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IAUC 7601: P/2001 BB_50; C/2001 C6; 2001W, 2001aa

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IAUC number 

                                                  Circular No. 7601
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 P/2001 BB_50 (LINEAR-NEAT)
     S. Pravdo, K. Lawrence, and E. Helin, Jet Propulsion
Laboratory, reported the discovery of a comet on Mar. 20 CCD images
taken with the NEAT 1.2-m reflector at Haleakala, the object
showing a short eastward tail, a nuclear condensation of size < 3",
and a coma diameter of about 10".  T. B. Spahr, Minor Planet Center,
linked this object first with an object reported as asteroidal by
LINEAR on Mar. 18 (m_2 = 19.5) and then to the LINEAR object 2001
BB_50, observed on Jan. 21 and 26 (MPS 25734).  Following posting
on the NEO Confirmation Page, C. Jacques, Belo Horizonte, Brazil,
also reported a 10" coma and m_1 = 18.6 on CCD images taken on Mar.
21 (0.3-m reflector).  Full astrometry and the orbital elements
given below appear on MPEC 2001-F26:

     2001 UT             R.A. (2000) Decl.        m1    Observer
     Jan. 21.46537   13 36 56.92   -11 30 13.4          LINEAR
     Mar. 20.61113   14 03 14.84   -20 22 25.6   18.4   NEAT

     T = 2001 Jan. 30.3429 TT         Peri. = 189.3139
     e = 0.587682                     Node  = 355.8217  2000.0
     q = 2.347221 AU                  Incl. =  10.6196
       a =  5.692747 AU    n = 0.0725640    P =  13.583 years


COMET C/2001 C6 (SOHO)
     Further to IAUC 7585, D. Biesecker reports his measurements
for a comet in images obtained by the C2 and C3 coronagraphs and
found by M. Boschat on SOHO website images.  The reduced
observations and orbital elements by B. G. Marsden appear on MPEC
2001-D42.

        2001 UT          R.A. (2000.0) Decl.
        Feb. 13.888       22 15.4    -15 34


SUPERNOVAE 2001W AND 2001aa
     R. Chornock, A. V. Filippenko, and M. Modjaz, University of
California at Berkeley, report that inspection of a CCD spectrum
(range 320-1000 nm) reveals that SN 2001W (IAUC 7590) is of type
II.  Well-developed P-Cyg profiles are seen in the hydrogen Balmer
lines, and Fe II absorption is present.  SN 2001aa (IAUC 7593) is
also of type II, with a spectrum (range 550-1000 nm) similar to
that of SN 2001W.

                      (C) Copyright 2001 CBAT
2001 March 21                  (7601)            Daniel W. E. Green

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