Electronic Telegram No. 4265
Central Bureau for Astronomical Telegrams
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NOVA OPHIUCHI 2016 = PNV 17355050-2934240
     H. Yamaoka, Kyushu University, reports the discovery of a possible nova
(mag about 10.6) by Minoru Yamamoto (Okazaki, Aichi, Japan) on four 15-s
frames (limiting mag about 12.7) taken during Mar. 11.801-11.818 UT with a
Canon 5DMRK2 camera (+ 135-mm-f.l. lens).  The position was given as R.A. =
17h35m50s.5, Decl. = -29d34'24" (equinox 2000.0; uncertainty +/- 5").  The
variable was designated PNV 17355050-2934240 when it was posted at the
Central Bureau's TOCP webpage.  Yamaoka also reports the independent
discovery of PNV J17355050-2934240 (at mag about 10.6) by Yuji Nakamura
(Kameyama, Mie, Japan) on a 30-s CCD image (limiting mag about 14.0) taken on
Mar. 11.832 using a 135-mm-f.l. lens; Nakamura provided position end figures
51s.1, 22" for the variable.
     Additional magnitudes for PNV 17355050-2934240:  Feb. 10.837, [11.0
(Yamamoto); Mar. 1.849, [13.5 (Nakamura); 7.817, [13.0 (T. Kojima, Tsumagoi,
Gunma-ken, Japan; Canon EOS 6D camera + 200-mm-f.l. f/2.8 lens; communicated
by S. Nakano, Sumoto, Japan); 9.827, 12.6 (Kojima; two pre-discovery survey
frames; limiting magnitude 13.3; position end figures 50s.56, 19".0 and
magnitude 13.8 measured by Nakanofrom a JPEG image, with estimated
uncertainty +/- 2"); 12.461, V = 10.99, I_c = 8.38 (S. Kiyota, Kamagaya,
Japan; remotely with an iTelescope 0.25-m f/3.4 astrograph + SBIG ST-10XME
camera at Mayhill, NM, USA; position end figures 50s.41, 24".0; image posted
at website URL http://meineko.sakura.ne.jp/ccd/PNV_J17355050-2934240.jpg);
15.771, 10.9 (Y. Sakurai, Mito, Ibaraki-ken, Japan; two 15-s exposures with
a 180-mm-f.l. f/2.8 lens + Nikon D7100 digital camera; limiting mag 13.0;
position end figures 50s.5, 26"; communicated by Nakano).  Visual magnitude
estimates for PNV J17355050-2934240 from A. Pearce, Nedlands, W. Australia:
Mar. 12.791, 11.7; 13.831, 11.8.

     U. Munari, Istituto Nazionale di Astrofisica, Padova Astronomical
Observatory; and F.-J. Hambsch and A. Frigo, Asiago Novae and Symbiotic Stars
(ANS) collaboration, report the following photometry for PNV J17355050-2934240:
Mar. 12.400 UT, V = 10.81, B-V = +2.42, V-I = +2.68; 13.328, 10.84, +2.58,
+2.81; 14.326, 11.32, +2.64, +3.12 (uncertainties not exceeding 0.01 in all
bands).  The object is very red and suffers from Galactic extinction, wiht
E(B-V) > 2 magnitudes for a nova caught close to maximum brightness.  Munari
adds that a very noisy spectrogram, obtained on Mar. 14.15 by U. Sollecchia
(ANS collaboration) with a 20-cm telescope in central Italy (600 lines/mm)
through clouds, shows a continuum that is very red, confirming the very red
photometric colors, with a broad H_alpha emission line sitting on the
continuum; the FWHM of the hydrogen line is about 1400 km/s, and a P-Cyg
absorption appears at -950 km/s from the emission.  Overall, this is the
spectrum of a nova.


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                         (C) Copyright 2016 CBAT
2016 March 16                    (CBET 4265)              Daniel W. E. Green