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IAUC 6244: 1995ag; C/1995 O1

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                                                  Circular No. 6244
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1995ag IN UGC 11861
     J. Mueller reports her discovery on a supernova mag about 17
located 20" west and 25" south of the center of UGC 11861 (R.A. =
21h56m.4, Decl. = +73o15', equinox 2000.0); it was found on a IV-N
plate taken by D. Griffith and Mueller on Sept. 28 UT with the 1.2-
m Oschin Schmidt Telescope in the course of the second Palomar Sky
Survey.  No object is present at the position of SN 1995ag on
original Sky Survey prints or on an F plate taken by C. Brewer and
J. D. Mendenhall on 1992 June 28.  A spectrum obtained on Oct. 16
at the 5-m Hale telescope (+ double spectrograph) by I. N. Reid and
J. Gizis confirms this to be a type-I supernova.

     M. F. A'Hearn, M. Haken, and P. D. Feldman report observations
of this comet with the International Ultraviolet Explorer satellite
in late August and early September:  "The upper limit on water
vaporization is 10E29 sE-1, which is not low enough to provide an
interesting constraint on the radius of the nucleus.  The dust
production corresponds to a value of Af(rho) = 400.00 m, one of the
largest values ever observed (A is the albedo of the grains, f is
the filling factor of the grains, and rho is the radius of the
field of view; cf. A'Hearn et al. 1984, A.J. 89, 579).  Further
details are available on the PDS-SBN Hale-Bopp Bulletin Board at
URL http://pdssbn.astro.umd.edu."
     Regarding his item on IAUC 6240, M. Kidger adds:  "The new jet
was found by R. Torres-Chico.  Further analysis of those images, as
well as more images taken on Oct. 1 and 2 UT, shows that the
apparent rotation was due to the unfortunate juxtaposition of a
star with the jet in rather poor seeing.  There is no detectable
rotation of the jet and this may, possibly, have been a renewed
outbreak of the previous active region.  On Sept. 26, we detected
the p.a. of the end of the 'spiral arm' and not the 'straight jet'
section.  The expansion of the jet (which faded rapidly) and its
evolution look very much like the earlier outburst.  Projected
distances of the linear section of the jet (up to the sharp kink)
from our data:  Sept. 28.86, 2".7 (12 800 km); Oct. 2.86, 4".9
(23 300 km).  This implies an expansion velocity of 30 m/s, with
jet commencement on Sept. 24.2.  Images taken on Oct. 14 and 15
show yet another jet emerging, close to the nucleus."

1995 October 16                (6244)            Daniel W. E. Green

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