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CO Lacertae, HD240058, HIP112436

CO Lacertae is a blue eclipsing main sequence dwarf star that can be located in the constellation of Lacerta. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

CO Lacertae's Alternative Names

HIP112436 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD240058.

CO Lacertae has alternative name(s) :- , CO Lac.

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+56 2857.

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

Location of CO Lacertae

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 CO Lacertae, the location is 22h 46m 30.00 and +56° 49` 31.6 .

Physical Properties (Colour, Temperature) of CO Lacertae

CO Lacertae has a spectral type of B9V. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of 0.06 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,815 Kelvin.

CO Lacertae Apparent and Absolute Magnitudes

CO Lacertae has an apparent magnitude of 10.40 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 CO Lacertae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.61 which gave the calculated distance to CO Lacertae as -5346.94 light years away from Earth or -1639.34 parsecs. It would take a spaceship travelling at the speed of light, -5346.94 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of CO Lacertae

The star is a eclipsing Beta Persei (Algol)/Detached Main Sequence (subtype) 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. CO Lacertae brightness ranges from a magnitude of 11.020 to a magnitude of 10.413 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.5 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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CO Lacertae Facts

Visual Facts


Primary / Proper / Traditional NameCO Lacertae
Alternative NamesHD 240058, HIP 112436, BD+56 2857, CO Lac
Spectral TypeB9V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationLacerta
Visual / Apparent Magnitude10.40
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)22h 46m 30.00
Declination (Dec.)+56° 49` 31.6
Galactic Latitude-1.99 degrees
Galactic Longitude106.44 degrees
Distance from Earth-0.61 Parallax (milliarcseconds)
 -5346.94 Light Years
 -1639.34 Parsecs
B-V Index0.06
Radial Velocity-32.50 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/Detached Main Sequence (subtype)
Mean Variability Period in Days1.542
Variable Magnitude Range (Brighter - Dimmer)10.413 - 11.020

Estimated Facts


Calculated Effective Temperature8,815 Kelvin

Sources and Links


SIMBAD SourceLink

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