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R Lyrae, 13 Lyrae, HD175865, HIP92862, HR7157

R Lyrae Location in Lyra

R Lyrae is a red pulsating giant star that can be located in the constellation of Lyra. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

R Lyrae's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR7157. HIP92862 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD175865.

R Lyrae has alternative name(s) :- , R Lyr.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 13 Lyrae with it shortened to 13 Lyr.

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 3117.

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

Location of R Lyrae

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 R Lyrae, the location is 18h 55m 20.09 and +43° 56` 45.2 .

Proper Motion of R Lyrae

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 82.06 ± 0.11 miliarcseconds/year towards the north and 21.05 ± 0.12 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 -27.15000 km/s with an error of about 0.20 km/s .

R Lyrae 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 382.16 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 R Lyrae

R Lyrae has a spectral type of M5IIIvar. This means the star is a red giant star. The star is 7,376.00 Parsecs from the Galactic Centre or terms of Light Years is 24,057.81 s. The star has a B-V Colour Index of 1.39 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,176 Kelvin.

R Lyrae Radius has been calculated as being 29.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 20,317,831.53.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 24.85. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

R Lyrae Apparent and Absolute Magnitudes

R Lyrae has an apparent magnitude of 4.08 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 -1.07 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.72. 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 R Lyrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.33 which gave the calculated distance to R Lyrae as 349.59 light years away from Earth or 107.18 parsecs. It would take a spaceship travelling at the speed of light, 349.59 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 10.94 which put R Lyrae at a distance of 298.14 light years or 91.41 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.

The star's Galacto-Centric Distance is 7,376.00 Parsecs or 24,057.81 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 R Lyrae

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. R Lyrae brightness ranges from a magnitude of 4.135 to a magnitude of 3.821 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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R Lyrae Facts

Visual Facts


Primary / Proper / Traditional NameR Lyrae
Alternative NamesR Lyr, HD 175865, HIP 92862, HR 7157, 13 Lyrae, 13 Lyr, BD+43 3117, R Lyr
Spectral TypeM5IIIvar
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
ConstellationLyra
Absolute Magnitude-1.07 / -0.72
Visual / Apparent Magnitude4.08
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 55m 20.09
Declination (Dec.)+43° 56` 45.2
Galactic Latitude17.79 degrees
Galactic Longitude73.81 degrees
1997 Distance from Earth9.33 Parallax (milliarcseconds)
 349.59 Light Years
 107.18 Parsecs
2007 Distance from Earth10.94 Parallax (milliarcseconds)
 298.14 Light Years
 91.41 Parsecs
Galacto-Centric Distance24,057.81 Light Years / 7,376.00 Parsecs
Proper Motion Dec.82.06 ± 0.11 milliarcseconds/year
Proper Motion RA.21.05 ± 0.12 milliarcseconds/year
B-V Index1.39
Radial Velocity-27.15 ± 0.20 km/s
Eccentricity0.15
Semi-Major Axis7319.00
Stellar Luminosity (Lsun)382.16

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

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 Days0.266
Variable Magnitude Range (Brighter - Dimmer)3.821 - 4.135

Estimated Facts


Calculated Effective Temperature4,176 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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