u8508_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---1.31, 1.13, 1.06
Integration time (s)---1800, 1800, 1200
Pixel scale (arcsec)---1.134, 1.134, 1.134

# Thu 17:22:21 30-May-2002
begin BFIT
status 0 (Solution converged)
variance 2.919443E-4
stdeviation 0.01708638
avsqerror 2.934487E-4
averror 0.01713034
avsqscatter 9.893559E-5
avscatter 0.009946637
chisqr 0.9948735
msq 2.822128E-4
rms 0.01679919
reference m1
fitting (BV+V)+b1+b2*X1+b3*BV+b4*BV*X1
weights photometric
parameters 4
b1 (constant)
b2 (fit)
b3 (constant)
b4 (constant)
derivatives 4
0.1
0.1
0.1
0.1
values 4
3.434
0.3398903
-0.0157
0.
errors 4
0.
0.002096669
0.
0.

# Thu 17:23:06 30-May-2002
begin VFIT
status 0 (Solution converged)
variance 3.533681E-4
stdeviation 0.01879809
avsqerror 3.510584E-4
averror 0.01873655
avsqscatter 1.724228E-4
avscatter 0.01313099
chisqr 1.006579
msq 3.402804E-4
rms 0.01844669
reference m2
fitting V+v1+v2*X2+v3*BV+v4*BV*X2
weights photometric
parameters 4
v1 (constant)
v2 (fit)
v3 (constant)
v4 (constant)
derivatives 4
0.1
0.1
0.1
0.1
values 4
3.009
0.2183592
0.0415
0.
errors 4
0.
0.002304921
0.
0.

# Thu 14:43:59 11-Jul-2002
begin UFIT
status 0 (Solution converged)
variance 0.008117666
stdeviation 0.09009809
avsqerror 0.01131639
averror 0.1063785
avsqscatter 0.01121088
avscatter 0.1058815
chisqr 0.7173374
msq 0.007779431
rms 0.08820108
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
5.065
0.514
-0.146
0.
errors 4
0.006
0.
0.
0.

Connect with NRAO

The NSF National Radio Astronomy Observatory and NSF Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NSF NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NSF NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NSF NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NSF NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

The U.S. National Science Foundation (U.S. NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."

AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.