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IAUC 7722: 2001em; 19P; C/2000 WM_1; P/2001 Q6

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IAUC number

                                                  Circular No. 7722
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2001em IN UGC 11794
     M. Papenkova and W. D. Li, University of California at
Berkeley, report the discovery by LOTOSS (cf. IAUC 7514) of an
apparent supernova (mag about 18.6) in unfiltered images taken with
the Katzman Automatic Imaging Telescope (KAIT) on Sept. 20.3 and
21.3 UT.  SN 2001em is located at R.A. = 21h42m23s.66, Decl. =
+12o29'50".9 (equinox 2000.0), which is 11".1 east and 3".5 south
of the nucleus of UGC 11794.  An unfiltered image taken with the
0.8-m Tenagra II telescope by J. Wray, C. W. Chleborad, and M.
Schwartz on Sept. 15.3 already showed a hint of the new object.
KAIT images taken on Sept. 5.3 (limiting mag about 19.5) and 10.3
(limiting mag about 18.5) showed nothing at this positon.

     D. Schleicher, Lowell Observatory, writes:  ''I obtained
narrowband photometry of comet 19P on Sept. 18 and 19 using the
Hall 1.1-m telescope at Lowell Observatory, yielding the following
averaged production-rate results:  log Q(OH) = 28.34; equivalent
log Q(water; vectorial) = 28.41; log Af(rho) = 2.50 (cf. IAUC 7342).
The radial fall-off of the dust is significantly steeper than the
canonical 1/(rho), with Af(rho) decreasing by 1.9 times between rho
= 20 000 and 110 000 km."

     Schleicher adds that his narrowband photometry of comet C/2000
WM_1, obtained as above on Sept. 18 and 19 (at r = 2.33), yields
the following averaged results:  log Q(OH) = 27.87; equivalent log
Q(water; vectorial) = 27.87; log Af(rho) = 2.42.  No temporal or
aperture variations were observed.

COMET P/2001 Q6 (NEAT)
     Additional astrometry and the following orbital elements,
published on MPEC 2001-S06, indicate this comet (cf. IAUC 7698) to
be of short period:

     T = 2001 Nov.  9.4373 TT         Peri. =  43.3153
     e = 0.825605                     Node  =  22.1467  2000.0
     q = 1.408422 AU                  Incl. =  56.8755
       a =  8.076029 AU    n = 0.0429445    P =  22.951 years

                      (C) Copyright 2001 CBAT
2001 September 21              (7722)            Daniel W. E. Green

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