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Field recommendation for color transforms?

roe's picture
roe
Online
Joined: 2010-07-25

I've always used M67 or NGC 7790 as a standard field for determining color transforms.  It seems we are currently in no-mans land for these two.  Is there another field(s) that anyone  could recommend for imaging these short days of summer (with VPHOT sequence available)?

Jim Roe [ROE]

field calibration
HQA's picture
HQA
Offline
Joined: 2010-05-10

Hi Jim,

The other cluster that I was calibrating was M11, where I had 6 UBVRI calibrated nights before I left Flagstaff.  That data is probably in Seqplot.  In addition, the field of SA110-503 and its neighbors is extremely well calibrated and is a good choice instead of a cluster.  I have ~22 nights of data for it, also in Seqplot.

Arne

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