The following graph shows Landolt's V-R versus B-V.
This figure shows V-R versus B-V for all Landolt stars having BVRI measurements. The solid line is an empirical fit and the dashed line is the simple equation: V-R = 0.01 + 0.57 * (B-V)
This site opened: March 29, 2005. Last Update: March 29, 2005