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  • The Planetary Society
  • planetary.org
  • A nonprofit organization devoted to the exploration of the solar system and the search for extraterrestrial life.
4.5
(1)
>690
7
  • The International Astronomical Union (IAU)
  • www.iau.org
  • Founded in 1919, has a mission to promote and safeguard the science of astronomy through international cooperation. The organization is also the internationally recognized authority for assigning designations to celestial bodies and surface features on such bodies.
4.3
(si*)
>10
8
  • American Astronomical Society (AAS)
  • www.aas.org
  • Established 1899, AAS is the major professional organization in North America for astronomers, other scientists and individuals interested in astronomy.
4.2
(si*)
>100
7
4.1
(si*)
>10
6
  • European Astronomical Society (EAS)
  • eas.unige.ch
  • An association founded under the Swiss Civil Code in 1990. Its purpose is to contribute to and promote the advancement of astronomy in Europe.
4.1
(si*)
-
6
  • International Earth Rotation Service (IERS)
  • hpiers.obspm.fr
  • 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.
4.1
(si*)
>20
6
4.0
(si*)
<5
6
3.9
(si*)
<10
7
  • International Occultation Timing Association (IOTA)
  • www.occultations.org
  • 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.
3.8
(si*)
<5
6
3.8
(si*)
>10
5
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