87   CT HYDRAE   (UGSU)   Range: 13.8-18.8V
     Position:   08 51 07.41  +03 08 34.5  (J2000, from .dat file)
     Magnitude:  V=18.845  B-V=0.012       (Henden, single night)

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

a) Comparison star sequence
    
1    08 51 13.3  +03 05 42    88 -172  3  10.051  0.000   1.107  0.011   
2    08 50 55.7  +03 06 39  -176 -115  3  11.415  0.013   0.433  0.004   
3    08 51 14.3  +03 11 40   103  186  6  13.076  0.013   1.024  0.010   
4    08 51 09.7  +03 09 44    35   70  5  13.638  0.005   0.674  0.005   
5    08 51 21.6  +03 08 14   212  -20  3  14.015  0.005   0.825  0.011   
6    08 51 00.2  +03 09 16  -108   42  3  14.547  0.008   0.528  0.009   
7    08 50 57.1  +03 12 49  -154  255  3  14.766  0.005   0.543  0.012   
8    08 50 58.1  +03 05 16  -139 -198  3  15.376  0.009   1.337  0.019   
9    08 51 16.9  +03 10 37   142  123  3  15.615  0.000   0.937  0.015   
10   08 51 17.9  +03 08 39   157    5  3  16.102  0.006   0.752  0.018   
11   08 51 11.2  +03 08 37    57    3  3  17.145  0.013   1.112  0.065   
12   08 51 08.8  +03 07 22    21  -72  3  17.562  0.034   0.367  0.058   
13   08 51 06.5  +03 07 59   -13  -35  2  18.549  0.166   1.398  0.445   


b) Wide-colour extension for CCD calibration

     08 51 10.8  +03 10 59    50  145  3  15.946  0.041   0.306  0.009   
     08 51 01.2  +03 12 30   -93  236  3  16.497  0.013   0.523  0.025   
     08 51 13.5  +03 06 15    91 -139  3  16.476  0.029   1.428  0.030   
     08 51 16.9  +03 05 19   142 -195  3  16.450  0.106   1.434  0.042   

Notes:

1. Star #1 is saturated, but it has an accurate Tycho-2 magnitude of
V=10.13+/-0.04.

2. Superhumps were detected during the February 1999 superoutburst, 
with a period of 0.0664d (Kato, et al. 1999, IBVS 4794). 

3. CT Hya varies at minimum between about V=18.2 and V=18.8.


Bruce Sumner
Revised 28 July 1999
Revised 12 December 2000