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BL Ceti

Primary Facts on BL Ceti

  • BL Ceti's star type is main sequence dwarf star that can be located in the constellation of Cetus. The description is based on the spectral class.
  • BL Ceti is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M5.5V) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 8.73 light years away from us.

BL Ceti's Alternative Names

The Gliese ID of the star is GL 65. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

BL Ceti has alternative name(s) :- GJ 65, Gliese 65.

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

Location of BL 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 BL Ceti, the location is 01h 39m 01.45 and -17° 57` 02.0 .

Proper Motion of BL 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 563.00 miliarcseconds/year towards the north and 3,296.00 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, Mass) of BL Ceti

BL Ceti has a spectral type of M5.5V. This means the star is a red main sequence dwarf star. The star has a B-V Colour Index of 1.87 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 2,415 Kelvin.

BL Ceti Radius has been calculated as being 0.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 28,668.22.km. If you need the diameter of the star, you just need to multiple the radius by 2. 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 0.10 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.

BL Ceti Apparent and Absolute Magnitudes

BL Ceti has an apparent magnitude of 12.70 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 15.56 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 BL Ceti

The Parallax of the star is given as 373.70 which gives a calculated distance to BL Ceti of 8.73 light years from the Earth or 2.68 parsecs. It would take a spaceship travelling at the speed of light, 8.73 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 552,785.83 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.

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Additional BL Ceti Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBL Ceti
Alternative NamesGJ 65, Gliese 65, Gliese 65
Spectral TypeM5.5V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour red
GalaxyMilky Way
ConstellationCetus
Visual / Apparent Magnitude12.70
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)01h 39m 01.45
Declination (Dec.)-17° 57` 02.0
Distance from Earth373.70 Parallax (milliarcseconds)
 8.73 Light Years
 2.68 Parsecs
 552,785.83 Astronomical Units
Proper Motion Dec.563.00 milliarcseconds/year
Proper Motion RA.3296.00 milliarcseconds/year
B-V Index1.87
Eccentricity0.62
Inclination127.30
Associated / Clustered StarsUV Ceti

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Mass Compared to the Sun0.10

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=UV+CETI / https://en.wikipedia.org/wiki/Luyten_726-8

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