Universe Guide

13 Andromedae - HD220885 - HIP115755

13 Andromedae is a blue rotating giant star that can be located in the constellation of Andromeda. HIP is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD. 13 Andromedae has alternative name(s), 13 Andromedae.

Location of 13 Andromedae

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 .

Physical Properties/View of 13 Andromedae

13 Andromedae has a spectral type of B9III. This means the star is (B) blue coloured (III) giant. 13 Andromedae lies at a distance of 294.11 light years away from our Sun and our planet Earth or to put it another way, 90.14 parsecs away from the Sun.

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. 13 Andromedae has an absolute magnitude of 0.97 which is the apparent magnitude of an object if it were 32.6 light years away or 10 parsecs from Earth. 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. The star's temperature has been calculated at being about 9500 Kelvin. (Based on the b-v value of 0 and the lookup on SDSS.)

13 Andromedae Radius has been calculated as being 2.21 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,534,373.32. km.

Variable Type of 13 Andromedae

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).

Source of Information

The source of the information came 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.

13 Andromedae Facts


Traditional Name13 Andromedae
Short NameV388 And
Alternative Name(s)13 Andromedae
Hipparcos Library I.D.115755
Henry Draper Designation220885
Celestial TypeStar
Absolute Magnitude0.97
Apparent Magnitude5.75
Right Ascension (R.A.)23h 27m 07.33
Declination (Dec.)+42 d 54`43.1
Distance from the Sun / Earth294.11 Light Years
Spectral TypeB9III
Colour (B) blue
Star Type (III) giant.
Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days1.000
Variable Magnitude Range (Brighter - Dimmer)6.000 - 6.000
Radius (x the Sun)2.21
Calculated Temperature Range10,000.00 - 30,000.00


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