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WY Ceti, HD9808, HIP7417

WY Ceti is a blue to white eclipsing main sequence dwarf star that can be located in the constellation of Cetus. The description is based on the spectral class. WY Ceti is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

WY Ceti's Alternative Names

HIP7417 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD9808.

WY Ceti has alternative name(s) :- , WY 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-12 294.

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

Location of WY Ceti

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For WY Ceti, the location is 01h 35m 35.93 and -11° 56` 30.4 .

Proper Motion of WY 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 -28.79 ± 1.01 miliarcseconds/year towards the north and -24.05 ± 1.56 miliarcseconds/year east if we saw them in the horizon. . 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 (Colour, Temperature) of WY Ceti

WY Ceti has a spectral type of F0V. This means the star is a blue to white main sequence dwarf star. The star has a B-V Colour Index of 0.33 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,066 Kelvin.

WY Ceti Radius has been calculated as being 4.21 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,931,110.69.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 4.17. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

WY Ceti Apparent and Absolute Magnitudes

WY Ceti has an apparent magnitude of 9.17 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 0.85 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.87. 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 WY Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.17 which gave the calculated distance to WY Ceti as 1503.06 light years away from Earth or 460.83 parsecs. It would take a spaceship travelling at the speed of light, 1503.06 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 2.19 which put WY Ceti at a distance of 1489.33 light years or 456.62 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 94,183,979.55 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.

Variable Type of WY Ceti

The star is a eclipsing Beta Persei (Algol)/ 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. WY Ceti brightness ranges from a magnitude of 10.300 to a magnitude of 9.222 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.9 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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WY Ceti Facts

Visual Facts


Primary / Proper / Traditional NameWY Ceti
Alternative NamesHD 9808, HIP 7417, BD-12 294, WY Cet
Spectral TypeF0V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue to white
GalaxyMilky Way
ConstellationCetus
Absolute Magnitude 0.85 / 0.87
Visual / Apparent Magnitude9.17
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 35m 35.93
Declination (Dec.)-11° 56` 30.4
Galactic Latitude-71.62 degrees
Galactic Longitude159.38 degrees
1997 Distance from Earth2.17 Parallax (milliarcseconds)
 1503.06 Light Years
 460.83 Parsecs
2007 Distance from Earth2.19 Parallax (milliarcseconds)
 1489.33 Light Years
 456.62 Parsecs
 94,183,979.55 Astronomical Units
Proper Motion Dec.-28.79 ± 1.01 milliarcseconds/year
Proper Motion RA.-24.05 ± 1.56 milliarcseconds/year
B-V Index0.33

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/
Mean Variability Period in Days1.940
Variable Magnitude Range (Brighter - Dimmer)9.222 - 10.300

Estimated Facts


Calculated Effective Temperature7,066 Kelvin

Sources and Links


SIMBAD SourceLink

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