226  V478 HERCULIS   (UGSU)   Range: 15.5p-17.2V
     Position:   17 21 05.63  +23 39 37.0 (J2000, from .dat file)
     Magnitude:  V=17.183  B-V=0.422      (Henden, single night)

ID     RA (2000)    DEC       X    Y   N    V      ERR     B-V    ERR 

a) Comparison star sequence
    
1    17 21 01.7  +23 40 30   -53   53  1  12.470  0.001   0.610  0.001   
2    17 21 11.6  +23 42 39    82  182  1  13.350  0.001   1.044  0.001   
3    17 20 50.0  +23 41 44  -214  127  1  13.465  0.001   1.014  0.002   
4    17 20 52.1  +23 41 26  -186  109  1  14.064  0.002   0.704  0.003   
5    17 21 01.1  +23 43 48   -61  251  1  14.312  0.002   1.205  0.004   
6    17 21 05.8  +23 36 17     3 -200  1  14.615  0.002   0.777  0.003   
7    17 21 08.6  +23 38 25    41  -72  1  14.981  0.003   0.642  0.004   
8    17 21 08.6  +23 39 49    41   12  1  15.588  0.004   0.656  0.006   
9    17 21 16.8  +23 38 26   154  -72  1  16.025  0.005   0.802  0.008   
10   17 21 09.1  +23 39 11    48  -26  1  16.751  0.007   1.002  0.012   
11   17 21 11.6  +23 38 16    82  -81  1  17.558  0.014   0.671  0.021   
12   17 21 13.4  +23 39 33   107   -4  1  18.322  0.033   0.681  0.049   


b) Wide-colour extension for CCD calibration

     17 20 59.8  +23 36 53   -79 -164  1  14.880  0.002   1.468  0.004  


Notes:

1. This sequence is based on photometry obtained on a single night. 
Errors are expected to be approximately +/-0.02 magnitude. 

2. There are three additional bright stars in this field that were 
not measured as part of this sequence. Their positions and reliable
magnitudes, taken from Tycho-2, are:

17h 21m 01.6s  +23d 40' 15" and V=9.35+/-0.02
17h 21m 25.7s  +23d 37' 22" and V=9.85+/-0.02
17h 21m 12.9s  +23d 34' 21" and V=10.98+/-0.05


Bruce Sumner
18 June 2001