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IAUC 7561: C/2001 A1; V445 Pup

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                                                  Circular No. 7561
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 A1 (LINEAR)
     M. Blythe reports the discovery by LINEAR of a new comet
(discovery observation below).  Following posting on the NEO
Confirmation Page, several other CCD observers confirmed the
object's cometary nature:  M. Dawson (Luxembourg) found the object
to be diffuse with a 9" coma on Jan. 13.0 UT; Jan. 14.2 images
taken by L. Kornos and P. Koleny (Modra) and by L. Sarounova
(Ondrejov) showed coma diameters of about 15" (m_1 = 16.3) and
about 20" (m_1 = 16.4), respectively; and images taken on Jan. 14.9
by J. Ticha and M. Tichy (Klet) showed a diffuse coma of diameter
17" and a faint 30" tail in p.a. 200 deg.

     2001 UT             R.A. (2000) Decl.        m2
     Jan.  7.46627   12 01 58.99   +42 02 17.7   17.7

Full astrometric data and the following preliminary parabolic
orbital elements are given on MPEC 2001-A54:

     T = 2000 Sept.25.951 TT          Peri. = 112.926
                                      Node  = 338.773   2000.0
     q = 2.52385 AU                   Incl. =  61.786

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan. 11    11 57.71   +41 56.5   2.132   2.773  121.3   17.6   16.6
     21    11 42.77   +41 35.3   2.074   2.819  130.9   15.3   16.6
     31    11 24.12   +40 57.6   2.039   2.867  140.2   12.7   16.6
Feb. 10    11 03.10   +39 52.7   2.034   2.918  148.0   10.3   16.7
     20    10 41.60   +38 15.4   2.062   2.972  152.0    9.0   16.8
Mar.  2    10 21.59   +36 07.5   2.126   3.027  150.3    9.3   16.9
     12    10 04.60   +33 37.3   2.226   3.086  144.0   10.9   17.1


V445 PUPPIS
     W. Liller, Vina del Mar, Chile, writes:  "Low-resolution CCD
spectra taken on Jan. 6.09, 10.10, and 14.09 UT show a slight
weakening of the Fe II lines recorded by me on Jan. 3.23 (IAUC
7556).   Otherwise, the four spectra are all very similar.  While
the lack of hydrogen emission is unusual, other cataclysmic stars
such as CR Boo, CP Eri, and V803 Cen are similarly hydrogen-
deficient.  However, unlike V445 Pup, these stars, are all hot,
blue objects showing He lines in emission and never Ca I or Na I."

                      (C) Copyright 2001 CBAT
2001 January 14                (7561)            Daniel W. E. Green

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