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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. UBV Photoelectric Photometry Catalogue, or UBV M is the star brightness catalogue comply to UBV photometric system, developed by Johnson. The UBV catalog data format is plain text, after uncompressing by unzip or gunzip it can be seen by any text viewers or by online ADC viewer. Specifications for catalog format are provided on the download sites. The early edition of 1968 by Blanco, sometimes referred as simply "Photoelectric catalogue" or UBV was replaced by Mermilliod edition UBV M in 1987 and extended in 1993. As atmospheric extinction problem associated with UBV photometric system become evidient, UBV Photoelectric Photometry Catalogue was phased-out in 2000 AD.