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IAUC 9049: V5582 Sgr

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                                                  Circular No. 9049
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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V5582 SAGITTARII
     G. Sun, Wenzhou, Zhejiang, China; and X. Gao, Urumqi, Xinjiang,
China, report the discovery of a possible nova (mag approximately
11.5) on several 60-s survey images (limiting mag about 13.5) taken
by Gao in the course of their nova survey at Mt. Nanshan on Feb.
23.947-23.963 UT using a Canon EOS 350D camera (+ 135-mm f/2 lens).
Their images taken on Apr. 28 by Sun with a 1-m f/8 reflector at
Weihai yield the following position for the variable:  R.A. =
17h45m05s.40, Decl. = -20o03'21".5 (equinox 2000.0).  Nothing was
visible at this location on images taken by the discoverers on 2008
Aug. 23, Sept. 4, 25, and Oct. 3 (limiting mag presumably also about
13.5); they report that nothing is visible at this position on
Digitized Sky Survey images from 1950 June 19 (limiting red mag
20.0), 1980 Aug. 2 (limiting infrared mag 19.5), and 1991 Aug. 2
(limiting red mag 20.8).  Additional available magnitudes from Sun
and Gao for the variable:  Feb. 27.960, 12.1; 28.968, 12.0; Mar.
2.963, 13.0; 3.964, 12.8; 6.968, 13.1; 22.949, 11.6; 26.950, 12.1;
27.947, 12.5; Apr. 28.837, 13.2.
     Following posting on the Central Bureau's unconfirmed-objects
webpage, other observers have reported their observations of this
variable.  K. Nishiyama (Kurume, Fukuoka, Japan) and F. Kabashima
(Miyaki, Saga, Japan) report (via S. Nakano, K. Kinugasa, and H.
Yamaoka) the following magnitudes from their CCD frames:  Feb.
20.855, 10.9; 25.847, 10.4; 28.859, 11.4; Mar. 14.860, 13.2; May
19.665, 14.0; 22.728, 13.7.  From a CCD image taken with a 40-cm
reflector, Nishiyama and Kabashima measured position end figures
05s.40, 21".7.  G. Sostero, E. Guido, and P. Camilleri write that
they obtained position end figures 05s.42, 22".0 and magnitudes R =
12.2, B = 13.8 from images obtained remotely on Mar. 13.44 with a
25-cm f/3.4 reflector at the GRAS Observatory near Mayhill, NM,
U.S.A.; comparison with an Anglo-Australian Observatory Schmidt red
plate (limiting magnitude about 20), obtained on 1991 Aug. 2, shows
an extremely faint object at position end figures of 05s.38, 23".4
at the threshold of the plate.  Additional details are given on
CBET 1816.
     K. Kinugasa, S. Honda, and O. Hashimoto, Gunma Astronomical
Observatory (GAO); and Y. Takeda, National Astronomical Observatory
of Japan, obtained a low-resolution spectrum (range 400-800 nm,
resolution about 500) of this object using the GAO 1.5-m telescope
(+ GLOWS) on May 26.7 UT, which shows strong emission lines of
Balmer series, [O III], [N II], and He I -- suggesting that the
object is a classical nova well past maximum.  N. Samus adds that
the GCVS team has assigned the designation V5582 Sgr to this nova.

                      (C) Copyright 2009 CBAT
2009 May 29                    (9049)            Daniel W. E. Green

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