viizw403_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---1.40, 1.49, 1.42
Integration time (s)---1800, 1800, 900
Pixel scale (arcsec)---0.61, 0.61, 0.61
# Wed 16:27:43 15-May-2002
begin BFIT
status 0 (Solution converged)
variance 0.002122746
stdeviation 0.04607327
avsqerror 1.
averror 1.
avsqscatter 0.
avscatter 0.
chisqr 0.002122746
msq 0.002037836
rms 0.04514239
reference mB
fitting (BV+V)+b1+b2*XB+b3*BV+b4*BV*XB
weights uniform
parameters 4
b1 (constant)
b2 (fit)
b3 (constant)
b4 (constant)
derivatives 4
0.1
0.1
0.1
0.1
values 4
1.74
0.3216127
0.061
0.
errors 4
0.
0.005664742
0.
0.
# Wed 16:28:32 15-May-2002
begin VFIT
status 0 (Solution converged)
variance 0.002959888
stdeviation 0.05440485
avsqerror 1.
averror 1.
avsqscatter 0.
avscatter 0.
chisqr 0.002959888
msq 0.002854177
rms 0.0534245
reference mV
fitting V+v1+v2*XV+v3*BV+v4*BV*XV
weights uniform
parameters 4
v1 (constant)
v2 (fit)
v3 (constant)
v4 (constant)
derivatives 4
0.1
0.1
0.1
0.1
values 4
1.532
0.2220432
0.0075
0.
errors 4
0.
0.006431384
0.
0.
# Thu 15:53:28 11-Jul-2002
begin UFIT
status 0 (Solution converged)
variance 0.002845645
stdeviation 0.05334459
avsqerror 0.002843805
averror 0.05332734
avsqscatter 0.0025803
avscatter 0.05079666
chisqr 1.000647
msq 0.002731819
rms 0.05226681
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
3.622
0.465
-0.15
0.
errors 4
0.005
0.
0.
0.
