142  GW LIBRAE  (UG)   Range: 9.0-17.0V
     Position:   15 19 55.33  -25 00 24.5 (J2000, from .dat file)
     Magnitude:  V=17.016  B-V=0.115      (Henden, single night)

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

a) Comparison star sequence

1    15 19 41.3  -24 58 57  -191   88  3  11.007  0.185   1.340  0.179   
2    15 20 00.5  -25 03 00    70 -155  3  11.133  0.154   0.546  0.047   
3    15 19 50.1  -24 55 56   -71  269  3  12.022  0.020   0.899  0.005   
4    15 20 09.7  -24 58 52   196   93  3  12.346  0.014   1.654  0.009   
5    15 19 44.0  -25 02 05  -154 -100  3  12.821  0.016   1.024  0.008   
6    15 20 05.4  -24 56 08   138  257  3  12.984  0.019   0.952  0.012   
7    15 19 47.0  -25 01 44  -113  -79  3  13.771  0.014   0.721  0.014   
8    15 19 39.5  -25 00 32  -214   -7  3  14.326  0.015   0.855  0.013   
9    15 20 01.7  -24 58 38    87  107  3  14.712  0.017   0.947  0.006   
10   15 19 56.3  -24 58 50    13   95  3  15.124  0.019   1.014  0.014   
11   15 19 55.4  -25 00 51     1  -26  3  15.700  0.014   0.783  0.008   
12   15 19 51.6  -25 00 30   -50   -5  3  16.628  0.006   0.693  0.184   
13   15 19 57.8  -25 00 26    33   -1  3  17.521  0.031   0.619  0.027   


b) Wide-colour extension for CCD calibration

     15 20 14.8  -24 58 28   265  117  2  17.488  0.048   0.058  0.048   
     15 19 33.5  -25 00 30  -297   -5  3  17.567  0.009   0.330  0.012   
     15 19 33.5  -24 58 05  -297  140  3  16.790  0.027   1.606  0.051   
     15 19 32.0  -25 03 42  -316 -197  3  18.094  0.080   1.857  0.154   


Notes:

1. Stars #1 and #2 are saturated, and have large errors as a result. 
However they both have reliable Tycho-2 magnitudes which should be used 
in place of the magnitudes measured as part of this sequence. These 
magnitudes are for star #1 V=10.69+/-0.08 and star #2 V=10.62+/-0.09. 
There is another bright star on the east edge of the field with a Tycho-2 
magnitude of V=9.37+/-0.03.

2. A VSS RASNZ chart exists for this variable, chart No. 1197. The 
letters  on that chart correspond to the following comparison stars 
in this sequence:

                    ID  RASNZ    
                        letter  
                    1     f          
                    2     g      
                    3     l      
                    5     m       
                    7     n      
                    8     o      
                    9     p

3. Appears to be fairly constant at minimum at about V=17.0.


Bruce Sumner
Revised 13 June 1999