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@eps.harvard.edu (alternate cbat@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. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2015 CBAT 2015 April 2 (CBET 4086) Daniel W. E. Green