[IAUC] CBET 3124: 20120526 : NOVA OPHIUCHI 2012 No. 2 = PNV J17395600-2447420

Vie Mayo 25 19:17:04 ART 2012

                                                  Electronic Telegram No. 3124
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


NOVA OPHIUCHI 2012 No. 2 = PNV J17395600-2447420
     John Seach, Chatsworth Island, NSW, Australia, reported his discovery of
a possible nova (mag 10.5) on six images (limiting mag 11.0) taken on May
19.484 UT with a digital SLR camera (+ 50-mm f/1.0 lens).  The object was
measured to be located at R.A. = 17h39m56s, Decl. = -24d47'42" (equinox
2000.0); Seach adds that nothing is visible at this position on the Digitized
Sky Survey (red image, but no date or limiting magnitude provided).  The
variable was designated PNV J17395600-2447420 when it was posted at the
Central Bureau's TOCP webpage.  Additional magnitudes for the variable:  May
17.525, [12.5: (Rob Kaufman, Bright, Victoria, Australia; digital SLR camera);
18.488, [11.0 (Seach); 18.614, [14: (Seiichiro Kiyota, Tsukuba, Japan; 85-mm
f/2 camera lens + ST-10XME CCD camera + I_c filter); 18.735, [13.2 (Akira
Takao, Kitakyushu, Japan; 100-mm f/4 camera lens + STL-6303E camera);
19.679, 10.6 (Kaufman; new object visible about 0'.7 northeast of Seach's
position); 20.3, 9.5 (Ernesto Guido, Giovanni Sostero, and Nick Howes;
remotely with a 0.43-m f/6.8 astrograph of the RAS Observatory near Mayhill,
NM, U.S.A.; position end figures 57s.00, 07".3; reference stars from CMC-14
catalogue; an animation showing a comparison between their confirmation image
and a red Digitized Sky Survey from 1996 has been posted at website URL
http://bit.ly/KCYwpB); 22.67, 10.4 (Takao); 23.98, 10.3 (Luca Buzzi and
Federica Luppi, Varese, Italy, 0.38-m f/6.8 reflector; position end figures
57s.01, 07".1; UCAC-3 reference stars; their image is posted at website URL
http://www.astrogeo.va.it/pub/TOCP/PNV_J17395600-2447420.jpg).

     Carl Hergenrother, Lunar and Planetary Laboratory, reports photometry
of PNV J17395600-2447420 obtained remotely with a Sierra Stars 0.61-m
telescope.  The V and B magnitudes are derived from the AAVSO VPHOT program,
while the R-band magnitudes were measured using stars from the CMC-14
catalogue:  May 21.4062 UT, V = 11.18 +/- 0.01; 21.4068, R = 10.02 +/- 0.10;
21.4071, B = 12.61 +/- 0.18; 24.3981, V = 12.21 +/- 0.03; 24.3990, B = 13.55
+/- 0.32; 24.3999, R = 10.81 +/- 0.10.  An average of astrometry measured in
the V- and R-band images taken on May 21 and 24 gives the following position
relative to the CMC-14 astrometric catalogue:  R.A. = 17h39m57s.00, Decl. =
-24d47'07".2 (equinox 2000.0).

     Terry Bohlsen reports that he obtained spectroscopy (resolution 600) of
PNV J17395600-2447420 on May 21 showing that the object is very reddened and
demonstrates a broad H_alpha line with a FWHM of 2570 km/s.  Some Fe II lines
are present, and a strong [O I] 777.3-nm line is present.  The spectra were
obtained with a LISA spectrograph using a 24-micron slit on a 20-cm telescope
at Armidale, NSW, Australia.  The spectra are posted at the following website
URL:  http://users.northnet.com.au/~bohlsen/Nova/novaoph.htm.

     Wolfgang Vollmann (Vienna, Austria) reports that a low-resolution
spectrogram (100 lines per mm) taken on May 22.16 UT by Hermann Koberger at
Vilaflor, Tenerife, using a 0.6-m reflector clearly shows strong H_alpha
emission for this object.

     Kazuyoshi Imamura, Okayama University of Science (OUS) team, writes that
he obtained a low-dispersion spectrum (R about 400) of PNV J17395600-2447420
on May 22.697 UT using a 0.28-m Schmidt-Cassegrain telescope (+ DSS-7
spectrometer) at the OUS observatory.  Broad and prominent emission lines of
the Balmer series, Fe II (multiplets 42, 48, 49, 74), O I (747.7- and
777.3-nm), and Mg II (823.2-nm ) can be seen in the spectrum.  The FWHM of
H-alpha is approximately 2900 km/s.  This suggests that the object is a
classical nova.  The spectrogram has been posted at the following website URL:
http://blog-imgs-44.fc2.com/t/n/b/tnblab/pnOPH_20120522.png.

     F. M. Walter, Stony Brook University, reports that PNV J17395600-2447420
is an "Fe II"-type nova.  A red spectrogram (range 570-690 nm; 0.31-nm
resolution) obtained on May 23.41 UT with the SMARTS 1.5-m RC spectrograph
at Cerro Tololo shows H-alpha in emission with an equivalent width of -60.0
nm and a FWZI of +/- 3300 km/s.  No wind absorption is evident.  The Fe II
multiplet 74 lines are in emission.  The nova is very red.  The interstellar
Na D lines have an equivalent width of 0.29 nm.  BVRI/JHK photometry with the
SMARTS 1.3-m Andicam imager on May 23.312 yields V = 11.7, B-V = +1.3, and K
= 6.4.  The field is highly extincted; the brighter stars within about 2' of
the nova typcally have colors B-V around +2 to +3, and J-K around +1.

     Christian Buil, Castanet, France, reports that he obtained spectroscopy
of PNV J17395600-2447420 on May 24.951 UT with a LISA spectrograph on a
0.28-telescope (resolution 0.8 nm, range 390-715 nm), showing an H_alpha line
with intense emission (FWHM of 3060 km/s).  His spectrogram is posted at
website URL http://www.astrosurf.com/buil/nova_oph2012_2/obs.htm.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2012 CBAT
2012 May 26                      (CBET 3124)              Daniel W. E. Green