173  V2400 OPHIUCHI   (DQ)   Range: ? - 14.5V  
     Position:   17 12 36.41  -24 14 44.7  (J2000, from .dat file)
     Magnitude:  V=14.470  B-V=0.326       (in .dat file)
                                                            
ID      RA  (2000)   DEC       X    Y  N    V      ERR     B-V    ERR 

a) Comparison star sequence

1    17 12 43.5  -24 13 28    97   77  3  11.192  0.058   0.351  0.041   
2    17 12 53.8  -24 09 00   238  345  3  12.158  0.014   0.826  0.008   
3    17 12 40.0  -24 19 16    49 -271  3  12.841  0.000   0.691  0.006   
4    17 12 42.7  -24 15 04    87  -19  3  13.422  0.006   0.713  0.008   
5    17 12 27.2  -24 13 33  -126   72  3  13.725  0.006   0.665  0.002   
6    17 12 30.5  -24 12 16   -80  149  3  14.034  0.000   0.843  0.006   
7    17 12 37.9  -24 13 07    21   98  3  14.637  0.006   0.907  0.009   
8    17 12 37.0  -24 13 50     8   55  3  14.776  0.008   0.915  0.010   
9    17 12 52.4  -24 12 32   219  133  3  15.011  0.000   0.509  0.011   
10   17 12 37.4  -24 15 16    13  -31  3  15.721  0.029   1.510  0.005   
11   17 12 34.5  -24 14 31   -26   14  3  16.192  0.019   1.059  0.003   


b) Wide-colour extension for CCD calibration

     17 13 01.3  -24 12 19   340  146  3  12.426  0.029   0.346  0.003   
     17 12 30.0  -24 14 55   -88  -10  3  12.254  0.024   1.826  0.005   
     17 12 34.5  -24 10 24   -27  261  3  13.603  0.011   2.041  0.004      
     17 12 49.6  -24 10 09   181  276  3  15.302  0.030   2.083  0.007   
     17 12 49.7  -24 19 29   182 -284  3  14.218  0.032   2.314  0.018   
 

Notes:

1. Star 10 (15.721/1.510) would not normally be included in a sequence due
to its red colour. However it is included here because of its proximity to
V2400 Oph, being 34 arcsec SE of the variable. It should be used for
guidance only.


Bruce Sumner
14 July 2000