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IAUC 7573: COMET C/2001 B2 (NEAT); C/2001 A4, C/2001 B3

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                                                  Circular No. 7573
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)


COMET C/2001 B2 (NEAT)
     E. F. Helin, S. Pravdo, and K. Lawrence, Jet Propulsion
Laboratory, report that their CCD images of this comet taken on
Jan. 24.6 and 25.6 UT with the 1.2-m NEAT telescope at Haleakala
show a coma diameter of about 29"; there is no convincing evidence
for a tail, though some images suggest a certain asymmetry toward
the northwest.  Additional astrometry is reported on MPEC 2001-B47,
together with the following preliminary parabolic orbital elements
by B. G. Marsden:

     T = 2001 June  6.094 TT          Peri. = 336.966
                                      Node  = 145.566   2000.0
     q = 5.21621 AU                   Incl. = 150.249

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan. 21    12 07.71   -22 18.6   4.916   5.316  108.8   10.1   14.7
     26    12 03.80   -22 00.2   4.825   5.309  114.5    9.7   14.7
     31    11 59.47   -21 37.9   4.737   5.302  120.2    9.2   14.6
Feb.  5    11 54.73   -21 11.4   4.656   5.295  126.0    8.7   14.6
     10    11 49.61   -20 40.5   4.580   5.289  131.8    8.0   14.5
     15    11 44.15   -20 05.0   4.512   5.283  137.5    7.3   14.5
     20    11 38.39   -19 25.0   4.452   5.277  143.1    6.5   14.5
     25    11 32.39   -18 40.3   4.402   5.271  148.5    5.6   14.4
Mar.  2    11 26.22   -17 51.2   4.361   5.266  153.5    4.8   14.4


COMETS C/2001 A4 AND C/2001 B3 (SOHO)
     Further to IAUC 7572, D. Hammer reports his measurements for
two additional Kreutz sungrazing comets, found in C3 coronagraph
data at the SOHO website by M. Boschat (C/2001 A4) and M. Oates
(C/2001 B3).  Though C/2001 B3 was visible in many C3 images, it
faded before it entered the field-of-view of the C2 coronagraph.
The reduced observations and orbital elements by B. G. Marsden
appear on the MPECs cited below.

  Comet         2001 UT          R.A. (2000) Decl.       MPEC
  C/2001 A4     Jan. 14.138      19 59.7   -23 36       2001-B21
  C/2001 B3          24.388      20 49.7   -21 06       2001-B45

                      (C) Copyright 2001 CBAT
2001 January 27                (7573)            Daniel W. E. Green

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