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IAUC 8600: 2005ea; V1647 Ori, ASSOCIATED NEBULA; 169P

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                                                  Circular No. 8600
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 2005ea IN MCG +10-16-61
     D. Lane and P. Gray, Stillwater Lake, NS, Canada, report their
discovery of an apparent supernova (mag about 17.0) on an
unfiltered CCD image (cf. IAUC 8462) taken on Sept. 6.016 UT, with
a confirming image showing the new object at mag about 16.3 on Sept.
13.015.  SN 2005ea is located at R.A. = 11h06m47s.89, Decl. =
+57o41'07".5 (equinox 2000.0), which is about 14" west of the
nucleus of the galaxy MCG +10-16-61.  Nothing is visible at this
location on their images taken on Apr. 22 (limiting mag about 17.7),
June 6 (limiting mag about 18.5), and Aug. 18 (limiting mag about
17.8), and nothing is present on Digitized Sky Survey images from
1994 (limiting red mag about 21.0) and 1988 (limiting blue mag
about 20.5).  A. Sehgal, Osoyoos, BC, Canada, reports that 2005ea
appeared at mag 17.2 and at position end figures 47s.89, 07".4 on
an unfiltered CCD image taken with a 0.50-m reflector on Sept.

     C. Aspin, Gemini Observatory; and B. Reipurth, University of
Hawaii, report on observations made at the Gemini 8-m telescope on
Mauna Kea.  GMOS optical images obtained on Aug. 30 UT show that
V1647 Ori (cf. IAUC 8354), upon its re-emergence in the morning
twilight, has faded by approximately 1 magnitude in the r'
passband since Jan. 8.  McNeil's nebula itself (cf. IAUC 8284) has
also faded considerably.  The duration of the outburst so far
exceeds 21 months.  Optical spectra still show strong H_alpha
emission with blue-shifted absorption.  Both the depth and extent
of the strong absorption component are less than previously
observed, suggesting that the powerful wind is weakening.

     M. Jaeger, Vienna, reports that his co-added CCD images of
this comet (cf. IAUC 8578, 8591) taken on Sept. 6.11 and 7.11 UT
with a 0.20-m Schmidt telescope, with the comet low in the morning
sky, show a coma of diameter 2'-2'.5 and (on Sept. 7.11) a faint
tail approximately 10' long.  A. Hale, Cloudcroft, NM, reports that
his visual observations on Sept. 12.48 (0.2-m reflector) and 13.47
(0.41-m reflector) show the diffuse comet at total mag 11.5 with a
coma diameter of 1'.5 and some slight condensation.  Hale had
previously observed the comet in early August, when it appeared as
an essentially stellar object of mag approximately 14.5-15.0.

                      (C) Copyright 2005 CBAT
2005 September 13              (8600)            Daniel W. E. Green

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