d210_ubvcalib.txt
The following calibration format can be used directly in
IRAF.digiphot.photcal.invertfit. The instrumental magnitudes
mU, mB, and mV are -2.5*log(counts/s)+25.
For the these images, the average parameters for UBV are the following:
Airmass---1.51, 1.49, 1.48
Integration time (s)---600, 500, 200
Pixel scale (arcsec)---0.27, 0.27, 0.27
begin UFIT
status 0
parameters 2
u1
u2
derivatives 2
0.1
0.1
values 2
2.157223
-0.1136566
errors 2
0.0054008
0.01313
begin BFIT
status 0
parameters 2
b1
b2
derivatives 2
0.1
0.1
values 2
0.079320
-0.12177
errors 2
0.014319
0.01818
begin VFIT
status 0
parameters 2
v1
v2
derivatives 2
0.1
0.1
values 2
-0.05303964
0.02208642
errors 2
0.0114193
0.014448
