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AL Ceti

AL Ceti Facts

AL Ceti's Alternative Names

HIP5368 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD6816.

AL Ceti has alternative name(s) :- , AL 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-17 198.

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

Location of AL Ceti

The location of the giant 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 AL Ceti, the location is 01h 08m 38.90 and -17° 03` 49.1 .

Physical Properties (Colour, Temperature) of AL Ceti

AL Ceti Colour and Temperature

AL Ceti has a spectral type of M3III. This means the star is a red giant star. The star has a B-V Colour Index of 1.55 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,892 Kelvin.

AL Ceti Apparent and Absolute Magnitudes

AL Ceti has an apparent magnitude of 8.76 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 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 AL Ceti

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.13 which gave the calculated distance to AL Ceti as -25089.49 light years away from Earth or -7692.31 parsecs. It would take a spaceship travelling at the speed of light, -25089.49 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of AL Ceti

The star is a pulsating Slow Irregular 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. AL Ceti brightness ranges from a magnitude of 8.828 to a magnitude of 8.638 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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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Additional AL Ceti Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAL Ceti
Alternative NamesHD 6816, HIP 5368, BD-17 198, AL Cet
Spectral TypeM3III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationCetus
Visual / Apparent Magnitude8.76
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)01h 08m 38.90
Declination (Dec.)-17° 03` 49.1
Galactic Latitude-79.18 degrees
Galactic Longitude145.39 degrees
Distance from Earth-0.13 Parallax (milliarcseconds)
 -25089.49 Light Years
 -7692.31 Parsecs
 -1,586,641,775.87 Astronomical Units
B-V Index1.55
Radial Velocity-13.00 ± 4.50 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.267
Variable Magnitude Range (Brighter - Dimmer)8.638 - 8.828

Estimated Calculated Facts


Effective Temperature3,892 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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