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71 Leonis, HD98824, HIP55533

71 Leonis is a orange to red giant star that can be located in the constellation of Leo. The star can not be seen by the naked eye, you need a telescope to see it.

71 Leonis's Alternative Names

HIP55533 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD98824.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 71 Leonis with it shortened to 71 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+18 2481.

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

Location of 71 Leonis

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 71 Leonis, the location is 11h 22m 29.02 and +17° 26` 13.4 .

Proper Motion of 71 Leonis

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 -16.93 ± 0.48 miliarcseconds/year towards the north and -117.22 ± 0.69 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 5.88000 km/s with an error of about 0.12 km/s .

71 Leonis 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 51.4200000 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 71 Leonis

71 Leonis has a spectral type of K1III. This means the star is a orange to red giant star. The star is 7439.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24263.2911601600000000s. 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 4,736 Kelvin.

71 Leonis Radius has been calculated as being 12.88 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,965,259.65.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 8.87. 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 0.01 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

71 Leonis Apparent and Absolute Magnitudes

71 Leonis has an apparent magnitude of 7.03 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 0.16 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.97. 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 71 Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.22 which gave the calculated distance to 71 Leonis as 772.90 light years away from Earth or 236.97 parsecs. It would take a spaceship travelling at the speed of light, 772.90 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 6.13 which put 71 Leonis at a distance of 532.08 light years or 163.13 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 7,439.00 Parsecs or 24,263.29 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.

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71 Leonis Facts

Visual Facts

Alternative NamesHD 98824, HIP 55533, 71 Leo, BD+18 2481
Star TypeGiant Star
GalaxyMilky Way
Absolute Magnitude0.16 / 0.97
Visual / Apparent Magnitude7.03
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)11h 22m 29.02
Declination (Dec.)+17° 26` 13.4
Galactic Latitude67.30 degrees
Galactic Longitude233.57 degrees
1997 Distance from Earth4.22 Parallax (milliarcseconds)
 772.90 Light Years
 236.97 Parsecs
2007 Revised Distance from Earth6.13 Parallax (milliarcseconds)
 532.08 Light Years
 163.13 Parsecs
Galacto-Centric Distance24,263.29 Light Years / 7,439.00 Parsecs
Proper Motion Dec.-16.93 ± 0.48 milliarcseconds/year
Proper Motion RA.-117.22 ± 0.69 milliarcseconds/year
B-V Index1.06
Radial Velocity5.88 ± 0.12 km/s
Iron Abundance0.01 ± 0.04 Fe/H
Semi-Major Axis5937.00
Stellar Luminosity (Lsun)51.42
Spectral TypeK1III
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,736 Kelvin

Sources and Links

SIMBAD SourceLink

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