American Association of Variable Star Observers
Since its founding in 1911, the American Association of Variable Star Observers (AAVSO) has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and educators. These records establish light curves depicting the variation in brightness of a star over time.
Since professional astronomers do not have the time or the resources to monitor every variable star, astronomy is one of the few sciences where amateurs can make genuine contributions to scientific research. The AAVSO International Database currently has over 20 million variable star estimates dating back over 100 years. The 20-millionth observation was received into the database on February 19, 2011, during the AAVSO's 100th year of existence. It receives nearly 1,000,000 observations annually from around 2,000 professional and amateur observers and is quoted regularly in scientific journals.
The AAVSO is also very active in education and public outreach. They routinely hold training workshops for citizen science and publish papers with amateurs as coauthors. In the 1990s, the AAVSO developed the Hands-On Astrophysics curriculum, now known as Variable Star Astronomy (with support from the National Science Foundation (NSF)). In 2009, the AAVSO was awarded a three-year $800,000 grant from the NSF to run Citizen Sky, a pro-am collaboration project based around the 2009-2011 eclipse of the star epsilon Aurigae.
The AAVSO headquarters were originally located at the residence of its founder William T. Olcott in Norwich, Connecticut. After AAVSO's incorporation in 1918 it de facto moved to Harvard College Observatory, which later officially provided an office as the AAVSO headquarters (1931–1953). After then it moved around Cambridge before purchasing their first building in 1985 - The Clinton B. Ford Astronomical Data and Research Center. In 2007, the AAVSO purchased and moved into the recently vacated premises of Sky & Telescope magazine.
Current and former members
The AAVSO currently has over 2,000 members and observers, with approximately half of them from outside the United States. This list only consists of those with Wikipedia pages.
- Leah B. Allen Charter Member 
- Joseph Ashbrook
- Leon Campbell (AAVSO Director 1915-1949)
- Radha Gobinda Chandra
- Robert Evans (AAVSO Supernova Search Committee Chairperson 1985-2005)
- Clinton B. Ford
- Russell Merle Genet
- Pamela L. Gay
- Edward A. Halbach
- Arne Henden (AAVSO Director 2004- )
- Richard Huziak
- Albert F. A. L. Jones
- Michael Koppelman
- Giovanni B. Lacchini
- Helen Lines
- Richard D. Lines
- Janet A. Mattei (AAVSO Director 1973-2004)
- Margaret Mayall (AAVSO Director 1949-1973)
- Ben Mayer
- Arto Oksanen
- William T. Olcott (Founder)
- M. Daniel Overbeek
- Leslie Peltier
- Edward C. Pickering
- Peter Francis Williams
- Saladyga, Michael (October 1999). "The "Pre-Embryonic" State of the AAVSO: Amateur Observers of Variable Stars in the United States From 1875 to 1911". The Journal of the American Association of Variable Star Observers 27 (2): 154–170. Bibcode:1999JAVSO..27..154S.
- Ferris, Timothy (2003). Seeing in the Dark: How Amateur Astronomers Are Discovering the Wonders of the Universe. Simon & Schuster. p. 54. ISBN 0-684-86580-7.
- "20 Million Observations by Amateur Astronomers". Universe Today. 2011-02-23. Retrieved 2011-05-16.
- Percy, John R.; Desjardins, Adrien; Yu, Lawrence; Landis, Howard J. (2002). "Small Amplitude Red Variables in the AAVSO Photoelectric Program: Light Curves and Periods". Publications of the Astronomical Society of the Pacific (PDFBibcode:1996PASP..108..139P. doi:10.1086/133703.) 108: 139.
- Cannizzo, John K. (2002). "The Accretion Disk Limit Cycle Model: Toward an Understanding of the Long-Term Behavior of SS Cygni". Astrophysical Journal (PDFBibcode:1993ApJ...419..318C. doi:10.1086/173486.) 419: 318.
- Kiss, L. L.; Szatmáry, K.; Cadmus, R. R., Jr.; Mattei, J. A. (June 1999). "Multiperiodicity in semiregular variables. I. General properties". Astronomy and Astrophysics (PDFarXiv:astro-ph/9904128. Bibcode:1999A&A...346..542K.) 346: 542–555.
- Variable Star Astronomy
- Citizen Sky
- Williams, Thomas R.; Willson, Lee Anne (December 2004). "Obituary: Janet Akyüz Mattei, 1943-2004". Bulletin of the American Astronomical Society 36 (5): 1681–1682. Bibcode:2004BAAS...36.1681W.
- Williams, Thomas R.; Saladyga, Michael (2011). Advancing Variable Star Astronomy - The Centennial History of the American Association of Variable Star Observers (1st ed.). Cambridge University Press. ISBN 978-0-521-51912-0.
- Clinton B. Ford Astronomical Data and Research Center
- "Minor Planets Circular 79711" (PDF). Minor Planet Center. May 1, 2003. Retrieved 2012-07-14.
- Dorrit Hoffleit "The Maria Mitchell Observatory:For Astronomical Research and Public Enlightenment" JAAVSO Volume 30, 2001, p70, AAVSO.org where her photograph from 1930 appears.
- AAVSO: Part Four: The AAVSO and International Cooperation
- AAVSO website
- History of the AAVSO
- Amateur Astronomy Reaches New Heights Space.com, June 28, 2000
- A New Foundation for the AAVSO article in January 2007 issue of Sky & Telescope magazine
- Red Hot News… Possible Nova in Sagittarius! Universe Today, August 9, 2009
- 100 Years of Citizen Science (1 December 2010)