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CM Lacertae

CM Lacertae Facts

  • CM Lacertae is a eclipsing main sequence star that can be located in the constellation of Lacerta. The description is based on the spectral class.
  • CM Lacertae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A2V) of the star, the star's colour is blue - white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 741.28 light years away from us. Distance

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, 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 objects' alternative names can be found at Star Names .

Location of CM Lacertae

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

Radial Velocity and Proper Motion of CM Lacertae

Proper Motion

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 milliarcseconds/year towards the north and 16.92 ± 0.69 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -16.10000 km/s with an error of about 4.50 km/s . 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 CM Lacertae

CM Lacertae Colour and Temperature

Based on the star's spectral type of A2V , CM Lacertae's colour and type is blue - white main sequence star. The star has a B-V Colour Index of 0.19 which means the star's temperature is about 7,827 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

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.

CM Lacertae Radius

CM Lacertae estimated 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 rather than peer reviewed papers. It 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 4.40000 which gave the calculated distance to CM Lacertae as 741.28 light years away from Earth or 227.27 parsecs. If you want that in miles, it is about 4,357,707,416,633,546.42, based on 1 Ly = 5,878,625,373,183.61 miles.

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*.

Travel Time to CM Lacertae

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)
Walking4124,278,673,686.28
Car1204,142,622,456.21
Airbus A380736675,427,574.38
Speed of Sound (Mach 1)767.269647,901,446.23
Concorde (Mach 2)1,534.54323,950,300.90
New Horizons Probe33,00015,064,081.66
Speed of Light670,616,629.00741.28

Variable Type of CM Lacertae

The star is a eclipsing Beta Persei (Algol)/ 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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Additional CM Lacertae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCM Lacertae
Alternative NamesCM Lac, HD 209147, HIP 108606, BD+43 4106, CM Lac
Spectral TypeA2V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationLacerta
Absolute Magnitude 1.42
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-8.34515499 degrees
Galactic Longitude93.60857690 degrees
Distance from Earth4.40000 Parallax (milliarcseconds)
 741.28 Light Years
 227.27 Parsecs
 46,877,475.87 Astronomical Units
Galacto-Centric Distance24,191.54 Light Years / 7,417.00 Parsecs
Proper Motion Dec.3.60000 ± 0.51000 milliarcseconds/year
Proper Motion RA.16.92000 ± 0.69000 milliarcseconds/year
B-V Index0.19
Radial Velocity-16.10000 ± 4.50 km/s
Eccentricity0.04890
Semi-Major Axis7188.0000000
Stellar Luminosity (Lsun)21.2500000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


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

Estimated Calculated Facts


Radius (x the Sun)2.64
Effective Temperature7,827 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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