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Baten Kaitos, Zeta Ceti, 55 Ceti, HD11353, HIP8645, HR539

Baten Kaitos (Zeta Ceti) is a orange to red giant star that can be located in the constellation of Cetus. Baten Kaitos is the brightest star in Cetus 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.

Zeta Ceti is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR539. HIP8645 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD11353. The Id of the star in the Gould Star Catalogue is 185. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Location of Baten Kaitos

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 Baten Kaitos, the location is 01h 51m 27.61 and -10d20`05.8 .

Proper Motion of Baten Kaitos

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 -37.25 ± 0.37 miliarcseconds/year towards the north and 40.80 ± 0.57 miliarcseconds/year east if we saw them in the horizon.

Baten Kaitos Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 70.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Baten Kaitos

Baten Kaitos has a spectral type of K2III. This means the star is a orange to red giant star. The star is 7426.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24220.8899254400000000s. The star has a B-V Colour Index of 1.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,611 Kelvin.

Baten Kaitos Radius has been calculated as being 20.76 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 14,447,910.65.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 18.85. 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 -0.04 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Baten Kaitos Apparent and Absolute Magnitudes

Baten Kaitos has an apparent magnitude of 3.74 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 -0.76 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.55. 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 Baten Kaitos

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 12.59 which gave the calculated distance to Baten Kaitos as 259.07 light years away from Earth or 79.43 parsecs. It would take a spaceship travelling at the speed of light, 259.07 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 13.88 which put Baten Kaitos at a distance of 234.99 light years or 72.05 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 7,426.00 Parsecs or 24,220.89 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Baten Kaitos Facts

Alternative Names

Traditional/Proper NameBaten Kaitos
Flamsteed Name55 Ceti
Flamsteed Short Name55 Cet
Bayer DesignationZeta Ceti
Hipparcos Library I.D.8645
Yale Bright Star Catalogue (HR) Id539
Bonner DurchmusterungBD-11 359
Gould I.D.185
Henry Draper Designation11353

Visual Facts

Star Typegiant star
Absolute Magnitude-0.76 / -0.55
Visual / Apparent Magnitude3.74
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)01h 51m 27.61
Declination (Dec.)-10d20`05.8
Galactic Latitude-68.05 degrees
Galactic Longitude165.88 degrees
1997 Distance from Earth12.59 Parallax (milliarcseconds)
 259.07 Light Years
 79.43 Parsecs
2007 Revised Distance from Earth13.88 Parallax (milliarcseconds)
 234.99 Light Years
 72.05 Parsecs
Galacto-Centric Distance24,220.89 Light Years / 7,426.00 Parsecs
Proper Motion Dec.-37.25 ± 0.37 milliarcseconds/year
Proper Motion RA.40.80 ± 0.57 milliarcseconds/year
B-V Index1.13
Radial Velocity7.80 ± 0.30 km/s
Iron Abundance-0.04 ± 9.99 Fe/H
Spectral TypeK2III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)70.0000000
Calculated Effective Temperature4,611 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
11353-11 359.0A3.9000035.00000-36.00000K0Orange
11366-11 360.0B10.1000077.00000-13.00000K0Orange1907

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