Electronic Telegram No. 3182
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 2012 No. 5 = PSN J18193700-1907400
     S. Nakano, Sumoto, Japan, reports the discovery by Tadashi Kojima
(Tsumagoi, Agatsuma-gun, Gunma-ken, Japan) of a possible nova (mag 12.6)
on two frames (limiting magnitude 14) taken on July 16.512 UT using a Canon
EOS 40D camera (+ 150-mm f/2.8 lens) mounted on a Sky-memo auto equatorial
telescope.  The new variable is located at R.A. = 18h19m37s.0, Decl. =
-19d07'40" (equinox 2000.0); nothing was visible at this position on Kojima's
earlier patrol frames taken with the same instrumentation on 2011 Apr. 9.746,
July 5.514, Sept. 23.427, 2012 Mar. 25.789, Apr. 14.718, May 23.687, and June
22.547 (limiting mag 13.5).  The variable was designated PSN J18193700-1907400
when it was posted at the Central Bureau's TOCP webpage.  Additional magnitudes
for the new object:  1991 Aug. 30, [19 (Toru Yusa, Osaki, Japan; red Digitized
Sky Survey plate); 2012 June 27.629, [13.5 (Kojima); July 17.598, 12.2
(Kojima); July 17.993, V = 12.7 (Yusa; remotely using a 0.43-m f/6.8
astrograph + SBIG STL-11000M camera at the AstroCamp Observatory near Nerpio,
Spain; limiting mag about 16; position end figures 36s.94, 40".2; reference
stars from USNO-B1.0 catalogue; image posted at the following website URL:
http://space.geocities.jp/yusastar77/supernova/pnvinSgr_120718.htm); July
18.282, B = 14.34, V = 12.71, R_c = 11.15, I = 9.96 (Yusa; Landolt equatorial
standards; position end figures 36s.95, 40".3; remotely using a 0.25-m f/3.4
hyperbolic astrograph + SBIG ST-10XME camera at the RAS Observatory,
iTelescope network, near Mayhill, NM, U.S.A.; limiting magnitude about
16.5); July 18.520, I_c = 9.92 (Hiroyuki Maehara, Kwasan Observatory, Kyoto
University, 0.25-m telescope); July 18.522, R_c = 11.18 (Maehara); July
18.524, V = 12.45 (Maehara); July 18.527, B = 14.11 (Maehara).

     Kazuyoshi Imamura and Minako Ogi, Okayama University of Science (OUS),
report obtaining a low-resolution spectrogram (R about 400) of PNV
J18193700-1907400 on July 18.529 UT, using the DSS-7 spectrometer attached to
the 0.28-m Schmidt-Cassegrain telescope at the OUS observatory.  The spectrum
shows an H-alpha emission line on a reddened continuum.  The FWHM of H-alpha
is approximately 1000 km/s.  From this result, the variable is thought to be
a classical nova.  The spectrum has been posted at the following website URL:
http://tnblab.blog7.fc2.com/blog-entry-321.html.

     Kazuya Ayani, Bisei Astronomical Observatory, reports that M. Fujii
(Kurashiki, Okayama, Japan) obtained a low-resolution spectrogram of PNV
J18193700-1907400 on July 18.572 UT with a 40-cm telescope.  Fujii notes that
the spectrum shows emission lines of H-alpha, H-beta, H-gamma, Fe II
(multiplets 37, 42, 74), and He I (587.6 and 667.8 nm), an absorption line of
Na I D (equivalent width 0.2 nm), and DIB absorption (628.4 nm, equivalent
width 0.33 nm).  The H-alpha emission line has a FWHM of 940 km/s.  Fujii also
notes that this object may have strong interstellar absorption, judging from
the slope of the continuum, adding that the variable may be a "Fe II"-type
nova.  Fujii's spectrum is posted at the following website URL:
http://otobs.org/FBO/novae/pnv_j18193700-1907400.htm.


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

                         (C) Copyright 2012 CBAT
2012 July 19                     (CBET 3182)              Daniel W. E. Green