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IAUC 8859: P/2007 O2 = P/1998 U2; R CrB

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IAUC number 

                                                  Circular No. 8859
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 O2 = P/1998 U2 (MUELLER)
     L. Buzzi and F. Luppi, Varese, Italy, report the recovery of
comet P/1998 U2 (cf. IAUC 7035, 7036), being slightly diffuse on
CCD images obtained with a 0.60-m reflector, with confirming CCD
images by P. Birtwhistle (Great Shefford, Berkshire, U.K., 0.40-m
reflector).

     2007 UT             R.A. (2000) Decl.       Mag.   Observer
     July 26.09058    3 48 28.53   +21 41 05.3   19.5   Buzzi
          26.10107    3 48 29.86   +21 41 09.8            "
          27.10651    3 50 39.81   +21 48 37.6          Birtwhistle
          27.11524    3 50 40.92   +21 48 43.8   19.5     "

The indicated correction to the predictions in the 2007 Comet
Handbook and on MPC 51823 is Delta(T) = +0.3 day.  The following
orbital elements by B. G. Marsden are from 153 observations,
1998-2007 (mean residual 0".6):

                    Epoch = 1998 Nov.  3.0 TT
     T = 1998 Oct. 20.75954 TT        Peri. =  49.53569
     e = 0.5215660                    Node  = 336.22405 2000.0
     q = 2.0253092 AU                 Incl. =   2.19329
       a =  4.2332052 AU   n = 0.11316187   P =   8.71 years

                    Epoch = 2007 June 29.0 TT
     T = 2007 July  8.20087 TT        Peri. =  49.73116
     e = 0.5206516                    Node  = 336.11998 2000.0
     q = 2.0319152 AU                 Incl. =   2.18993
       a =  4.2389107 AU   n = 0.11293347   P =   8.73 years


R CORONAE BOREALIS
     E. Broens, Vereniging Voor Sterrenkunde, Belgium, reports that
this variable has begun to fade slowly for the first time since
Feb.-May 2003 (cf. IAUC 8077), when it faded over about 20 days
from a visual mag about 6.1 to minimum at mag about 12.7.  Visual
magnitude estimates (non-Belgian data sent directly to the Central
Bureau):  June 21.94 UT, 6.0 (E. Muyllaert, Oostende, Belgium);
July 7.93, 6.3 (Muyllaert); 13.85, 6.5 (F. Van Loo, Genk, Belgium);
16.878, 7.1 (S. Baroni, Milan, Italy); 17.837 7.2 (S. Foglia,
Novara, Italy); 18.909, 7.0 (K. Hornoch, Vohancice, Czech Republic);
19.896, 7.0 (Baroni); 20.96, 7.1 (E. Broens, Mol, Belgium); 22.881,
7.3 (Hornoch); 24.862, 7.6 (Foglia); 24.920, 7.4 (Hornoch).

                      (C) Copyright 2007 CBAT
2007 July 27                   (8859)            Daniel W. E. Green

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