The following comets are in great need of observation, both photometric and astrometric -- some having not been observed to our knowledge in quite some time (despite predictions placing them brighter than total magnitude 21), while others have been observed well astrometrically but either (a) very poorly photometrically or (b) the light curve is uncertain (or developing strangely), so that careful total-magnitude photometry is very much desired. Observers are encouraged to send both photometry and astrometry to firstname.lastname@example.org (with copies of all astrometry *also* to email@example.com).
Even negative observations (where the comet was not detected) are highly useful and should be reported; such reports should include the date (decimal date UT), the limiting stellar magnitude (with bandpass), full instrumentation details (including exposure duration), the amount of sky covered on each side of the line-of-variation (with reference given to where the utilized orbital elements and/or ephemeris were published, along with mention as to whether a "perturbed" ephemeris was used or not).
Comets in need of astrometry and total-magnitude photometry:
The following comets are not in need of astrometry so much as they are in need of total-magnitude photometry and morphological measurements (coma diameter, tail length and p.a.):
[last updated 9/25/10]