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Minor Planet Observer (Popularity:  )
http://www.minorplanetobserver.com/
Lightcurve collaboration, physical studies, software, Palmer Divide Observatory.
Category:
Science - Astronomy - Solar System - Asteroids, Comets and Meteors
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Arkansas Sky Observatory (Popularity: )
http://www.arksky.org
Comet and minor planet astrometry and photometry, including NEO's and PHA's.
Category:
Science - Astronomy - Solar System - Asteroids, Comets and Meteors
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Sloan Digital Sky Survey (Popularity: )
http://www.sdss.org/
A survey that maps one-quarter of the entire sky, determining the positions and absolute brightnesses of more than 100 million celestial objects.
Category:
Science - Astronomy - Data Archives
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Sloan Digital Sky Survey (Popularity: )
http://www.sdss.org/
Data links, questions and answers, image gallery, project tour, news, archive, publications, and links.
Category:
Science - Astronomy - Institutions - Observatories
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The SpaceGuard UK Portal (Popularity: )
http://www.spaceguarduk.com/
National focus in the UK for studies into the threat posed to the Earth by collisions with asteroids and comets.
Category:
Society - Issues - Warfare and Conflict - Planetary Defense
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Spaceguard UK (Popularity: )
http://www.spaceguarduk.com/
National United Kingdom information service to raise public awareness of the Near Earth Object threat, and technology available to predict and avoid dangerous impacts; and to promote research into the above.
Category:
Society - Future - Catastrophes - Large Near Earth Object Impacts
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Astronomical Institute of Saint Petersburg University (Popularity: )
http://www.astro.spbu.ru/
The institute is located in Perodvorets (near St.Petersburg).
Category:
Reference - Education - Colleges and Universities - Europe
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