Astronomy: Associations

Established 1899, AAS is the major professional organization in North America for astronomers, other scientists and individuals interested in astronomy.

founded in 1919, has a mission to promote and safeguard the science of astronomy in all its aspects through international cooperation. With now over 8,300 individual members and 60 Adhering Countries worldwide, the IAU plays a key role in promoting and coordinating worldwide cooperation in astronomy. The IAU is also the sole internationally recognised authority for assigning designations to celestial bodies and surface features on such bodies.

was established to encourage and facilitate the observation of occultations and eclipses. It provides predictions for grazing occultations of stars by the Moon and predictions for occultations of stars by asteroids and planets, information on observing equipment and techniques, and reports to the members of observations made.

a non-profit organization dedicated to being a catalyst and information source for all those interested in research and education using relatively small astronomical telescopes.

is composed of over two hundred local amateur astronomical societies from all across the United States. Find out about our GREAT national conventions (ALCons)! Member Societies, Regions, Astronomy Day, Awards.

Professional and Amateur collection, research, and analysis of variable star observations.

A nonprofit organization that promotes exploration of the solar system and the search for extraterrestrial intelligence.

Key activities include research and observing planets, stars, celestial phenomena and the abatement of light pollution.

Member information, meeting announcements, publications and reports, awards, and links to related sites.

Promotes international interdisciplinary programs in solar-terrestrial physics, and organizes and coordinates such programs. Site has a newsletter, meetings and events, member directory, announcements, and links to related groups.

Works to maintain the International Celestial Reference System and Frame, and the International Terrestrial Reference System and Frame, and to provide timely and accurate data on the Earth's orientation for current use and long-term studies. Site describes the group's structure and function.

Disseminates astronomical information. The ASP has become the largest general astronomy society in the world, with members from over 70 nations.

An international organization of colleagues interested in antique astronomical telescopes, books, binoculars, and related materials.