[vsnet-alert 4607] Sequence Norma II near XTE J1550-564

[Mati Morel <morel@ozemail.com.au>]

Re: [vsnet-alert 4604] XTE J1550-564.
       The UBV sequence Norma II (Bok, Bok and Miller 1972; AJ 77,733-744)
is probably
the closest published sequence to the X-ray transient XTE J1550-564, now in
an active
state. The sequence may be useful as it goes down to 15.20V, and is only
about 15' N
of the transient. The full sequence is given below, with J2000 positions and
GSC ids.

BBM #    RA2000   DEC2000     V    B-V    U-B    GSC    Other
==============================================================
1    15h52m03.1s -56 21'06"  9.19  0.10  0.00  8705.02154  HD 141486
2    15 51 24.5  -56 15 31  10.34  0.52  0.11  8705.02732
3    15 50 55.9  -56 19 53  10.27  1.16  0.86  8705.02311
4    15 51 45.8  -56 04 56  10.82  0.68  0.17  8701.01244
5    15 52 05.9  -56 00 14  11.37  0.48  0.27  8701.00551
6    15 51 23.6  -56 13 17  11.49  0.47  0.10  8701.00934  
7    15 51 19.2  -56 15 59  12.40  0.57  0.14  8705.02467
8    15 50 14.7  -56 14 31  12.49  0.52  0.06  8701.01207
9    15 51 51.8  -56 06 01  12.80  0.55  0.05
10   15 51 13.3  -56 17 11  12.98  0.63  0.33
11   15 51 38.7  -56 10 16  13.07  0.66  0.07 
12   15 51 38.4  -56 12 48  13.37  0.47  0.19
13   15 52 12.3  -56 11 42  13.55  0.61  0.44
14   15 51 20.3  -56 13 42  13.78  0.62  0.18
15   15 51 40.4  -56 01 18  13.94  0.62  0.05
16   15 52 20.5  -56 19 22  14.13  0.66  0.10
17   15 52 12.0  -56 19 47  15.20  0.92  0.62

XTE J1550-564:
     15 50 58.78 -56 28 35.0

Notes:
Positions for stars 9-17 have been extracted from USNO-A2.0.
There is no problem with GSC mags for this region. They are generally within
0.2 of V.

Ref:
B.J. Bok, P.F. Bok and E.W. Miller 1972: Astron. J. 77,733-744. "Photometric
Standards
for the Southern Hemisphere. II".
  
Regards,

 
/Mati

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