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Ad Leonis

Ad Leonis Facts

Ad Leonis's Alternative Names

Ad Leonis has alternative name(s) :- Ad Leo.

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

Location of Ad Leonis

The location of the main sequence 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 Ad Leonis, the location is 10h 19m 36.281 and +19° 52` 12.13 .

Radial Velocity and Proper Motion of Ad 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 -42.80 milliarcseconds/year towards the north and -501.80 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 12.50 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.

Physical Properties (Colour) of Ad Leonis

Ad Leonis Colour and Temperature

Ad Leonis has a spectral type of M4Vae C. This means the star is a red main sequence star.

Distance to Ad Leonis

The Parallax of the star is given as 204.60 which gives a calculated distance to Ad Leonis of 15.94 light years from the Earth or 4.89 parsecs. It would take a spaceship travelling at the speed of light, 15.94 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 1,008,627.87 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.

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Additional Ad Leonis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAd Leonis
Alternative NamesAd Leo
Spectral TypeM4Vae C
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourRed
GalaxyMilky Way
ConstellationLeo
Right Ascension (R.A.)10h 19m 36.281
Declination (Dec.)+19° 52` 12.13
Distance from Earth204.60 Parallax (milliarcseconds)
 15.94 Light Years
 4.89 Parsecs
 1,008,627.87 Astronomical Units
Proper Motion Dec.-42.80 milliarcseconds/year
Proper Motion RA.-501.80 milliarcseconds/year
Radial Velocity12.50 km/s
Associated / Clustered StarsAlgieba
Algieba B

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=ad%20leonis

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