Electronic Telegram No. 3177
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


NOVA SAGITTARII 2012 No. 4 = PNV J18202726-2744263
     Kazuya Ayani, Bisei Astronomical Observatory, reports that he received
an email on July 7.95 UT from Akihiko Tago (Tsuyama, Okayama, Japan) of an
apparent independent discovery of this nova (cf. CBET 3166) at mag 7.8 on two
CCD frames taken on July 7.5500 and 7.5504 UT with a Canon EOS 5D camera (+
105-mm-f.l. f/3.2 lens), the position given as R.A. = 18h20m26s, Decl. =
-27d44'00" (equinox 2000.0).
     Toru Yusa, Osaki, Japan, reports position end figures 27s.29, 26".8
(USNO-B1.0 reference stars) for the nova from CCD frames taken on July 8.290
UT remotely with a 0.25-m f/3.4 hyperbolic astrograph (+ SBIG ST-10XME camera)
at the RAS Observatory (iTelescope network) near Mayhill, NM, U.S.A.; he also
measured magnitudes B = 8.4, V = 7.9, R_c = 7.6, I_c = 6.8.  He adds that
nothing is visible at the position of the nova on a red Digitized Sky Survey
image from 1996 Sept. 12 (limiting mag about 20).  Yusa's image is posted at
URL http://space.geocities.jp/yusastar77/supernova/nvSgr2012_4_1200708.htm.
     F. Kugel and J. Caron report magnitude 8.2 from three 30-s infrared-
filtered CCD images (limiting magnitude about 14.0; bandpass > 742 nm)
obtained on July 7.9277 UT with a 0.08-m f/5 refractor (+ ST8300M camera)
operated remotely from the Chante-Perdrix-Dauban Observatory near Banon,
France.  The nova was measured to be located at R.A. = 18h20m27s.24, Decl. =
-27d44'27".0 (equinox 2000.0; USNO-B1.0 reference stars). Nothing is present
at this position on their images of the same field taken on June 28.0171
(limiting magnitude about 14.0).
     Christian Buil, Castanet, France, writes that a spectrogram of PNV
J18202726-2744263, taken with a LISA spectrograph and a 0.10-m refractor
(spectral resolution 0.8 nm) on July 8.962 UT shows the characteristics of a
typical "Fe II" nova.  The H-alpha FWHM is measured at 1700 km/s.  The
spectrum is posted at http://www.astrosurf.com/buil/nova_sgr2012_4/obs.htm.
     Visual magnitude estimates for the nova:  July 8.801 UT, 8.6 (Jose G. de
S. Aguiar, Campinas, Brazil); July 11.021, 8.3 (Willian Souza, Sao Paulo,
Brazil); 13.951, 8.4 (Souza).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2012 CBAT
2012 July 15                     (CBET 3177)              Daniel W. E. Green