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IAUC 8853: COMET P/2007 J7 (LINEAR-MUELLER); C/2005 B5, C/2005 B6

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IAUC number 

                                                  Circular No. 8853
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2007 J7 (LINEAR-MUELLER)
     Comet P/1998 S1 (cf. IAUC 7031) has been recovered
independently by R. H. McNaught on CCD images taken with the 0.5-m
Uppsala Schmidt at Siding Spring on May 13 UT and by J. V. Scotti
on CCD images taken with the Spacewatch 1.8-m f/2.7 reflector at
Kitt Peak on June 26.5.  McNaught described the comet as faint and
almost stellar, but with a 20" tail in p.a. 240 deg.  Scotti noted
the comet to have a 9" coma and a 64" tail in p.a. 241 deg.  The
indicated Delta(T) correction to the prediction on MPC 51824 is
+0.03 day [Delta(T) = +0.013 day to the prediction by S. Nakano in
the 2007 Comet Handbook, p. H9].  The orbital elements by B. G.
Marsden below are from 265 observations, 1998-2007 (mean residual
0".6).

     2007 UT             R.A. (2000) Decl.       Mag.   Observer
     May  13.78886   23 22 36.76   - 9 14 02.9   18.2   McNaught
     June 26.45086    0 08 30.27   - 3 24 01.9   18.1   Scotti
          26.45843    0 08 30.69   - 3 23 57.4   18.0     "
          26.46666    0 08 31.06   - 3 23 53.7   18.0     "

                    Epoch = 1998 Nov.  3.0 TT
     T = 1998 Nov.  2.7434 TT         Peri. =  26.3621
     e = 0.416704                     Node  = 359.1837  2000.0
     q = 2.548366 AU                  Incl. =  10.5598
       a =  4.368908 AU    n = 0.1079306    P =   9.132 years

                    Epoch = 2007 Dec.  6.0 TT
     T = 2007 Dec. 16.1419 TT         Peri. =  26.4358
     e = 0.415879                     Node  = 359.1499  2000.0
     q = 2.552135 AU                  Incl. =  10.5462
       a =  4.369188 AU    n = 0.1079202    P =   9.133 years


COMETS C/2005 B5 AND C/2005 B6 (SOHO)
     Two additional Kreutz sungrazing comets (cf. IAUC 8850) have
been found by B. Zhou on 2005 archival SOHO website images.  Each
was stellar in appearance and faint, reaching mag about 7-7.5.

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 B5   Jan. 22.221   20 33.1  -21 40   C3    BZ   2007-L16
 C/2005 B6        30.571   21 06.8  -18 58   C3    BZ   2007-L16

                      (C) Copyright 2007 CBAT
2007 June 26                   (8853)            Daniel W. E. Green

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