[IAUC] IAUC 9041: N Sgr 2009; Sat OF SATURN; C/2002 S7 = C/2008 N4 = C/1996 X3 [25139-2009/08-R1]

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                                                  Circular No. 9041
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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NOVA SAGITTARII 2009
     K. Kinugasa, Gunma Astronomical Observatory (GAO), writes that
K. Nishiyama (Kurume, Fukuoka, Japan) and F. Kabashima (Miyaki-cho,
Saga, Japan) reported a brightening of a USNO-B1.0-catalogue star
located at R.A. = 17h44m08s.478, Decl. = -26o05'47".37 (equinox
2000.0) -- from fainter than mag 13.5 on their unfiltered CCD
patrol image (105-mm-f.l. camera lens) taken on Apr. 18.705 UT to
mag 12.5 on Apr. 21.681 (with additional magnitudes as follows:
Apr. 21.711, 11.7; 22.720, 11.7; 23.760, 12.3; 25.683, 12.2; 27.815,
12.4).  Kinugasa, S. Honda, and O. Hashimoto took low-dispersion
(range 400-800 nm, resolution about 500) and high-dispersion (range
480-664 nm, resolution about 40000) spectra of this object on Apr.
27.7 with the GAO 1.5-m telescope (+ GLOWS and GAOES, respectively),
which show a broad (FWHM about 2600 km/s) and double-peaked H_alpha
emission, with several emission lines of Fe II and O I --
indicating that this object is a classical nova in decline phase.
The astrometry (using the USNO-A2.0 reference stars) with images
also taken on Apr. 28.8 (when the nova was at V = 13.7, R = 12.9,
I = 10.6) with the 1.5-m telescope (+ GLOWS), reveals position end
figures 08s.44, 48".7 -- which is about 1".4 from the USNO-B1.0
star, so the nova may be unrelated to it.  H. Yamaoka, Kyushu
University, adds that the ASAS-3 system (Pojmanski 2002, Acta Astr.
52, 397) also detects the object at the following V magnitudes:
Apr. 16.374, [14.0:; 19.304, 12.4; 22.332, 13.4; 25.285, 13.6;
30.293, [14.0:.


SATELLITE OF SATURN
     The IAU Working Group for Planetary System Nomenclature has
approved a new designation and name of a satellite of Saturn (cf.
IAUC 8873):

    Saturn LIII     Aegaeon     = S/2008 S 1      IAUC 9023


COMET C/2002 S7 = C/2008 N4 = C/1996 X3 (SOHO)
     Further to IAUC 8985 and R. Kracht's suggestion that C/2002 S7
= C/2008 N4, Kracht has now confirmed the likely identification
with C/1996 X3 (cf. IAUC 8734).  Since the 1996 comet passed
perihelion 0.12 day later than the gravitational 2002-2008 linkage
indicates, he assumed the nongravitational parameters A_1 = 0.0000,
A_2 = +0.0027.  Further details are given on MPEC 2009-J14, which
includes the following orbital elements:  T = 2008 July 4.38 TT, q
= 0.0482, e = 0.9851, Peri. = 52.39 deg, Node = 49.82 deg, i =
13.47 deg (equinox 2000.0), P = 5.78 yr.

                      (C) Copyright 2009 CBAT
2009 May 5                     (9041)            Daniel W. E. Green