88.  MM HYDRAE   (UGSU)   Range: 13.0-18.8V
     Position:   09 14 14.05  -06 47 44.5 (J2000, from .dat file)
     Magnitude:  V=18.809  B-V=0.264      (from .dat file)

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

a) Comparison star sequence

1    09 14 06.9  -06 45 51  -107  113  3  12.580  0.016   0.438  0.007   
2    09 14 04.0  -06 47 29  -150   15  3  13.954  0.011   0.918  0.005   
3    09 14 01.8  -06 46 59  -184   45  3  14.197  0.013   0.668  0.002   
4    09 14 21.1  -06 46 14   104   90  3  14.489  0.012   0.554  0.006   
5    09 14 20.7  -06 47 18    98   26  3  14.699  0.012   0.888  0.002   
6    09 14 07.1  -06 47 50  -104   -6  3  14.956  0.009   1.005  0.005   
7    09 14 31.9  -06 48 44   266  -60  3  15.645  0.016   0.770  0.018   
8    09 14 14.4  -06 49 59     4 -135  3  16.053  0.037   0.471  0.015   
9    09 14 31.6  -06 48 29   261  -45  3  16.554  0.026   0.556  0.011   
10   09 14 17.7  -06 48 15    54  -31  3  17.221  0.000   0.788  0.048   
11   09 14 13.3  -06 47 40   -12    4  3  17.743  0.009   0.451  0.035   
12   09 14 13.2  -06 49 13   -13  -89  3  17.979  0.120   0.971  0.136   


b) Wide-colour extension for CCD calibration

     09 14 31.8  -06 51 06   263 -202  3  14.455  0.014   0.487  0.004   
     09 14 31.8  -06 47 34   264   10  3  17.554  0.064   1.564  0.099   


Notes:

1. MM Hya is in outburst at about magnitude 14 on SERC-J Survey plate S778, 
taken on 19 February 1982.

2. There are three bright Tycho-2 stars with reliable magnitudes. One on 
the west edge is V=8.12+/-0.01. Another on the east edge is V=9.59+/-0.03 
and the third in the southeast corner is V=10.69+/-0.08.

3. Superhumps detected in March 1998 (Novak 1998 vsnet 1318) with a 
period of 0.0589d, showing that this is another SU UMa-type dwarf nova. 
Shown as Hya1 in Downes and Shara (1993). 

4. Minimum values range from V=18.5 to V=18.8.

 
Bruce Sumner
Revised 28 June 1999