141  IR COMAE   (UGSU)   Range: 13.5-18.7V
     Position:   12 39 32.03  +21 08 06.5 (J2000, from .dat file)
     Magnitude:  V=18.736  B-V=-0.918     (Henden, single night)

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

a) Comparison star sequence

1    12 39 59.8  +21 07 23   389  -43  2  12.503  0.000   0.712  0.003   
2    12 39 53.7  +21 04 13   304 -233  3  13.505  0.010   0.670  0.002   
3    12 39 54.4  +21 06 56   313  -70  5  13.768  0.000   1.160  0.006   
4    12 39 55.3  +21 07 28   325  -38  5  14.319  0.011   1.401  0.012   
5    12 39 46.4  +21 14 16   201  370  3  15.249  0.009   0.610  0.002   
6    12 39 52.8  +21 08 10   291    4  3  15.815  0.009   0.584  0.007   
7    12 39 30.7  +21 10 40   -19  154  3  16.226  0.016   0.637  0.010   
8    12 39 25.5  +21 10 34   -91  148  3  16.722  0.006   0.813  0.015   
9    12 39 41.6  +21 08 07   134    1  3  17.551  0.061   1.568  0.097   
10   12 39 16.8  +21 09 28  -213   82  3  17.905  0.009   1.364  0.098   
11   12 39 42.7  +21 06 24   150 -102  3  18.508  0.026   0.938  0.053   


b) Wide-colour extension for CCD calibration

     12 39 53.6  +21 04 41   302 -206  2  17.752  0.020   0.429  0.008   
     12 39 32.2  +21 14 01     3  355  3  17.454  0.006   0.485  0.005   
     12 39 59.2  +21 03 29   381 -277  2  17.843  0.126   1.631  0.069   


Notes:

1. In the southwest, just outside the sequence area, lies a very 
bright star. It was measured by Tycho-2 with an accurate magnitude 
of V=5.49+/-0.02.

2. Shown as Com1 in Downes and Shara (1993). Minima usually vary between 
V=17.3 and V=17.8, but on one night it was as faint as V=18.7.


Bruce Sumner
Revised 12 June 1999
Revised 17 December 2000