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CM Lacertae, HD209147, HIP108606

CM 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.

CM Lacertae's Alternative Names

HIP108606 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD209147.

CM Lacertae has alternative name(s) :- , CM 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+43 4106.

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

Location of CM 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 CM Lacertae, the location is 22h 00m 04.44 and +44° 33` 07.7 .

Proper Motion of CM Lacertae

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 3.60 ± 0.51 miliarcseconds/year towards the north and 16.92 ± 0.69 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -16.10000 km/s with an error of about 4.50 km/s .

CM Lacertae Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 21.25 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of CM Lacertae

CM Lacertae has a spectral type of A2V. This means the star is a blue main sequence dwarf star. The star is 7,417.00 Parsecs from the Galactic Centre or terms of Light Years is 24,191.54 s. The star has a B-V Colour Index of 0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,827 Kelvin.

CM Lacertae Radius has been calculated as being 2.64 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,837,313.31.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.

CM Lacertae Apparent and Absolute Magnitudes

CM Lacertae has an apparent magnitude of 8.20 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 1.42 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 CM Lacertae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.40 which gave the calculated distance to CM Lacertae as 741.28 light years away from Earth or 227.27 parsecs. It would take a spaceship travelling at the speed of light, 741.28 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star's Galacto-Centric Distance is 7,417.00 Parsecs or 24,191.54 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of CM 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. CM Lacertae brightness ranges from a magnitude of 8.800 to a magnitude of 8.220 over its variable period. The smaller the magnitude, the brighter the star.

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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CM Lacertae Facts

Visual Facts


Primary / Proper / Traditional NameCM Lacertae
Alternative NamesHD 209147, HIP 108606, BD+43 4106, CM Lac
Spectral TypeA2V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationLacerta
Absolute Magnitude1.42
Visual / Apparent Magnitude8.20
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)22h 00m 04.44
Declination (Dec.)+44° 33` 07.7
Galactic Latitude-8.35 degrees
Galactic Longitude93.61 degrees
Distance from Earth4.40 Parallax (milliarcseconds)
 741.28 Light Years
 227.27 Parsecs
Galacto-Centric Distance24,191.54 Light Years / 7,417.00 Parsecs
Proper Motion Dec.3.60 ± 0.51 milliarcseconds/year
Proper Motion RA.16.92 ± 0.69 milliarcseconds/year
B-V Index0.19
Radial Velocity-16.10 ± 4.50 km/s
Eccentricity0.05
Semi-Major Axis7188.00
Stellar Luminosity (Lsun)21.25

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/Detached Main Sequence (subtype)
Variable Magnitude Range (Brighter - Dimmer)8.220 - 8.800

Estimated Facts


Calculated Effective Temperature7,827 Kelvin

Sources and Links


SIMBAD SourceLink

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