Asteroid Impact Threat (41/0)

German Comet Section

http://www.fg-kometen.de/fgk_hpe.htm - Details

Gary Kronk's Comet Page

http://cometography.com/ - Details

SkyHound Guide For Comets
Contains...
http://www.skyhound.com/sh/skyhound.html - Details

COMET SKETCHES BY BILL GREER

http://www.rangeweb.net/~sketcher/comets.html - Details

Minor Planet Centre
We are the official body that deals with astrometric observations and orbits of minor planets (asteroids) and comets.
http://cfa-www.harvard.edu/iau/mpc.html - Details

Groningen Comet Finder Charts

http://www.shopplaza.nl/astro/comets/comets.htm - Details

Alan Hale's Comet Page - Countdown To 500 Comets.

http://www.earthriseinstitute.org/comets.html - Details

CBAT
Made an astronomical discovery? Report it to the International Astronomical Union here!
http://cfa-www.harvard.edu/iau/cbat.html - Details

Observable Comets from The MPC

http://cfa-www.harvard.edu/iau/Ephemerides/Comets/ - Details

Sebastian Hoeing's Comet Page

http://www.sungrazer.org/ - Details

COMET CCD IMAGES

http://www.schursastrophotography.com/ccdcomets.html - Details

Comet Magnitude Estimates By John E.Bortle

http://skytonight.com/observing/objects/comets/3304211.html - Details

Seiichi Yoshida's Comet Page

http://www.aerith.net/ - Details

Tsutomu Seki's Comet Page

http://www.comet-web.net/~tsutomu-seki/ - Details

JPL Small Bodies Data Centre
This site provides information related to the orbits, physical charateristics, and discovery circumstances for most known natural bodies in orbit around our sun.
http://ssd.jpl.nasa.gov/ - Details

ICQ

http://cfa-www.harvard.edu/icq/icq.html - Details

Secrets Of High Power Comet Observing By Stephen James O'Meara

http://skytonight.com/observing/objects/comets/3304141.html - Details

BAA Comet Section

http://www.ast.cam.ac.uk/~jds/ - Details