225  CE-315   (CV)   Range: ?-17.7V
     Position:   13 12 46.41  -23 21 32.4 (J2000, from .dat file)
     Magnitude:  V=17.708  B-V=0.132      (in .dat file)

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

a) Comparison star sequence

1    13 12 37.8  -23 21 23  -118    9  3  11.062  0.116   0.514  0.044   
2    13 12 57.9  -23 21 45   158  -13  3  13.038  0.010   0.886  0.005   
3    13 12 59.4  -23 21 38   179   -6  3  13.375  0.006   1.084  0.007   
4    13 12 52.4  -23 18 45    83  167  3  14.061  0.006   0.639  0.005   
5    13 12 57.2  -23 25 33   149 -241  3  14.430  0.011   1.051  0.006   
6    13 12 43.1  -23 25 40   -46 -248  3  14.970  0.005   0.948  0.009   
7    13 12 40.6  -23 15 41   -80  351  1  15.284  0.004   0.607  0.006   
8    13 13 15.1  -23 24 54   395 -202  3  15.645  0.023   0.690  0.007   
9    13 12 49.4  -23 22 03    41  -31  3  16.303  0.020   0.610  0.022   
10   13 12 54.5  -23 22 47   111  -75  2  16.996  0.026   0.792  0.020   
11   13 12 46.2  -23 20 58    -2   34  3  17.600  0.032   0.729  0.047   


b) Wide-colour extension for CCD calibration

None available

       
Notes:

1. There are two bright Tycho-2 stars that were not measured as 
part of this sequence. They are at 13h 12m 20.9s -23d 20' 07" and 
13h 12m 16.2s -23d 28' 47" with reliable magnitudes of respectively 
V=9.78+/-0.03 and V=10.85+/-0.06.

2. This is a new ultra-short period CV (helium CV, like CP Com) 
discovered by M. T. Ruiz et. al. in their proper motion survey 
program. The orbital period is 65.1+/-0.7 min. It is also identified 
with Luyten's high proper motion star NLTT 854-35 and it has a ROSAT
detection as 1RXS J131246.8-232118.


Bruce Sumner
3 June 2001