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AV Virginis

AV Virginis Facts

AV Virginis's Alternative Names

HIP65063 is the reference name for the star in the Hipparcos Star Catalogue.

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

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

Location of AV 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 AV Virginis, the location is 13h 20m 11.56 and +09° 11` 16.7 .

Radial Velocity and Proper Motion of AV Virginis

Proper Motion

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 -38.57 ± 1.64 milliarcseconds/year towards the north and 11.74 ± 2.73 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 45.00 km/s with an error of about 5.00 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour) of AV Virginis

AV Virginis Colour and Temperature

AV Virginis has a spectral type of F2.5. This means the star is a blue to white variable star. The star's Iron Abundance is -1.25 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

AV Virginis Apparent and Absolute Magnitudes

AV Virginis has an apparent magnitude of 11.86 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 4.26 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.13. 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 AV Virginis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.02 which gave the calculated distance to AV Virginis as 1080.01 light years away from Earth or 331.13 parsecs. It would take a spaceship travelling at the speed of light, 1080.01 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 2.84 which put AV Virginis at a distance of 1148.46 light years or 352.11 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 72,627,394.85 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 AV Virginis

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. AV Virginis brightness ranges from a magnitude of 12.293 to a magnitude of 11.461 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.7 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 AV Virginis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameAV Virginis
Alternative NamesAV Vir, HIP 65063, AV Vir
Spectral TypeF2.5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
Absolute Magnitude 4.26 / 4.13
Visual / Apparent Magnitude11.86
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)13h 20m 11.56
Declination (Dec.)+09° 11` 16.7
Galactic Latitude70.82 degrees
Galactic Longitude325.01 degrees
1997 Distance from Earth3.02 Parallax (milliarcseconds)
 1080.01 Light Years
 331.13 Parsecs
2007 Distance from Earth2.84 Parallax (milliarcseconds)
 1148.46 Light Years
 352.11 Parsecs
 72,627,394.85 Astronomical Units
Proper Motion Dec.-38.57 ± 1.64 milliarcseconds/year
Proper Motion RA.11.74 ± 2.73 milliarcseconds/year
B-V Index-99.00
Radial Velocity45.00 ± 5.00 km/s
Iron Abundance-1.25 ± 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 Days0.657
Variable Magnitude Range (Brighter - Dimmer)11.461 - 12.293

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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