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VX Herculis, HIP80853

Primary Facts on VX Herculis

  • VX Herculis's star type is pulsating variable star that can be located in the constellation of Hercules. The description is based on the spectral class.
  • VX Herculis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A8.2) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 6939.65 light years away from us.

VX Herculis's Alternative Names

HIP80853 is the reference name for the star in the Hipparcos Star Catalogue.

VX Herculis has alternative name(s) :- VX Her, VX Her.

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+18 3186.

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

Location of VX Herculis

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For VX Herculis, the location is 16h 30m 40.83 and +18° 22` 00.4 .

Physical Properties (Colour, Temperature) of VX Herculis

VX Herculis has a spectral type of A8.2. This means the star is a blue variable star. The star has a B-V Colour Index of 0.21 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,325 Kelvin.

VX Herculis Radius has been calculated as being 8.70 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,050,359.94.km. If you need the diameter of the star, you just need to multiple the radius by 2. 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 -1.51 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

VX Herculis Apparent and Absolute Magnitudes

VX Herculis has an apparent magnitude of 10.76 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 -0.88 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 VX Herculis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.47 which gave the calculated distance to VX Herculis as 6939.65 light years away from Earth or 2127.66 parsecs. It would take a spaceship travelling at the speed of light, 6939.65 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of VX Herculis

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. VX Herculis brightness ranges from a magnitude of 11.324 to a magnitude of 9.962 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.5 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 VX Herculis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameVX Herculis
Alternative NamesVX Her, HIP 80853, BD+18 3186, VX Her
Spectral TypeA8.2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour blue
GalaxyMilky Way
ConstellationHercules
Absolute Magnitude -0.88
Visual / Apparent Magnitude10.76
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)16h 30m 40.83
Declination (Dec.)+18° 22` 00.4
Galactic Latitude39.08 degrees
Galactic Longitude35.22 degrees
Distance from Earth0.47 Parallax (milliarcseconds)
 6939.65 Light Years
 2127.66 Parsecs
 438,858,319.65 Astronomical Units
B-V Index0.21
Radial Velocity-376.70 ± 2.80 km/s
Iron Abundance-1.51 ± 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 Days0.455
Variable Magnitude Range (Brighter - Dimmer)9.962 - 11.324

Estimated Facts


Calculated Effective Temperature7,325 Kelvin

Sources and Links


SIMBAD SourceLink

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