Universe Guide

HomeFactsConstellationsCetus

79 Ceti - HD16141 - HIP12048

79 Ceti is a white to yellow subgiant star that can be located in the constellation of Cetus. The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 9.40 Billion of Years but could be as young as 8.60 to 10.20 according to Hipparcos.

HIP12048 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD16141. The Id of the star in the Gould Star Catalogue is 267. 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.

79 Ceti has alternative name(s), 79 Ceti , 79 Cet. 79 Ceti has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of 79 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 79 Ceti, the location is 02h 35m 20.02 and -03d33`34.3 .

Proper Motion of 79 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 -438.79 ± 0.38 miliarcseconds/year towards the north and -157.31 ± 0.66 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Metallicity, Age, Mass, Radius) of 79 Ceti

79 Ceti has a spectral type of G5IV. This means the star is a white to yellow subgiant star. The star is 7422.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24207.8433916800000000s. The star has a B-V Colour Index of 0.67 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,656 Kelvin.

79 Ceti Radius has been calculated as being 1.51 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,047,922.75.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.63. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 1.00 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.020000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The stars age according to Hipparcos data files put the star at an age of about 9.40 Billion years old but could be between 8.60 and 10.20 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

79 Ceti Apparent and Absolute Magnitudes

79 Ceti has an apparent magnitude of 6.83 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 4.05 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.88. 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 79 Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 27.85 which gave the calculated distance to 79 Ceti as 117.11 light years away from Earth or 35.91 parsecs. It would take a spaceship travelling at the speed of light, 117.11 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 25.67 which put 79 Ceti at a distance of 127.06 light years or 38.96 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 7,422.00 Parsecs or 24,207.84 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.

79 Ceti Facts

Alternative Names

Traditional/Proper Name79 Ceti
Short Name79 Cet
Alternative Name(s)79 Ceti
Hipparcos Library I.D.12048
Bonner DurchmusterungBDD-04 426
Gould I.D.267
Henry Draper Designation16141

Visual Facts

Star Typesubgiant star
Age9.40 Billion Years Old
Age Range8.60 - 10.20 Billion Years Old
Metalicity0.0200
Absolute Magnitude4.05 / 3.88
Visual / Apparent Magnitude6.83
Naked Eye VisibleRequires a 7x50 Binoculars - Ref: Wiki
Right Ascension (R.A.)02h 35m 20.02
Declination (Dec.)-03d33`34.3
Galactic Latitude-55.78 degrees
Galactic Longitude173.94 degrees
1997 Distance from Earth27.85 Parallax (milliarcseconds)
 117.11 Light Years
 35.91 Parsecs
2007 Revised Distance from Earth25.67 Parallax (milliarcseconds)
 127.06 Light Years
 38.96 Parsecs
Galacto-Centric Distance24,207.84 Light Years / 7,422.00 Parsecs
Proper Motion Dec.-438.79 ± 0.38 milliarcseconds/year
Proper Motion RA.-157.31 ± 0.66 milliarcseconds/year
B-V Index0.67
Radial Velocity-50.93 ± 0.09 km/s
Iron Abundance0.10 ± 0.01 Fe/H
Spectral TypeG5IV
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature5,656 Kelvin
Mass Compared to the Sun1.00
Metallicity0.02000

Sources and Links

SIMBAD SourceLink

Related Stars


List of Extrasolar Planets orbiting 79 Ceti


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Hd 16141 BConfirmed0.21575.8200.2820000.3541.000

Add a Comment


Name:
Email: (Optional)
Comment: