126  KS UMA (formerly SBS1017+533)   
     (UGSU)   Range: 12.6-17.2V
     Position:   10 20 26.49  +53 04 33.5 (J2000, from .dat file)
     Magnitude:  V=17.210  B-V=0.235      (from .dat file)

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

a) Comparison star sequence

1    10 21 34.1  +53 08 16   609  222  2  12.982  0.006   0.947  0.016   
2    10 21 30.1  +53 10 34   572  360  2  13.217  0.008   0.530  0.022   
3    10 21 14.7  +53 09 45   433  312  2  13.728  0.006   0.575  0.014   
4    10 20 56.7  +53 03 37   272  -56  5  14.239  0.023   0.725  0.023   
5    10 20 28.2  +53 06 37    15  124  3  14.513  0.008   0.504  0.014   
6    10 20 46.9  +53 06 12   184   99  3  14.937  0.011   0.777  0.011   
7    10 21 00.3  +53 04 16   304  -17  5  15.088  0.010   0.661  0.010   
8    10 20 25.9  +53 05 32    -5   59  3  15.507  0.011   0.687  0.012   
9    10 20 41.0  +53 04 58   130   25  3  16.033  0.018   0.574  0.024   
10   10 20 14.9  +53 04 18  -105  -15  3  17.115  0.028   0.473  0.015   
11   10 20 37.0  +53 03 48    95  -46  3  18.167  0.016   1.300  0.140   


b) Wide-colour extension for CCD calibration

     10 20 03.5  +53 04 49  -207   16  3  17.350  0.039   1.588  0.031   
     10 20 56.3  +53 08 21   268  228  4  17.752  0.071   1.425  0.056   


Notes:

1. This Byrukan variable was also discovered by ROSAT and named RX 
J1020.4+5304. For a complete history of this variable see Hazan and 
Garnavich 1999, JAVSO 27, 19. 

2. There is a close companion to this variable star located about 
5 arcsec to the east with a magnitude of about 18. 

3. Minimum appears to be in the range V=17.0 to V=17.2.


Bruce Sumner
Revised 6 June 1999