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IAUC 7233: C/1999 H1

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                                                  Circular No. 7233
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 H1 (LEE)
     P. Mason, C. Murray, D. Bambic, J. Durbin and A. Wootten, National
Radio Astronomy Observatory, report: "The OH 18-cm transitions were
detected toward comet C/1999 H1 at the 43-m (140-ft) telescope in Green
Bank on May 25.  The 1667-MHz line was measured with a line area of
0.062 +/- 0.007 K km/s in antenna temperature; the 1665-MHz line was
measured at 0.026 +/- 0.008 K km/s.  The 1667/1665 ratio of 2.4
reasonably matches the expected line ratio of 1.8.  Assuming an OH
lifetime of 2 x 10**5 s, the line measurements give a water-production
rate of 5.5 x 10**28 s-1."
     K. Kadota and S. Yoshida, for the Ageo Survey team, report that
their CCD images (0.18-m f/5.5 reflector) on July 29.77 UT show a narrow
tail 7'.8 long in p.a. 321 deg and a broad antitail 17'.5 long in p.a.
109 deg.  The image can be found at
http://www.info.waseda.ac.jp/muraoka/members/seiichi/pictures/comet.html .
     The following improved orbital elements are from MPEC 1999-P18.  The
'original' revolution period was about 2100 years.

                    Epoch = 1999 July  1.0 TT
     T = 1999 July 11.1721 TT         Peri. =  40.7000
     e = 0.999752                     Node  = 162.6490  2000.0
     q = 0.708104 AU                  Incl. = 149.3532

1999 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Aug.  5     7 23.29    +38 23.1    1.585    0.866   29.7   35.5      7.4
     10     7 15.36    +40 15.9    1.524    0.924   36.1   40.3      7.6
     15     7 06.43    +42 14.8    1.453    0.987   42.7   44.1      7.8
     20     6 55.92    +44 23.0    1.375    1.054   49.6   47.0      7.9
     25     6 42.99    +46 43.2    1.291    1.123   56.8   48.9      8.1

     30     6 26.37    +49 17.4    1.204    1.193   64.5   49.8      8.2
     31     6 22.45    +49 49.9    1.187    1.208   66.1   49.9      8.2
Sept. 1     6 18.29    +50 23.0    1.169    1.222   67.8   49.9      8.2
      2     6 13.86    +50 56.5    1.152    1.236   69.4   49.8      8.2
      3     6 09.15    +51 30.5    1.134    1.250   71.1   49.8      8.2
      4     6 04.12    +52 04.8    1.117    1.265   72.8   49.6      8.3
      5     5 58.76    +52 39.5    1.100    1.279   74.6   49.5      8.3
      6     5 53.03    +53 14.3    1.083    1.293   76.3   49.2      8.3
      7     5 46.90    +53 49.1    1.066    1.308   78.1   49.0      8.3
      8     5 40.34    +54 23.9    1.050    1.322   80.0   48.6      8.3
      9     5 33.32    +54 58.3    1.033    1.337   81.8   48.2      8.3

                      (C) Copyright 1999 CBAT
1999 August 7                  (7233)              Brian G. Marsden

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