The Kunkel & Rydgren BVri system

Basic Reference

Kunkel W.E., Rydgren A.E. 1979, Astron. J. 84, 633


Forty-eight of the Landolt [Astron. J. 78, 959 (1973)] faint equatorial standard stars have been observed with both S-1 and RCA 31034A photmultipliers. V-R and V-I colors are given for these stars on the Johnson system and on a system natural to the RCA 31034A.

A number of M dwarfs have also been observed with the S-1 and/or the RCA 31034A photomultipliers. Serious problems have been encountered in transforming the observed V-R and V-I colors of the M dwarfs to the johnson system.


Access to the data and references

Asiago Database on Photometric System (ADPS)

Indices and Parameters

V, U-B, B-V, V-r, V-i



RCA 31034A


To Johnson VRI colours:

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Last update: 13 September 2002