[IAUC] CBET 4147: 20151008 : NOVA AQUILAE 2015 = PNV J19215012+1509248

Jue Oct 8 01:21:50 ART 2015

                                                  Electronic Telegram No. 4147
Central Bureau for Astronomical Telegrams
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Prepared using the Tamkin Foundation Computer Network


NOVA AQUILAE 2015 = PNV J19215012+1509248
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata, Japan) of a nova-like object (mag 12.4) on an unfiltered
CCD frame taken on Oct. 5.548 UT using a 0.21-m f/3.0 reflector; Itagaki
confirmed the variable on five unfiltered CCD frames taken around Oct. 5.557
with a 0.50-m f/6 reflector, yielding the following precise position:  R.A. =
19h21m50s.12, Decl. = +15d09'24".8 (equinox 2000.0; reference stars from UCAC4
catalogue.  Itagaki adds that nothing is visible at this position on his past
survey frames, but there is no recent available frame; his discovery image is
viewable via website URL http://tinyurl.com/pwrm9k2.  The variable was
designated PNV J19215012+1509248 when it was posted at the Central Bureau's
TOCP webpage.
     Additional CCD magnitudes for the new variable:  Sept. 12.35 UT, [17.2
(B. J. Shappee et al.; images taken with the 14-cm "Brutus" telescope at
Haleakala in the course of the All-Sky Automated Survey for Supernovae; cf.
URL http://www.astronomerstelegram.org/?read=8126); 21.452, [12: (H. Maehara,
Okayama Astrophysical Observatory; SBIG ST-8XME CCD camera + 105-mm-f.l.
camera lens at the OAO in the course of the Kamogata-Kiso-Kyoto Wide-field
Survey); 27.409, 10.5 (T. Kojima, Gunma, Japan; pre-discovery image obtained
with a Canon EOS 60D camera + 135-mm-f.l. lens + Astronomik Planet Infrared
Pro 742 filter; communicated via Maehara); 29.31, 14.7: (Shappee et al.;
pre-discovery; images taken in poor conditions); 29.451, I_c = 10.2 (Maehara;
pre-discovery image; nothing visible on V-band images taken at the same time
to limiting mag 13.1); Oct. 1.29, V = 15.2: (Shappee et al.; independent
discovery claimed via posting a half day after Itagaki posted the object on
the TOCP); 2.435, I_c = 10.5 (Maehara); 5.428, I_c = 10.9 (Maehara); 6.4145,
V = 15.7: (K. Hirosawa, Aichi, Japan; 13-cm refractor + SBIG ST-8XME camera;
close to detection limit; communicated via Maehara); 6.4155, R_c = 13.15
(Hirosawa); 6.4162, I_c = 10.97 (Hirosawa); 6.452, 13.5 (T. Noguchi, Katori,
Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain reflector; position end
figures 50s.13, 25".3; communicated by Nakano; image viewable via website URL
http://tinyurl.com/pzk5mfw); 6.455, I_c = 11.0 (Maehara).
     Maehara adds that M. Fujii (Okayama, Japan) obtained low-resolution
spectra (range 400-900 nm; R = 600 at H-alpha) of the novalike variable on
Oct. 5.598 and 6.482 UT with a 40-cm telescope.  The spectra show strong
H-alpha emission line with FWHM of about 1600 km/s.  Fe II (74) 624.8- and
645.6-nm, Fe II (73) 730.8-nm, O I 777.3-nm, Ca II 825.1-nm (and/or Mg II
823.2-nm), O I 844.6-nm, Ca II 849.8-nm, and [O I] 630.0-nm lines are seen in
emission.  C I 711.5-nm and C II 723.5-nm emission lines may be present.
Fujii's spectra can be viewed via website URL http://tinyurl.com/qbllf74.


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                         (C) Copyright 2015 CBAT
2015 October 8                   (CBET 4147)              Daniel W. E. Green