Universe Guide

CG Librae

CG Librae Facts

  • CG Librae is a pulsating variable star that can be located in the constellation of Libra. The description is based on the spectral class.
  • CG Librae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F1) of the star, the star's colour is yellow to 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 -566.26 light years away from us. Distance

CG Librae's Alternative Names

HIP76313 is the reference name for the star in the Hipparcos Star Catalogue.

CG Librae has alternative name(s) :- CG Lib, CG Lib.

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

Location of CG Librae

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 CG Librae, the location is 15h 35m 16.84 and -24° 20` 12.3 .

Physical Properties of CG Librae

CG Librae Temperature and Colour

Based on the star's spectral type of F1 , CG Librae's colour and type is yellow to white variable star. The star has a B-V Colour Index of 0.5 which means the star's temperature is about 6,114 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

CG Librae Radius

CG Librae Iron Abundance

CG Librae Iron Abundance is -1.15 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

CG Librae Apparent and Absolute Magnitudes

CG Librae has an apparent magnitude of 11.44 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 CG Librae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -5.76 which gave the calculated distance to CG Librae as -566.26 light years away from Earth or -173.61 parsecs. If you want that in miles, it is about -3,328,830,403,818,951.00, based on 1 Ly = 5,878,625,373,183.61 miles.

Variable Type of CG Librae

The star is a pulsating RR Lyrae type with n 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. CG Librae brightness ranges from a magnitude of 11.928 to a magnitude of 11.323 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 CG Librae Facts and Figures

Visual Facts

Primary / Proper / Traditional NameCG Librae
Alternative NamesCG Lib, HIP 76313, CG Lib
Spectral TypeF1
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
Visual / Apparent Magnitude11.44
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)15h 35m 16.84
Declination (Dec.)-24° 20` 12.3
Galactic Latitude25.12 degrees
Galactic Longitude344.21 degrees
Distance from Earth-5.76 Parallax (milliarcseconds)
 -566.26 Light Years
 -173.61 Parsecs
 -35,809,383.49 Astronomical Units
B-V Index0.50
Radial Velocity-178.60 ± 2.80 km/s
Iron Abundance-1.15 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeRR Lyrae type with n
Mean Variability Period in Days0.307
Variable Magnitude Range (Brighter - Dimmer)11.323 - 11.928

Estimated Calculated Facts

Effective Temperature6,114 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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