Skip to main content

Transforming Rc band data

Due to the New England winter storm currently affecting the area, phone coverage at the AAVSO may be much reduced until Wednesday. The staff is still available via email, and we suggest using that method to contact us if you need assistance.
mrv's picture
Joined: 2010-12-21

I've been formatting my photometry spreadsheets to fully transform my differential B,V,Rc,Ic photometry onto the standard system. Using Gordon Sarty's useful paper, I was able to do this for B,V and Ic. I'm a little unsure about how to handle the Rc data. Some years ago, Arne recommended determining Tr vs. V-Ic instead of V-Rc. So when I calculated my Tr coefficient, I did it vs. V-Ic. In Gordon's paper, he shows examples of R mags transformed using Tvr or Tri, but not Tvi. How do I transform my Rc data using Tvi? Do I still need Tvr to first calculate the standard color or can I use Tvi for the Rc data? Thanks, Bob

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484