Universe Guide

EI Leonis

EI Leonis Facts

EI Leonis's Alternative Names

HIP46994 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD82819.

EI Leonis has alternative name(s) :- , EI Leo.

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+08 2243.

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

Location of EI Leonis

The location of the giant 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 EI Leonis, the location is 09h 34m 41.46 and +08° 11` 14.9 .

Radial Velocity and Proper Motion of EI Leonis

Proper Motion

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 -0.42 ± 0.43 milliarcseconds/year towards the north and 6.76 ± 0.62 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 39.18 km/s with an error of about 0.69 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, Temperature) of EI Leonis

EI Leonis Colour and Temperature

EI Leonis has a spectral type of M3III:. This means the star is a red giant star. The star has a B-V Colour Index of 1.67 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,575 Kelvin.

EI Leonis Radius

Radius has been calculated as being 101.95 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 70,935,930.58.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 142.03. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

EI Leonis Apparent and Absolute Magnitudes

EI Leonis has an apparent magnitude of 7.35 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 -3.11 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.83. 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 EI Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.81 which gave the calculated distance to EI Leonis as 4026.71 light years away from Earth or 1234.57 parsecs. It would take a spaceship travelling at the speed of light, 4026.71 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 0.58 which put EI Leonis at a distance of 5623.51 light years or 1724.14 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 355,626,925.00 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 EI Leonis

The star is a pulsating Semi-Regular Star w 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. EI Leonis brightness ranges from a magnitude of 7.488 to a magnitude of 7.380 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 EI Leonis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameEI Leonis
Alternative NamesHD 82819, HIP 46994, BD+08 2243, EI Leo
Spectral TypeM3III:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude -3.11 / -3.83
Visual / Apparent Magnitude7.35
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)09h 34m 41.46
Declination (Dec.)+08° 11` 14.9
Galactic Latitude39.84 degrees
Galactic Longitude225.59 degrees
1997 Distance from Earth0.81 Parallax (milliarcseconds)
 4026.71 Light Years
 1234.57 Parsecs
2007 Distance from Earth0.58 Parallax (milliarcseconds)
 5623.51 Light Years
 1724.14 Parsecs
 355,626,925.00 Astronomical Units
Proper Motion Dec.-0.42 ± 0.43 milliarcseconds/year
Proper Motion RA.6.76 ± 0.62 milliarcseconds/year
B-V Index1.67
Radial Velocity39.18 ± 0.69 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.113
Variable Magnitude Range (Brighter - Dimmer)7.380 - 7.488

Estimated Calculated Facts

Radius (x the Sun)142.03
Effective Temperature3,575 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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