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BL Ceti

BL Ceti Facts

  • BL Ceti is a main sequence 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. Distance

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 objects' alternative names can be found at Star Names .

Location of BL Ceti

The location of the main sequence 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 object 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 milliarcseconds/year towards the north and 3,296.00 milliarcseconds/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 of BL Ceti

BL Ceti Colour and Temperature

Based on the star's spectral type of M5.5V , BL Ceti's colour and type is red main sequence star. The star has a B-V Colour Index of 1.87 which means the star's temperature is about 2,415 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

BL Ceti Radius

BL Ceti estimated 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 rather than peer reviewed papers. It has been known to produce widely incorrect figures.

BL Ceti Mass

The BL Ceti's solar mass is 0.10 times that of our star, the Sun. 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 373.70000 which gives a calculated distance to BL Ceti of 8.73 light years from the Earth or 2.68 parsecs. It is about 51,320,399,507,893 miles from Earth.

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.

Travel Time to BL Ceti

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking41,463,620,792.79
Car12048,787,359.76
Airbus A3807367,954,460.83
Speed of Sound (Mach 1)767.2697,630,287.65
Concorde (Mach 2)1,534.543,815,138.85
New Horizons Probe33,000177,408.58
Speed of Light670,616,629.008.73

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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
ColourRed
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 Earth373.70000 Parallax (milliarcseconds)
 8.73 Light Years
 2.68 Parsecs
 552,785.83 Astronomical Units
Proper Motion Dec.563.00000 milliarcseconds/year
Proper Motion RA.3296.00000 milliarcseconds/year
B-V Index1.87
Eccentricity0.62000
Inclination127.30000
Associated / Clustered StarsUV Ceti

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)0.04
Calculated Temperature Range2,400.00 - 3,700.00
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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