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HV Librae

HV Librae Facts

  • HV Librae is a eruptive variable star that can be located in the constellation of Libra. The description is based on the spectral class.
  • HV Librae is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M...) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 25089.49 light years away from us. Distance

HV Librae's Alternative Names

HIP73445 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD132614.

HV Librae has alternative name(s) :- , HV Lib.

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-11 3854.

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

Location of HV Librae

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 HV Librae, the location is 15h 00m 31.73 and -11° 52` 27.6 .

Physical Properties of HV Librae

HV Librae Temperature and Colour

Based on the star's spectral type of M... , HV Librae's colour and type is red variable star. The star has a B-V Colour Index of 1.58 which means the star's temperature is about 3,828 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HV Librae Radius

HV Librae estimated radius has been calculated as being 406.46 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 282,817,905.99.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 rather than peer reviewed papers. It has been known to produce widely incorrect figures.

HV Librae Apparent and Absolute Magnitudes

HV Librae has an apparent magnitude of 8.02 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 -6.41 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 HV Librae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.13000 which gave the calculated distance to HV Librae as 25089.49 light years away from Earth or 7692.31 parsecs. If you want that in miles, it is about 147,491,712,514,236,451.26, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to HV Librae

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking44,206,357,301,782.30
Car120140,211,910,059.41
Airbus A38073622,860,637,509.69
Speed of Sound (Mach 1)767.26921,928,983,455.78
Concorde (Mach 2)1,534.5410,964,477,437.62
New Horizons Probe33,000509,861,491.13
Speed of Light670,616,629.0025,089.49

Variable Type of HV Librae

The star is a eruptive Irregular 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. HV Librae brightness ranges from a magnitude of 8.096 to a magnitude of 7.890 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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 HV Librae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHV Librae
Alternative NamesHD 132614, HIP 73445, BD-11 3854, HV Lib
Spectral TypeM...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationLibra
Absolute Magnitude -6.41
Visual / Apparent Magnitude8.02
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 00m 31.73
Declination (Dec.)-11° 52` 27.6
Galactic Latitude39.98378892 degrees
Galactic Longitude345.92774602 degrees
Distance from Earth0.13000 Parallax (milliarcseconds)
 25089.49 Light Years
 7692.31 Parsecs
 1,586,641,775.87 Astronomical Units
B-V Index1.58

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.165
Variable Magnitude Range (Brighter - Dimmer)7.890 - 8.096

Estimated Calculated Facts


Radius (x the Sun)406.46
Effective Temperature 3,828 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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