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[vsnet-chat 1671] Updated sequence for U Sco

UPDATED COMPARISON STAR SEQUENCE FOR U SCORPII

Following comments from several observers, I have amended my comparison
star sequence for U Scorpii (ref. vsnet-chat 1667, vsnet-alert 2724 and
AAVSO-DIS 1 March 1999). I have extended the sequence to very faint limits,
which will only assist CCD observers, corrected the declination of the
13.74 star, and more importantly, deleted several stars which were not
necessary, or too red, for the sequence. In particular, I have deleted the
bright double star, 12.565 and 12.730, from the sequence, as being
separated by only 25arcsec, they may have proven difficult to use in the
field. The resulting final sequence is however as compact, complete and as 
unambiguous as it can be made.  

Note that star 1 is Bjorn Granslo's 'D' and star 2 is 'E' (ref. vsnet 1777)
There is a definite inconsistency between the Tycho magnitudes and Menzies
magnitudes of these two stars. I would favour the Menzies values (as given 
here), but this is my opinion only, we need new BV photometry to resolve the 
issue. Any takers? I wish to thank Arne Henden for the CCD field photometry 
from which most of this sequence is derived.
___________________________________________________________________________

       U SCORPII  (NR)   Range: 8.0-18.5V
       16 22 30.779  -17 52 42.94
       Magnitude in .dat file: V=18.510 B-V=0.459 

ID    RA (2000)    DEC       X    Y  N    V      ERR     B-V   ERR  Adopted 
                                                                        v
1   16 23 16.1  -17 50 15  648  150     10.61                          10.6
2   16 22 25.8  -18 02 59  -72 -616     10.94                          10.9
3   16 22 54.0  -17 45 08  332  454     11.53                          11.5
4   16 22 45.8  -17 51 52  214   51  3  12.588  0.005   1.238  0.003   12.6
5   16 22 46.5  -17 57 01  224 -258  3  12.783  0.000   0.795  0.007   12.8
6   16 22 44.4  -17 47 32  194  311  3  13.167  0.005   0.641  0.008   13.2
7   16 22 31.7  -18 01 13   14 -510     13.74                          13.7
8   16 22 11.9  -17 57 33 -270 -290  3  14.286  0.009   0.870  0.014   14.3
9   16 22 29.2  -17 54 50  -23 -127  3  14.628  0.005   1.168  0.002   14.6
10  16 22 38.9  -17 56 51  115 -248  3  14.751  0.005   0.967  0.009   14.8
11  16 22 36.8  -17 51 55   86   48  3  15.098  0.006   0.837  0.006   15.1
12  16 22 27.5  -17 54 15  -47  -92  3  15.494  0.016   0.818  0.015   15.5
13  16 22 25.6  -17 51 34  -75   69  3  15.863  0.006   1.120  0.015   15.9
14  16 22 22.2  -17 52 40 -123    3  3  16.090  0.006   0.806  0.023   16.1
15  16 22 36.2  -17 51 22   77   81  3  16.383  0.016   0.863  0.020   16.4
16  16 22 31.8  -17 53 52   14  -69  3  16.635  0.023   0.822  0.032   16.6
17  16 22 29.2  -17 52 19  -22   24  3  16.697  0.019   0.856  0.038   16.7
18  16 22 27.9  -17 51 32  -41   71  3  16.918  0.009   0.791  0.009   16.9
19  16 22 27.1  -17 53 57  -53  -74  3  17.293  0.033   0.827  0.019   17.3 
20  16 22 32.5  -17 54 23   24 -100  3  17.481  0.058   0.841  0.072   17.5
21  16 22 37.3  -17 53 03   92  -20  3  17.978  0.039   1.273  0.017   18.0 
22  16 22 30.2  -17 53 01   -9  -18  3  18.491  0.103   0.620  0.135   18.5
___________________________________________________________________________

Note that positive X and positive Y offsets are north & east respectively.

Bruce Sumner

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