Universe Guide

AU Virginis

AU Virginis Facts

AU Virginis's Alternative Names

HIP65445 is the reference name for the star in the Hipparcos Star Catalogue.

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

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

Location of AU Virginis

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 AU Virginis, the location is 13h 24m 48.01 and -06° 58` 45.3 .

Physical Properties (Colour, Temperature) of AU Virginis

AU Virginis Colour and Temperature

AU Virginis has a spectral type of A9.5:. This means the star is a blue - white variable star. The star has a B-V Colour Index of 0.24 which means the star's temperature is about 7,120 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being . The star's Iron Abundance is -1.45 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

AU Virginis Apparent and Absolute Magnitudes

AU Virginis has an apparent magnitude of 11.62 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 AU Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.21 which gave the calculated distance to AU Virginis as -15531.59 light years away from Earth or -4761.90 parsecs. If you want that in miles, it is -10,415,742,528,810.

Variable Type of AU Virginis

The star is a pulsating RR Lyrae type with n 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. AU Virginis brightness ranges from a magnitude of 12.037 to a magnitude of 11.441 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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Additional AU Virginis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAU Virginis
Alternative NamesAU Vir, HIP 65445, AU Vir
Spectral TypeA9.5:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Visual / Apparent Magnitude11.62
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)13h 24m 48.01
Declination (Dec.)-06° 58` 45.3
Galactic Latitude54.95 degrees
Galactic Longitude317.45 degrees
Distance from Earth-0.21 Parallax (milliarcseconds)
 -15531.59 Light Years
 -4761.90 Parsecs
 -982,205,536.76 Astronomical Units
B-V Index0.24
Radial Velocity122.00 ± 9.20 km/s
Iron Abundance-1.45 ± 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 n
Mean Variability Period in Days0.343
Variable Magnitude Range (Brighter - Dimmer)11.441 - 12.037

Estimated Calculated Facts

Effective Temperature7,120 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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