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Kappa1 Ceti, 96 Ceti, HD20630, HIP15457

Kappa1 Ceti is a white to yellow main sequence dwarf star that can be located in the constellation of Cetus. Kappa1 Ceti 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.

Kappa1 Ceti is the Bayer Classification for the star. HIP15457 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD20630. The Id of the star in the Gould Star Catalogue is 319. 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. The Gliese ID of the star is Gliese GL137. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names.

Kappa1 Ceti has alternative name(s), kap01 Cet.

Location of Kappa1 Ceti

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 Kappa1 Ceti, the location is 03h 19m 21.54 and +03d22`11.9 .

Proper Motion of Kappa1 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 93.75 ± 0.15 miliarcseconds/year towards the north and 269.30 ± 0.27 miliarcseconds/year east if we saw them in the horizon.

Kappa1 Ceti 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 1.0000000 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 Kappa1 Ceti

Kappa1 Ceti has a spectral type of G5Vvar. This means the star is a white to yellow main sequence dwarf star. The star is 7407.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24158.9188900800000000s. The star has a B-V Colour Index of 0.68 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,625 Kelvin.

Kappa1 Ceti Radius has been calculated as being 0.97 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 674,673.10.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.97. 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 0.05 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Kappa1 Ceti Apparent and Absolute Magnitudes

Kappa1 Ceti has an apparent magnitude of 4.84 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 5.03 If you used the 2007 Parallax value, you would get an absolute magnitude of 5.04. 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 Kappa1 Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 109.18 which gave the calculated distance to Kappa1 Ceti as 29.87 light years away from Earth or 9.16 parsecs. It would take a spaceship travelling at the speed of light, 29.87 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 109.41 which put Kappa1 Ceti at a distance of 29.81 light years or 9.14 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 7,407.00 Parsecs or 24,158.92 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. Kappa1 Ceti brightness ranges from a magnitude of 4.995 to a magnitude of 4.952 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 9.1 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.

Kappa1 Ceti Facts

Alternative Names

Flamsteed Name96 Ceti
Flamsteed Short Name96 Cet
Short Namekap01 Cet
Bayer DesignationKappa1 Ceti
Hipparcos Library I.D.15457
Bonner DurchmusterungBD+02 518
Gould I.D.319
Gliese ID137
Henry Draper Designation20630

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude5.03 / 5.04
Visual / Apparent Magnitude4.84
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 19m 21.54
Declination (Dec.)+03d22`11.9
Galactic Latitude-43.07 degrees
Galactic Longitude178.22 degrees
1997 Distance from Earth109.18 Parallax (milliarcseconds)
 29.87 Light Years
 9.16 Parsecs
2007 Revised Distance from Earth109.41 Parallax (milliarcseconds)
 29.81 Light Years
 9.14 Parsecs
Galacto-Centric Distance24,158.92 Light Years / 7,407.00 Parsecs
Proper Motion Dec.93.75 ± 0.15 milliarcseconds/year
Proper Motion RA.269.30 ± 0.27 milliarcseconds/year
B-V Index0.68
Radial Velocity18.80 ± 0.09 km/s
Iron Abundance0.05 ± 9.99 Fe/H
Spectral TypeG5Vvar
Colour(G) White to Yellow

Variable Star Details

Mean Variability Period in Days9.095
Variable Magnitude Range (Brighter - Dimmer)4.952 - 4.995

Estimated Facts

Luminosity (x the Sun)1.0000000
Calculated Effective Temperature5,625 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
20630+02 518.0A5.00000267.0000098.00000G5Yellow
+02 521.0B9.60000-16.0000028.000001909
BC11.900001909

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