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93 Leonis

93 Leonis Facts

93 Leonis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR4527. HIP57565 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD102509.

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 93 Leonis with it shortened to 93 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+21 2358.

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

Location of 93 Leonis

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 object is compared to the celestial equator and is expressed in degrees. For 93 Leonis, the location is 11h 47m 59.23 and +20° 13` 08.2 .

Radial Velocity and Proper Motion of 93 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 -4.34 ± 0.13 milliarcseconds/year towards the north and -145.49 ± 0.23 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 0.50 km/s with an error of about 0.21 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.

93 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 70.83 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 93 Leonis

93 Leonis Colour and Temperature

93 Leonis has a spectral type of A comp SB. This means the star is a blue - white star. The star has a B-V Colour Index of 0.54 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,016 Kelvin.

93 Leonis Radius

Radius has been calculated as being 7.45 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,185,243.21.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 7.70. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

93 Leonis Apparent and Absolute Magnitudes

93 Leonis has an apparent magnitude of 4.50 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 0.31 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.24. 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 93 Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.40 which gave the calculated distance to 93 Leonis as 226 light years away from Earth or 69 parsecs. If you want that in miles, it is 151,559,358,154.

In 2007, Hipparcos data was revised with a new parallax of 14.02 which put 93 Leonis at a distance of 232 light years or 71 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 14,644,699.20 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.

The star's Galacto-Centric Distance is 7,412.00 Parsecs or 24,175.23 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to 93 Leonis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking438,895,764,482.00
Car1201,296,525,482.00
Airbus A380736211,390,024.00
Speed of Sound (Mach 1)767.269202,775,112.00
Concorde (Mach 2)1,534.54101,387,424.00
New Horizons Probe33,0004,714,638.00
Speed of Light670,616,629.00232.00

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 93 Leonis Facts and Figures

Visual Facts


Primary / Proper / Traditional Name93 Leonis
Alternative NamesHD 102509, HIP 57565, HR 4527, 93 Leo, BD+21 2358
Spectral TypeA comp SB
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeStar
ColourBlue
GalaxyMilky Way
ConstellationLeo
Absolute Magnitude 0.31 / 0.24
Visual / Apparent Magnitude4.50
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)11h 47m 59.23
Declination (Dec.)+20° 13` 08.2
Galactic Latitude73.93 degrees
Galactic Longitude235.00 degrees
1997 Distance from Earth14.40 Parallax (milliarcseconds)
 226 Light Years
 69 Parsecs
2007 Distance from Earth14.02 Parallax (milliarcseconds)
 232 Light Years
 71 Parsecs
 14,644,699.20 Astronomical Units
Galacto-Centric Distance24,175.23 Light Years / 7,412.00 Parsecs
Proper Motion Dec.-4.34 ± 0.13 milliarcseconds/year
Proper Motion RA.-145.49 ± 0.23 milliarcseconds/year
B-V Index0.54
Radial Velocity0.50 ± 0.21 km/s
Eccentricity0.15
Inclination50.10
Semi-Major Axis6993.00
Stellar Luminosity (Lsun)70.83
Orbital Period (Days)71.69
Argument Of Periastron0.00

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)7.70
Effective Temperature6,016 Kelvin

Sources and Links


SIMBAD SourceLink

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
102509+21 2358.0A4.50000-150.00000-8.00000F8Yellow/White
+21 2357.0B9.60000-142.00000-4.000001836

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