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Description : The Guide Star Photometric Catalog I (GSPC-I) is a all-sky catalog of secondary "standard-stars" that were used to perform the photometric calibration of the GSC-I. The GSPC-I consists of approximately 6 stars between 9-15th magnitude near the center of each of the Palomar and UKSTU survey fields. These were all observed using a photo-electric photometer. References : The
Guide Star Photometric Catalog I Properties : Data
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