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CT Lacertae

CT Lacertae Facts

  • CT Lacertae is a pulsating variable star that can be located in the constellation of Lacerta. The description is based on the spectral class.
  • CT Lacertae is not part of the constellation outline but is within the borders of the constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 6154.03 light years away from us. Distance

CT Lacertae's Alternative Names

HIP109158 is the reference name for the star in the Hipparcos Star Catalogue.

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

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

Location of CT Lacertae

The location of the variable 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 CT Lacertae, the location is 22h 06m 39.93 and +48° 27` 06.9 .

Physical Properties of CT Lacertae

CT Lacertae Colour

Based on the star's spectral type of R The star has a B-V Colour Index of 1.63 which means the star's temperature is about 3,689 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

CT Lacertae Radius

CT Lacertae estimated radius has been calculated as being 40.84 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 28,417,305.09.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.

CT Lacertae Apparent and Absolute Magnitudes

CT Lacertae has an apparent magnitude of 10.12 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 -1.26 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 CT Lacertae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.53000 which gave the calculated distance to CT Lacertae as 6154.03 light years away from Earth or 1886.79 parsecs. If you want that in miles, it is about 36,177,236,905,333,131.45, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to CT 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)
Walking41,031,748,713,341.22
Car12034,391,623,778.04
Airbus A3807365,607,329,963.81
Speed of Sound (Mach 1) 767.2695,378,810,890.79
Concorde (Mach 2)1,534.542,689,401,940.23
New Horizons Probe33,000125,060,450.10
Speed of Light670,616,629.006,154.03

Variable Type of CT Lacertae

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. CT Lacertae brightness ranges from a magnitude of 10.955 to a magnitude of 9.896 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.1 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 CT Lacertae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCT Lacertae
Alternative NamesHIP 109158, CT Lac
Spectral TypeR
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
ConstellationLacerta
Absolute Magnitude -1.26
Visual / Apparent Magnitude10.12
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)22h 06m 39.93
Declination (Dec.)+48° 27` 06.9
Galactic Latitude-5.90772066 degrees
Galactic Longitude96.88244398 degrees
Distance from Earth0.53000 Parallax (milliarcseconds)
 6154.03 Light Years
 1886.79 Parsecs
 389,175,661.97 Astronomical Units
B-V Index1.63
Radial Velocity-4.00000 ± 2.70 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 Days1.053
Variable Magnitude Range (Brighter - Dimmer)9.896 - 10.955

Estimated Calculated Facts


Radius (x the Sun)40.84
Effective Temperature3,689 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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