Universe Guide

12 Lacertae - HD214993 - HIP112031

12 Lacertae is a blue pulsating giant star that can be located in the constellation of Lacerta. HIP112031 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD214993. 12 Lacertae has alternative name(s), 12 Lacertae , DD_Lac, 12 Lac.

Location of 12 Lacertae

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 12 Lacertae, the location is 22h 41m 28.65 and +40 d 13 ` 31.7 .

Proper Motion of 12 Lacertae

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 -005.00 ± 000.00 towards the north and -002.00 ± 000.00 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 12 Lacertae

12 Lacertae has a spectral type of B2IIIv SB. This means the star is a blue coloured giant star. The star has a B-V Colour Index of -0.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,762 Kelvin.

12 Lacertae has been calculated as 8.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,909,927.57.km.

12 Lacertae Apparent and Absolute Magnitudes

12 Lacertae has an apparent magnitude of 5.25 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 -3.24 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.24. 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 Lacertae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.00 which gave the calculated distance to 12 Lacertae as 1630.82 light years away from us or 500 parsecs. In 2007, Hipparcos data was revised with a new parallax of 2.00 which put 12 Lacertae at a distance of 1630.82 light years or 500 parsecs.

Variable Type of 12 Lacertae

The star is a pulsating Beta Cephei 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. 12 Lacertae brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star.

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.

12 Lacertae Facts


Traditional Name12 Lacertae
Short NameDD Lac, 12 Lac
Alternative Name(s)12 Lacertae
Hipparcos Library I.D.112031
Henry Draper Designation214993
Celestial TypeStar
Absolute Magnitude-3.24 / -3.24
Apparent Magnitude5.25
Right Ascension (R.A.)22h 41m 28.65
Declination (Dec.)+40 d 13 ` 31.7
1997 Distance2.00 Parallax (milliarcseconds)
 1630.82 Light Years
 500 Parsecs
2007 Distance2.00 Parallax (milliarcseconds)
 1630.82 Light Years
 500 Parsecs
Proper Motion Dec.-5.00 ± 0.00 milliarcseconds/year
Proper Motion RA.-2.00 ± 0.00 milliarcseconds/year
B-V Index-0.13
Spectral TypeB2IIIv SB
Colour(B) blue
Star Typegiant star
Variable Star ClassPulsating
Variable Star TypeBeta Cephei
Radius (x the Sun)8.49
Calculated Effective Temperature12,762 Kelvin


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