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IAUC 8519: 2005bu; C/2005 G2; C/2004 Q2

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IAUC number

                                                  Circular No. 8519
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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2005bu IN PGC 20840
     Further to IAUC 8512, K. Shimasaki and W. Li report the LOSS
discovery of an apparent supernova on unfiltered KAIT images taken
on Apr. 21.19 (mag 17.4) and 22.16 UT (mag 17.5).  SN 2005bu is
located at R.A. = 7h22m18s.21, Decl. = +22o02'39".2 (equinox
2000.0), which is 7".3 east and 3".8 south of the nucleus of PGC
20840.  A KAIT image taken on Apr. 1.18 showed nothing at this
position (limiting mag 19.5).

COMET C/2005 G2 (SOHO)
     K. Battams reports that the following Marsden-group comet
appeared in C2 images as very small and faint (with no tail, as
always with Marsden-group comets), brightening slightly to mag 8.0
at 10.4 solar radii (Apr. 14.354 UT) via the C3 coronagraph.  The
initial position below continues the pattern from IAUC 8517:

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 G2   Apr. 13.685    1 35.2  + 8 55   C3/2  HS   2005-G94

B. G. Marsden remarks on MPEC 2005-H24 on the possibility that
C/1999 N5 separated into both C/2005 E4 (see IAUC 8594) and C/2005
G2.  Z. Sekanina and P. W. Chodas (Jet Propulsion Laboratory) find
that such a separation with zero relative velocity on T = 1999 July
11.2 would involve a relative deceleration of 8.6 in units of
10**-5 the solar attraction.  The best zero-velocity fit gives
separation 0.93 day before perihelion and deceleration 14.6 units.
For the suggested separation (IAUC 8494) of C/1999 J6 and C/1999 N5
at their previous T in Nov. 1993 (and again with zero velocity)
Sekanina and Chodas find a minimum relative deceleration of 16.6
units.  On MPEC 2005-H24 Marsden points out that, if C/1999 P6 and
C/1999 P8/P9 (see IAUC 7863) were also produced at the Nov. 1993
separation, they should return (if they still exist) within a few
days of 2005 Apr. 28 and May 18, respectively.

     Total visual magnitude estimates:  Mar. 9.98 UT, 5.7 (J.
Carvajal, Madrid, Spain, 6x30 binoculars); 18.14, 6.5 (N. Biver,
Poigny-la-foret, France, 7x50 binoculars); Apr. 1.85, 7.0 (A.
Kammerer, Malsch, Germany, 9x63 binoculars); 10.85, 7.2 (A.
Diepvens, Balen, Belgium, 20x50 binoculars); 17.84, 7.6 (A.
Baransky, Bucha, Ukraine, 10x50 binoculars).

                      (C) Copyright 2005 CBAT
2005 April 22                  (8519)            Daniel W. E. Green

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