104  V650 ORIONIS   (UG)   Range: 15.5-19.2V
     Position:   05 31 08.32  +09 45 09.7 (J2000, from .dat file)
     Magnitude:  V=19.242  B-V=0.507      (.dat file, single night)

ID     RA (2000)    DEC       X    Y   N    V      ERR     B-V    ERR  
   
a) Comparison star sequence

1    05 31 15.8  +09 41 20   111 -230  3  11.644  0.045   1.398  0.073   
2    05 31 32.1  +09 50 11   351  301  2  12.275  0.011   1.242  0.017   
3    05 31 11.7  +09 48 53    51  223  3  12.458  0.011   0.729  0.002   
4    05 30 53.8  +09 49 35  -214  265  3  12.816  0.005   0.808  0.003   
5    05 31 07.1  +09 43 09   -18 -121  3  13.117  0.005   0.848  0.004   
6    05 31 23.0  +09 47 41   217  151  3  13.560  0.005   0.715  0.007   
7    05 31 29.7  +09 49 07   316  237  3  13.854  0.008   0.803  0.006   
8    05 31 05.3  +09 45 05   -44   -5  3  14.401  0.005   0.648  0.004   
9    05 31 11.7  +09 44 17    50  -53  3  14.747  0.005   1.146  0.004   
10   05 30 55.2  +09 44 15  -193  -55  3  15.118  0.000   0.935  0.005   
11   05 31 15.5  +09 43 17   106 -113  3  15.264  0.009   1.412  0.026   
12   05 31 01.4  +09 46 05  -101   55  3  15.802  0.009   1.170  0.005   
13   05 31 04.4  +09 46 44   -58   94  3  16.266  0.011   1.006  0.008   
14   05 31 08.0  +09 44 55    -5  -16  3  16.717  0.009   0.835  0.028   
15   05 31 08.9  +09 44 45     8  -25  3  18.246  0.050   0.895  0.059   


b) Wide-colour extension for CCD calibration

     05 31 21.3  +09 40 53   192 -257  3  14.084  0.005   0.573  0.006   
     05 31 00.1  +09 47 04  -120  114  3  13.636  0.008   1.305  0.002   


Notes:

1. Stars #1 and #2 are saturated and their magnitudes and colours 
are approximate. They should be used only for guidance until accurate
magnitudes are determined.

2. Star #1 is also NSV 2064, classified as a type LB variable with a
magnitude range of 13 to 14. 


Bruce Sumner
14 April 1999
Revised 23 January 2001