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Lambda Cephei, 22 Cephei, HD210839, HIP109556, HR8469

Lambda Cephei is a blue star that can be located in the constellation of Cepheus. Lambda Cephei is the brightest star in Cepheus based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Lambda Cephei is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR8469. HIP109556 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD210839.

Lambda Cephei has alternative name(s), NSV 14069.

Location of Lambda 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 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 Lambda Cephei, the location is 22h 11m 30.58 and +59d 24` 52.3 .

Proper Motion of Lambda 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 -11.09 ± 0.16 miliarcseconds/year towards the north and -7.46 ± 0.22 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Lambda Cephei

Lambda Cephei has a spectral type of O6e. This means the star is a blue star. The star is 7564.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24670.9953401600000000s. The star has a B-V Colour Index of 0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,480 Kelvin.

Lambda Cephei Radius has been calculated as being 27.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,125,759.98.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 32.90. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.03 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Lambda Cephei Apparent and Absolute Magnitudes

Lambda Cephei has an apparent magnitude of 5.05 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 -3.47 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.86. 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 Lambda Cephei

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.98 which gave the calculated distance to Lambda Cephei as 1647.29 light years away from Earth or 505.05 parsecs. It would take a spaceship travelling at the speed of light, 1647.29 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 1.65 which put Lambda Cephei at a distance of 1976.75 light years or 606.06 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.

The star's Galacto-Centric Distance is 7,564.00 Parsecs or 24,671.00 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. Lambda Cephei brightness ranges from a magnitude of 5.148 to a magnitude of 5.111 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.

Lambda Cephei Facts

Alternative Names

Flamsteed Name22 Cephei
Flamsteed Short Name22 Cep
Short NameNSV 14069
Bayer DesignationLambda Cephei
Hipparcos Library I.D.109556
Yale Bright Star Catalogue (HR) Id8469
Bonner DurchmusterungBD+58 2402
Henry Draper Designation210839

Visual Facts

Star Type star
Absolute Magnitude-3.47 / -3.86
Visual / Apparent Magnitude5.05
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)22h 11m 30.58
Declination (Dec.)+59d 24` 52.3
Galactic Latitude2.61 degrees
Galactic Longitude103.83 degrees
1997 Distance from Earth1.98 Parallax (milliarcseconds)
 1647.29 Light Years
 505.05 Parsecs
2007 Revised Distance from Earth1.65 Parallax (milliarcseconds)
 1976.75 Light Years
 606.06 Parsecs
Galacto-Centric Distance24,671.00 Light Years / 7,564.00 Parsecs
Proper Motion Dec.-11.09 ± 0.16 milliarcseconds/year
Proper Motion RA.-7.46 ± 0.22 milliarcseconds/year
B-V Index0.19
Radial Velocity-75.10 ± 0.90 km/s
Iron Abundance0.03 ± 9.99 Fe/H
Spectral TypeO6e
Colour(O) blue

Variable Star Details

Mean Variability Period in Days0.024
Variable Magnitude Range (Brighter - Dimmer)5.111 - 5.148

Estimated Facts

Calculated Effective Temperature7,480 Kelvin

Sources and Links

SIMBAD SourceLink

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