alternative name(s), AG_Peg.
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 AG Pegasi, the location is 21h 51m 01.97 and +12d37`32.1 .
AG Pegasi has a spectral type of WN6 + M3III. This means the star is a Wolf-Rayet star. The star has a B-V Colour Index of 1.15 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,576 Kelvin.
AG Pegasi has an apparent magnitude of 8.48 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 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 -0.30 which gave the calculated distance to AG Pegasi as -10872.11 light years away from Earth or -3333.33 parsecs. It would take a spaceship travelling at the speed of light, -10872.11 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. AG Pegasi brightness ranges from a magnitude of 8.908 to a magnitude of 8.445 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.
|Traditional Name||AG Pegasi|
|Short Name||AG Peg|
|Hipparcos Library I.D.||107848|
|Bonner Durchmusterung||BD+11 4673|
|Henry Draper Designation||207757|
|Star Type||Wolf-Rayet star|
|Right Ascension (R.A.)||21h 51m 01.97|
|1997 Distance from Earth||-0.30 Parallax (milliarcseconds)|
|-10872.11 Light Years|
|Spectral Type||WN6 + M3III|
|Mean Variability Period in Days||0.344|
|Variable Magnitude Range (Brighter - Dimmer)||8.445 - 8.908|
|Calculated Effective Temperature||4,576 Kelvin|