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IAUC 6961: C/1998 M5

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                                                 Circular No. 6961
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1998 M5 (LINEAR)
     Additional CCD astrometry:

     1998 UT             R.A. (2000) Decl.        m1    Observer
     July  1.29736   23 09 44.63   +18 09 21.4   16.5   Elliott
           1.31044   23 09 44.29   +18 09 37.5   16.4     "
           1.70586   23 09 32.62   +18 17 34.6   12.8   Zoltowski
           1.72289   23 09 32.10   +18 17 54.9   12.8     "
           2.17873   23 09 18.31   +18 26 58.3   13.9   Griffin
           2.18102   23 09 18.27   +18 27 01.7   14.0     "
           2.35421   23 09 12.76   +18 30 29.5   14.7   Koff
           2.40640   23 09 11.16   +18 31 34.1   14.6     "

R. Elliott (Hobbs Observatory, Fall Creek).  0.3-m f/3.3 reflector.
F. B. Zoltowski (Woomera).  0.30-m f/3.3 Schmidt-Cassegrain reflector.
I. P. Griffin (Cocoa).  0.30-m f/5 Maksutov reflector.
R. A. Koff (Thornton).  0.20-m f/7.5 Schmidt-Cassegrain reflector.

     Preliminary parabolic orbital elements by the undersigned
from 28 observations, June 30-July 2:

     T = 1999 Jan. 24.002 TT          Peri. =  89.450
                                      Node  = 333.261   2000.0
     q = 2.11105 AU                   Incl. =  80.342

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 26    23 11.92   +16 25.8   2.893   3.198   98.0   18.3   12.9
July  1    23 09.89   +18 03.5   2.784   3.159  102.1   18.3   12.7
      6    23 07.12   +19 44.6   2.678   3.119  106.2   18.2   12.6
     11    23 03.52   +21 28.9   2.577   3.080  110.3   18.0   12.4
     16    22 59.02   +23 16.1   2.480   3.042  114.2   17.7   12.3
     21    22 53.51   +25 05.4   2.389   3.003  118.0   17.4   12.2
     26    22 46.90   +26 55.8   2.304   2.965  121.6   17.0   12.0
     31    22 39.12   +28 46.0   2.227   2.927  124.8   16.5   11.9
Aug.  5    22 30.12   +30 34.4   2.157   2.890  127.6   16.1   11.8
     10    22 19.87   +32 18.9   2.096   2.853  129.8   15.8   11.7
     15    22 08.40   +33 57.3   2.043   2.817  131.3   15.7   11.5

     A. Hale, Cloudcroft, NM, reports m_1 = 12.8 and coma diameter
about 0'.5 on July 2.38 UT (0.41-m reflector, visual).

                      (C) Copyright 1998 CBAT
1998 July 2                    (6961)            Daniel W. E. Green

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