Universe Guide

13 Bootis - HD123782 - HIP69068

13 Bootis is a red pulsating giant star that can be located in the constellation of Bootes. 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 Bootis has alternative name(s), 13 Bootis.

Location of 13 Bootis

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 Bootis, the location is 14h 08m 17.36 and +49 d 27 ` 28.9 .

Physical Properties/View of 13 Bootis

13 Bootis has a spectral type of M2III. This means the star is (M) red coloured (III) giant. 13 Bootis lies at a distance of 556.59 light years away from our Sun and our planet Earth or to put it another way, 170.47 parsecs away from the Sun.

13 Bootis has an apparent magnitude of 5.26 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 13 Bootis has an absolute magnitude of -0.90 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 2400 and 3700 based on the Class Type and lookup at Wikipedia-Stellar Classification

Variable Type of 13 Bootis

The star is a pulsating Slow Irregular 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 Bootis 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.

13 Bootis Facts


Traditional Name13 Bootis
Short NameCF Boo
Alternative Name(s)13 Bootis
Hipparcos Library I.D.69068
Henry Draper Designation123782
Celestial TypeStar
Absolute Magnitude-0.90
Apparent Magnitude5.26
Right Ascension (R.A.)14h 08m 17.36
Declination (Dec.)+49 d 27 ` 28.9
Distance from the Sun / Earth556.59 Light Years
Spectral TypeM2III
Colour (M) red
Star Type (III) giant.
Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Variable Magnitude Range (Brighter - Dimmer)5.000 - 5.000
Calculated Temperature Range2,400.00 - 3,700.00


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