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Rijl al Awwa, Mu Virginis, 107 Virginis, HD129502, HIP71957

Rijl al Awwa (Mu Virginis) is a blue to white giant star that can be located in the constellation of Virgo. Rijl al Awwa is the brightest star in Virgo based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 1.50 Billion of Years but could be as young as 1.40 to 1.60 according to Hipparcos.

Mu Virginis is the Bayer Classification for the star. HIP71957 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD129502. The Id of the star in the Gould Star Catalogue is 255. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Location of Rijl al Awwa

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 Rijl al Awwa, the location is 14h 43m 03.56 and -05d39`26.7 .

Proper Motion of Rijl al Awwa

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 -318.63 ± 0.15 miliarcseconds/year towards the north and 103.28 ± 0.20 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of Rijl al Awwa

Rijl al Awwa has a spectral type of F2III. This means the star is a blue to white giant star. The star is 7388.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24096.9478547200000000s. The star has a B-V Colour Index of 0.38 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,822 Kelvin.

Rijl al Awwa Radius has been calculated as being 2.10 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,463,995.55.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.06. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.04 with an error value of 0.08 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.50 Billion years old but could be between 1.40 and 1.60 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Rijl al Awwa Apparent and Absolute Magnitudes

Rijl al Awwa has an apparent magnitude of 3.87 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 2.51 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.56. 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 Rijl al Awwa

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 53.54 which gave the calculated distance to Rijl al Awwa as 60.92 light years away from Earth or 18.68 parsecs. It would take a spaceship travelling at the speed of light, 60.92 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 54.73 which put Rijl al Awwa at a distance of 59.59 light years or 18.27 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 7,388.00 Parsecs or 24,096.95 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Meteor Showers Radiating from near Rijl al Awwa

The Mu Virginids Meteor Shower radiants from a point near this star. The meteor shower runs typically between 1-Apr - 12-May with a peak date of 24 - Apr. The speed of a meteor in the shower is 28 Km/s.

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.

Rijl al Awwa Facts

Alternative Names

Traditional/Proper NameRijl al Awwa
Flamsteed Name107 Virginis
Flamsteed Short Name107 Vir
Bayer DesignationMu Virginis
Hipparcos Library I.D.71957
Bonner DurchmusterungBD-05 3936
Gould I.D.255
Henry Draper Designation129502

Visual Facts

Star Typegiant star
Age1.50 Billion Years Old
Age Range1.40 - 1.60 Billion Years Old
Absolute Magnitude2.51 / 2.56
Visual / Apparent Magnitude3.87
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)14h 43m 03.56
Declination (Dec.)-05d39`26.7
Galactic Latitude47.54 degrees
Galactic Longitude346.55 degrees
1997 Distance from Earth53.54 Parallax (milliarcseconds)
 60.92 Light Years
 18.68 Parsecs
2007 Revised Distance from Earth54.73 Parallax (milliarcseconds)
 59.59 Light Years
 18.27 Parsecs
Galacto-Centric Distance24,096.95 Light Years / 7,388.00 Parsecs
Proper Motion Dec.-318.63 ± 0.15 milliarcseconds/year
Proper Motion RA.103.28 ± 0.20 milliarcseconds/year
B-V Index0.38
Radial Velocity5.10 ± 0.70 km/s
Iron Abundance0.04 ± 0.08 Fe/H
Spectral TypeF2III
Colour(F) blue to white

Estimated Facts

Calculated Effective Temperature6,822 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Rijl al Awwa in Virgo


Rijl al Awwa (Mu Virginis) Location in Virgo

The map was generated using Night Vision, an awesome free application by Brian Simpson.


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