Universe Guide


Epsilon Leporis, 2 Leporis, HD32887, HIP23685

Epsilon Leporis is a orange to red giant star that can be located in the constellation of Lepus. Epsilon Leporis is the brightest star in Lepus based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Epsilon Leporis is the Bayer Classification for the star. HIP23685 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32887.

Location of Epsilon Leporis

The location of the star in the galaxy 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 Epsilon Leporis, the location is 05h 05m 27.65 and -22d22`15.1 .

Proper Motion of Epsilon 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 -73.11 ± 0.12 miliarcseconds/year towards the north and 21.13 ± 0.19 miliarcseconds/year east if we saw them in the horizon.

Epsilon 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 45.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Epsilon Leporis

Epsilon Leporis has a spectral type of K4III. This means the star is a orange to red giant star. The star is 7440.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24266.5527936000000000s. The star has a B-V Colour Index of 1.46 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,059 Kelvin.

Epsilon Leporis Radius has been calculated as being 30.20 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 21,016,468.51.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 28.45. 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 -0.11 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Epsilon Leporis Apparent and Absolute Magnitudes

Epsilon Leporis has an apparent magnitude of 3.19 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 -1.02 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.89. 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 Epsilon Leporis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.39 which gave the calculated distance to Epsilon Leporis as 226.66 light years away from Earth or 69.49 parsecs. It would take a spaceship travelling at the speed of light, 226.66 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 15.29 which put Epsilon Leporis at a distance of 213.32 light years or 65.40 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.

The star's Galacto-Centric Distance is 7,440.00 Parsecs or 24,266.55 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Epsilon Leporis Facts

Alternative Names

Flamsteed Name2 Leporis
Flamsteed Short Name2 Lep
Bayer DesignationEpsilon Leporis
Hipparcos Library I.D.23685
Bonner DurchmusterungBD-22 1000
Henry Draper Designation32887

Visual Facts

Star Typegiant star
Absolute Magnitude-1.02 / -0.89
Visual / Apparent Magnitude3.19
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 05m 27.65
Declination (Dec.)-22d22`15.1
Galactic Latitude-32.73 degrees
Galactic Longitude223.25 degrees
1997 Distance from Earth14.39 Parallax (milliarcseconds)
 226.66 Light Years
 69.49 Parsecs
2007 Revised Distance from Earth15.29 Parallax (milliarcseconds)
 213.32 Light Years
 65.40 Parsecs
Galacto-Centric Distance24,266.55 Light Years / 7,440.00 Parsecs
Proper Motion Dec.-73.11 ± 0.12 milliarcseconds/year
Proper Motion RA.21.13 ± 0.19 milliarcseconds/year
B-V Index1.46
Radial Velocity1.00 ± 0.60 km/s
Iron Abundance-0.11 ± 9.99 Fe/H
Spectral TypeK4III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)45.0000000
Calculated Effective Temperature4,059 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Add a Comment

Email: (Optional)