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[vsnet-chat 5065] Sequence for V2540 Ophiuchi (Nova 2002)


Norwegian Astronomical Society - Variable Star Section

***** Sequence for V2540 Ophiuchi *****

1731-15      V2540 OPHIUCHI (NOVA 2002)

RA = 17h37m34s.60, Decl. = -16o23'23".2 (2000.0)  [D. West, IAUC 7808]

A list of bright comparison stars has been prepared for this nova.
The photometry (V and B-V) is from Tycho-1 catalogue (ESA, 1997) and
should be accurate to within ~0.05 mag. This sequence is primarily
intended for visual observers. I have only selected stars bluer than
B-V = +0.7 in order to minimize colour dependent differences between
visual and V magnitudes. In addition, the magnitude difference
between subsequent stars does not exceed 0.6 mag. The astrometry is
from the Hipparcos (ESA, 1997) and Tycho-2 catalogues (E. Hog et al.,
2000). Dist. is the offset from nova. All sequence stars are located
within a 3 deg. x 3 deg. box centered on V2540 Oph's position. The
last column gives the difference between the Tycho-2 VT and Tycho-1
V magnitudes.

----------------------------------------------------------------
Id.  R.A. (2000.0) Decl.  Star Name  V-mag.  B-V    Dist.  VT-V
     h  m   s    o  '  "                              '   (TYC2)
----------------------------------------------------------------
A   17 36 13.3 -17 51 50  HIP 86142   7.52  +0.56   90.5  +0.05
B   17 33 58.9 -17 50 11  HIP 85952   7.93  +0.37  100.9  +0.05
C   17 42 19.8 -15 00 16  6248-0691   8.32  +0.63  107.8  +0.06
D   17 34 47.0 -16 37 26  HIP 86023   8.75  +0.02   42.6  +0.02
E   17 37 26.5 -15 40 36  6248-0642   8.98  +0.28   42.8  +0.08
F   17 37 29.4 -16 00 07  6248-0934   9.36  +0.54   23.3  +0.05
G   17 37 42.9 -16 22 07  6248-1077   9.94  +0.57    2.4  +0.07
H   17 38 23.0 -16 32 41  6248-0751  10.14  +0.05   14.9  -0.02
----------------------------------------------------------------

Acknowledgement:
In preparing this sequence I have made extensive use of VizieR
Service of Centre de Donnees astronomiques de Strasbourg.

                                       2002 January 31,
                                       Bjorn H. Granslo

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