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IAUC 6984: X/1998 L1, X/1998 M7; C/1998 K5

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                                                  Circular No. 6984
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)


COMETS X/1998 L1 AND X/1998 M7
     D. Biesecker, Space Applications Corporation, NASA Goddard Space
Flight Center, reports provisional data (reduced by G. V. Williams) on two
more comets found in SOHO-LASCO C3 coronagraphic data.  They appear to be
Kreutz sungrazers and were also observed by C2.  Comet X/1998 L1, mag about
5.5 at its peak, was discovered by S. Stezelberger in the real-time data; the
C2 data showed a narrow, faint tail 0.2 deg long.  Comet X/1998 M7, mag
about 5.8 at its peak, was discovered by Biesecker in an automated search
of archival data; no tail was evident.

     1998 UT           R.A. (2000) Decl.
     June 10.072       5 10.7      +18 05      X/1998 L1
          16.406       5 34.2      +20 30      X/1998 M7


COMET C/1998 K5 (LINEAR)
     Ephemeris extension to IAUC 6962 (elements on MPC 32169):

1998 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Aug.  5     3 13.62    +36 44.8    0.458    1.016   77.1   76.8     12.9
     10     3 24.30    +35 00.7    0.490    1.046   79.9   72.6     13.1
     15     3 33.01    +33 25.4    0.519    1.082   83.2   68.4     13.4
     20     3 39.93    +31 56.6    0.547    1.123   86.8   64.2     13.7
     25     3 45.14    +30 32.3    0.571    1.167   90.7   60.0     14.0
     30     3 48.69    +29 10.8    0.594    1.216   95.0   55.8     14.2
Sept. 4     3 50.65    +27 50.9    0.615    1.267   99.7   51.7     14.5
      9     3 51.06    +26 31.6    0.635    1.320  104.7   47.5     14.7
     14     3 49.97    +25 12.0    0.654    1.376  110.1   43.3     15.0
     19     3 47.46    +23 51.6    0.673    1.433  115.9   39.1     15.2
     24     3 43.63    +22 30.1    0.693    1.491  122.0   34.8     15.4
     29     3 38.66    +21 07.7    0.715    1.550  128.3   30.5     15.7
Oct.  4     3 32.74    +19 44.9    0.740    1.610  134.9   26.1     15.9
      9     3 26.13    +18 22.5    0.768    1.671  141.7   21.8     16.2
     14     3 19.06    +17 01.9    0.800    1.732  148.6   17.5     16.4
     19     3 11.80    +15 44.2    0.838    1.793  155.5   13.3     16.7
     24     3 04.60    +14 30.8    0.881    1.854  162.4    9.4     16.9

     Total visual magnitude estimates: July 25.00 UT, 12.6 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 29.02, 12.9 (M. Reszelski,
Szamotuly, Poland, 0.25-m reflector); Aug. 3.99, 12.9 (Reszelski).

                      (C) Copyright 1998 CBAT
1998 August 5                  (6984)              Brian G. Marsden

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