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IAUC 7646: V1333 Aql; SUNGRAZING COMETS

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IAUC number 

                                                  Circular No. 7646
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


V1333 AQUILAE
     C. Bailyn, S. Tourtellotte, and L. Walkowicz, Yale University;
and D. Gonzalez and J. Espinoza, Cerro Tololo Interamerican
Observatory (CTIO), report a new outburst of the optical
counterpart of the recurrent x-ray transient Aquila X-1:  "R
exposures of 900 s made on and before June 13 with the Yale 1-m
telescope (+ ANDICAM) at CTIO showed this object at quiescent
levels.  The R brightness was 0.15 and 0.11 mag brighter than the
mean quiescent level on June 14.404 and 15.382 UT, respectively;
this is still within 2-sigma of the quiescent range.  However, on
June 16.420 the source was 0.36 mag brighter in R than at
quiescence, and it has steadily brightened since then, reaching
1.16 mag brighter than quiescence on June 20.361.  All magnitudes
reported are aperture photometry, and include the near neighbor
located 0".4 from the true optical counterpart.  Previous outbursts
have shown x-ray activity starting about 6 days after the start of
the optical precursor, so we expect x-ray activity in the very near
future."


SUNGRAZING COMETS
     Further to IAUC 7642, D. Hammer reports his measurements for
six additional Kreutz sungrazing comets on LASCO C2 coronagraph
images obtained with the SOHO spacecraft; comets C/2001 L8 and
C/2001 L9 were found by X. Leprette and T. Scarmato, respectively,
on images at the SOHO website, while the remaining comets were
found by M. Oates.  C/1997 K7 appears pointlike with no apparent
tail.  The reduced astrometry and orbital elements by B. G. Marsden
appear on MPEC 2001-M06.

    Comet         1997 UT           R.A. (2000) Decl.
    C/1997 K7     May  31.845       4 32.4   +20 19

    Comet         2001 UT           R.A. (2000) Decl.
    C/2001 L5     June  5.814       4 59.0   +20 53
    C/2001 L6           8.875       5 07.2   +21 09
    C/2001 L7           9.004       5 07.6   +21 08
    C/2001 L8          10.004       5 10.8   +21 10
    C/2001 L9          13.564       5 23.2   +21 34

                      (C) Copyright 2001 CBAT
2001 June 20                   (7646)            Daniel W. E. Green

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