Universe Guide

Ad Leonis

Ad Leonis Facts

  • Ad Leonis is a main sequence star that can be located in the constellation of Leo. The description is based on the spectral class.
  • Ad Leonis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M4Vae C) of the star, the star's colour is red .
  • The star is calculated at being about 15.94 light years away from us. Distance

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 12.50000 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 of Ad Leonis

Ad Leonis Temperature and Colour

Based on the star's spectral type of M4Vae C , Ad Leonis's colour and type is red main sequence star. Based on the star's spectral, the stars temperature is between 2,400.00 and 3,700.00 degrees kelvin.

Distance to Ad Leonis

The Parallax of the star is given as 204.60000 which gives a calculated distance to Ad Leonis of 15.94 light years from the Earth or 4.89 parsecs. It is about 93,705,288,448,547 miles from Earth.

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.

Travel Time to Ad 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 A38073614,523,952.54
Speed of Sound (Mach 1)767.26913,932,048.69
Concorde (Mach 2)1,534.546,966,015.27
New Horizons Probe33,000323,928.15
Speed of Light670,616,629.0015.94

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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
GalaxyMilky Way
Right Ascension (R.A.)10h 19m 36.281
Declination (Dec.)+19° 52` 12.13
Distance from Earth204.60000 Parallax (milliarcseconds)
 15.94 Light Years
 4.89 Parsecs
 1,008,627.87 Astronomical Units
Proper Motion Dec.-42.80000 milliarcseconds/year
Proper Motion RA.-501.80000 milliarcseconds/year
Radial Velocity12.50000 km/s
Associated / Clustered StarsAlgieba
Algieba B

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Calculated Temperature Range2,400.00 - 3,700.00

Sources and Links


List of Extrasolar Planets orbiting Ad Leonis

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
AD Leo bConfirmed2.2260.0320190.025

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