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IAUC 7383: SUNGRAZING COMETS; C/1999 S4

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                                                  Circular No. 7383
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)


SUNGRAZING COMETS
    Further to IAUC 7376, D. A. Biesecker reports observations
(measures by D. Hammer and himself, reductions by B. G. Marsden) of
four more tailless, Kreutz sungrazing comets seen in SOHO C3 data,
discovered by K. Schenk, except for C/1999 R4, which was first
noted by T. Lovejoy via the SOHO Web page; astrometry and orbital
elements appear on the MPECs indicated below.

   1999 UT        R.A. (2000) Decl.     MPEC      Comet
   Sept. 5.846    10 36.0    + 5 48   2000-F09    C/1999 R4
        20.638    11 29.6    + 0 13   2000-F10    C/1999 S5
        21.179    11 34.6    + 0 20   2000-F11    C/1999 S6
        24.196    11 42.6    - 1 12   2000-F12    C/1999 S7


COMET C/1999 S4 (LINEAR)
     The ephemeris below was computed from orbital elements on MPC
38308.  As this comet may be making its first pass through the
inner solar system (original 1/a = -0.000004 +/- 0.000007 AU**-1),
it should be noted that the observed peak magnitude in July may
well be a couple of magnitudes fainter than that given below (which
assumes brightening as r**-4).

2000 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
May  16     1 57.50   +29 43.8   2.366   1.500   24.0   15.9   10.6
     21     2 00.04   +30 25.8   2.253   1.430   27.3   18.9   10.3
     26     2 02.66   +31 13.1   2.131   1.361   30.7   22.3   10.0
     31     2 05.37   +32 07.0   1.999   1.293   34.2   26.2    9.6
June  5     2 08.25   +33 09.1   1.858   1.225   37.7   30.5    9.2
     10     2 11.40   +34 21.8   1.708   1.158   41.3   35.3    8.8
     15     2 15.01   +35 48.8   1.550   1.093   44.7   40.8    8.3
     20     2 19.46   +37 35.7   1.383   1.031   48.0   47.1    7.8
     25     2 25.44   +39 52.0   1.209   0.972   50.9   54.3    7.3
     30     2 34.40   +42 53.2   1.028   0.917   53.3   62.7    6.7
July  5     2 49.67   +47 06.6   0.846   0.869   54.7   72.7    6.0
     10     3 20.64   +53 17.0   0.666   0.828   54.2   85.1    5.3
     15     4 41.49   +61 44.0   0.503   0.796   50.3  100.5    4.5
     20     8 16.04   +63 08.1   0.392   0.775   42.6  117.4    3.9
     25    11 01.02   +41 05.5   0.385   0.765   40.6  120.3    3.8

                      (C) Copyright 2000 CBAT
2000 March 17                  (7383)            Daniel W. E. Green

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