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IAUC 7730: V445 Pup; 1998 ST_27; C/1996 B5, C/1996 R4, C/2001 S2

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                                                  Circular No. 7730
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     A. A. Henden, Universities Space Research Association and U.S.
Naval Observatory, Flagstaff Station (USNOFS); R. M. Wagner, LBT
Observatory; and S. G. Starrfield, Arizona State University, report
that the following infrared photometry of V445 Pup was obtained in
the pre-dawn sky with the USNOFS 1.55-m telescope(+ ASTROCAM):
Sept. 29.61 UT, L' = 5.74 +/- 0.12 (cf. L = 2.63 +/- 0.05 on Jan.
31.5; IAUC 7580); Oct. 4.54, K' = 9.15 +/- 0.02.  However, V- and
I-band CCD images obtained at large airmass in a brightening sky
with the USNOFS 1.0-m telescope on Oct. 4.51 show no object
brighter than V = 20 and I = 19.5 mag at the location of V445 Pup.
Henden et al. remark:  "The object is evidently shrouded in a thick
and dense carbon dust shell, in view of the apparent over-abundance
of carbon in the ejecta previously observed in infrared and optical
spectra (cf. IAUC 7559 and 7717).  Further observations are
requested to follow the evolution of this unique object."

1998 ST_27
     L. A. M. Benner, Jet Propulsion Laboratory; M. C. Nolan,
Arecibo Observatory; S. J. Ostro and J. D. Giorgini, Jet Propulsion
Laboratory; and J. L. Margot, California Institute of Technology,
write:  "Arecibo (2380-MHz, 13-cm) delay-Doppler radar images
obtained on Oct. 7 and 9 reveal that 1998 ST_27 (MPEC 2001-S28) is
a binary system.  The images show separations up to at least 4 km
between the components, whose sizes differ by a factor of at least
three.  Follow-up optical observations are desirable."

COMETS C/1996 B5, C/1996 R4, C/2001 S2 (SOHO)
     Further to IAUC 7726, D. Hammer reports his measurements for
additional Kreutz sungrazing comets found by X. Leprette (C/1996
B5) and M. Oates on SOHO website C3 coronagraph images (and also C2
images for C/2001 S2).  The reduced observations and orbital
elements by B. G. Marsden are included on MPEC 2001-T15.

    Comet         1996 UT           R.A. (2000) Decl.
    C/1996 B5     Jan. 29.352      21 01.4   -19 25
    C/1996 R4     Sept.14.804      11 19.4   + 2 24

    Comet         2001 UT           R.A. (2000) Decl.
    C/2001 S2     Sept.28.154      11 58.1   - 3 01

                      (C) Copyright 2001 CBAT
2001 October 9                 (7730)            Daniel W. E. Green

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