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IAUC 7774: C/2001 X1; 2001ie

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                                                  Circular No. 7774
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 X1 (LINEAR)
     R. Huber, Lincoln Laboratory, Massachusetts Institute of
Technology, reports the discovery by LINEAR of a comet on images
taken on Dec. 13 (discovery observation given below) that show a
bright core surrounded by a diffuse coma (comet's magnitude given
as 16.5-17.0) and exhibiting a tail at least 95" long in p.a. 295
deg.  CCD observations on Dec. 14.1 UT by R. Stoss and P. Geffert
(Starkenburg Sternwarte, 0.45-m f/4.4 reflector) reveal a well-
condensed coma with a thin tail 5' long in p.a. 300 deg (m_2 =
16.5).  CCD images taken in twilight and poor seeing by A. C.
Gilmore (Mount John, 1.0-m f/7.7 reflector) on Dec. 14.6 show the
object as diffuse (m_1 = 14.6-15.1) with a broad, faint fan tail 1'
long in p.a. about 315 deg.

     2001 UT             R.A. (2000) Decl.
     Dec. 13.44178   12 15 50.63   - 7 57 00.9

     Further astrometric observations and the following preliminary
parabolic orbital elements appear on MPEC 2001-X55:

     T = 2001 Dec. 30.277 TT          Peri. = 196.345
                                      Node  = 336.252   2000.0
     q = 1.73851 AU                   Incl. = 113.293

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec.  7    12 21.06   - 4 28.2   1.873   1.765   68.3   31.3   14.8
     12    12 17.19   - 7 08.0   1.763   1.755   73.3   32.5   14.7
     17    12 11.97   -10 03.9   1.654   1.747   78.4   33.5   14.5
     22    12 05.04   -13 18.8   1.548   1.742   83.8   34.2   14.4
     27    11 55.92   -16 55.0   1.446   1.739   89.3   34.4   14.2


SUPERNOVA 2001ie IN UGC 5542
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2001ie (cf. IAUC 7771), obtained by W. Brown on
Dec. 12.48 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST spectrograph), shows it to be a type-Ia supernova near maximum
light.  Adopting the NASA/IPAC Extragalactic Database recession
velocity of 9215 km/s for the host galaxy, the supernova expansion
velocity is about 11 500 km/s for Si II (rest 635.5 nm).  The
spectral-feature age of the supernova (Riess et al. 1997, A.J. 114,
722) was then 3 +/- 2 days after maximum light.

                      (C) Copyright 2001 CBAT
2001 December 14               (7774)            Daniel W. E. Green

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