[IAUC] CBET 4086: 20150402 : NOVA OPHIUCHI 2015 = PNV J17291350-1846120

Jue Abr 2 01:34:37 ART 2015

                                                  Electronic Telegram No. 4086
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 en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


NOVA OPHIUCHI 2015 = PNV J17291350-1846120
     S. Nakano, Sumoto, Japan, reports the discovery by Yukio Sakurai (Mito,
Ibaraki-ken, Japan) of a possible nova (mag 12.2) in Ophiuchus on two 15-s
frames (limiting mag 12.5) taken on Mar. 29.766 UT using a Nikon D7100 digital
camera (+ 180-mm-f.l. f/2.8 lens); Sakurai provided the star's position as
R.A. = 17h29m13s.5, Decl. = -18d46'12" (equinox 2000.0).  Nakano measured
Sakurai's JPEG frame and determined magnitude 12.3 and position end figures
13s.43, 14".0 (probable error +/- 3"), and he posted Sakurai's image at the
following website URL:  http://www.oaa.gr.jp/~oaacs/image/PnovaOph.jpg.
The variable was designated PNV J17291350-1846120 when it was posted at the
Central Bureau's TOCP webpage.  P. Schmeer, Bischmisheim, Germany, notes
that there is a star of mag around 18 at position end figures 13s.58, 13".7
in the USNO-B1.0 catalogue.
     Additional CCD magnitudes for PNV J17291350-1846120:  Mar. 27.628 UT,
13.7 (R. Kaufman, Bright, Victoria, Australia; six frames taken with a Canon
650D camera + 200-mm-f.l. lens; green channel of DSLR image; approximate V
magnitude; image posted via website URL http://tinyurl.com/lnyn2uz); 28.766,
[12.5 (Sakurai; limiting magnitude assumed); 28.777, [12.5 (T. Kojima,
Tsumagoi, Gunma-ken, Japan; 150-mm-f.l. f/2.8 lens; communicated by Nakano);
29.781, 12.5 (Kojima); 30.419, V = 12.0 (Adriano Valvasori and Fabio
Briganti; remotely with an iTelescope 25-cm Newtonian reflector + ST-10ME
camera near Mayhill, NM, USA; two 120-s exposures; image posted at website
URL https://www.flickr.com/photos/128758169@N05/16963013056/); 30.540, V =
12.26, I_c = 11.57 (S. Kiyota, Kamagaya, Japan; remotely with an iTelescope
0.61-m f/6.5 CDK astrograph + FLI PL09000 camera at the Sierra Remote
Observatory near Auberry, CA, USA; position end figures 13s.42, 13".8; image
posted at URL http://meineko.sakura.ne.jp/ccd/PNV_J17291350-1846120.jpg);
30.639, 12.7 (T. Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 reflector;
limiting mag 15.5; position end figures 13s.42, 13".9; image posted at URL
http://park8.wakwak.com/~ngc/images/PNVinOph_20150330.jpg; communicated by
Nakano); 30.771, 11.9 (Kojima); 31.117, 12.0 (G. Masi, remotely using a 43-cm
telescope at Ceccano, Italy; position end figures 13s.41, 13".6); 31.414, V =
11.95 (J. Hambsch, Mol, Belgium, remotely at San Pedro de Atacama, Chile; via
E. O. Waagen, AAVSO); 31.568, 11.8 (Kaufman); Apr. 1.077, B = 12.71, V =
11.93, R_c = 11.38, I_c = 10.89 (Ulisse Munari, Astronomical Observatory
of Padova; and Sergio Dallaporta, ANS Collaboration); 1.117, B = 12.69, V =
11.94, R_c = 11.39, I_c = 10.90 (Munari and Dallaporta); 1.437, V = 11.94
+/- 0.03 (S. O'Connor, St. George, Bermuda; via Waagen).  A. Pearce, Nedlands,
Western Australia, reports visual mag 11.9 on Mar. 31.787.
     K. Ayani, Bisei Astronomical Observatory, writes that M. Fujii (Fujii
Kurosaki Observatory, Kurashiki, Okayama, Japan) obtained a low-resolution
spectrogram of PNV J17291350-1846120 on Mar. 30.758 UT with a 0.4-m telescope
and found Balmer lines with P-Cyg profiles; absorption minimums of H-alpha and
H-beta lines are blue-shifted by 1900 km/s with respect to the emission.
Fujii also found emission lines of He I (504.8-, 587.6-, 667.8-, and 706.5-nm),
N II (500.1-, 547.9-, 567.9-, and 593.8-nm), and possibly N III 464.0-nm and
O I 777.3-nm, adding that the variable appears to be a "He/N"-type nova.  The
spectrum is posted via website URL http://tinyurl.com/n8thf5l.
     K. Ayani, Bisei Astronomical Observatory (BAO), Ibara, Okayama, Japan,
also obtained a low-resolution spectrogram (range 400-800 nm; resolution
0.5 nm at H-alpha) of the possible nova on Mar. 30.8 UT with the BAO 1-m
telescope and confirmed Fujii's findings including N III and O I emission.
N II 423.7-nm, He I 447.1-nm, and C II 723.4-nm emission lines are also seen.
[Fe X] 637.5-nm might be present.  Most of the N II, He I, N III, O I, and
C II lines have P-Cyg profiles.  H-alpha emission line has an equivalent
width of about 6 nm.  The spectrum is posted via http://tinyurl.com/kbpoyv6.


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                         (C) Copyright 2015 CBAT
2015 April 2                     (CBET 4086)              Daniel W. E. Green