MBCAA Observatory
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Transformation coefficients: B, V measurementsObserved: 5 Jan 2005, 24 Dec 2006, 12 Jan, 9, 15, 20 Feb, 11, 14 March, 24 Apr 2007M. Bonnardeau
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Run | Session | Field | Nb of subfields |
Nb of stars |
B-V range | Tbv | Cbv | Tb | Cb | Tv | Cv |
0 | 20050107 | L95 | 3 | 13 | 1.852 | 1.008 | +0.012 | +0.008 | +0.024 | -0.010 | +0.021 |
1 | 20061224 | L98 | 1 | 8 | 1.121 | 1.075 | -0.054 | 0.042 | -0.050 | -0.026 | -0.002 |
2 | 20070112 | L95 | 2 | 9 | 1.208 | 1.017 | -0.027 | 0.008 | -0.010 | -0.007 | 0.017 |
3 | 20070209 | L95 | 2 | 9 | 0.640 | 1.006 | -0.022 | -0.021 | 0.013 | -0.040 | 0.049 |
4 | 20070215 | L95 | 2 | 9 | 0.640 | 1.057 | -0.059 | 0.023 | -0.032 | -0.037 | 0.026 |
5 | 20070215 | L104 | 1 | 7 | 0.775 | 1.091 | 0.003 | -0.008 | 0.032 | -0.052 | 0.007 |
6 | 20070220 | L98 | 1 | 7 | 1.121 | 1.031 | -0.023 | 0.010 | -0.020 | -0.018 | 0.000 |
7 | 20070311 | L98 | 1 | 8 | 1.121 | 1.017 | -0.010 | -0.024 | -0.000 | -0.035 | 0.005 |
8 | 20070314 | L98 | 1 | 8 | 1.121 | 1.031 | -0.029 | 0.018 | -0.032 | -0.014 | -0.002 |
9 | 20070424 | L104 | 1 | 5 | 0.811 | 0.918 | 0.046 | 0.052 | -0.072 | +0.093 | -0.099 |
10 | 20070424 | L101 | 1 | 5 | 0.584 | 0.903 | 0.142 | -0.124 | 0.193 | 0.006 | 0.009 |
11 | 20070424 | PG1323 | 1 | 4 | 0.847 | 0.998 | -0.001 | 0.023 | -0.012 | -0.004 | 0.002 |
The transformed magnitudes B,V are calculated the following way:
B = b+Tb*Tbv*[(b-v)-(Bc-Vc)]
V = B-[(Bc-Vc)+Tbv*[(b-v)-(Bc-Vc)]]
or
V = v+Tv*Tbv*[(b-v)-(Bc-Vc)]
B = V+[(Bc-Vc)+Tbv*[(b-v)-(Bc-Vc)]]
with Bc,Vc the magnitudes of the comparison star, b,v the measured magnitudes
of the star being studied. The only coefficients that are then useful
for the equations are Tbv, Tb*Tbv, Tv*Tbv:
The coefficients are fairly stable. The worst is for run 10 but this
is also the run with the smallest B-V range (the larger this range, the better
the coefficient determination is).
The average values and standard deviations are:
Tbv = 1.013 +/- 0.056
Tb*Tbv = 0.002 +/- 0.042
Tv*Tbv = -0.014 +/- 0.036
Telescope and camera configuration.
Computer and software configuration.
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