Universe Guide
HomeAliensConstellationsTelevision and Films ListFact ListGames ListWarcraftSearchTwitterFacebookComments

FK Leonis

FK Leonis Facts

FK Leonis's Alternative Names

HIP54711 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD97306.

FK Leonis has alternative name(s) :- FK Leo, FK 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+15 2302.

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

Location of FK 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 FK Leonis, the location is 11h 12m 05.52 and +14° 18` 22.8 .

Proper Motion of FK 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 -62.40 ± 0.61 miliarcseconds/year towards the north and 47.75 ± 0.96 miliarcseconds/year east if we saw them in the horizon. . 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.

FK 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 5.16 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 FK Leonis

FK Leonis has a spectral type of F5III. This means the star is a blue to white giant star. The star is 7,431.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,237.20 s. The star has a B-V Colour Index of 0.46 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,456 Kelvin.

FK Leonis Radius has been calculated as being 2.08 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,450,219.01.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 1.87. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FK Leonis Apparent and Absolute Magnitudes

FK Leonis has an apparent magnitude of 8.50 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 2.77 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.01. 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 FK Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.13 which gave the calculated distance to FK Leonis as 457.45 light years away from Earth or 140.25 parsecs. It would take a spaceship travelling at the speed of light, 457.45 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 7.97 which put FK Leonis at a distance of 409.24 light years or 125.47 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 25,879,864.91 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 7,431.00 Parsecs or 24,237.20 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of FK Leonis

The star is a eclipsing binary sys Beta Persei (Algol) 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. FK Leonis brightness ranges from a magnitude of 8.850 to a magnitude of 8.590 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.7 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.

Hide Explanations
Show GridLines

Additional FK Leonis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameFK Leonis
Alternative NamesFK Leo, HD 97306, HIP 54711, BD+15 2302, FK Leo
Spectral TypeF5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourYellow - White
GalaxyMilky Way
ConstellationLeo
Absolute Magnitude 2.77 / 3.01
Visual / Apparent Magnitude8.50
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)11h 12m 05.52
Declination (Dec.)+14° 18` 22.8
Galactic Latitude63.55 degrees
Galactic Longitude236.91 degrees
1997 Distance from Earth7.13 Parallax (milliarcseconds)
 457.45 Light Years
 140.25 Parsecs
2007 Distance from Earth7.97 Parallax (milliarcseconds)
 409.24 Light Years
 125.47 Parsecs
 25,879,864.91 Astronomical Units
Galacto-Centric Distance24,237.20 Light Years / 7,431.00 Parsecs
Proper Motion Dec.-62.40 ± 0.61 milliarcseconds/year
Proper Motion RA.47.75 ± 0.96 milliarcseconds/year
B-V Index0.46
Stellar Luminosity (Lsun)5.16

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Persei (Algol)
Mean Variability Period in Days1.737
Variable Magnitude Range (Brighter - Dimmer)8.590 - 8.850

Estimated Calculated Facts


Radius (x the Sun)1.87
Effective Temperature6,456 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

   
x
This website is using cookies. More info. That's Fine