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IAUC 8579: C/2005 O2; 2005cz; V5116 Sgr

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                                                  Circular No. 8579
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)

     E. J. Christensen, Lunar and Planetary Laboratory, reports the
discovery of a comet (discovery observation below) in the course of
the Siding Spring Survey, the new object showing a round coma about
7" in diameter with a slight extension in p.a. about 270 deg, on
images taken with the 0.5-m Uppsala Schmidt telescope.

     2005 UT             R.A. (2000) Decl.       Mag.
     July 31.75168    3 34 52.50   -11 47 14.3   18.2

     The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2005-P21.

     T = 2005 Sept.29.550 TT          Peri. = 268.221
                                      Node  = 280.295   2000.0
     q = 3.34281 AU                   Incl. = 148.773

SUPERNOVA 2005cz IN NGC 4589
     D. C. Leonard, California Institute of Technology, reports
that a CCD spectrum (range 340-900 nm) of SN 2005cz (IAUC 8569),
obtained on July 28 UT with the Keck I 10-m telescope (+ LRISp),
shows it to be a type-Ib supernova, about 1-2 weeks after maximum
light.  Although somewhat contaminated by host-galaxy light, the
spectrum is quite similar to SN 1998dt at 8 days past maximum (see
Matheson et al. 2001, A.J. 121, 1648).

     R. W. Russell, D. K. Lynch, and R. J. Rudy, The Aerospace
Corporation, report 0.8-2.5-micron spectroscopy of V5116 Sgr on
July 15 UT using SpeX at the Infrared Telescope Facility.  The nova
showed emission lines of H I, He I, C I, N I, Ca II, and O I with
FWHM about 2200 km/s.  P-Cyg profiles were observed on the He I
lines at 1.0830 and 2.0581 microns.  There was no evidence of
thermal emission from dust.
     Additional visual magnitude estimates (cf. IAUC 8561):  July
9.892 UT, 9.4 (A. Kammerer, Malsch, Germany); 12.93, 9.3 (J.
Carvajal, Madrid, Spain); 30.91, 10.6 (J. G. de S. Aguiar,
Campinas, Brazil).

                      (C) Copyright 2005 CBAT
2005 August 3                  (8579)            Daniel W. E. Green

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