Universe Guide

FG Leonis

FG Leonis Facts

FG Leonis's Alternative Names

HIP54108 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD95960.

FG Leonis has alternative name(s) :- , FG 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+06 2397.

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

Location of FG Leonis

The location of the variable 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 FG Leonis, the location is 11h 04m 19.08 and +05° 13` 29.7 .

Physical Properties (Colour, Temperature) of FG Leonis

FG Leonis Colour and Temperature

FG Leonis has a spectral type of M.... This means the star is a red variable star. The star has a B-V Colour Index of 1.67 which means the star's temperature is about 3,562 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

FG Leonis Radius

Radius has been calculated as being 169.65 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 118,043,270.52.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

FG Leonis Apparent and Absolute Magnitudes

FG Leonis has an apparent magnitude of 7.84 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -4.20 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 FG Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.39 which gave the calculated distance to FG Leonis as 8363.16 light years away from Earth or 2564.10 parsecs. If you want that in miles, it is 5,608,474,166,988.

Travel Time to FG 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)
Airbus A3807367,620,209,466.02
Speed of Sound (Mach 1)767.2697,309,658,238.49
Concorde (Mach 2)1,534.543,654,824,355.82
New Horizons Probe33,000169,953,762.64
Speed of Light670,616,629.008,363.16

Variable Type of FG 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. FG Leonis brightness ranges from a magnitude of 8.013 to a magnitude of 7.840 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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 FG Leonis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameFG Leonis
Alternative NamesHD 95960, HIP 54108, BD+06 2397, FG Leo
Spectral TypeM...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Absolute Magnitude -4.20
Visual / Apparent Magnitude7.84
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)11h 04m 19.08
Declination (Dec.)+05° 13` 29.7
Galactic Latitude56.38 degrees
Galactic Longitude248.79 degrees
Distance from Earth0.39 Parallax (milliarcseconds)
 8363.16 Light Years
 2564.10 Parsecs
 528,879,904.41 Astronomical Units
B-V Index1.67
Radial Velocity35.20 ± 0.25 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 Days0.183
Variable Magnitude Range (Brighter - Dimmer)7.840 - 8.013

Estimated Calculated Facts

Radius (x the Sun)169.65
Effective Temperature3,562 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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