Asteroids
Contents
The asteroid positions in Solar Fire are calculated from ephemeris files. The main asteroids (Ceres, Pallas, Juno, Vesta) are available for the full range of the Swiss Ephemeris (2 Jan 5401 BC to 31 Dec 5399). The likely accuracy is a few arc seconds in 1600 AD and a few arc minutes in 3000 BC.
The supplied supplementary asteroids are also calculated from ephemerides supplied by Mark Pottenger, and cover the period 1900 to 2100 approximately.