[IAUC] CBET 4150: 20151014 : NOVA OPHIUCHI 2015 No. 2 = TCP J17344775-2409042

Mie Oct 14 11:46:06 ART 2015

                                                  Electronic Telegram No. 4150
Central Bureau for Astronomical Telegrams
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NOVA OPHIUCHI 2015 No. 2 = TCP J17344775-2409042
     Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan,
report their discovery of a new variable star (mag 11.8) on two 40-s
unfiltered CCD frames (limiting magnitude 13.3) taken around Oct. 11.4129 UT
using a 135-mm-f.l. f/4 camera lens (+ FLI 09000 camera).  Four confirming
40-s unfiltered CCD frames (limiting magnitude 18.1) taken around Oct 11.473
using a 0.50-m f/6.8 reflector (+ FLI 1001E camera) yield magnitude 11.8 and
the following precise position:  R.A. = 17h34m47s.75, Decl. = -24d09'04".2
(equinox 2000.0; reference stars from GSC-ACT catalogue).  Nothing is visible
at this position on the Digitized Sky Survey.  The variable was designated
TCP J17344775-2409042 when it was posted at the Central Bureau's TOCP
webpage.  Additional CCD magnitudes for TCP J17344775-2409042:  Oct. 7.405,
[13.4 (Nishiyama and Kabashima); 11.394, 12.0 (T. Kojima, Tsumagoi,
Gunma-ken, Japan; pre-discovery observation; Canon EOS D60 camera +
135-mm-f.l. f/2.8 lens; communicated by S. Nakano, Sumoto, Japan); 11.415,
12.1 (Shigehisa Fujikawa, Kan'onji, Kagawa, Japan; independent discovery;
Minolta 120-mm-f.l. f/3.5 camera lens; position end figures 47s.36, 06".6;
communicated by M. Soma, National Astronomical Observatory of Japan); 11.490,
11.7 (Fujikawa; 400-mm-f.l. lens; position end figures 47s.77, 03".7); 11.721,
11.2 (G. Masi; remotely using a 43-cm telescope near Ceccano, Italy; position
end figures 47s.74, 04".0); 12.071, V = 11.89 (S. O'Connor, St. George,
Bermuda; communicated by E. O. Waagen, American Association of Variable Star
Observers); 12.090, B = 13.65, V = 12.04, R_c = 11.12, I_c = 10.09 (S.
Kiyota, Kamagaya, Japan; remotely with an iTelescope 0.50-m f/4.5 CDK
astrograph + FLI-PL11002M camera near Mayhill, NM, USA; image posted at
URL http://meineko.sakura.ne.jp/ccd/TCP_J17344775-2409042.jpg); 13.407, V =
12.9 (T. Yusa, Osaki, Japan; remotely using an iTelescope 0.43-m f/6.8
astrograph at Siding Spring; position end figures 47s.74, 03".7; image posted
at URL http://space.geocities.jp/yusastar77/supernova/NVinOph_151013.htm).

     K. Ayani, Bisei Astronomical Observatory, forwards a report by Mitsugu
Fujii (Kurashiki, Okayama, Japan), who obtained a spectrogram of TCP
J17344775-2409042 on Oct. 12.421 UT with a 0.4-m telescope, in which he found
an H-alpha emission line with a P-Cyg profile, from which he estimated an
expansion velocity of about 700 km/s.  He also noted a very deep Na I D
absorption line whose equivalent width was about 1.1 nm, and the spectrum
implies heavy interstellar reddening.  Fujii's spectrogram is posted at
website URL http://otobs.org/FBO/etc/tcp_oph.htm.


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                         (C) Copyright 2015 CBAT
2015 October 14                  (CBET 4150)              Daniel W. E. Green