Accuracy of JPL Horizons Ephemeris

On 25 Jan 2007 06:54:42 -0800, "Matt" wrote:

Hey guys. Just a quick question:

In arcseconds, typically how accurate is the JPL Horizons Ephemeris
system for main belt asteroids?

The generator has sub-arcsecond accuracy. The actual results will depend
on the accuracy of the elements, which certainly vary. However, one of
the terms the generator can produce is the statistical position error.
All of this is discussed in the documentation. See especially
http://ssd.jpl.nasa.gov/?horizons_doc#limitations .

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Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com