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CG Ceti

CG Ceti Facts

  • CG Ceti is a pulsating giant star that can be located in the constellation of Cetus. The description is based on the spectral class.
  • CG Ceti is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2III) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 829.93 light years away from us. Distance

CG Ceti's Alternative Names

HIP720 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD437.

CG Ceti has alternative name(s) :- , CG Cet.

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-22 7.

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

Location of CG Ceti

The location of the giant 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 CG Ceti, the location is 00h 08m 53.66 and -22° 10` 46.2 .

Radial Velocity and Proper Motion of CG Ceti

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 -5.89 ± 0.30 milliarcseconds/year towards the north and -17.95 ± 0.61 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 -0.50000 km/s with an error of about 0.80 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 of CG Ceti

CG Ceti Temperature and Colour

Based on the star's spectral type of M2III , CG Ceti's colour and type is red giant star. The star has a B-V Colour Index of 1.6 which means the star's temperature is about 3,779 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

CG Ceti Radius

CG Ceti estimated radius has been calculated as being 25.83 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 17,973,707.88.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 20.804085991687128952032318370. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

CG Ceti Apparent and Absolute Magnitudes

CG Ceti has an apparent magnitude of 7.13 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 -0.37 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.10. 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 CG Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.16000 which gave the calculated distance to CG Ceti as 1032.16 light years away from Earth or 316.46 parsecs. If you want that in miles, it is about 6,067,681,965,185,194.90, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 3.93000 which put CG Ceti at a distance of 829.93 light years or 254.45 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 52,483,714.24 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. The star's Galacto-Centric Distance is 7,379.00 Parsecs or 24,067.59 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to CG Ceti

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4139,141,214,726.49
Car1204,638,040,490.88
Airbus A380736756,202,253.95
Speed of Sound (Mach 1)767.269725,384,264.07
Concorde (Mach 2)1,534.54362,691,659.33
New Horizons Probe33,00016,865,601.79
Speed of Light670,616,629.00829.93

Variable Type of CG Ceti

The star is a pulsating Semi-Regular Star w 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. CG Ceti brightness ranges from a magnitude of 7.234 to a magnitude of 7.125 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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Additional CG Ceti Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCG Ceti
Alternative NamesHD 437, HIP 720, BD-22 7, CG Cet
Spectral TypeM2III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationCetus
Absolute Magnitude -0.37 / 0.10
Visual / Apparent Magnitude7.13
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)00h 08m 53.66
Declination (Dec.)-22° 10` 46.2
Galactic Latitude-79.14700321 degrees
Galactic Longitude57.74258725 degrees
1997 Distance from Earth3.16000 Parallax (milliarcseconds)
 1032.16 Light Years
 316.46 Parsecs
2007 Distance from Earth3.93000 Parallax (milliarcseconds)
 829.93 Light Years
 254.45 Parsecs
 52,483,714.24 Astronomical Units
Galacto-Centric Distance24,067.59 Light Years / 7,379.00 Parsecs
Proper Motion Dec.-5.89000 ± 0.30000 milliarcseconds/year
Proper Motion RA.-17.95000 ± 0.61000 milliarcseconds/year
B-V Index1.6
Radial Velocity-0.50000 ± 0.80 km/s
Eccentricity0.24810
Semi-Major Axis8966.0000000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.081
Variable Magnitude Range (Brighter - Dimmer)7.125 - 7.234

Estimated Calculated Facts


Radius (x the Sun)20.80
Effective Temperature3,779 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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