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IAUC 8940: C/2008 J1; V5579 Sgr = N Sgr 2008

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                                                  Circular No. 8940
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     A. Boattini reports his discovery of a comet with a coma
diameter of about 50" and a fan-shaped tail 2' long in p.a. 235 deg
on Catalina Sky Survey CCD images obtained with the 0.68-m Schmidt
telescope (discovery observation tabulated below).  Following
posting on the Minor Planet Center's 'NEOCP' webpage, several other
CCD astrometrists have found this object to show cometary
appearance.  S. Nakano, Sumoto, Japan, reports that images obtained
on May 2.73-2.74 UT by A. Asami and T. Sakamoto (Bisei Spaceguard
Center 1.0-m f/3 reflector) show a coma diameter of 20" and a tail
24" long in p.a. 230 deg.  R. Apitzsch (Wildberg, Germany, 0.35-m
f/4.2 reflector, May 3.02-3.03) finds a 1' tail toward the
southwest.  V. Gonano, E. Guido, and G. Sostero (Remanzacco, Italy,
0.45-m f/4.4 reflector) report that thirty stacked 60-s unfiltered
exposures obtained during May 3.02-3.05 show a compact coma about
15" in diameter (total mag about 14.7) with a central condensation
and an apparent tail 35" long in p.a. 280 deg.  R. Ligustri
(Talmassons, Udine, Italy, 0.35-m f/5 reflector, May 3.08-3.09)
writes that thirty 60-s exposures show a faint tail 45" long.  J. M.
Aymami (Tiana, Spain, 0.25-m f/5 reflector, May 3.11-3.12) finds a
nuclear condensation and a short, fan-like tail approximately 16"
long in p.a. 238 deg.

     2008 UT             R.A. (2000) Decl.       Mag.
     May   2.46097   21 01 39.57   +10 19 29.9   14.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2008-J17.

     T = 2008 Mar. 17.336 TT          Peri. =   0.915
                                      Node  = 257.241   2000.0
     q = 1.54922 AU                   Incl. =  46.374

     N. N. Samus, Institute of Astronomy, Moscow, informs us that
the nova announced on IAUC 8937 is being assigned the variable-star
designation V5579 Sgr.  Additional photometry from M. M. M.
Santangelo, Capannori, Italy (cf. CBET 1352):  Apr. 27.124 UT, V =
7.56 +/- 0.04, B-V = +1.33 +/- 0.05.  Visual magnitude estimates:
Apr. 24.083, 6.7 (K. Hornoch, Vohancice, Czech Republic); 25.35,
6.9 (W. Souza, Sao Paulo, Brazil; moonlight); 26.29, 7.8 (R.
Fidrich, Bakonycsernye, Hungary); 27.361, 7.7 (Souza); 28.361, 8.0

                      (C) Copyright 2008 CBAT
2008 May 3                     (8940)            Daniel W. E. Green

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