Links

Minor Planet & Comet Ephemeris Service
http://www.cfa.harvard.edu/iau/MPEph/MPEph.html

Asteroids - Dynamic Site
http://hamilton.dm.unipi.it/astdys/

Minor Planet Checker
http://scully.cfa.harvard.edu/~cgi/CheckMP

NEO & Comet Checker
http://scully.cfa.harvard.edu/~cgi/CheckNEOCMT

Unnumbered periodic comets index
http://jcometobs.web.fc2.com/punnum.htm

Minor Planet Normal Positions Service for Astrometry
http://www.cfa.harvard.edu/iau/VideoObs/VideoNormalPlaces.html

International Occultation Timing Association (IOTA)
http://www.lunar-occultations.com/iota/iotandx.htm

Occultation Section of the Royal Astronomical Society of New Zealand
http://occsec.wellington.net.nz/

SAO/NASA ADS Paper Search Engine
http://adsabs.harvard.edu/abstract_service.html