In addition to Sky & Telescope, the following organizations will post AstroAlerts. To find out more about what they do, check out their Web sites using the links provided.
American Association of Variable Star Observers (AAVSO) is the largest organization of its kind, specializing in long-period and eruptive variable stars (www.aavso.org).
Association of Lunar and Planetary Observers (ALPO) studies all kinds of solar-system objects and phenomena, from the Sun to meteors (www.lpl.arizona.edu/alpo).
British Astronomical Association (BAA), the world’s most diverse amateur research organization, has sections dedicated to virtually all astronomical events (www.ast.cam.ac.uk/~baa).
Center for Backyard Astrophysics (CBA) specializes in professional-quality photometry campaigns involving cataclysmic variable stars (cba.phys.columbia.edu).
International Meteor Organization (IMO) is the dominant clearing-house for the study of particles that strike the Earth’s atmosphere (www.imo.net).
International Occultation Timing Association (IOTA) provides accurate predictions and professional analyses for lunar, planetary, and asteroid events (www.anomalies.com/iotaweb/index.htm).
Partners in Discovery, a NASA initiative, aims to involve amateur scientists in research arenas such as astrobiology and astronomy. It will contribute information about solar activity and astronomical happenings of interest to ham radio operators
Solar Terrestrial Dispatch (STD) provides information about the state of the Sun and its effects on Earth. STD also develops specialized computer software to monitor the Sun-Earth environment and predict changes in "space weather." (www.spacew.com).
SuperNova Early Warning System (SNEWS) is a creation of astronomers working with the world's major neutrino observatories. SNEWS hopes to provide early warning
of the next gravitational-collapse supernova in our galaxy, based on the coincidence of prompt neutrino signals from detectors around the globe (hep.bu.edu/~snnet).
The Amateur Sky Survey (TASS) aims to discover new objects and phenomena by keeping a large piece of sky under surveillance with CCD-equipped cameras (www.tass-survey.org/tass/tass.shtml).
The Astronomer is a monthly publication specializing in reporting auroras, meteors, lunar and planetary phenomena, solar activity, and variable stars (www.theastronomer.org).
VSNET is an international mailing list for variable star observers (www.kusastro.kyoto-u.ac.jp/vsnet).