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IAUC 7305: 1999em; C/1999 V1; 141P

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                                                  Circular No. 7305
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1999em IN NGC 1637
     D. C. Leonard, A. V. Filippenko, and R. T. Chornock,
University of California at Berkeley, write: "Preliminary reduction
of spectropolarimetry (ranges 400-510 and 600-730 nm), obtained on
Nov. 5 UT with the Shane 3-m reflector at Lick Observatory,
indicates very weak continuum polarization (p < 0.3 percent,
uncorrected for interstellar polarization) with no significant
polarization variation across the strong Balmer lines (deltap < 0.1
percent).  When modeled in terms of an oblate, electron-scattering
atmosphere (cf. Hoflich 1991, A.Ap. 246, 481), this suggests a
nearly spherical continuum-scattering region, or else a nearly
pole-on viewing orientation."


COMET C/1999 V1 (CATALINA)
     Additional astrometry appears on MPEC 1999-V29, from whence
the following preliminary orbital elements are taken:

     T = 1999 Sept.15.442 TT          Peri. = 176.561
                                      Node  = 295.056   2000.0
     q = 3.06110 AU                   Incl. =  15.206

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Nov.  8     9 39.60   +11 07.5   3.091   3.106   81.7   18.4   17.4
     13     9 44.04   +10 19.8   3.034   3.115   85.4   18.5   17.3
     18     9 48.07   + 9 32.9   2.977   3.124   89.2   18.4   17.3
     23     9 51.70   + 8 46.9   2.921   3.134   93.2   18.3   17.3
     28     9 54.91   + 8 02.0   2.865   3.145   97.2   18.1   17.3
Dec.  3     9 57.66   + 7 18.4   2.811   3.157  101.4   17.8   17.2
      8     9 59.94   + 6 36.2   2.758   3.169  105.6   17.4   17.2
     13    10 01.74   + 5 55.8   2.707   3.182  110.0   16.9   17.2
     18    10 03.05   + 5 17.3   2.659   3.195  114.5   16.3   17.2
     23    10 03.86   + 4 40.9   2.614   3.210  119.1   15.5   17.2
     28    10 04.16   + 4 06.8   2.571   3.225  123.9   14.7   17.1


COMET 141P/MACHHOLZ 2
     Total visual magnitude estimates for component D:  Oct. 31.74
UT, 13.8 (W. Hasubick, Buchloe, Germany, 0.44-m reflector); Nov.
7.24, 12.3 (N. Biver, Oahu, HI, 0.26-m reflector); 8.22, 12.5
(Biver); 9.09, 11.9: (A. Hale, Cloudcroft, NM, 0.41-m reflector).

                      (C) Copyright 1999 CBAT
1999 November 9                (7305)            Daniel W. E. Green

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