40   V592 HERCULI   (UGWZ?)   Range: 12.3-20.6V
     Position:   16 30 56.43  +21 16 58.7  (J2000, from .dat file)
     Magnitude:   V=20.670  B-V=0.300      (Henden, single night)

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

a) Comparison star sequence

1    16 30 48.1  +21 20 37  -116  218  4  12.083  0.081   1.444  0.089   
2    16 30 38.9  +21 13 23  -245 -216  4  12.784  0.012   0.770  0.015   
3    16 31 14.0  +21 20 45   246  226  4  13.289  0.014   1.106  0.011   
4    16 31 18.6  +21 20 11   310  192  4  13.886  0.034   0.805  0.016   
5    16 30 48.0  +21 12 04  -117 -295  3  14.172  0.041   0.636  0.032   
6    16 30 48.6  +21 13 19  -109 -220  4  14.448  0.013   0.674  0.016   
7    16 30 48.6  +21 19 19  -110  140  4  14.920  0.020   0.408  0.016   
8    16 31 03.0  +21 19 17    92  138  4  15.117  0.018   0.641  0.011   
9    16 30 53.4  +21 15 54   -42  -65  4  15.311  0.015   0.712  0.008   
10   16 30 49.5  +21 17 46   -97   47  4  15.608  0.022   0.900  0.017   
11   16 30 53.7  +21 14 28   -38 -151  4  16.198  0.031   0.745  0.034   
12   16 31 05.1  +21 17 07   122    8  3  17.204  0.027   0.893  0.068   
13   16 30 57.1  +21 17 43    10   44  3  17.932  0.112   0.600  0.024   
14   16 30 56.5  +21 17 23     2   24  2  18.641  0.069   1.184  0.041   


b) Wide-colour extension for CCD calibration
  
     16 31 18.0  +21 11 40   303 -319  2  17.248  0.081   0.388  0.120   
     16 31 10.6  +21 18 31   199   92  3  16.939  0.025   1.445  0.055   
     16 31 09.2  +21 13 37   180 -203  4  17.252  0.072   1.481  0.061   


Notes:

1. Star #1 is saturated, use with care.

2. There is an AAVSO preliminary 'e' chart dated 08/1998 that contains 
PEP(V) photometry originating from Geneva Observatory.

                         ID   Henden   AAVSO
                                V        V
                         1    12.083   11.6
                         2    12.784   12.5
                         3    13.289   13.0
                         4    13.886   13.3 See note below
                         5    14.172   14.2
                         6    14.448   14.2
                         7    14.920   14.6
                         9    15.311   14.9
                         10   15.608   15.2
                         11   16.192   15.8

Star 4 appears to be wrong on the AAVSO chart. It may be a typographical
error.

3. There is an obvious stellar image at about magnitude 19 on the PSS plate
dated 22 May 1995 at position 16 30 59.51 -21 16 24.2. It does not appear
on plates taken in 1982 or 1991. On the 1991 plate there is nothing at 
this position down to about magnitude 22.

4. Originally classified as a nova, but subsequently shown to be a large 
amplitude dwarf nova when superhumps were detected by Garradd (1998). 
This variable is extremely faint at minimum. The identification chart 
in Downes and Shara (1993) is incorrect. 

5. Varies at minimum between about V=15.8 and V=16.0.


Bruce Sumner
Revised 29 July 1999