MBCAA Observatory
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Transformation coefficients: V, Rc measurementsObserved: 24 Dec 2006, 12 Jan, 19 July, 5 Aug, 5, 6, 12, 15 Sept 2007Michel Bonnardeau
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Run | Session | Field | Nb of stars |
V-Rc range |
Tvr | Cvr | Tv | Cv | Tr | Cr |
0 | 20061224 | L98 | 8 | 0.607 | 1.118 | -0.053 | -0.050 | 0.001 | -0.143 | 0.042 |
1 | 20070112 | L95 | 9 | 0.663 | 1.026 | -0.022 | -0.014 | 0.017 | -0.041 | 0.039 |
2 | 20070719 | L110 | 7 | 1.038 | 1.154 | -0.079 | 0.041 | -0.042 | -0.111 | 0.038 |
3 | 20070805 | L111 | 3 | 0.730 | 1.135 | -0.090 | -0.054 | 0.042 | -0.173 | 0.121 |
4 | 20070905 | L110 North | 8 | 1.038 | 1.105 | -0.054 | 0.004 | -0.010 | -0.107 | 0.049 |
5 | 20070905 | L110 South | 9 | 1.148 | 1.157 | -0.144 | 0.006 | -0.049 | -0.145 | 0.084 |
6 | 20070906 | L110 North | 8 | 1.038 | 1.105 | -0.075 | -0.008 | -0.012 | -0.115 | 0.063 |
7 | 20070906 | L110 South | 9 | 0.999 | 1.131 | -0.141 | -0.001 | -0.103 | -0.132 | 0.031 |
8 | 20070912 | L110 North | 8 | 1.038 | 1.132 | -0.096 | 0.021 | -0.030 | -0.109 | 0.063 |
9 | 20070912 | L113 | 7 | 0.362 | 0.979 | 0.006 | -0.116 | 0.038 | -0.049 | 0.012 |
10 | 20070912 | L95 | 8 | 0.644 | 1.097 | -0.062 | 0.005 | 0.004 | -0.085 | 0.061 |
11 | 20070915 | L110 North | 6 | 0.462 | 1.184 | -0.091 | 0.071 | -0.048 | -0.073 | 0.024 |
The transformed V,R magnitudes of the star being studied are computed
the following way:
V = v + Tv*Tvr*((v-r)-(Vo-Ro))
R = V - [(Vo-Ro) + Tvr*((v-r)-(Vo-Ro))]
or
R = r + Tr*Tvr*((v-r)-(Vo-Ro))
V = R + (Vo-Ro) + Tvr*((v-r)-(Vo-Ro))
where Vo,Ro are the magnitudes of the comparison star and v,r the observed
magnitudes of the star being studied. The only coefficients that are useful
for the transformations are then Tvr, Tv*Tvr, Tr*Tvr:
The coefficients are fairly stable. The adopted values and uncertainties
are the average values and the standard deviations:
Tvr = 1.110 +/- 0.057
Tv*Tvr = -0.007 +/- 0.052
Tr*Tvr = -0.120 +/- 0.047
Telescope and camera configuration.
Computer and software configuration.
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