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Nu Cephei, 10 Cephei, HD207260, HIP107418, HR8334

Nu Cephei is a blue pulsating supergiant star that can be located in the constellation of Cepheus. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Nu Cephei's Alternative Names

Nu Cephei (Nu. Cep) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR8334. HIP107418 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD207260.

Nu Cephei has alternative name(s) :- , nu. Cep.

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 10 Cephei with it shortened to 10 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+60 2288.

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

Location of Nu Cephei

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For Nu Cephei, the location is 21h 45m 26.93 and +61° 07` 14.9 .

Proper Motion of Nu Cephei

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 -2.10 ± 0.12 miliarcseconds/year towards the north and -3.74 ± 0.14 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -25.90000 km/s with an error of about 0.40 km/s .

Physical Properties (Colour, Temperature) of Nu Cephei

Nu Cephei has a spectral type of A2Iavar. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.47 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,193 Kelvin.

Nu Cephei Radius has been calculated as being 179.13 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 124,638,336.50.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 238.33. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Nu Cephei Apparent and Absolute Magnitudes

Nu Cephei has an apparent magnitude of 4.25 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 -6.72 If you used the 2007 Parallax value, you would get an absolute magnitude of -7.34. 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 Nu Cephei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.64 which gave the calculated distance to Nu Cephei as 5096.30 light years away from Earth or 1562.5 parsecs. It would take a spaceship travelling at the speed of light, 5096.30 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 0.48 which put Nu Cephei at a distance of 6795.07 light years or 2083.33 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.

Variable Type of Nu Cephei

The star is a pulsating Alpha Cygnus 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. Nu Cephei brightness ranges from a magnitude of 4.423 to a magnitude of 4.374 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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Nu Cephei Facts

Visual Facts


Primary / Proper / Traditional NameNu Cephei
Alternative NamesNu. Cep, HD 207260, HIP 107418, HR 8334, 10 Cephei, 10 Cep, BD+60 2288, nu. Cep
Spectral TypeA2Iavar
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationCepheus
Absolute Magnitude-6.72 / -7.34
Visual / Apparent Magnitude4.25
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)21h 45m 26.93
Declination (Dec.)+61° 07` 14.9
Galactic Latitude5.93 degrees
Galactic Longitude102.31 degrees
1997 Distance from Earth0.64 Parallax (milliarcseconds)
 5096.30 Light Years
 1562.5 Parsecs
2007 Distance from Earth0.48 Parallax (milliarcseconds)
 6795.07 Light Years
 2083.33 Parsecs
Proper Motion Dec.-2.10 ± 0.12 milliarcseconds/year
Proper Motion RA.-3.74 ± 0.14 milliarcseconds/year
B-V Index0.47
Radial Velocity-25.90 ± 0.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeAlpha Cygnus
Mean Variability Period in Days0.038
Variable Magnitude Range (Brighter - Dimmer)4.374 - 4.423

Estimated Facts


Calculated Effective Temperature6,193 Kelvin

Sources and Links


SIMBAD SourceLink

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