Universe Guide


12 Andromedae - HD220117 - HIP115280

12 Andromedae is a blue to white main sequence dwarf star that can be located in the constellation of Andromeda. HIP115280 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD220117. 12 Andromedae has alternative name(s), 12 Andromedae , 12 And.

Location of 12 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 12 Andromedae, the location is 23h 20m 53.17 and +38d10`56.9 .

Proper Motion of 12 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 -061.14 ± 000.22 towards the north and 129.01 ± 000.34 east if we saw them in the horizon.

12 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 3.0000000 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 12 Andromedae

12 Andromedae has a spectral type of F5V. This means the star is a blue to white coloured main sequence dwarf star. The star has a B-V Colour Index of 0.46 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,456 Kelvin.

12 Andromedae has been calculated as 2.22 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,546,802.86.km.

12 Andromedae Apparent and Absolute Magnitudes

12 Andromedae has an apparent magnitude of 5.77 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 2.63 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.66. 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 12 Andromedae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 23.59 which gave the calculated distance to 12 Andromedae as 138.26 light years away from Earth or 42.39 parsecs. In 2007, Hipparcos data was revised with a new parallax of 23.83 which put 12 Andromedae at a distance of 136.87 light years or 41.96 parsecs.

It would take a spaceship travelling at the speed of light, 138.26 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.

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12 Andromedae Facts

Alternative Names

Traditional Name12 Andromedae
Short Name12 And
Alternative Name(s)12 Andromedae
Hipparcos Library I.D.115280
Bonner DurchmusterungBD+37 4817
Henry Draper Designation220117

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude2.63 / 2.66
Apparent Magnitude5.77
Right Ascension (R.A.)23h 20m 53.17
Declination (Dec.)+38d10`56.9
1997 Distance from Earth23.59 Parallax (milliarcseconds)
 138.26 Light Years
 42.39 Parsecs
2007 Distance from Earth23.83 Parallax (milliarcseconds)
 136.87 Light Years
 41.96 Parsecs
Proper Motion Dec.-61.14 ± 0.22 milliarcseconds/year
Proper Motion RA.129.01 ± 0.34 milliarcseconds/year
B-V Index0.46
Spectral TypeF5V
Colour(F) blue to white

Estimated Facts

Radius (x the Sun)2.22
Luminosity (x the Sun)3.0000000
Calculated Effective Temperature6,456 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
220117+37 4817.0A5.80000129.00000-60.00000F5Yellow/White
+37 4816.0B9.2000032.00000-22.000001918

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