Draft:AAVSO Photometric All-Sky Survey (APASS)
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The AAVSO Photometric All-Sky Survey is an optical and near-infrared all-sky astronomical survey that measures the brightnesses of stars in eight photometric passbands in the 7th to 17th magnitude range. The passbands employed are B and V from the Johnson UBV photometric system and u', g', r', i', z_s and Z from the Sloan Digital Sky Survey. The survey began as a BVg'r'i survey in the 10th to 17th magnitude range  but a later extension to brighter stars included the z_s and Z filters. 
The survey is conducted from two locations (New Mexico, USA and [[Cerro Tololo Inter-American Observatory] in Chile). Each site has identical equipment that consists of two 20cm diameter Astro Systeme Austria N8 astrographs equipped with Apogee U16m cameras. The two astrographs are on a Paramount ME German equatorial mount.
- Henden, Arne A., Welch, D.L., Terrell, D., & Levine, S.E. (2009). "The AAVSO Photometric All-Sky Survey (APASS)". American Astronomical Society Meeting Abstracts. 214: 407.02. Bibcode:2009AAS...21440702H.CS1 maint: Multiple names: authors list (link)
- Henden, Arne A., Levine, Stephen, Terrell, Dirk, Welch, Douglas L., Munari, Ulisse, & Kloppenborg, Brian K. (2018). "APASS Data Release 10". American Astronomical Society Meeting Abstracts. 232: 223.06. Bibcode:2018AAS...23222306H.CS1 maint: Multiple names: authors list (link)