Electronic Telegram No. 2644
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


NOVA SAGITTARII 2011 = PNV J17474639-2335112
     S. Nakano, Sumoto, Japan, rpeorts the discovery by Hideo Nishimura
(Miyawaki, Kakegawa, Shizuoka-ken, Japan) of a possible nova (mag 11.2) on two
15-s CCD frames (limiting magnitude 12.5) taken on Jan. 25.86 UT using a Canon
200-mm f/3.2 lens and a Canon EOS 5D digital camera mounted on a Takahashi
EM100 equatorial telescope.  Nishimura measures the variable to be located at
R.A. = 17h47m46s.33, Decl. = -23d35'13".1 (equinox 2000.0); Nakano measures
position end figures 46s.39, 11".2 (uncertainty +/- 3") and magnitude 11.4 +/-
0.6 for the variable from Nishimura's two discovery frames (limiting mag 13.2).
The object was posted on the Central Bureau's TOCP webpage with the provisional
designation PNV J17474639-2335112.  Additional magnitudes for the variable:
2010 May-Nov., [12.5: (Nishimura; eighteen frames taken during this span);
2011 Jan. 17, 11.5 (Nishimura); 24, 11.5 (Nishimura); 27.549, B = 12.46, V =
12.38, R_c = 10.38, I_c = 9.62 (S. Kiyota, remotely using the GRAS-004 0.25-cm
reflector near Mayhill, NM, USA; position end figures 46s.11, 12".8); 27.844,
11.0 (T. Yusa, Osaki, Japan; 0.30-m f/7 Cassegrain telescope + unfiltered SBIG
STL-1001E CCD camera); 27.850, 11.1 (Yusa); 27.851, 11.2 (Ken-ichi Kadota, Ageo,
Japan, 0.25-m f/5 reflector + unfiltered SBIG ST-9E CCD camera; limiting mag
15.8; eight 10-s stacked frames; position end figures 46s.23, 13".7; via
Nakano); 27.857, 11.2 (Yusa); 27.860, 11.2 (Yusa); 27.863, 11.2 (Yusa).  Yusa
reports position end figures 46s.22, 13".7 from five stacked 30-s exposures
(limiting mag 17.0).  One of Yusa's image is posted at the following website
URL:  http://space.geocities.jp/yusastar77/PNinSgr_110128.htm.  Kadota's
images is at http://members.jcom.home.ne.jp/kenic-k/image/PNinSgr-20110127.jpg.

     Akira Arai, Koyama Astronomical Observatory, Kyoto Sangyo University,
reports that low-resolution (R about 550) spectroscopic observations of PNV
J17474639-2335112 were obtained at the Koyama Astronomical Observatory on
Jan. 28.863 UT under a hazy sky.  The spectra of the object show prominent
emission lines in H-alpha, H-beta, and O I (777.4 nm) on a highly reddened
continuum.  These features suggest that the object is a classical nova past
maximum light, highly reddened by interstellar mediums.  A spectrum is posted
at website URL http://www.cc.kyoto-su.ac.jp/~kao/blog/index.php/view/38.

     Kazuyoshi Imamura, Okayama University of Science (OUS), reports that a
low-dispersion spectrum (R about 400) of PNV J17474639-2335112 was obtained on
Jan. 28.886 UT with the 0.28-m Schmidt-Cassegrain telescope (+ DSS-7) at the
OUS Observatory, showing a clear H_alpha emission line (FWHM approximately 1300
km/s), suggesting that the object is a classical nova.  The spectrum is posted
at http://blog-imgs-32-origin.fc2.com/t/n/b/tnblab/PN_Sgr_sp20110128.png.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 January 29                  (CBET 2644)              Daniel W. E. Green