Sziasztok!
Most már a CBET is bejelentette hivatalosan, hogy Nova Sgr 2012 a
Korotkij és Szokolovszkij által felfedezett nóva. Reméljük, a GCVS
csapat is kiadja a hivatalos elnevezést.
* * *
Electronic Telegram No. 3089
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
NOVA SAGITTARII 2012 = PNV J17452791-2305213
Stanislav Korotkiy, Ka-Dar Observatory; and Kirill Sokolovsky, Astro
Space Center, Lebedev Physical Institute, and Sternberg Astronomical Institute,
Moscow State University, report the discovery of a possible nova (magnitude
9.6) on three 30-s unfiltered CCD images (limiting magnitude about 14.0)
obtained on Apr. 21.011 UT with a wide-field survey camera (+ 135-mm-f.l. f/2
telephoto lens + ST8300M camera) at Ka-Dar Observatory´s TAU Station near
Nizhny Arkhyz, Russia. The new object is located at R.A. = 17h45m28s.03,
Decl. = -23d05´22".8 (equinox 2000.0; UCAC2 reference stars; uncertainty 1"),
noting that a red USNO-B1.0-catalogued star (magnitudes R1 = 16.21, B2=18.61)
lies just 0".6 away from the variable´s position. Their discovery images are
posted at URL
http://www.astroalert.su/files/pnv_j17452791-2305213.jpg.
The variable was designated PSN J17452791-2305213 when it was posted at the
Central Bureau´s TOCP webpage.
Additional magnitudes for PSN J17452791-2305213 (from unfiltered CCD
images unless noted otherwise): Apr. 17.99, [14.0 (Korotkiy and Sokolovsky);
19.73, [12.0 (N. J. Brown, Two Rocks, W. Australia; TMax 400 film + 135-mm-f.l.
f/2.0 camera lens); 20.84, 10.2 (R. J. Gao, Xingming Observatory, China;
V-band suggested; position end figures 28s.02, 23".3; USNO-A2.0 reference
stars; no instrumentation details given); 21.654, 8.8 (John Seach, Chatsworth
Island, NSW, Australia; digital camera + 50-mm-f.l. f/1.0 lens); 22.353, V =
9.58, B = 10.30, I_c = 7.70 (Seiichiro Kiytota, Tsukuba, Japan; remotely with
25-cm reflector + ST-10XME camera near Mayhill, NM, USA; position end figures
28s.03, 22".9); 22.4, 9.1 (Ernesto Guido, Nick Howes, and Giovanni Sostero;
0.25-m f/3.4 reflector, remotely from Mayhill; position end figures 28s.02,
23".2; reference stars from UCAC-3 catalogue; they also note the USNO-B1.0
star only 0".2 away; they have posted a comparison between their confirmation
image and an archival red 1996 plate from the Digitized Sky Survey at website
URL
http://bit.ly/IIV8oN); 22.415, 9.0 (L. Elenin, Lyubertsy, Russia; and I.
Molotov, Moscow, Russia; remotely with a 0.45-m f/2.8 telescope at the ISON-NM
Observatory near Mayhill, NM, USA; position end figures 28s.02, 23".1; NOMAD
reference stars; limiting mag about 17.8); 22.454, V = 9.06 +/- 0.10 (R. A.
Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + Apogee AP-47p camera;
limiting magnitude 15.3; position end figures 28s.02, 22".9; UCAC3 reference
stars); 22.462, 9.4 (Markku Nissinen, Varkaus, Finland; remotely with a
15- cm f/7.3 refractor + color CCD camera of "itelescope.net" near Mayhill;
position end figures 28s.02, 23".0; corrected GSC 1.1 catalogue stars;
limiting magnitude 17.2; nothing brighter than mag 18 on a red Palomar Sky
Survey F plate at this position); 22.718, 9.6 (Koichi Nishiyama, Kurume,
Japan; and Fujio Kabashima, Miyaki, Japan; limiting magnitude 17.6; Meade
200R 0.40-m f/9.8 reflector + SBIG STL1001E camera; position end figures
28s.05, 23".2); 22.979, 9.7 (Korotkiy and Sokolovsky); 23.217, 10.0 (Hermann
Koberger; 0.6-m reflector at Vilaflor, Tenerife; green magnitude from a
digital SLR camera; a low-resolution spectrum at 100 lines per mm from Apr.
23.243 showed H_alpha emission for the object; communicated by Wolfgang
Vollmann); 23.976, 10.0 (Korotkiy and Sokolovsky); 23.993, 10.0 (Korotkiy and
Sokolovsky; 40-cm telescope; position end figures 28s.03, 22".7, uncertainty
0".3; measured by Korotkiy and V. Gerke); Kiytota´s image is posted at
website URL
http://meineko.sakura.ne.jp/ccd/PNV_J17452791-2305213-120422.jpg.
Christian Buil writes that he obtained a spectrogram (resolution 0.7 nm,
range 380-715 nm) of PNV J17452791-2305213 with a 0.28-telescope at the
Castanet Observatory in France on Apr. 23.032 UT that shows an intense H_alpha
broad emission with FWHM = 5600 km/s. He notes that the object seems very
reddened and looks like a nova. He has posted his image at the following
website URL:
http://www.astrosurf.com/buil/nova_sgr2012/obs.htm.
Kazuyoshi Imamura, Okayama University of Science (OUS) team, reports that
he obtained a low-dispersion (R about 400) spectrogram of PNV J17452791-2305213
on Apr. 23.739 UT using the 0.28-m Schmidt-Cassegrain telescope (+ DSS-7
spectrometer) at the OUS observatory. The spectrum shows emission lines of
H-alpha, O I (777.3-nm), and Mg II (788.0-nm). The H-alpha line shows
multiple peaks; the FWHM of H-alpha is approximately 5000 km/s. The variable
appears to be a classical nova. The spectrum can be seen at website URL
http://blog-imgs-44-origin.fc2.com/t/n/b/tnblab/pnv_Sgr_20120423.png.
2012 April 24 (CBET 3089) Daniel W. E. Green
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