Charge-Coupled Device

With web-based star catalogues and other Internet and electronic resources, such as the Hubble Guide Star Catalog and the Lowell Observatory Asteroid Database, professional and amateur astronomers have begun sharing resources and comparing data in hopes of creating a more accurate and complete picture of the heavens. Organizations such as the Amateur Sky Survey help individuals coordinate and share data with others. Thanks to CCDs, amateurs have often contributed as significantly to these projects as professional astronomers have. Paul Comba, an amateur based in Arizona, discovered and registered some 300 previously unknown asteroids in 1996–97, after adding a digital camera to his telescope. In 1998, astrophysics student Gianluca Masi recorded the existence of an unknown variable star, discovered with the use of his Kodak KAF-0400 CCD, mounted in a Santa Barbara Instrument Group ST-7 camera. CCDs help level the playing field in the science of astrometry, drastically reducing the equipment barrier between the amateur and the professional.