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THE ASTRONOMER Electronic Circular No 3120      2015 Nov 06 18.03UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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NOVA SAGITTARII 2015 No. 4 = PNV J18225925-1914148
Shigehisa Fujikawa (Kagawa, Japan) reports discovery of a variable star (mag
11.8) on a 60-s CCD frame taken on 2015 Oct. 31.38UT using a Minolta f/3.5
120-mm-f.l. camera lens (+ BITRAN BN-51LN camera); the position of the
variable was given as 
RA 18h 22m 59.33s DEC -19 14'06.8" (2000).  A follow-up 30-s exposure by
Fujikawa from a frame taken with a 400-mm-f.l. lens on Oct. 31.406 yielded
mag 11.7 and position end figures 59s.29, 12".3.  

An independent discovery was made as a nova-like object of mag 11.5 by Hideo
Nishimura (Shizuoka-ken, Japan) from four 30-s frames (limiting magnitude
about 13) taken on Oct. 31.376 using a 200-mm.-f.l. f/3.2 lens with a Canon
EOS 5D digital camera, the position end figures given as 59s.25, 14".8.
Minoru Yamamoto (Okazaki, Aichi-ken, Japan) also reported his independent
discovery of this object at mag 11.0 on three frames taken on Oct.31.392
using a 135-mm-f.l. f/3.5 lens with a Canon EOS 5D digital camera, providing
position end figures 59s.10, 15" (uncertainty +/- 5").  The discovery image
by Nishimura was posted at the following website:
http://www.oaa.gr.jp/~oaacs/image/PNinSgr20151031.jpg.  

Additional CCD magnitudes: Oct 31.706, 11.3 (G. Masi; remotely using a 43-cm
telescope at Ceccano, Italy; position end figures 59s.29, 12".8); Nov.
1.053, B = 14.30, V = 12.96, R_c = 11.63 and I_c = 10.28 (S. Kiyota,
Kamagaya, Japan; remotely with an iTelescope 0.50-m CDK astrograph near
Mayhill, NM, USA)

M. Fujii, Japan, obtained spectrograms (R about 500 at H-beta) on Nov. 2.417
and 3.389 UT with a 0.4-m telescope, finding a strong and broad H-alpha
emission line, an H-beta emission line, He I (501.6-, 587.6-, and 706.5-nm)
emission lines, and an N II (567.9-nm) emission line on both nights.  The
FWHMs of the H-alpha line, measured by spectra are posted at URL
http://otobs.org/FBO/etc/pnv_j18225925-1914148.htm.

U. Munari, Istituto Nazionale di Astrofisica, Padova Astronomical
Observatory; and U. Sollecchia, Asiago Novae and Symbiotic Stars (ANS)
collaboration, report that on Nov 2.758 UT they obtained a long-exposure,
low-resolution spectrogram. The object shows a feeble red continuum
superimposed with a very broad H-alpha feature in emission, with a nearly
Gaussian profile characterized by FWHM = 5100 km/s, which suggests the
transient to be a nova.  Munari adds that he also obtained a low-resolution
spectrogram with the Asiago 1.22-m telescope.  The spectrum shows strong
emission lines of hydrogen Balmer, He I (501.6-, 587.6, and 706.5-nm), and N
II (465.1- and 568.0-nm), appearing on top of a highly reddened continuum;
their FWHM is measured to be 4000 km/s, causing He I 667.8-nm to be
overwhelmed by the H-alpha red wing.  The object has the typical spectrum of
a He/N nova.

Guy M Hurst