General ephemerides of the solar system bodies

To observe the solar system bodies from the Earth at a given moment, it is necessary to know their positions on the celestial sphere. In a more general way, this implies to determine the considered body, Earth and Sun positions related to a given time. For that we use a planetary theories which provide (analytical or numerical) description of planets movement at the time of their revolution around the Sun.
In the same way there are natural satellites theories about their movements according to their central body. For the asteroids and other small bodies of the solar system, it is following a numerical integration of their movement that we can determine their orbit.

You can carry out calculations of positions ephemeris of any body of the solar system for one or more dates spread over an time span of which you will indicate the initial date, the number of dates and the step of calculation. The provided timescales are Terrestrial Time (TT) and the coordinated universal Time (UTC). The planetary theories suggested are upon choice INPOP [14], VSOP82 [2], DE200 [3], VSOP87 [4] and DE403 [5], DE405 and DE406 while natural satellites theories are NOE-MARS-06 [6] for Mars, L1 [7] for Jupiter, TASS 1.7 [8] for Saturn and GUST86 [9] for Uranus. For the Moon, the theory used is, according to case's, ELP2000-82 [13] or ELP2000-82B or LE200 [3] or LE403 [5] or LE405 or LE406.

Use Sources Bibliography Parameters Credit Copyright


Select the body
Sun Earth Moon

Planets and natural satellites

Upload a list of bodies:
or select a planet and one or more of its satellites :
Mars Phobos (M-1) Deimos (M-2)
Jupiter Io (J-1) Europa (J-2) Ganymede (J-3)
Callisto (J-4) Amalthea (J-5) Thebe (J-14)
Saturn Mimas (S-1) Enceladus (S-2) Tethys (S-3)
Dione; (S-4) Rhea (S-5) Titan (S-6)
Hyperion (S-7) Iapetus (S-8)
Uranus Miranda (U-5) Ariel (U-1) Umbriel (U-2)
Titania (U-3) Oberon (U-4)
Neptune Triton (N-1) Nereid (N-2) Naiade (N-3)
Thalassa (N-4) Despina (N-5) Galatea (N-6)
Larissa (N-7) Proteus (N-8)
Select the appropriate calculation :
planet alone satellite(s) alone planet and its satellites


asteroid's UAI number : (of 1 with ... (*))
or designation : (eg. Ceres or 1999_TC36)
(*) depends on the base update 'The Asteroid Orbital Elements Database of E. Bowell'.


Comet Comet list (ex. P/2007 N1 ou P/Borrelly ou 73P-C)
Planetary theories
DE405 / LE405 DE403 / LE403 DE406 / LE406
Reference center
heliocenter geocenter UAI Observatory code ? 
Other place :
Reference plan
equator ecliptic
Type of coordinates
spherical rectangular dedicated to the observation
local times dedicated to the observation OA
Type of ephemerides
astrometric J2000 Mean of the date
apparent (true equator ; équinox of the date) Mean J2000
UTC (Coordinated Universal Time) TT (Terrestrial time)
Time of calculations
  Upload a file of dates:
Year Month Day Hours Minutes Seconds

   Number of date :   (< 5001)
   Sampling step :   
   Format of the dates ::
   Format of the results :
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