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HORIZONS Time Spans Available

This page shows available HORIZONS ephemeris time spans for the group of bodies selected from the menu on the left. Data are available only for bodies accessible via HORIZONS. The time-spans available are shown below in the Barycentric Dynamical Time (TDB) scale (the uniform time scale and independent variable of the ephemerides), not UT.

Small-Bodies (asteroids/comets)

 Object   Available Time Span   Ephemeris File 
small-bodies  1599-Dec-12 to 2500-Dec-30   DE431 

All asteroid and comet ephemerides are numerically integrated with respect to JPL planetary ephemeris DE431 and thus limited to its available time span.

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