268  V391 LYRAE   (UGZ)    Range: 140.p-17.0p
     Position:   18 21 11.97  +38 47 43.7  (J2000, from .dat file)
     Magnitude:  V=14.764  B-V=0.019       (Henden, .dat file)
                                                            
 ID     RA  (2000)   DEC       X    Y  N    V     ERR      B-V    ERR 

a) Comparison star sequence

1    18 21 32.3  +38 45 16   237 -148  1  10.809  0.000   0.810  0.000   
2    18 21 09.2  +38 48 29   -33   45  1  11.350  0.000   0.414  0.001   
3    18 21 37.9  +38 46 57   302  -47  1  11.627  0.001   0.544  0.001   
4    18 21 09.7  +38 45 42   -27 -122  1  12.157  0.001   1.103  0.001   
5    18 21 14.2  +38 46 42    26  -62  1  12.497  0.001   0.690  0.001   
6    18 21 11.3  +38 48 25    -8   41  1  12.767  0.001   0.625  0.002   
7    18 20 52.2  +38 49 04  -232   80  1  13.628  0.002   0.381  0.003   
8    18 20 54.4  +38 48 33  -206   49  1  13.854  0.002   1.082  0.006   
9    18 21 02.5  +38 47 37  -111   -7  1  14.283  0.003   0.538  0.006   
10   18 20 57.5  +38 47 12  -170  -32  1  14.737  0.003   0.624  0.009   
11   18 21 03.9  +38 49 54   -94  130  1  14.914  0.004   0.560  0.010   
12   18 20 53.9  +38 44 47  -212 -177  1  15.222  0.005   0.612  0.013   
13   18 21 07.2  +38 47 42   -56   -2  1  15.635  0.008   0.766  0.023   
14   18 21 18.9  +38 48 37    81   53  1  16.097  0.011   0.582  0.028   
15   18 21 00.7  +38 49 21  -132   97  1  16.618  0.017   0.663  0.047   
16   18 21 11.9  +38 47 55    -1   11  1  17.222  0.031   0.839  0.106   


b) Wide-colour extension for CCD calibration
     
     18 20 58.2  +38 43 44  -161 -240  1  14.875  0.004   1.280  0.018   


Notes:

1. This is a preliminary sequence based on photometry obtained on a single
night. The external errors are expected to be about +/-0.02 mag.

2. The first three stars are saturated and their magnitudes and colours 
are approximate. They should be used for guidance only. However star #1
does have an accurate Tycho-2 magnitude of 10.31+/-0.04.


Bruce Sumner
25 March 2002