sagdig_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---1.65, 1.65, 1.68
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
2.197749
-0.128126
errors 2
0.003785
0.009613
begin BFIT
status 0
parameters 2
b1
b2
derivatives 2
0.1
0.1
values 2
0.0482687
-0.05287
errors 2
0.02294
0.0282
begin VFIT
status 0
parameters 2
v1
v2
derivatives 2
0.1
0.1
values 2
-0.117043
0.06056194
errors 2
0.00857
0.0106
