[IAUC] CBET 3273: 20121026 : POSSIBLE NOVA IN AQUILA = PNV J18523496-0018423

Vie Oct 26 08:58:01 ART 2012

                                                  Electronic Telegram No. 3273
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


POSSIBLE NOVA IN AQUILA = PNV J18523496-0018423
     Koichi Nishiyama, Kurume, Japan; and Fujio Kabashima, Miyaki, Japan,
report their discovery of a possible nova (mag 12.6) on two 40-s unfiltered
CCD frames (limiting magnitude 13.8) taken around Oct. 20.429 UT using a
105-mm f/4 camera lens (+ SBIG STL6303E camera); they confirmed the new object
on five 3-s unfiltered CCD frames (limiting magnitude 18.5) taken around Oct.
20.435 using a Meade 200R 0.40-m f/9.8 reflector (+ SBIG STL1001E camera).
The new object is located at R.A. = 18h52m34s.96, Decl. = -0deg18'42".3
(equinox 2000.0).  The variable was designated PNV J18523496-0018423 when it
was posted at the Central Bureau's TOCP webpage.  Additional CCD magnitudes
for the new variable (unfiltered unless noted otherwise):  Oct. 12.470, [14.1
(Nishiyama and Kabashima); 14.472, [14.1 (Nishiyama and Kabashima); 15.428,
13.2 (Nishiyama and Kabashima; pre-discovery; limiting mag 14.1); 18.434, 12.3
(Nishiyama and Kabashima; pre-discovery; limiting mag 14.1); 19.421, 12.1 (A.
Takao, Kitakyushu, Japan; 100-mm f/4 camera lens + STL-6303E camera; apparent
pre-discovery); 19.434, 12.2 (Nishiyama and Kabashima; pre-discovery); 20.524,
12.1 (T. Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain
reflector + BITRAN BT-11E camera; limiting mag 15.0; position end figures
34s.95, 42".7; communicated by S. Nakano, Sumoto, Japan; image posted at
website URL http://park8.wakwak.com/~ngc/images/PNV_J18523496-0018423.jpg);
20.730, 11.4 (Gianluca Masi, Francesca Nocentini, and Patrick Schmeer;
remotely imaged with the 43.2-cm f/6.8 reflector of the Virtual Telescope
Project at Ceccano, Italy; position end figures 34s.98, 42".4; reference
stars from the NOMAD catalogue); 20.871, 11.2 (Luca Buzzi and Federica Luppi,
Varese, Italy; 0.38-m f/6.8 reflector; position end figures 34s.96, 42".5;
reference stars from the UCAC-4 catalogue; image posted at website URL
http://www.astrogeo.va.it/pub/TOCP/PNV_J18523496-0018423.jpg); 21.057, B =
17.31, V = 14.10, R_c = 12.11, I_c = 10.23 (Seiichiro Kiyota, Tsukuba, Japan;
remotely with a 43-cm astrograph + FLI PL-6303E CCD camera of the iTelescope
network near Mayhill, NM, USA); 21.071, V = 13.2 +/- 0.1 (R. A. Koff, Bennett,
CO, USA; Meade 0.25-m f/10 reflector + Apogee U-47 camera; limiting magnitude
15.8; position end figures 34s.99, 42".5; UCAC3 reference stars; nearest star
located at position end figures 34s.91, 42".5; little variation beyond error
range of +/- 0.03 mag in 45 min of monitoring; image posted at website URL
http://antelopehillsobservatory.org/SNpictures/PNVJ18523496-0018423final.jpg);
22.128, V = 14.43 (Gustav Holmberg, Lund, Sweden; remotely using a Sierra Stars
0.37-m Cassegrain reflector located at the Winer Observatory near Sonoita, AZ,
U.S.A.); 22.762, 11.8 (Masi et al.); 26.129, B = 17.2, V = 14.51, R_c = 12.50,
I_c = 9.98 (T. Yusa, Osaki, Japan; remotely using a 0.25-m f/3.4 hyperbolic
astrograph + SBIG ST-10XME camera at the RAS Observatory, iTelescope network,
near Mayhill; image posted at the following website URL:
http://space.geocities.jp/yusastar77/supernova/nvAqr2012_121026.htm.

      Ulisse Munari, Istituto Nazionale di Astrofisica, Padova Astronomical
Observatory, writes that a spectrogram (0.23 nm/pixel; range 400-750 nm) was
obtained of this variable with the Asiago 1.22-m telescope on Oct. 21.82 UT.
The object has a very red continuum, with strong Na I 589.3-nm and Ba II
649.6-nm in absorption, and a weak and sharp H_alpha in emission with a
possible very narrow absorption component blue-shifted by 250 km/s with
respect to the emission line.  The spectrum looks more like that of an
outbursting pre-main-sequence young stellar object than that of a nova
caught before maximum brightness.

     Kazuya Ayani, Bisei Astronomical Observatory, reports that M. Fujii
(Kurashiki, Okayama, Japan) obtained a spectrogram of PNV J18523496-0018423
on Oct. 21.419 UT with 0.4-m telescope at the Fujii Kurosaki Observatory and
found that its H-alpha emission had a P-Cyg profile; the difference between
the absorption bottom and the emission peak being about 500 km/s.  He also
found a Na I D absorption line whose equivalent width is about 0.6 nm, noting
also that the slope of the continuum indicates heavy interstellar reddening.
His spectrum is posted at the following website URL:
http://otobs.org/FBO/etc/pnv_j18523496-0018423_20121021.gif.

     K. Ayani, Bisei Astronomical Observatory (BAO), Ibara Okayama, Japan,
obtained a low-resolution spectrogram (range 400-800 nm; resolution 0.5 nm at
H-alpha) of PNV J18523496-0018423 on Oct. 23.5 UT with the BAO 1-m telescope.
The spectrum shows prominent H-alpha emission (EW about 5 nm) on a red
continuum. O I 777.3-nm emission with a P-Cyg profile and Fe II 624.8-nm
(multiplet 74) emission are also seen.  It resembles that of a nova of early
phase.  The spectrum is posted at the website URL http://tinyurl.com/953jdfl.


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

                         (C) Copyright 2012 CBAT
2012 October 26                  (CBET 3273)              Daniel W. E. Green