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IAUC 7147: C/1999 H2; C/1999 H1

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                                                  Circular No. 7147
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 H2 (SOHO)
     D. A. Biesecker, SM&A Corporation and Goddard Space Flight
Center, reports observations of another probable Kreutz sungrazing
comet in SOHO/LASCO C2 data.  The comet reached a peak apparent
magnitude of about 6.0, and a short tail is evident.  It was not
visible in the C3 coronagraph because of the vignetting caused by
the pylon that holds the solar occulter.

     1999 UT           R.A. (2000) Decl.
     Apr. 19.229      1 53.5       +10 03

Astrometric measurements, made by Biesecker and reduced by B. G.
Marsden, and elements by Marsden are given on MPEC 1999-H07.


COMET C/1999 H1 (LEE)
     Orbital elements from MPEC 1999-H06:

     T = 1999 July 11.421 TT          Peri. =  39.678
                                      Node  = 161.967   2000.0
     q = 0.71496 AU                   Incl. = 149.515

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Apr. 16    13 58.98   -68 23.6   0.967   1.718  121.4   29.9    9.3
     18    13 26.07   -68 06.5   0.924   1.690  122.4   30.1    9.1
     20    12 51.73   -67 17.7   0.884   1.662  123.2   30.4    8.9
     22    12 17.71   -65 52.8   0.847   1.633  123.5   30.9    8.8
     24    11 45.64   -63 49.9   0.814   1.604  123.4   31.6    8.6
     26    11 16.67   -61 09.9   0.786   1.576  122.7   32.5    8.5
     28    10 51.33   -57 56.1   0.762   1.547  121.4   33.7    8.3
     30    10 29.62   -54 13.2   0.744   1.518  119.5   35.3    8.2
May   2    10 11.23   -50 07.3   0.732   1.490  117.0   37.1    8.1
      4     9 55.73   -45 45.0   0.725   1.461  113.9   39.1    7.9
      6     9 42.69   -41 13.2   0.724   1.432  110.4   41.3    7.9
      8     9 31.68   -36 38.3   0.729   1.403  106.6   43.6    7.8
     10     9 22.35   -32 06.2   0.739   1.375  102.6   45.8    7.7
     12     9 14.41   -27 41.9   0.754   1.346   98.4   47.9    7.7

     In addition to the discovery information on IAUC 7144, S. Lee
notes that the discovery telescope was a 0.41-m f/6 Newtonian
reflector (about 75x).  Visual m_1 estimates by D. A. J. Seargent,
The Entrance, N.S.W.:  Apr. 18.45 UT, 9.0 (25x100 binoculars);
19.45, 8.4 (10x50 binoculars).

                      (C) Copyright 1999 CBAT
1999 April 19                  (7147)            Daniel W. E. Green

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