218  AP LIBRAE   (BLLAC)   Range: 14.0-16.7B
     Position:   15 17 41.81  -24 22 19.4   (J2000, from .dat file)
     Magnitude:  V=15.387  B-V=0.809        (.dat file, single night)

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

a) Comparison star sequence

1    15 17 35.2  -24 27 07   -90 -287  1  11.548  0.001   0.700  0.001   
2    15 17 22.5  -24 26 05  -263 -226  1  11.842  0.001   0.954  0.001   
3    15 17 57.9  -24 27 30   220 -311  1  12.328  0.001   0.585  0.001   
4    15 17 52.7  -24 25 47   149 -208  1  12.666  0.001   0.919  0.001   
5    15 17 38.3  -24 18 01   -48  258  1  13.120  0.001   0.693  0.001   
6    15 17 50.3  -24 23 01   117  -41  1  13.835  0.002   0.907  0.003   
7    15 17 18.1  -24 23 44  -324  -85  1  14.268  0.002   0.666  0.003   
8    15 17 27.8  -24 25 54  -191 -215  1  14.707  0.002   0.840  0.004   
9    15 17 31.7  -24 25 28  -138 -189  1  15.289  0.003   0.703  0.005   
10   15 17 33.7  -24 20 48  -111   91  1  16.209  0.006   0.757  0.009   
11   15 17 40.3  -24 21 30   -20   49  1  16.746  0.009   0.470  0.012   
12   15 17 46.6  -24 22 27    66   -8  1  17.049  0.011   0.678  0.016   


b) Wide-colour extension for CCD calibration
 
     15 17 19.9  -24 17 50  -299  269  1  14.298  0.002   0.540  0.003   
     15 17 40.4  -24 19 33   -19  166  1  14.251  0.002   1.444  0.004   


Notes:

1. This single night sequence is expected to have errors of about 
0.02 magnitude.

2. There is a bright star in the south of this fields. One is at 
15h 17m 45.1s -24d 25' 44" with a reliable Tycho-2 magnitude of
V=9.79+/-0-03.

3. Also in the south of the field is the bright variable star NSV 20287,
located at 15h 17m 34.9s -24d 28' 38". It is catalogued as type IB with 
a range of 10.07-10.24H and a period of 0.12 days.


Bruce Sumner
3 April 2001