Table 1: Journal of photometric observations of NGC 1901 and standard star fields, together with calibration coefficients (2005, November 29).
Field Filter Exposure time Seeing Airmass
  [sec.] [ $\prime\prime$]
NGC 1901 U 1200, 60, 5 1.1 1.150-1.280
  B 900, 30, 3 1.0 1.150-1.280
  V 600, 30, 1 1.0 1.150-1.280
  I 600, 30, 1 1.0 1.150-1.280
TPhoenix U 180, 200 1.0 1.024, 1.444
  B 90, 120 1.1 1.023, 1.447
  V 20, 30 1.1 1.024, 1.450
  I 40, 40 1.1 1.022, 1.452
PG 0231+006 U 200, 240 1.1 1.291, 1.801
  B 60, 90 1.1 1.293, 1.807
  V 40, 40 1.1 1.296, 1.809
  I 40, 30 1.1 1.294, 1.810
Rubin 149 U 180, 240 1.0 1.311, 1.651
  B 90, 120 1.1 1.316, 1.649
  V 30, 40 1.0 1.318, 1.647
  I 40, 40 1.0 1.313, 1.643
Calibration $u_1 = +3.285 \pm 0.004$  
coefficients $u_2 = +0.032 \pm 0.006$  
  u3 = +0.46  
  $b_1 = +2.188 \pm 0.004$  
  $b_2 = -0.160 \pm 0.006$  
  b3 = +0.27  
  $v_{1bv} = +2.188 \pm 0.014$ $i_1 = +2.789 \pm 0.044$
  $v_{2bv} = +0.017 \pm 0.018$ $i_2 = +0.021 \pm 0.043$
  v3 = +0.12 i3 = +0.06
  $v_{1vi} = +2.188 \pm 0.016$  
  $v_{2vi} = +0.013 \pm 0.016$  


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