The UBV Photoelectric Photometry Catalogue, or UBV M, is the star brightness catalogue that complies to the UBV photometric system

UBV photometric system

UBV photometric system, also called the Johnson system , is a wide band photometric system for classifying stars according to their colors. It is the first known standardized photoelectric photometric system. The letters U, B, and V stand for ultraviolet, blue, and visual magnitudes, which are...

 developed by astronomer Harold Johnson

Harold Johnson (astronomer)

Harold Lester Johnson was an American astronomer.Johnson was awarded the Helen B. Warner Prize by the American Astronomical Society in 1956...

.

Evolution of the UBV Photoelectric Photometry Catalogue

The early edition of 1968 by Blanco, sometimes referred as simply the "Photoelectric Catalogue" or UBV was replaced by the Mermilliod edition UBV M in 1987 and extended in 1993.
As the atmospheric extinction problem associated with the UBV photometric system

UBV photometric system

UBV photometric system, also called the Johnson system , is a wide band photometric system for classifying stars according to their colors. It is the first known standardized photoelectric photometric system. The letters U, B, and V stand for ultraviolet, blue, and visual magnitudes, which are...

 became evidient, the UBV Photoelectric Photometry Catalogue was phased-out in 2000.

Download locations

The UBV catalog data format is in plain text. After uncompressing by unzip or gunzip it can be seen by any text viewers or by the online ADC viewer. Specifications for the catalog format are provided at the download sites.

• Original catalogue data, 1953-1985, 109293 objects (alternative reference is Mermilliod, 1987)
• Catalogue extension, 1986-1992, 25639 objects
• Alternative download site for catalogue extension, 1986-1992, 25639 objects