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IAUC 8478: 2005ab; 2005ac; 1999 HF_1; C/2004 U1

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                                                  Circular No. 8478
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 2005ab IN NGC 4617
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi
Itagaki (Teppo-cho, Yamagata, Japan) of an apparent supernova (red
mag 16.7) on numerous unfiltered CCD frames taken around Feb. 5.638
UT with a 0.30-m f/7.8 reflector.  The new object is located at
R.A. = 12h41m05s.18, Decl. = +50o22'56".2 (equinox 2000.0), which
is 7" west and 40" south of the center of NGC 4617.  Nothing was
visible at this location on CCD frames taken by Itagaki back to
2001 (limiting mag 19.5) or on the Digitized Sky Survey.  Nakano
adds that K. Kadota (Ageo, Saitama-ken, Japan) has confirmed the
presence of a new star (mag 16.8) at position end figures 05s.19,
55".8 on a CCD frame taken with a 0.25-m reflector on Feb. 5.771.

     Further to IAUC 8476, J. Burket and W. Li report the LOSS
discovery of an apparent supernova on unfiltered KAIT images taken
on Feb. 4.50 (at mag 18.0) and 5.56 UT (mag 18.2).  SN 2005ac is
located at R.A. = 13h39m55s.82, Decl. = +0o52'15".0 (equinox 2000.0),
which is 2".2 west and 0".9 south of the nucleus of a compact
galaxy.  A KAIT image taken on Jan. 22.51 also showed the new
object at mag about 18.5, while an image taken on 2004 June 20.21
showed nothing at this position (limiting mag 19.5).

1999 HF_1
     P. Pravec, P. Kusnirak and L. Sarounova, Ondrejov Observatory,
report that their photometric observations -- obtained during 2002
Mar. 31-May 16 -- confirm that 1999 HF_1 is a binary system as
suggested by Pravec et al. (2002, Icarus 158, 276).  They derive an
orbital period of the system of 14.03 hr, the primary's rotation
period of 2.3192 hr, and a secondary-to-primary mean-diameter
ratio of 0.23 +/- 0.03.  Further observations, e.g. during March-
July 2005 (orbit on MPO 66084) are desirable.

     Total-magnitude estimates (visual unless otherwise noted):
2004 Nov. 22.74 UT, 17.3 (K. Kadota, Ageo, Saitama, Japan, 0.25-m
reflector + CCD); Dec. 2.64, 13.8 (Kadota); 5.98, 13.2 (P. Guzik,
Krosno, Poland, 0.20-m reflector); 13.04, 13.1 (J. J. Gonzalez,
Asturias, Spain, 0.20-m reflector); 2005 Jan. 8.53, 13.4 (S.
Yoshida, Ibaraki, Japan, 0.40-m reflector); 14.94, 13.5 (R. J.
Bouma, Groningen, The Netherlands, 0.31-m reflector).

                      (C) Copyright 2005 CBAT
2005 February 6                (8478)            Daniel W. E. Green

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