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IAUC 8584: 2005di; 2005df; C/2005 N6, N7, N8, N9, N10, O3

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IAUC number 

                                                  Circular No. 8584
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)


SUPERNOVA 2005di IN MCG -04-52-46
     Further to IAUC 8583, H. Pugh and W. Li report the LOSS
discovery of an apparent supernova on unfiltered KAIT images taken
on Aug. 12.36 (at mag 18.6) and 13.36 UT (mag 18.3).  The new
object is located at R.A. = 22h25m32s.84, Decl. = -24o14'20".1
(equinox 2000.0), which is 15".0 west and 9".2 north of the nucleus
of MCG -04-52-46.  A KAIT image taken on Aug. 3.32 showed nothing
at this position (limiting mag about 19.5).
     M. Salvo, B. Schmidt, T. Davis, and S. Sankarankutty,
Australian National University (ANU), report that a spectrogram
(range 340-900 nm) of SN 2005di, obtained on Aug. 16.56 UT with the
ANU 2.3-m telescope (+ Double-Beam Spectrograph), is similar to
that of the type-Ia supernova 1994ae a few days past maximum light.


SUPERNOVA 2005df IN NGC 1559
     Additional visual magnitude estimates by R. Evans (cf. IAUC
8580) suggest that this object is again brightening:  Aug. 9.8 UT,
13.0; 10.8, 12.8; 11.7, 13.0; 12.7, 13.0; 15.8, 12.8; 16.8,
12.5-12.6.


COMETS C/2005 N6, N7, N8, N9, N10, O3 (SOHO)
     Several more Kreutz sungrazing comets have been found on SOHO
images (cf. IAUC 8577).  C/2005 N7-N10 appeared stellar in the C3
images (C/2005 N8 and C/2005 N10 being tiny, very faint, and
tailless).  C/2005 N7 reached mag about 5.5 at 10.0 solar radii on
July 12.612 UT in the C3 images, but was slightly diffuse and faded
rapidly in the C2 images; C/2005 N9 reached mag about 5.5 at 9.8
solar radii on July 14.012 in C3 images, but was slightly diffuse
with an unmeasurable hint of tail in C2 images.  C/2005 O3 showed
a bright teardrop and an intermittent tail in C3 data, reaching mag
about 4.5 at 11.1 solar radii on July 23.138, while in C2 images it
showed a very long, faint tail (mostly 'headless') that reached a
length of 17'.2 at 5.8 solar radii on July 23.462.
     Corrigendum.  The reference to the observations and orbital
elements for C/2005 N6 given on IAUC 8577 should read MPEC 2005-O35.

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 N7   July 11.846   7 08.8   +18 56   C3/2  RM   2005-Q03
 C/2005 N8        12.638   7 13.3   +19 45   C3    BZ   2005-Q03
 C/2005 N9        13.113   7 13.6   +18 26   C3/2  RM   2005-Q03
 C/2005 N10       13.363   7 16.8   +19 16   C3    BZ   2005-Q03
 C/2005 O3        21.971   7 43.2   +16 51   C3/2  RM   2005-Q03

                      (C) Copyright 2005 CBAT
2005 August 17                 (8584)            Daniel W. E. Green

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