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VV Leporis, HD33978, HIP24318

Primary Facts on VV Leporis

  • VV Leporis's star type is giant star that can be located in the constellation of Lepus. The description is based on the spectral class.
  • VV Leporis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K1III) of the star, the star's colour is orange to red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 712.15 light years away from us.

VV Leporis's Alternative Names

HIP24318 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD33978.

VV Leporis has alternative name(s) :- VV Lep, VV Lep.

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

Location of VV Leporis

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 VV Leporis, the location is 05h 13m 05.22 and -23° 57` 51.7 .

Radial Velocity and Proper Motion of VV Leporis

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 -2.07 ± 0.67 miliarcseconds/year towards the north and 8.56 ± 0.90 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 26.79 km/s with an error of about 0.16 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.

VV Leporis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 25.34 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of VV Leporis

VV Leporis has a spectral type of K1III. This means the star is a orange to red giant star. The star is 7,526.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,547.05 s. The star has a B-V Colour Index of 1.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,830 Kelvin.

VV Leporis Radius has been calculated as being 6.62 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,607,641.13.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 6.35. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

VV Leporis Apparent and Absolute Magnitudes

VV Leporis has an apparent magnitude of 8.31 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 1.52 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.61. 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 VV Leporis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.39 which gave the calculated distance to VV Leporis as 742.97 light years away from Earth or 227.79 parsecs. It would take a spaceship travelling at the speed of light, 742.97 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 4.58 which put VV Leporis at a distance of 712.15 light years or 218.34 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 45,035,543.98 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.

The star's Galacto-Centric Distance is 7,526.00 Parsecs or 24,547.05 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. VV Leporis brightness ranges from a magnitude of 8.515 to a magnitude of 8.437 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 5.3 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 VV Leporis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameVV Leporis
Alternative NamesVV Lep, HD 33978, HIP 24318, VV Lep
Spectral TypeK1III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
Absolute Magnitude 1.52 / 1.61
Visual / Apparent Magnitude8.31
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 13m 05.22
Declination (Dec.)-23° 57` 51.7
Galactic Latitude-31.57 degrees
Galactic Longitude225.69 degrees
1997 Distance from Earth4.39 Parallax (milliarcseconds)
 742.97 Light Years
 227.79 Parsecs
2007 Distance from Earth4.58 Parallax (milliarcseconds)
 712.15 Light Years
 218.34 Parsecs
 45,035,543.98 Astronomical Units
Galacto-Centric Distance24,547.05 Light Years / 7,526.00 Parsecs
Proper Motion Dec.-2.07 ± 0.67 milliarcseconds/year
Proper Motion RA.8.56 ± 0.90 milliarcseconds/year
B-V Index1.01
Radial Velocity26.79 ± 0.16 km/s
Semi-Major Axis7009.00
Stellar Luminosity (Lsun)25.34

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days5.335
Variable Magnitude Range (Brighter - Dimmer)8.437 - 8.515

Estimated Facts

Calculated Effective Temperature4,830 Kelvin

Sources and Links

SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
33978-24 2915.2A8.5000010.0000013.00000K0Orange

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