163  IY URSAE MAJORIS   (UGSU)   Range: 13.5-18.4V
     Position:   10 43 56.80  +58 07 32.4  (J2000, from .dat file)
     Magnitude:  V=18.351   V=0.168        (Henden, single night)
                                                            
ID      RA  (2000)   DEC       X    Y  N    V      ERR     B-V    ERR 

1    10 44 38.7  +58 03 33   332 -239  3  12.381  0.158   0.787  0.114   
2    10 43 32.9  +58 11 42  -189  250  3  13.268  0.009   0.210  0.004   
3    10 43 44.4  +58 06 08   -98  -84  3  13.554  0.000   0.925  0.009   
4    10 44 34.7  +58 08 22   300   50  3  14.245  0.000   0.839  0.007   
5    10 44 38.7  +58 08 23   332   51  3  14.665  0.008   0.799  0.008   
6    10 43 38.4  +58 09 15  -145  102  3  15.588  0.006   0.575  0.006   
7    10 44 21.4  +58 02 56   195 -276  3  16.551  0.000   0.554  0.012   
8    10 44 18.9  +58 04 18   175 -194  3  17.156  0.011   0.600  0.007   
9    10 43 54.3  +58 07 11   -20  -21  3  17.637  0.030   1.121  0.039   
10   10 44 04.3  +58 07 43    59   11  3  17.853  0.020   0.721  0.004   
11   10 44 04.3  +58 09 22    59  110  3  18.623  0.029   1.280  0.138   


b) Wide-colour extension for CCD calibration

None available.


Notes:

1. The variable is the SW component of a faint double system with 
separation of just a few arc-seconds. The NE component appears fuzzy
and would seem to be a very faint galaxy of about magnitude 20. 

2. Discovered on 9 November 1997 by K. Takamizawa and named TMZ V85. 
It was found to be a deeply eclipsing SU UMa-type dwarf nova in January 
2000 when superhumps with a period of 0.07588d was detected (Uemura 
2000. PAPJ, 52, 9). 

3. Varies considerably at minimum between about V=17.1 and V=18.4.


Bruce Sumner
20 January 2000
Revised 20 January 2001