Comets

Comet Ephemerides

Comets & Meteor Showers

Central Bureau for Astronomical Telegrams

Sky and Telescope's Comet Page

Comet Observers' Forum

Asteroids and Comets

Deep Sky

CCD Images of Messier Objects

Messier Objects with Data

Comets & Meteor Showers - Gary Kronk

The International Meteor Organization

Sky & Telescope's Meteor Page

Occultation Section

ROYAL ASTRONOMICAL SOCIETY OF NEW ZEALAND OCCULTATION SECTION

International Occultation and Timing Association

Sky & Telescope's Occultation Page
 

 The American Association of Variable Star Observers (AAVSO)

VSNET - International V.S. Mailing Lists

Sky & Telescope - Variable Stars

 ASSA Variable Star Group