Table 1 presents orbital elements: a: semimajor axis, e: eccentricity, i: inclination, [OMEGA]: longitude of the ascending node, [omega]: argument of perihelion, and M: mean anomaly The orbits are computed from 569 astrometric positions
from which 8 observations were rejected as outliers, and also on 29 radar observations with 4 observations rejected as outliers.
In response, eight astrometric positions
were forthcoming for June 26 to July 1, the last measures being obtained by Ernesto Guido and Nick Howes using the remotely operated 2.0m Faulkes Telescope South (FTS) at Siding Spring, Australia.
Astronomers derived a reasonable orbit for minor planet 2060 Chiron, the first Centaur, soon after discovery by taking advantage of decades of astrometric positions
waiting on the plates.
I imaged it from 20:51-23:25 UTC using a 0.28m, f/10 SCT and ST9XE CCD camera, and provided astrometry to the Minor Planet Center in time for my data to be used along with astrometric positions
provided by several other observatories to fine-tune the orbit so that a Minor Planet Electronic Circular (MPEC) could be issued.
Like several other programs in the field, Canopus can take the user from the beginning to the end, right up to e-mailing the astrometric positions
, in a simple, methodical fashion.
Woolston was the main source of astrometric cometary positions from Great Britain for decades, at a time when everything about astrometry was hard, from guiding the telescope by hand with slow motions operated by ropes, taking photographs on glass plates, measuring with a small mechanical measuring machine and working out astrometric positions
on a hand-cranked adding machine.
These stars are all brighter than 11th magnitude and have excellent astrometric positions
and proper motions as measured by the Tycho and Hipparcos missions.
Since switching from film to CCD images, Raab and his friends have submitted more than 2,000 astrometric positions
to the MPC, and discovered almost 30 new asteroids.