Universe Guide

12 Lacertae - HD214993 - HIP112031

12 Lacertae is a blue pulsating giant star that can be located in the constellation of Lacerta. 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. 12 Lacertae has alternative name(s), 12 Lacertae.

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 .

Physical Properties/View of 12 Lacertae

12 Lacertae has a spectral type of B2IIIv SB. This means the star is (B) blue coloured (III) giant. 12 Lacertae lies at a distance of 1,393.86 light years away from our Sun and our planet Earth or to put it another way, 427.09 parsecs away from the Sun.

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. 12 Lacertae has an absolute magnitude of -2.90 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 stars temperature has been calculated at between 10000 and 30000 based on the Class Type and lookup at Wikipedia-Stellar Classification

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 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.

12 Lacertae Facts

Traditional Name12 Lacertae
Short NameDD Lac
Alternative Name(s)12 Lacertae
Hipparcos Library I.D.112031
Henry Draper Designation214993
Celestial TypeStar
Absolute Magnitude-2.90
Apparent Magnitude5.25
Right Ascension (R.A.)22h 41m 28.65
Declination (Dec.)+40 d 13 ` 31.7
Distance from the Sun / Earth1,393.86 Light Years
Spectral TypeB2IIIv SB
Colour (B) blue
Star Type (III) giant.
Variable Star ClassPulsating
Variable Star TypeBeta Cephei
Variable Magnitude Range (Brighter - Dimmer)5.000 - 5.000
Calculated Temperature Range10,000.00 - 30,000.00

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