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IAUC 6693: C/1996 F2; MARS; BL Lac

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                                                  Circular No. 6693
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1996 F2 (SOHO)
     C. St. Cyr, Naval Research Laboratory, reports, for the SOHO-LASCO
Consortium (see IAUC 6685), the discovery by D. Biesecker and B. McCarty
of another Kreutz sungrazer in SOHO-LASCO C3 coronagraph archival data.
Measurements by St. Cyr have been reduced by G. V. Williams and are given
on MPEC 1997-N05 in detail, the approximate discovery position being as
follows:

                    1996 UT           R.A. (2000) Decl.
                    Mar. 23.981       0 44.1      - 0 19

This object was perhaps of m1 = 3-4, and it was also visible with a tail
in a single C2 image on Mar. 25.42 UT at 5.2 radii from the center of the
sun.  The orbit computed by the undersigned, also given in detail on MPEC
1997-N05, indicates perihelion passage on Mar. 25.66.


MARS
     M. Gaskell, Department of Physics and Astronomy, University of
Nebraska, reports that possible dust activity was detected in the
Ascraeus-Ceraunius region near the Martian evening limb on June 26.09 UT.
The detection was made using a 0.20-m reflector at 475x and a red W25
filter.  Similar observations on June 28.1, 29.1, 30.1 and July 1.1
suggested that the dust continued, roughly along the equator, to the
Chryse region.  R. McKim, British Astronomical Association, remarks that
similar dust storms in the Ceraunius region were seen at the identical
season in 1935 and 1978.


BL LACERTAE
     J. C. Noble and M. T. Carini, Western Kentucky University; H. R.
Miller, Georgia State University; and T. J. Balonek, K. Whitman and
S. M. Davis, Foggy Bottom Observatory (FBO), Colgate Observatory, report:
"Observations with the 1.1-m Hall (H) telescope at the Lowell Observatory
and the 0.4-m telescope at FBO show BL Lac to be in a major outburst, with
R magnitudes as follows: May 18, 14.04 +/- 0.01 (FBO); 19, 13.95 +/- 0.06 (H);
27, 14.09 +/- 0.05 (H); 28, 14.17 +/- 0.05 (H); 29, 13.80 +/- 0.08 (H);
June 4, 14.30 +/- 0.01 (FBO); 11, 14.22 +/- 0.02 (FBO); 15, 13.71 +/- 0.02
(FBO); 16, 13.93 +/- 0.02 (FBO); 23, 12.50 to 12.75 (FBO) over a 4-hr
interval.  Further observations are encouraged at all wavelengths."

                      (C) Copyright 1997 CBAT
1997 July 5                    (6693)              Brian G. Marsden

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