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FY Librae, HD132112, HIP73213

FY Librae is a red pulsating giant star that can be located in the constellation of Libra. The star can not be seen by the naked eye, you need a telescope to see it.

FY Librae's Alternative Names

HIP73213 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD132112.

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

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-11 3841.

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

Location of FY Librae

The location of the star in the galaxy 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 FY Librae, the location is 14h 57m 46.54 and -12° 26` 15.2 .

Proper Motion of FY Librae

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 -15.90 ± 0.44 miliarcseconds/year towards the north and 19.79 ± 0.80 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 4.20000 km/s with an error of about 3.00 km/s .

Physical Properties (Colour, Temperature) of FY Librae

FY Librae has a spectral type of M5III. This means the star is a red giant star. The star has a B-V Colour Index of 1.41 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,143 Kelvin.

FY Librae Radius has been calculated as being 22.82 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 15,876,796.28.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 27.31. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FY Librae Apparent and Absolute Magnitudes

FY Librae has an apparent magnitude of 7.14 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -0.50 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.89. 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 FY Librae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.97 which gave the calculated distance to FY Librae as 1098.19 light years away from Earth or 336.70 parsecs. It would take a spaceship travelling at the speed of light, 1098.19 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 2.48 which put FY Librae at a distance of 1315.17 light years or 403.23 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Variable Type of FY Librae

The star is a pulsating Semiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity 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. FY Librae brightness ranges from a magnitude of 7.083 to a magnitude of 6.577 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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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FY Librae Facts

Visual Facts

Alternative NamesHD 132112, HIP 73213, BD-11 3841, FY Lib
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-0.50 / -0.89
Visual / Apparent Magnitude7.14
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)14h 57m 46.54
Declination (Dec.)-12° 26` 15.2
Galactic Latitude39.95 degrees
Galactic Longitude344.78 degrees
1997 Distance from Earth2.97 Parallax (milliarcseconds)
 1098.19 Light Years
 336.70 Parsecs
2007 Revised Distance from Earth2.48 Parallax (milliarcseconds)
 1315.17 Light Years
 403.23 Parsecs
Proper Motion Dec.-15.90 ± 0.44 milliarcseconds/year
Proper Motion RA.19.79 ± 0.80 milliarcseconds/year
B-V Index1.41
Radial Velocity4.20 ± 3.00 km/s
Spectral TypeM5III
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity
Mean Variability Period in Days0.455
Variable Magnitude Range (Brighter - Dimmer)6.577 - 7.083

Estimated Facts

Calculated Effective Temperature4,143 Kelvin

Sources and Links

SIMBAD SourceLink

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