d70_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---1.15, 1.19, 1.44
Integration time (s)---1800, 2700, 1200
Pixel scale (arcsec)---1.134, 1.134, 1.134
begin BFIT
status 0
parameters 2
b1
b2
derivatives 2
0.1
0.1
values 2
3.918024
-0.0270041
errors 2
0.00008
0.00009
begin VFIT
status 0
parameters 2
v1
v2
derivatives 2
0.1
0.1
values 2
3.273386
0.01715033
errors 2
0.0115
0.01237
# Thu 13:26:47 11-Jul-2002
begin UFIT
status 0 (Solution converged)
variance 0.00348023
stdeviation 0.05899347
avsqerror 0.003478821
averror 0.05898153
avsqscatter 0.002500445
avscatter 0.05000445
chisqr 1.000405
msq 0.003374769
rms 0.05809276
reference mU
fitting (UB+BV+V)+u1+u2*XU+u3*BV+u4*UB*XU
weights photometric
parameters 4
u1 (fit)
u2 (constant)
u3 (constant)
u4 (constant)
derivatives 4
0.1
0.1
0.1
0.1
values 4
5.267
0.453
-0.125
0.
errors 4
0.01
0.
0.
0.
