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IAUC 9278: V1831 Aql = N Aql 2015 = PNV J19215012+1509248

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                                                  Circular No. 9278
Central Bureau for Astronomical Telegrams
New postal address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


V1831 AQUILAE = NOVA AQUILAE 2015 = PNV J19215012+1509248
     S. Nakano, Sumoto, Japan, reports the discovery by by K.
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 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. = +15o09'24".8 (equinox 2000.0).  The variable
was designated PNV J19215012+1509248 when it was posted at the
Central Bureau's TOCP webpage.  E. Kazarovets and N. Samus note
that the permanent GCVS designation V1831 Aql has been assigned to
this variable.
     Additional CCD magnitudes for V1831 Aql:  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; details given at website 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 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; 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); 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 V1831
Aql on Oct. 5.598 and 6.482 UT with a 40-cm telescope.  The spectra
show strong H_alpha emission line with FWHM 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.
     Additional details are given on CBET 4147.

                      (C) Copyright 2015 CBAT
2015 October 8                 (9278)            Daniel W. E. Green

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