d210_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---1.51, 1.49, 1.48
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
2.157223
-0.1136566
errors 2
0.0054008
0.01313

begin BFIT
status 0
parameters 2
b1
b2
derivatives 2
0.1
0.1
values 2
0.079320
-0.12177
errors 2
0.014319
0.01818

begin VFIT
status 0
parameters 2
v1
v2
derivatives 2
0.1
0.1
values 2
-0.05303964
0.02208642
errors 2
0.0114193
0.014448

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.

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.