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IAUC 8522: C/2005 H1; 2005bf, 2005bv

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IAUC number 

                                                  Circular No. 8522
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)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2005 H1 (LINEAR)
     An apparently asteroidal object (discovery observation below)
reported by the LINEAR search program, and posted on the 'NEO
Confirmation Page', was found by J. Young (Table Mountain
Observatory, 0.6-m reflector) to show a round 4" coma with little
central condensation and a slightly fan-shaped tail about 16" long
on his CCD images taken on May 2.31-2.38 UT; his images on May 3.3
showed a similar appearance, though it had faded by half a
magnitude to mag 19.5, and the tail length was only 10".  G. Hug
(Eskridge, KS, 0.7-m reflector) writes that the object appears
slightly diffuse on his CCD images taken on May 3.3.  A.
Fitzsimmons (2.0-m Faulkes Telescope-North at Haleakala) notes that
four 60-s R-band exposures taken on May 2.5 show a faint asymmetric
coma extending 3" in p.a. 250 deg.

     2005 UT             R.A. (2000) Decl.       Mag.
     Apr. 30.32224   17 15 23.08   +48 04 20.5   20.3

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2005-J11.

     T = 2005 Feb. 25.833 TT          Peri. = 110.999
                                      Node  =  68.371   2000.0
     q = 5.10555 AU                   Incl. =  83.436


SUPERNOVAE 2005bf AND 2005bv
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 340-730 nm)
of SN 2005bv (cf. IAUC 8520), obtained on May 2.32 UT by P. Berlind
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows
it to be a type-Ia supernova, with a spectral-feature age (cf.
Riess et al. 1997, A.J. 114, 722) of about 15 (+/- 2) days after
maximum light.  The supernova expansion velocity, derived from the
minimum of Si II (rest 635.5 nm) and adopting the recession
velocity of 10 689 km/s for the host galaxy as measured from
H_alpha emission of an H II region in the host galaxy, is about
10400 km/s.  A spectrogram of SN 2005bf (cf. IAUC 8507), obtained
by Berlind on May 2.15, shows it to be a type-Ib supernova,
confirming reports by Wang and Baade (IAUC 8521).  The spectrum has
developed conspicuous lines of He I (rest 447.1, 587.6, 667.8,
706.5 nm) and is very similar to spectra of SN 1984L (Harkness et
al. 1987, Ap.J. 317, 355), about 2 weeks after maximum.  SN 2005bf
was previously classified (IAUC 8509) as a type-Ic supernova.

                      (C) Copyright 2005 CBAT
2005 May 3                     (8522)            Daniel W. E. Green

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