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Phi2 Ceti, 19 Ceti, HD4813, HIP3909, HR235

Phi2 Ceti is a blue to white star that can be located in the constellation of Cetus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Phi2 Ceti is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR235. HIP3909 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD4813. The Id of the star in the Gould Star Catalogue is 84. 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 GL 37. 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.

Location of Phi2 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 Phi2 Ceti, the location is 00h 50m 07.72 and -10d 38` 37.6 .

Proper Motion of Phi2 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 -229.75 ± 0.23 miliarcseconds/year towards the north and -226.91 ± 0.35 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 8.22000 km/s with an error of about 0.09 km/s .

Physical Properties (Colour, Temperature, Radius) of Phi2 Ceti

Phi2 Ceti has a spectral type of F7IV-V. This means the star is a blue to white star. The star is 7402.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24142.6107228800000000s. The star has a B-V Colour Index of 0.5 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,285 Kelvin.

Phi2 Ceti Radius has been calculated as being 1.13 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 784,758.15.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.15. 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 -0.10 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Phi2 Ceti Apparent and Absolute Magnitudes

Phi2 Ceti has an apparent magnitude of 5.17 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 4.22 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.18. 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 Phi2 Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 64.69 which gave the calculated distance to Phi2 Ceti as 50.42 light years away from Earth or 15.46 parsecs. It would take a spaceship travelling at the speed of light, 50.42 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 63.48 which put Phi2 Ceti at a distance of 51.38 light years or 15.75 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 7,402.00 Parsecs or 24,142.61 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.

Phi2 Ceti Facts

Alternative Names

Flamsteed Name19 Ceti
Flamsteed Short Name19 Cet
Bayer DesignationPhi2 Ceti
Hipparcos Library I.D.3909
Yale Bright Star Catalogue (HR) Id235
Bonner DurchmusterungBD-11 153
Gould I.D.84
Gliese IDGL 37
Henry Draper Designation4813

Visual Facts

Star Type star
Absolute Magnitude4.22 / 4.18
Visual / Apparent Magnitude5.17
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)00h 50m 07.72
Declination (Dec.)-10d 38` 37.6
Galactic Latitude-73.51 degrees
Galactic Longitude121.80 degrees
1997 Distance from Earth64.69 Parallax (milliarcseconds)
 50.42 Light Years
 15.46 Parsecs
2007 Revised Distance from Earth63.48 Parallax (milliarcseconds)
 51.38 Light Years
 15.75 Parsecs
Galacto-Centric Distance24,142.61 Light Years / 7,402.00 Parsecs
Proper Motion Dec.-229.75 ± 0.23 milliarcseconds/year
Proper Motion RA.-226.91 ± 0.35 milliarcseconds/year
B-V Index0.50
Radial Velocity8.22 ± 0.09 km/s
Iron Abundance-0.10 ± 9.99 Fe/H
Spectral TypeF7IV-V
Associated / Clustered StarsPhi1 Ceti
Phi3 Ceti
Phi4 Ceti
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature6,285 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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