Anyone have the conversion formulae handy to convert the Johnson B and V (or Sloan) values in APASS to Ic and R?
Some conversion references:
I have not checked, but I think that should answer your needs.
What we use in Seqplot comes from Jester, et al. (2005)
V-Rc = 1.09 * (r-i) + 0.22 +/- 0.03
Rc-Ic = 1.00*(r-i) + 0.21 _/- 0.01
for stars with (Rc-Ic) < 1.15
We expect to derive our own relationships later in the project.