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Sigma Virginis, 60 Virginis, HD115521, HIP64852, HR5015

Sigma Virginis is a red pulsating giant star that can be located in the constellation of Virgo. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Sigma Virginis's Alternative Names

Sigma Virginis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR5015. HIP64852 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD115521.

Sigma Virginis has alternative name(s) :- , NSV 06173.

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 60 Virginis with it shortened to 60 Vir.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 130 G. Virginis. There are no stars with a Gould designation in Ursa Major for example.

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+06 2722.

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

Location of Sigma Virginis

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 Sigma Virginis, the location is 13h 17m 36.29 and +05° 28` 11.4 .

Proper Motion of Sigma Virginis

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 9.14 ± 0.12 miliarcseconds/year towards the north and -6.06 ± 0.19 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 -28.26000 km/s with an error of about 0.30 km/s .

Physical Properties (Colour, Temperature) of Sigma Virginis

Sigma Virginis has a spectral type of M2III. This means the star is a red giant star. The star is 7342.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23946.9127164800000000s. The star has a B-V Colour Index of 1.63 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,700 Kelvin.

Sigma Virginis Radius has been calculated as being 41.74 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 29,040,048.76.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 52.06. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Sigma Virginis Apparent and Absolute Magnitudes

Sigma Virginis has an apparent magnitude of 4.78 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 -1.32 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.80. 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 Sigma Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.03 which gave the calculated distance to Sigma Virginis as 540.90 light years away from Earth or 165.84 parsecs. It would take a spaceship travelling at the speed of light, 540.90 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 4.83 which put Sigma Virginis at a distance of 675.29 light years or 207.04 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 7,342.00 Parsecs or 23,946.91 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 Sigma Virginis

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. Sigma Virginis brightness ranges from a magnitude of 4.913 to a magnitude of 4.839 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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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Sigma Virginis Facts

Visual Facts

Alternative NamesHD 115521, HIP 64852, HR 5015, 130 G. Virginis, 60 Virginis, 60 Vir, BD+06 2722, NSV 06173
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude-1.32 / -1.80
Visual / Apparent Magnitude4.78
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 17m 36.29
Declination (Dec.)+05° 28` 11.4
Galactic Latitude67.46 degrees
Galactic Longitude320.14 degrees
1997 Distance from Earth6.03 Parallax (milliarcseconds)
 540.90 Light Years
 165.84 Parsecs
2007 Revised Distance from Earth4.83 Parallax (milliarcseconds)
 675.29 Light Years
 207.04 Parsecs
Galacto-Centric Distance23,946.91 Light Years / 7,342.00 Parsecs
Proper Motion Dec.9.14 ± 0.12 milliarcseconds/year
Proper Motion RA.-6.06 ± 0.19 milliarcseconds/year
B-V Index1.63
Radial Velocity-28.26 ± 0.30 km/s
Semi-Major Axis9599.00
Spectral TypeM2III
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.077
Variable Magnitude Range (Brighter - Dimmer)4.839 - 4.913

Estimated Facts

Calculated Effective Temperature3,700 Kelvin

Sources and Links

SIMBAD SourceLink

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