d167_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---1.73, 1.485, 1.67
Integration time (s)---1800, 1200, 900
Pixel scale (arcsec)---1.134, 1.134, 1.134
begin UFIT
status 0
parameters 2
u1
u2
derivatives 2
0.1
0.1
values 2
5.7383
-0.04809
errors 2
0.067
0.089
begin BFIT
status 0
parameters 2
b1
b2
derivatives 2
0.1
0.1
values 2
3.8163
0.01101
errors 2
0.021
0.024
begin VFIT
status 0
parameters 2
v1
v2
derivatives 2
0.1
0.1
values 2
3.2426
0.05024
errors 2
0.016
0.021
