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26 Cephei

26 Cephei Facts

26 Cephei's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR8561. HIP110817 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD213087.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 26 Cephei with it shortened to 26 Cep.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+64 1664.

More details on objects' alternative names can be found at Star Names .

Location of 26 Cephei

The location of the supergiant star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For 26 Cephei, the location is 22h 27m 05.31 and +65° 07` 56.2 .

Radial Velocity and Proper Motion of 26 Cephei

Proper Motion

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 -2.62 ± 0.20 milliarcseconds/year towards the north and 0.10 ± 0.24 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -12.70 km/s with an error of about 1.60 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of 26 Cephei

26 Cephei Colour and Temperature

26 Cephei has a spectral type of B0.5Ib. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.3 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,790 Kelvin.

26 Cephei Radius

Radius has been calculated as being 41.23 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 28,687,114.35.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 86.94. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

26 Cephei Apparent and Absolute Magnitudes

26 Cephei has an apparent magnitude of 5.52 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 -3.93 If you used the 2007 Parallax value, you would get an absolute magnitude of -5.55. 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 26 Cephei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.29 which gave the calculated distance to 26 Cephei as 2528.40 light years away from Earth or 775.19 parsecs. It would take a spaceship travelling at the speed of light, 2528.40 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 0.61 which put 26 Cephei at a distance of 5346.94 light years or 1639.34 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Using the 2007 distance, the star is roughly 338,135,791.31 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. 26 Cephei brightness ranges from a magnitude of 5.618 to a magnitude of 5.573 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 days (variability).

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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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Additional 26 Cephei Facts and Figures

Visual Facts


Primary / Proper / Traditional Name26 Cephei
Alternative NamesHD 213087, HIP 110817, HR 8561, 26 Cep, BD+64 1664
Spectral TypeB0.5Ib
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star less luminour Supergiant Star
ColourBlue
GalaxyMilky Way
ConstellationCepheus
Absolute Magnitude -3.93 / -5.55
Visual / Apparent Magnitude5.52
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 27m 05.31
Declination (Dec.)+65° 07` 56.2
Galactic Latitude6.39 degrees
Galactic Longitude108.50 degrees
1997 Distance from Earth1.29 Parallax (milliarcseconds)
 2528.40 Light Years
 775.19 Parsecs
2007 Distance from Earth0.61 Parallax (milliarcseconds)
 5346.94 Light Years
 1639.34 Parsecs
 338,135,791.31 Astronomical Units
Proper Motion Dec.-2.62 ± 0.20 milliarcseconds/year
Proper Motion RA.0.10 ± 0.24 milliarcseconds/year
B-V Index0.30
Radial Velocity-12.70 ± 1.60 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.039
Variable Magnitude Range (Brighter - Dimmer)5.573 - 5.618

Estimated Calculated Facts


Radius (x the Sun)86.94
Effective Temperature6,790 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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