Universe Guide

13 Cephei - HD208501 - HIP108165

13 Cephei is a blue eruptive less luminour supergiant star that can be located in the constellation of Cepheus. 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.

Location of 13 Cephei

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 Cephei, the location is 21h 54m 53.16 and +56 d 36 ` 40.4 .

Physical Properties/View of 13 Cephei

13 Cephei has a spectral type of B8Ibvar. This means the star is (B) blue coloured (Ib) less luminous supergiant. 13 Cephei lies at a distance of 2,528.40 light years away from our Sun and our planet Earth or to put it another way, 775.07 parsecs away from the Sun.

13 Cephei has an apparent magnitude of 5.74 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 13 Cephei has an absolute magnitude of -3.71 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 13 Cephei

The star is a eruptive 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 Cephei brightness ranges from a magnitude of 6.000 to a magnitude of 6.000 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 Cephei Facts


Traditional Name13 Cephei
Short NameNSV 13963
Hipparcos Library I.D.108165
Henry Draper Designation208501
Celestial TypeStar
Absolute Magnitude-3.71
Apparent Magnitude5.74
Right Ascension (R.A.)21h 54m 53.16
Declination (Dec.)+56 d 36 ` 40.4
Distance from the Sun / Earth2,528.40 Light Years
Spectral TypeB8Ibvar
Colour (B) blue
Star Type (Ib) less luminous supergiant.
Variable Star ClassEruptive
Variable Star TypeIrregular
Variable Magnitude Range (Brighter - Dimmer)6.000 - 6.000
Calculated Temperature Range10,000.00 - 30,000.00


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