Electronic Telegram No. 4389
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
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Prepared using the Tamkin Foundation Computer Network


NOVA IN OPHIUCHUS = TCP J17394608-2457555
     K. Itagaki, Yamagata, Japan, reports his discovery of an apparent nova
on an unfiltered CCD image taken on May 8.638 UT with a 0.20-m f/3 reflector
and then confirmed on an image taken with a 0.50-m reflector on May 8.751;
the latter image produced magnitude 13.6 and position R.A. = 17h39m46s.08,
Decl. = -24d57'55".5 (equinox 2000.0).  He has posted his discovery image at
website URL http://k-itagaki.jp/images/oph-pn.jpg.  The variable received the
provisional designation TCP J17394608-2457555 when it was posted at the
Central Bureau's TOCP webpage.
     Additional CCD magnitudes for TCP J17394608-2457555 reported to the
Central Bureau:  May 9.404 UT, V = 14.64, I_c = 11.80 (S. Kiyota, Kamagaya,
Japan, using a 0.61-m f/6.5 CDK astrograph at Auberry, CA, USA, remotely;
image posted at http://meineko.sakura.ne.jp/ccd/TCP_J17394608-2457555.jpg);
9.527, R = 13.8 (S. Foglia, L. Buzzi, P. Concari, C. Cremaschini, G. Galli,
and M. Tombelli, using an iTelescope 0.18-m f/2.8 reflector at Siding
Spring Observatory, NSW, Australia; image posted at website URL
http://www.asteroids.altervista.org/obs/TCPJ17394608-2457555.gif); 10.561,
V = 15.0, I = 11.5 (K. Yoshimoto, Yamaguchi-ken, Japan, using a 0.50-m f/6.8
reflector at Siding Spring, NSW, Australia, remotely; position end figures
46s.09, 55".1; communicated by S. Nakano; image posted at website URL
http://orange.zero.jp/k-yoshimoto/TCP_J17394608-2457555_20170510.jpg).
P. Schmeer, Saarbruecken-Bischmisheim, Germany, writes that nothing is
visible at the position of the variable in Digitized Sky Survey images,
adding that it is located in a dust-rich region of the Milky Way and may
be considerably reddened.
     S. C. Williams, Physics Department, Lancaster University; and M. J.
Darnley, Liverpool John Moores University, report that a spectrogram taken
on May 11.15 UT with the FRODOSpec spectrograph on the Liverpool Telescope
at La Palma is consistent with a nova shortly after peak brightness.  The
spectrum shows H-alpha (FWHM = 1400 km/s), O I 777.4-nm, C I 711.5-nm, [O I]
630.0-nm and 636.4-nm, and Fe II lines at 614.8, 624.8, and 645.6 nm.  All
of these are seen in emission, with the O I 777.4-nm line also showing a
strong P-Cyg absorption component.  This spectrum confirms that TCP
J17394608-2457555 is a nova and a member of the "Fe II" spectroscopic type.
The spectrum is consistent with that of a nova within about 2 magnitudes of
peak, and the red continuum implies significant reddening.


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

                         (C) Copyright 2017 CBAT
2017 May 13                      (CBET 4389)              Daniel W. E. Green