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213 G. Ceti, HD13215, HIP9999

213 G. Ceti is a red pulsating giant star that can be located in the constellation of Cetus. 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.

213 G. Ceti's Alternative Names

HIP9999 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD13215.

213 G. Ceti has alternative name(s) :- , NSV 00732.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 213 G. Ceti. There are no stars with a Gould designation in Ursa Major for example.

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-18 374.

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

Location of 213 G. Ceti

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 213 G. Ceti, the location is 02h 08m 45.67 and -17° 46` 44.8 .

Proper Motion of 213 G. Ceti

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 -20.83 ± 0.32 miliarcseconds/year towards the north and -10.82 ± 0.57 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 16.10000 km/s with an error of about 0.60 km/s .

Physical Properties (Colour, Temperature) of 213 G. Ceti

213 G. Ceti has a spectral type of M1III. This means the star is a red giant star. The star is 7,498.00 Parsecs from the Galactic Centre or terms of Light Years is 24,455.73 s. The star has a B-V Colour Index of 1.66 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,608 Kelvin.

213 G. Ceti Radius has been calculated as being 58.13 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 40,445,827.04.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 41.34. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

213 G. Ceti Apparent and Absolute Magnitudes

213 G. Ceti has an apparent magnitude of 6.07 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 -1.93 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.19. 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 213 G. Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.51 which gave the calculated distance to 213 G. Ceti as 1299.46 light years away from Earth or 398.41 parsecs. It would take a spaceship travelling at the speed of light, 1299.46 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 3.53 which put 213 G. Ceti at a distance of 923.98 light years or 283.29 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 7,498.00 Parsecs or 24,455.73 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of 213 G. Ceti

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. 213 G. Ceti brightness ranges from a magnitude of 6.172 to a magnitude of 6.093 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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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213 G. Ceti Facts

Visual Facts


Primary / Proper / Traditional Name213 G. Ceti
Alternative NamesHD 13215, HIP 9999, BD-18 374, NSV 00732
Spectral TypeM1III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
ConstellationCetus
Absolute Magnitude-1.93 / -1.19
Visual / Apparent Magnitude6.07
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)02h 08m 45.67
Declination (Dec.)-17° 46` 44.8
Galactic Latitude-69.87 degrees
Galactic Longitude189.29 degrees
1997 Distance from Earth2.51 Parallax (milliarcseconds)
 1299.46 Light Years
 398.41 Parsecs
2007 Distance from Earth3.53 Parallax (milliarcseconds)
 923.98 Light Years
 283.29 Parsecs
Galacto-Centric Distance24,455.73 Light Years / 7,498.00 Parsecs
Proper Motion Dec.-20.83 ± 0.32 milliarcseconds/year
Proper Motion RA.-10.82 ± 0.57 milliarcseconds/year
B-V Index1.66
Radial Velocity16.10 ± 0.60 km/s
Eccentricity0.18
Semi-Major Axis7925.00

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.068
Variable Magnitude Range (Brighter - Dimmer)6.093 - 6.172

Estimated Facts


Calculated Effective Temperature3,608 Kelvin

Sources and Links


SIMBAD SourceLink

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