13 Andromedae is a blue rotating giant star that can be located in the constellation of Andromeda. HIP115755 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD220885. 13 Andromedae has alternative name(s), 13 Andromedae , V388_And, 13 And.
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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 13 Andromedae, the location is 23h 27m 07.33 and +42 d 54`43.1 .
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 017.00 ± 000.00 towards the north and 087.00 ± 000.00 east if we saw them in the horizon.
13 Andromedae has a spectral type of B9III. This means the star is a blue coloured giant star. The star has a B-V Colour Index of 0 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,531 Kelvin.
13 Andromedae has been calculated as 2.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,531,445.22.km.
13 Andromedae has an apparent magnitude of 5.75 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 0.96 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.96. 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 11.00 which gave the calculated distance to 13 Andromedae as 296.51 light years away from us or 90.91 parsecs. In 2007, Hipparcos data was revised with a new parallax of 11.00 which put 13 Andromedae at a distance of 296.51 light years or 90.91 parsecs.
The star is a rotating Alpha2 Canum Venaticorum 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. 13 Andromedae brightness ranges from a magnitude of 6.000 to a magnitude of 6.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.0 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||13 Andromedae|
|Short Name||V388 And, 13 And|
|Alternative Name(s)||13 Andromedae|
|Hipparcos Library I.D.||115755|
|Henry Draper Designation||220885|
|Absolute Magnitude||0.96 / 0.96|
|Right Ascension (R.A.)||23h 27m 07.33|
|Declination (Dec.)||+42 d 54`43.1|
|1997 Distance||11.00 Parallax (milliarcseconds)|
|296.51 Light Years|
|2007 Distance||11.00 Parallax (milliarcseconds)|
|296.51 Light Years|
|Proper Motion Dec.||17.00 ± 0.00 milliarcseconds/year|
|Proper Motion RA.||87.00 ± 0.00 milliarcseconds/year|
|Star Type||giant star|
|Variable Star Class||Rotating|
|Variable Star Type||Alpha2 Canum Venaticorum|
|Mean Variability Period in Days||1.000|
|Radius (x the Sun)||2.20|
|Calculated Effective Temperature||9,531 Kelvin|