SkyServer: GLossary

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Primary The "main" observation of an object. Because there are overlaps at many levels of the imaging (runs, stripes), an object may be observed two or more times. Whether or not a specific observation of an object is the primary is decided when chunks are resolved. Whether an object is primary or not depends on a large number of factors.

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Primary	The "main" observation of an object. Because there are overlaps at many levels of the imaging (runs, stripes), an object may be observed two or more times. Whether or not a specific observation of an object is the primary is decided when chunks are resolved. Whether an object is primary or not depends on a large number of factors.