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IAUC 8652: 71P; C/2005 Y2; SNe

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IAUC number


                                                  Circular No. 8652
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)


COMET 71P/CLARK
     This comet has been recovered at total mag about 17.5-18 via
observations at several observatories during Dec. 22-30, with the
astrometry, the following orbital elements by B. G. Marsden (from
78 observations, 2000-2005; mean residual 0".7; nongravitational
parameters A_1 = +1.05 +/- 0.19, A_2 = -0.7600 +/- 0.1056), and an
ephemeris appearing on MPEC 2005-Y59.  The correction to the
prediction by S. Nakano (MPC 48382; 2006 Comet Handbook) is
Delta(T) = -0.42 day.

                    Epoch = 2006 May  25.0 TT
     T = 2006 June  6.79246 TT        Peri. = 208.74552
     e = 0.4997464                    Node  =  59.65809 2000.0
     q = 1.5620858 AU                 Incl. =   9.48790
       a =  3.1225878 AU   n = 0.17862083   P =   5.52 years


COMET C/2005 Y2 (McNAUGHT)
     R. H. McNaught reports his discovery of a diffuse comet on CCD
survey exposures obtained with the 0.5-m Uppsala Schmidt telescope
at Siding Spring (discovery observation tabulated below).  Better
exposures taken on Dec. 31.44-31.46 UT confirm a coma diameter of
about 10".

     2005 UT             R.A. (2000) Decl.       Mag.
     Dec. 30.45574   23 07 04.58   -24 09 24.7   17.8

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2006-A01.

     T = 2006 July 25.690 TT          Peri. = 295.386
                                      Node  =  93.331   2000.0
     q = 3.72356 AU                   Incl. =  19.076


SUPERNOVAE
     Several recently discovered supernovae have been found to be
of type II:  2005kk (details on CBET 312), 2005kx (CBET 311),
2005lx (CBET 342), 2005mb (CBET 345), 2005me (CBET 345), 2005mg
(CBET 342).  Type-Ia supernovae:  2005iq (CBET 278), 2005kc (CBET
286), 2005ls (CBET 324), 2005lt (CBET 319, 321), 2005lu (CBET 321),
2005ms (CBET 345).  Type-Ic supernovae:  2005kf (CBET 301), 2005lr
(CBET 321).

                      (C) Copyright 2005 CBAT
2005 December 31               (8652)            Daniel W. E. Green

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