Electronic Telegram No. 4145
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
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Prepared using the Tamkin Foundation Computer Network


NOVA SAGITTARII 2015 No. 3 = PNV J18033275-2816054
     S. Nakano, Sumoto, Japan, reports the discovery by K. Itagaki (Teppo-cho,
Yamagata, Japan) of an apparent nova (mag 9.9) on an unfiltered CCD frame
taken on Sept. 27.429 UT using a 180-mm-focal-length camera lens; unfiltered
confirming CCD images taken by Itagaki at the same time with a 0.50-m f/6
reflector yield the following position:  R.A. = 18h03m32s.75, Decl. =
-28d16'05".4 (equinox 2000.0; reference stars from UCAC4 catalogue).  The
discovery image was posted at URL http://www.k-itagaki.jp/images/pn-sgr.jpg.
The variable was designated PNV J18033275-2816054 when it was posted at the
Central Bureau's TOCP webpage.
     Additional CCD magnitudes for the variable:  Sept. 20.438 UT, [13.0
(Itagaki); 23.420, [12.5 (Y. Nakamura, Kameyama, Mie, Japan; camera apparently
with a 135-mm-f.l. f/4 lens; communicated by H. Yamaoka, Kyushu University);
27.404, 9.5 (T. Kojima, Tsumagoi, Gunma-ken, Japan; pre-discovery image; Canon
EOS 60 camera + 135-mm-f.l. f/2.8 lens + infrared filter; image posted at
website URL http://www.oaa.gr.jp/~oaacs/image/Pnova_Sgr_Kojima.jpg;
communicated by Nakano); 27.418, 27.420, 9.7 (Y. Sakurai, Mito, Ibaraki-ken,
Japan; pre-discovery image; Nikon D7100 + 180-mm-f.l. f/2.8 lens; communicated
by Nakano); 27.441, 9.3 (K. Nishiyama, Kurume, Japan; 0.50-m f/6.8 reflector
+ FLI 1001E camera; limiting mag 16.5; position end figures 32s.74, 05".6;
star of mag 20 noted at position end figures 32s.70, 05".7 in VizieR
catalogue); 27.447, 10.5 (A. Takao, Kitakyushu, Japan; independent discovery
reported after posting on TOCP webpage; position end figures 33s.6, 10";
image posted at URL https://sites.google.com/site/akitakao001/); 27.483, 9.6
(R. Kaufman, Bright, Victoria, Australia; digital SLR camera + 200-mm-f.l.
lens in strong moonlight; image posted via URL http://tinyurl.com/nr4xfw4);
27.483, 9.8 (T. Noguchi, Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain
reflector; position end figures 32s.75, 05".4; communicated by Nakano; image
posted at URL http://park8.wakwak.com/~ngc/images/PNVinSgr_20150927.jpg);
28.082, B = 9.77, V = 9.18, R_c = 8.83 and I_c = 8.48 (S. Kiyota, Kamagaya,
Japan; remotely with a 0.43-m f/4.5 CDK astrograph + FLI-PL6303E camera near
Mayhill, NM, USA); 28.4, 9.5 (E. Guido; remotely with an iTelescope 0.43-m
f/6.8 astrograph at Siding Spring; position end figures 32s.77, 05".3;
UCAC-4 catalogue; image posted at website URL http://bit.ly/1FwPd8O; animated
comparison with Palomar Sky Survey blue plate from 1958 Apr. 18 posted at URL
http://bit.ly/1NXp7wN).  Yamaoka adds that Y. Nakamura also reported an
independent discovery of this variable on CCD images taken on Sept. 27.419
with a 135-mm-f.l. camera lens (no magnitude or position provided).
     Visual magnitude estimates for PNV J18033275-2816054:  Sept. 27.50 UT,
10.2 (P. Camilleri, Warners Bay, NSW, Australia; communicated by E. O. Waagen,
AAVSO; variable noted as red); 27.629, 9.7 (A. Pearce, Nedlands, Western
Australia); 27.786, 9.5 (P. Schmeer, Bischmisheim, Germany); 28.038, 9.7 (J.
Bortle, Stormville, NY; communicated by Waagen); 28.478, 9.0 (Pearce;
moonlight); 28.736, 8.7 (D. Blane, Henley-on-Klip, South Africa; communicated
by Waagen); 29.477, 9.5 (Pearce; communicated by Waagen); 29.714, 9.2 (Blane).
     K. Ayani, Bisei Astronomical Observatory, reports that a spectrogram
(resolution about 500 at H-beta) taken of PNV J18033275-2816054 by M. Fujii
(Kurashiki, Okayama, Japan) with a 0.4-m telescope on Sept. 27.487 UT shows
Balmer emission lines, with the H-beta line having a P-Cyg profile that
indicates an expansion velocity of about 1100 km/s.  Emission lines of Fe II
(37), (42), and (49) also have P-Cyg profiles.  The Na D absorption is
remarkable.  The spectrogram can be viewed at the following website URL:
http://otobs.sakura.ne.jp/FBO/fko/nova/pnv_j18033275-2816054.htm.
     O. Garde, Chabons, France, writes that he obtained nine 600-s echelle
spectrograms (resolution R = 11000) of PNV J18033275-2816054 with a 40-cm
Ritchey-Chretien telescope (+ ATIK 460EX CCD camera) on Sept. 29.768 UT.
H-alpha shows a P-Cyg profile with an indicated radial velocity of about 870
km/s.  The spectrogram can be viewed at the following website URL:
http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=1264.


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

                         (C) Copyright 2015 CBAT
2015 September 30                (CBET 4145)              Daniel W. E. Green