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RU Virginis (Carbon Star) Facts

RU Virginis Facts

  • RU Virginis is a pulsating Carbon star that can be located in the constellation of Virgo. The description is based on the spectral class.
  • RU Virginis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (C0) of the star, the star's colour is carbon red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • RU Virginis has a radius that is 740.00 times bigger than the Suns. Radius
  • Using the most recent figures given by the 2007 Hipparcos data, the star is -1744.19 light years away from us. Distance

RU Virginis's Alternative Names

HIP62401 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD111166.

RU Virginis has alternative name(s) :- RU Vir, RU Vir.

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+04 2651a.

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

Location of RU Virginis

The location of the Carbon 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 RU Virginis, the location is 12h 47m 18.41 and +04° 08` 41.6 .

Physical Properties of RU Virginis

RU Virginis Temperature and Colour

Based on the star's spectral type of C0 , RU Virginis's colour and type is carbon red Carbon star. The star has a B-V Colour Index of 4.4 which means the star's temperature is about 0 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

RU Virginis Radius

RU Virginis Radius has been calculated as being 740.00 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 514,892,000.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

RU Virginis Apparent and Absolute Magnitudes

RU Virginis has an apparent magnitude of 11.98 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 If you used the 2007 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 RU Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -2.25000 which gave the calculated distance to RU Virginis as -1449.61 light years away from Earth or -444.44 parsecs. If you want that in miles, it is about -8,521,714,127,220,692.89, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of -1.87000 which put RU Virginis at a distance of -1744.19 light years or -534.76 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.

Using the 2007 distance, the star is roughly -110,301,399.20 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Variable Type of RU Virginis

The star is a pulsating Omicron Ceti 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. RU Virginis brightness ranges from a magnitude of 11.761 to a magnitude of 10.034 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 443.7 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 RU Virginis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameRU Virginis
Alternative NamesRU Vir, HD 111166, HIP 62401, BD+04 2651a, RU Vir
Spectral TypeC0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeCarbon Star
ColourRed
GalaxyMilky Way
ConstellationVirgo
Visual / Apparent Magnitude11.98
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)12h 47m 18.41
Declination (Dec.)+04° 08` 41.6
Galactic Latitude66.99548085 degrees
Galactic Longitude300.29530572 degrees
1997 Distance from Earth-2.25000 Parallax (milliarcseconds)
 -1449.61 Light Years
 -444.44 Parsecs
2007 Distance from Earth-1.87000 Parallax (milliarcseconds)
 -1744.19 Light Years
 -534.76 Parsecs
 -110,301,399.20 Astronomical Units
B-V Index4.4
Radial Velocity2.00000 ± 3.50 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days443.700
Variable Magnitude Range (Brighter - Dimmer)10.034 - 11.761

Estimated Calculated Facts


Radius (x the Sun)740.00
Calculated Temperature Range2,400.00 - 3,700.00

Sources and Links


SIMBAD SourceLink

Related Stars


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