[vsnet-j 1414] V2274 Cyg sequence

[Taichi Kato <tkato>]

V2274 Cyg sequence

　Henden & Sumner の比較星光度です。

Subject: [vsnet-sequence 87] Sequence of V2274 Cygni (Nova 2001)

Norwegian Astronomical Society - Variable Star Section

----- Sequence of V2274 Cygni  [Version 2001 July 22] -----

Object: V2274 Cygni = Nova Cygni 2001
Position: R.A. = 20h07m17s.9, Decl. = +36o04'37" (2000.0)
Magnitude: 11.7 V - <19 R

H. Yamaoka, Kyushu University, Japan reports [vsnet-alert 6072]
that this nova was discovered by Y. Nakamura, Mie, Japan, from
an exposure (using 200-mm f/4 lens and Tri-X film) obtained on
2001 July 13.651 UT (mag. 11.9). The discovery was confirmed by
H. Fukushima on July 16.515 UT (V = 11.69). Spectroscopy by
T. Iijima, Asiago Astrophysical Observatory, Italy, showed that
that this object was a classical nova [vsnet-alert 6075].

I have selected comparison stars from a large list of CCD BVRI
measurements by A. Henden, USNO, obtained at

http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/ncyg01.dat

The table contains selected comparison stars with positions,
magnitudes and star identifications. The sequence contain
V magnitudes and B-V colours; R magnitudes are also included
for the convenience of CCD observers. It is based on photometry
obtained on two nights (from before July 21) and the magnitudes
and colours should be accurate to within 0.01-0.02 mag. I have
only included stars that are apparently single and bluer than
B-V = +1.0.

-------------------------------------------------------------
Id.  R.A. (2000.0) Decl.  V-mag   B-V   R-mag   Star Name
     h  m   s    o  '  "
-------------------------------------------------------------
 A  20 07 09.5 +36 08 30  11.58  +0.16  11.46  TYC 2683-1666
 B  20 07 15.8 +36 05 52  11.89  +0.85  11.41  GSC 2683-2526
 C  20 07 05.5 +36 04 52  12.18  +0.22  12.01  TYC 2683-1248
 D  20 07 20.9 +36 02 58  12.55  +0.31  12.32  GSC 2683-2958
 E  20 07 38.9 +36 06 33  12.70  +0.51  12.39  GSC 2683-1418

 F  20 06 56.8 +36 05 28  13.04  +0.65  12.66  GSC 2683-1882
 G  20 07 06.0 +36 01 34  13.23  +0.54  12.89  GSC 2683-1020
 H  20 07 14.2 +36 04 36  13.59  +0.80  13.12  GSC 2683-3012
 J  20 07 16.9 +36 07 55  14.00  +0.70  13.57   (USNO-A2.0)
 K  20 07 33.2 +36 03 01  14.44  +0.59  14.09   (USNO-A2.0)
-------------------------------------------------------------

Henden's photometry of the nova gave V = 11.85, B-V = +1.60,
and R = 10.47.

                                 Yours sincerely,
                                 Bjorn H. Granslo

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