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IAUC 8538: 9P; 2005br, 2005bs, 2005cb

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                                                  Circular No. 8538
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)

    N. Biver, D. Bockelee-Morvan, P. Colom, J. Crovisier, and A.
Lecacheux, Observatoire de Paris; and G. Paubert, Institut de
Radioastronomie Millimetrique (IRAM), report:  "Comet 9P/Tempel was
observed with the IRAM 30-m radio telescope from May 4.8 to 9.0 UT.
The HCN J = 3-2 and J = 1-0 lines were detected with mean
integrated intensities of 111 +/- 8 and 31 +/- 4 mK km/s,
respectively.  Day-to-day variations in the HCN line intensities
are observed and reveal periodic variability in HCN production from
5 to 10 x 10**24 molecules/s.  The periodicity is 1.7 days,
consistent with the estimated nucleus rotational period.  H_2S and
CH_3OH were also marginally detected; CO, CS and H_2CO were
searched for and undetected.  The production-rate ratios, or their
upper limits, of these molecules relative to HCN are 5.5, 21, < 110,
< 1.1, and < 17, respectively.  All lines are blue-shifted,
suggesting preferential sunward outgassing."
     Total-magnitude and coma-diameter estimates made with 25x100
binoculars:  Apr. 28.97 UT, 10.9, 3' (J. J. Gonzalez, Asturias,
Spain); May 5.54, 10.3, -- (D. A. J. Seargent, The Entrance, N.S.W.);
26.90, 10.1, 4' (M. Lehky, Hradec Kralove, Czech Rep.); June 5.97,
10.1, 3'.5 (Gonzalez).

SUPERNOVAE 2005br, 2005bs, 2005cb
     M. Turatto, S. Benetti, and A. Harutyunyan, Istituto Nazionale
di Astrofisica (INAF), Padova; M. Riello, Cambridge Astronomical
Survey Unit, Institute of Astronomy, University of Cambridge; E.
Cappellaro, INAF, Napoli; M. T. Botticella, INAF, Teramo; E. Mason,
European Southern Observatory (ESO), write that that obtained
spectroscopy of three southern supernovae with the ANTU Very Large
Telescope (+ Fors2) at ESO on May 25.2 UT under poor weather
conditions.  Based on the reduced spectra (range 380-920 nm,
resolution 1.0 nm), SN 2005br in IC 5084 (IAUC 8516) appears to be
a type-Ib SN about 40 days past maximum; the spectrum is very
reddened and shows a strong interstellar Na I D absorption with EW
about 0.25 nm.  SN 2005bs (IAUC 8517) is a normal type-Ia supernova
about 30 days past maximum.  SN 2005cb in NGC 6753 (IAUC 8530)
appears to be a type-Ib/c supernova, similar to SN 1997X (Munari et
al. 1998, A.Ap. 333, 159) at about 10 days after maximum.
     T. Davis, G. Anderson, and B. Schmidt, Australian National
University (ANU), report that a spectrogram (range 340-920 nm) of
SN 2005cb (cf. IAUC 8530), obtained on May 19.76 UT with the ANU
2.3-m telescope (+ DBS), reveals it to be a type-Ic supernova
approximately 1 week past maximum light.

                      (C) Copyright 2005 CBAT
2005 June 7                    (8538)            Daniel W. E. Green

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