Universe Guide

10 Andromedae - HD219981 - HIP115191

10 Andromedae is a red giant star that can be located in the constellation of Andromeda. HIP115191 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD219981. 10 Andromedae has alternative name(s), 10 Andromedae , 10 And.

Location of 10 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 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 10 Andromedae, the location is 23h 19m 52.38 and +42d04`40.9 .

Proper Motion of 10 Andromedae

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 004.18 ± 000.28 towards the north and 047.38 ± 000.41 east if we saw them in the horizon.

10 Andromedae Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 15.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of 10 Andromedae

10 Andromedae has a spectral type of M0III. This means the star is a red coloured giant star. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,971 Kelvin.

10 Andromedae has been calculated as 26.67 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 18,553,618.33.km.

10 Andromedae Apparent and Absolute Magnitudes

10 Andromedae has an apparent magnitude of 5.81 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 -0.30 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.03. 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 10 Andromedae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.01 which gave the calculated distance to 10 Andromedae as 542.70 light years away from Earth or 166.39 parsecs. In 2007, Hipparcos data was revised with a new parallax of 6.78 which put 10 Andromedae at a distance of 481.07 light years or 147.49 parsecs.

It would take a spaceship travelling at the speed of light, 542.70 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.

10 Andromedae Facts


Traditional Name10 Andromedae
Short Name10 And
Alternative Name(s)10 Andromedae
Hipparcos Library I.D.115191
Bonner DurchmusterungBD+41 4752
Henry Draper Designation219981
Celestial TypeStar
Absolute Magnitude-0.30 / -0.03
Apparent Magnitude5.81
Right Ascension (R.A.)23h 19m 52.38
Declination (Dec.)+42d04`40.9
1997 Distance from Earth6.01 Parallax (milliarcseconds)
 542.70 Light Years
 166.39 Parsecs
2007 Distance from Earth6.78 Parallax (milliarcseconds)
 481.07 Light Years
 147.49 Parsecs
Proper Motion Dec.4.18 ± 0.28 milliarcseconds/year
Proper Motion RA.47.38 ± 0.41 milliarcseconds/year
B-V Index1.51
Spectral TypeM0III
Colour(M) Red
Star Typegiant star
Radius (x the Sun)26.67
Luminosity (x the Sun)15.0000000
Calculated Effective Temperature3,971 Kelvin


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