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IAUC 8546: 9P; 2005bo, 2005bt; Var OBJECT IN Boo; C/2000 S6

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IAUC number

                                                  Circular No. 8546
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)

     D. Schleicher, Lowell Observatory; and K. Barnes, Franklin and
Marshall College, report that they obtained narrowband photometry
of comet 9P on June 9 using the Hall 1.1-m telescope at Lowell
Observatory, with the following averaged results:  log Q(OH) =
27.79; equivalent log Q(water; vectorial) = 27.83; log Af(rho) =
2.1 (cf. IAUC 7342).  No trends with aperture size are evident for
the gas species, but the radial fall-off of the dust is
significantly steeper than the canonical 1/(rho).  When combined
with monthly photometry previously obtained by Schleicher beginning
in March, it is clear that water production is consistently about a
factor of 2.4 lower than during the equivalent time interval in
1983, and CN is lower by about 2.0 times.  Dust production, based
on the proxy Af(rho), is also lower, but only by about 1.3 times.
Measurements from 1994 show intermediate values between the 1983
and 2005 results, most likely implying an on-going significant
secular decrease in vaporization due to the exhaustion or covering
over of a major source region on the nucleus.

SUPERNOVAE 2005bo AND 2005bt
     M. A. Perez-Torres, M. Jelinek, J. Gorosabel, A. de Ugarte
Postigo, A. J. Castro-Tirado, A. Sota, and A. Alberdi, Instituto de
Astrofisica de Andalucia (IAA), Consejo Superior de Investigaciones
Cientificas, Granada, report R-band magnitudes (+/- 0.1) for two
supernovae obtained with the IAA 0.6-m and 1.5-m telescopes at
Sierra Nevada Observatory:  SN 2005bo in NGC 4708 (cf. IAUC 8514),
Apr. 29.00 UT, 15.2; May 22.88, 16.0.  SN 2005bt in UGC 8205 (cf.
IAUC 8518), Apr. 29.10, 17.0.

     R-band magnitudes for this object (cf. IAUC 8518) by Perez-
Torres et al.:  Apr. 29.07 UT, 16.5; May 18.94, 18.0.

COMET C/2000 S6 (SOHO)
     Following is the initial available position for another Kreutz
sungrazing comet found on SOHO website images (continuation to IAUC
8530).  K. Battams adds that this object appeared stellar and was
barely above the background noise.

 Comet       2000 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2000 S6   Sept.28.488   12 03.2  - 3 03   C2    HS   2005-K43

                      (C) Copyright 2005 CBAT
2005 June 17                   (8546)            Daniel W. E. Green

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