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93 Leonis, HD102509, HIP57565, HR4527

93 Leonis is a blue star that can be located in the constellation of Leo. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

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.

Location of 93 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 93 Leonis, the location is 11h 47m 59.23 and +20d 13` 08.2 .

Proper Motion of 93 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 -4.34 ± 0.13 miliarcseconds/year towards the north and -145.49 ± 0.23 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 0.50000 km/s with an error of about 0.21 km/s .

Physical Properties (Colour, Temperature, Radius) of 93 Leonis

93 Leonis has a spectral type of A comp SB. This means the star is a blue star. The star is 7412.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24175.2270572800000000s. 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 has been calculated as being 7.52 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,233,224.04.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 7.73. 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 0.29 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.23. 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 226.50 light years away from Earth or 69.44 parsecs. It would take a spaceship travelling at the speed of light, 226.50 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 14.02 which put 93 Leonis at a distance of 232.64 light years or 71.33 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 7,412.00 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*.

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.

93 Leonis Facts

Alternative Names

Traditional/Proper Name93 Leonis
Flamsteed Name93 Leonis
Flamsteed Short Name93 Leo
Hipparcos Library I.D.57565
Yale Bright Star Catalogue (HR) Id4527
Bonner DurchmusterungBD+21 2358
Henry Draper Designation102509

Visual Facts

Star Type star
Absolute Magnitude0.29 / 0.23
Visual / Apparent Magnitude4.50
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)11h 47m 59.23
Declination (Dec.)+20d 13` 08.2
Galactic Latitude73.93 degrees
Galactic Longitude235.00 degrees
1997 Distance from Earth14.40 Parallax (milliarcseconds)
 226.50 Light Years
 69.44 Parsecs
2007 Revised Distance from Earth14.02 Parallax (milliarcseconds)
 232.64 Light Years
 71.33 Parsecs
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
Semi-Major Axis0.76
Orbital Period (Days)71.69
Argument Of Periastron0.00
Spectral TypeA comp SB
Colour(A) blue

Estimated Facts

Calculated Effective Temperature6,016 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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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