The applicable transformation equations from the instrumental to the
standard UBVRI system are given by:
U-B = 0.992(U-B)
+ C
B-V = 1.170(B-V)
+ C
V-R = 0.995(V-R)
+ C
V-I = 1.150(V-I)
+ C
V = V
- 0.05(B-V
) + C
where the C
are the zero-points which are determined each night from
standard star observations.