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CN Lyrae

CN Lyrae Facts

CN Lyrae's Alternative Names

HIP91634 is the reference name for the star in the Hipparcos Star Catalogue.

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

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

Location of CN Lyrae

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 CN Lyrae, the location is 18h 41m 15.95 and +28° 43` 21.2 .

Physical Properties (Colour) of CN Lyrae

CN Lyrae has a spectral type of F2.5. This means the star is a blue to white variable star. The star's Iron Abundance is -0.47 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

CN Lyrae Apparent and Absolute Magnitudes

CN Lyrae has an apparent magnitude of 11.48 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 CN Lyrae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.68 which gave the calculated distance to CN Lyrae as -1217.03 light years away from Earth or -373.13 parsecs. It would take a spaceship travelling at the speed of light, -1217.03 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of CN Lyrae

The star is a pulsating RR Lyrae type with a 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. CN Lyrae brightness ranges from a magnitude of 11.838 to a magnitude of 11.266 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.4 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 CN Lyrae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCN Lyrae
Alternative NamesCN Lyr, HIP 91634, CN Lyr
Spectral TypeF2.5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
ConstellationLyra
Visual / Apparent Magnitude11.48
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)18h 41m 15.95
Declination (Dec.)+28° 43` 21.2
Galactic Latitude14.70 degrees
Galactic Longitude58.01 degrees
Distance from Earth-2.68 Parallax (milliarcseconds)
 -1217.03 Light Years
 -373.13 Parsecs
 -76,963,050.87 Astronomical Units
B-V Index-99.00
Radial Velocity24.80 ± 2.20 km/s
Iron Abundance-0.47 ± 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 a
Mean Variability Period in Days0.411
Variable Magnitude Range (Brighter - Dimmer)11.266 - 11.838

Sources and Links


SIMBAD SourceLink

Related Stars


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