Central Bureau for Astronomical Telegrams
IAUC 9196: V5587 Sgr = N Sgr 2011
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Circular No. 9196
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
New postal address: Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
CBATIAU@EPS.HARVARD.EDU ISSN 0081-0304
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
V5587 SAGITTARII = NOVA SAGITTARII 2011
As first announced on CBET 2644, S. Nakano (Sumoto, Japan)
reports 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. = -23o35'13".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 measures position end figures 46s.22,
13".7 from five stacked 30-s exposures (limiting mag 17.0).
Hiroyuki Maehara (Kwasan Observatory, Kyoto University) reports
the following magnitudes for the nova from CCD images obtained with
a 0.25-m telescope at Kwasan Observatory: Jan. 28.8774 UT, I_c =
10.15; 28.8786, V = 11.93.
A. Arai, Koyama Astronomical Observatory (KAO), Kyoto Sangyo
University, writes that low-resolution (R about 550) spectra,
obtained at the KAO on Jan. 28.863 UT under a hazy sky, 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 the
interstellar medium. K. Imamura, Okayama University of Science
(OUS), notes that a low-dispersion spectrum (R about 400) 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), again suggesting that
the object is a classical nova. Elena Kazarovets, on behalf of the
GCVS team, reports that the permanent designation V5587 Sgr has
been assigned to this nova.
(C) Copyright 2011 CBAT
2011 February 5 (9196) Daniel W. E. Green
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