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IAUC 7386: C/1999 J6, C/1999 U5, C/1999 W1, C/1999 Y3; C/2000 B5, C/2000 B6, C/2000 B7, C/2000 D3

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                                                  Circular No. 7386
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)


COMETS C/1999 J6, C/1999 U5, C/1999 W1, C/1999 Y3
    Further to IAUC 7376 and 7383, D. A. Biesecker reports
observations (measures by D. Hammer and himself, reductions by
B. G. Marsden) of four more comets seen in 1999 SOHO data, all but
C/1999 J6 being presumed Kreutz sungrazers.  Comets C/1999 J6
(visible in both C2 and C3 data) and C/1999 U5 (visible in only
the C3 telescope) show no tail.  However, C/1999 W1 and C/1999 Y3,
which were both visible with only the C2 telescope, did show tails.
Selected V magnitudes from Biesecker for C/1999 J6:  May 10.750 UT,
8.1; 10.833, 7.3; 10.935, 6.5; 11.088, 5.9; 11.269, 5.5, 11.338,
4.9; 11.462, 5.1.  Comet C/1999 J6 was first noted by M. Oates via
the SOHO Web page; C/1999 U5 and C/1999 W1 were discovered by
Biesecker, and C/1999 Y3 was discovered by A. Vourlidas of the SOHO
team.  Full astrometry and orbital elements appear on the MPECs
indicated below.

   1999 UT        R.A. (2000) Decl.     MPEC      Comet
   May  10.726     3 05.0    +15 48   2000-F30    C/1999 J6
   Oct. 31.495    14 06.8    -17 27   2000-F31    C/1999 U5
   Nov. 23.188    15 55.1    -22 06   2000-F32    C/1999 W1
   Dec. 21.496    18 04.0    -25 03   2000-F33    C/1999 Y3


COMETS C/2000 B5, C/2000 B6, C/2000 B7, C/2000 D3
     Biesecker also reports observations, measured and reduced as
above, of four additional Kreutz sungrazing comets detected by SOHO
in the past couple of months.  Comet C/2000 B5 was discovered by
Biesecker; the other three comets were found by several people
browsing the SOHO web site, as follows:  C/2000 B6, M. Meyer, T.
Lovejoy, J. Shanklin, and M. Oates; C/2000 B7, Meyer and Lovejoy;
C/2000 D3, Meyer and K. Cernis.  C/2000 D3 was visible with both
the C2 and C3 telescopes and showed a short tail; the other three
comets showed no apparent tail and were visible only in the C3
data.  As before, full astrometry and orbital elements appear on
the MPECs indicated below.

   2000 UT        R.A. (2000) Decl.     MPEC      Comet
   Jan. 17.863    20 17.3    -23 30   2000-F34    C/2000 B5
        29.446    21 05.1    -19 55   2000-F35    C/2000 B6
        31.846    21 12.4    -18 52   2000-F36    C/2000 B7
   Feb. 26.413    22 42.2    - 9 34   2000-F37    C/2000 D3

                      (C) Copyright 2000 CBAT
2000 March 24                  (7386)            Daniel W. E. Green

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