[vsnet-chat 1888] Revised sequence for V4444 Sgr

["Bruce Sumner" <b.sumner@bom.gov.au>]

Arne has taken additional field photometry of Nova Sagittarii 1999, 
now officially known as V4444 Sgr. This has allowed for the sequence 
to be finalised. The following sequence replaces the preliminary 
sequence issued on May 9, but it should be noted that the actual 
magnitudes have changed very little from the previous posting.
--------------------------------------------------------------------

137  V4444 SAGITTARII   (N Sgr 1999)   Range: 7.8-?
     Position:   18 07 36.20  -27 20 13.3 (J2000, from .dat file)
     Magnitude:  V=10.785  B-V=0.745      (from .dat file)

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

1   18 07 46.3  -27 18 29   135  104  3  11.066  0.000   0.486  0.005 
2   18 07 33.8  -27 16 32   -31  221  3  11.295  0.015   1.225  0.008 
3   18 07 26.3  -27 20 26  -132  -13  3  11.609  0.009   0.764  0.006 
4   18 07 32.7  -27 17 36   -47  157  4  12.146  0.008   0.496  0.013 
5   18 07 22.4  -27 20 35  -184  -22  3  12.404  0.005   1.841  0.005 
6   18 07 46.3  -27 19 25   135   48  3  12.816  0.011   0.791  0.026 
7   18 07 14.6  -27 19 07  -288   66  3  12.905  0.012   1.359  0.016 
8   18 07 40.8  -27 23 09    61 -176  3  13.022  0.012   0.580  0.019 
9   18 07 42.5  -27 23 21    84 -188  3  13.232  0.013   0.694  0.001 
10  18 07 34.5  -27 19 41   -23   32  3  13.645  0.005   1.033  0.029 
11  18 07 35.8  -27 18 38    -5   95  3  13.892  0.008   0.544  0.016 
12  18 07 30.3  -27 19 55   -78   18  3  14.134  0.011   0.681  0.015 
13  18 07 32.3  -27 19 28   -52   45  3  14.290  0.015   1.941  0.019 
14  18 07 38.6  -27 19 15    32   58  3  14.508  0.039   0.742  0.035 
15  18 07 38.0  -27 19 48    24   25  3  14.888  0.033   0.979  0.034 
16  18 07 39.7  -27 20 50    47  -37  3  15.115  0.039   0.905  0.003 
17  18 07 39.2  -27 20 08    40    5  3  15.498  0.079   1.010  0.035 
18  18 07 33.6  -27 19 55   -34   18  3  15.806  0.093   1.873  0.011 
19  18 07 35.5  -27 19 58    -9   15  2  16.077  0.124   2.486  0.116 
20  18 07 35.2  -27 19 47   -14   26  3  16.399  0.150   1.498  0.218 
21  18 07 37.6  -27 19 54    19   19  1  17.187  9.999   1.265  9.999 
  
X and Y arcsec offsets are positive east and positive north 
respectively

Star 19 is very red, and is only included because of its proximity to 
V4444 Sgr. It should not be used as a comparison star. Note also that 
stars 19, 20 and 21 have large magnitude errors due to their 
faintness.

This is an extremely crowded field, and it is important to be very 
careful in identifying the comparison stars correctly. Every effort 
has been made to find comparison stars that are isolated and do not 
have close neighbours that confuse identification. However stars 20 
and 21 do have close, brighter neighbours within 5 to 10 arcsec, so 
these two comparison stars may prove difficult to use.

This sequence has been modified from the original sequence issued on 
9 May, with the addition of another nights data to refine the 
magnitudes even further.


Bruce Sumner
Revised 17 May 1999

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