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U Leporis, HD31599, HIP22952

Primary Facts on U Leporis

  • U Leporis's star type is pulsating supergiant star that can be located in the constellation of Lepus. The description is based on the spectral class.
  • U Leporis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A9/F0Iab:) 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 1907.39 light years away from us.

U Leporis's Alternative Names

HIP22952 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD31599.

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

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-21 1019.

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

Location of U 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 U Leporis, the location is 04h 56m 17.96 and -21° 13` 01.5 .

Radial Velocity and Proper Motion of U 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 -59.59 ± 1.28 miliarcseconds/year towards the north and 41.45 ± 1.93 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 120.00 km/s with an error of about 2.50 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 U Leporis

U Leporis has a spectral type of A9/F0Iab:. This means the star is a blue supergiant star. The star's Iron Abundance is -1.78 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

U Leporis Apparent and Absolute Magnitudes

U Leporis has an apparent magnitude of 10.91 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 3.41 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.07. 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 U Leporis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.16 which gave the calculated distance to U Leporis as 1032.16 light years away from Earth or 316.46 parsecs. It would take a spaceship travelling at the speed of light, 1032.16 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 1.71 which put U Leporis at a distance of 1907.39 light years or 584.80 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 120,622,818.18 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 U Leporis

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. U Leporis brightness ranges from a magnitude of 11.163 to a magnitude of 9.851 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 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 U Leporis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameU Leporis
Alternative NamesHD 31599, HIP 22952, BD-21 1019, U Lep
Spectral TypeA9/F0Iab:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationLepus
Absolute Magnitude 3.41 / 2.07
Visual / Apparent Magnitude10.91
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)04h 56m 17.96
Declination (Dec.)-21° 13` 01.5
Galactic Latitude-34.37 degrees
Galactic Longitude221.11 degrees
1997 Distance from Earth3.16 Parallax (milliarcseconds)
 1032.16 Light Years
 316.46 Parsecs
2007 Distance from Earth1.71 Parallax (milliarcseconds)
 1907.39 Light Years
 584.80 Parsecs
 120,622,818.18 Astronomical Units
Proper Motion Dec.-59.59 ± 1.28 milliarcseconds/year
Proper Motion RA.41.45 ± 1.93 milliarcseconds/year
B-V Index-99.00
Radial Velocity120.00 ± 2.50 km/s
Iron Abundance-1.78 ± 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 Days0.582
Variable Magnitude Range (Brighter - Dimmer)9.851 - 11.163

Sources and Links


SIMBAD SourceLink

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