•In parallel, other
workers defined the red bands:
–First defined in 1951,
principally due to the work of Kron.
–A new R filter was defined in 1951 by Lynn Smith (1951, PASP, 63, 91).
–Johnson attempted to define an
alternative system in 1966, but it was little accepted.
–The current system was defined by Cousins (1976, MNRAS, 81, 25). This gave rise to the current Kron-Cousins system in
RI.
–The system that all astronomers
use, amateur, professional, visual, or CCD is thus... “Johnson-Kron-Cousins”.
–This system was the result of more than 30 years of work.
UBV
RI
Bringing it up to
date...