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IAUC 8517: 1999gx, 2005bs; 2005bo; C/1997 P4, P5,, S5

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IAUC number

                                                  Circular No. 8517
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)

SUPERNOVAE 1999gx AND 2005bs
     Further to IAUC 7258, C. Balland (Universite Paris-Sud, Orsay)
and M. Mouchet (Observatoire de Paris, Meudon) report their
discovery of another type-Ia supernova in the spectroscopic data
set of that 1999 intermediate-z supernova search.  SN 1999gx (g' =
23.3; z = 0.493) was observed on 1999 Sept. 7.08 UT at R.A. =
0h34m15s.47, Decl. = +0o04'26".2 (equinox 2000.0).
     Further to IAUC 8516, L. A. G. Monard reports his discovery of
an apparent supernova (mag about 17.4 +/- 0.3) on unfiltered CCD
images taken on Apr. 19.066 UT and confirmed on Apr. 20.014 (at mag
about 17.5 +/- 0.3).  SN 2005bs is located at R.A. = 20h10m14s.11,
Decl. = -56o38'43".6 (equinox 2000.0), which is 4" west and 15"
south of the nucleus of the apparent host galaxy (which itself is
in the cluster Abell 3667).  Nothing is visible at this location on
an image from the Digitized Sky Survey (limiting red mag 20.5) or
on an image taken on Mar. 24.090 by Monard (limiting red mag 18.5).

SUPERNOVA 2005bo IN NGC 4708
     N. Morrell, G. Folatelli, C. Contreras, and M. Hamuy, Las
Campanas Observatory, report that an optical spectrum (range
380-920 nm) of SN 2005bo (cf. IAUC 8514), obtained in the course of
the Carnegie Supernova Project on Apr. 18.23 UT with the Las
Campanas 2.5-m du Pont telescope (+ WFCCD spectrograph), reveals it
to be a normal type-Ia supernova at about maximum light.  The
expansion velocity derived from the minimum of the Si II 635.5-nm
line is 10700 km/s, assuming the recession velocity for NGC 4708
given by Strauss et al. (1992, Ap.J. Suppl. 83, 42).

COMETS C/1997 P4, P5, AND S5 (SOHO)
     Following are the initial available positions for additional
Kreutz sungrazing comets found on SOHO website images (continuation
to IAUC 8516).  K. Battams reports that these three bodies are all
"typical C3 Kreutz" objects in appearance -- small and stellar.

 Comet       1997 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/1997 P4   Aug.  8.266    8 58.0  +14 57   C3    RK   2005-G39
 C/1997 P5         8.728    8 59.5  +14 30   C3    RK   2005-G39
 C/1997 S5   Sep. 19.636   11 31.7  + 0 36   C3    RK   2005-G39

                      (C) Copyright 2005 CBAT
2005 April 20                  (8517)            Daniel W. E. Green

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