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T Leporis, HD32803, HIP23636

T Leporis is a red pulsating variable star that can be located in the constellation of Lepus. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

T Leporis's Alternative Names

HIP23636 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32803.

T Leporis has alternative name(s) :- , T 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-22 995.

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

Location of T 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 T Leporis, the location is 05h 04m 50.84 and -21° 54` 16.2 .

Proper Motion of T 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 -33.34 ± 0.66 miliarcseconds/year towards the north and 11.43 ± 1.03 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 us is -4.00000 km/s with an error of about 4.70 km/s .

Physical Properties (Colour, Temperature) of T Leporis

T Leporis has a spectral type of M6e-M9e. This means the star is a red variable star. The star has a B-V Colour Index of 1.06 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,845 Kelvin.

T Leporis Apparent and Absolute Magnitudes

T Leporis has an apparent magnitude of 9.95 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 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.38. 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 T Leporis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.77 which gave the calculated distance to T Leporis as -1842.73 light years away from Earth or -564.97 parsecs. It would take a spaceship travelling at the speed of light, -1842.73 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 1.22 which put T Leporis at a distance of 2673.47 light years or 819.67 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.

Variable Type of T Leporis

The star is a pulsating Omicron Ceti 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. T Leporis brightness ranges from a magnitude of 10.565 to a magnitude of 7.671 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 370.0 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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T Leporis Facts

Visual Facts


Primary / Proper / Traditional NameT Leporis
Alternative NamesHD 32803, HIP 23636, BD-22 995, T Lep
Spectral TypeM6e-M9e
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
ConstellationLepus
Visual / Apparent Magnitude9.95
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 04m 50.84
Declination (Dec.)-21° 54` 16.2
Galactic Latitude-32.71 degrees
Galactic Longitude222.67 degrees
1997 Distance from Earth-1.77 Parallax (milliarcseconds)
 -1842.73 Light Years
 -564.97 Parsecs
2007 Distance from Earth1.22 Parallax (milliarcseconds)
 2673.47 Light Years
 819.67 Parsecs
Proper Motion Dec.-33.34 ± 0.66 milliarcseconds/year
Proper Motion RA.11.43 ± 1.03 milliarcseconds/year
B-V Index1.06
Radial Velocity-4.00 ± 4.70 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti
Mean Variability Period in Days370.000
Variable Magnitude Range (Brighter - Dimmer)7.671 - 10.565

Estimated Facts


Calculated Effective Temperature4,845 Kelvin

Sources and Links


SIMBAD SourceLink

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