To update the orbital elements for comets I go to
www.harvard.edu/iau/Ephemerides/Comets/SoftwareComets.html
For Orbital Elements: Observable Unusual Minor Planets I follow
http://cfa-www.harvard.edu/iau/Ephemerides/Unusual/SoftwareUnusual.html
One set I have never updated is for the numbered asteroids. Can
someone give me a link for these to update Guide 8? Mike H.