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IAUC 8396: 2004ea, 2004eb,, 2004ec; RS Oph; V1647 Ori

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IAUC number

                                                  Circular No. 8396
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)

SUPERNOVAE 2004ea, 2004eb, AND 2004ec
     Three apparent supernovae have been reported from their
appearance on unfiltered CCD images:  SNe 2004ea and 2004eb by S.
Park and W. Li (LOSS; cf. IAUC 8395), and SN 2004ec by T. Boles
(cf. IAUC 8392).

SN       2004 UT        R.A.  (2000.0)  Decl.    Mag.     Offset
2004ea   Aug. 29.51    4 16 13.20  -16 45 20.5   18.2   9".2 E, 20".3 S
2004eb   Aug. 29.15   17 28 24.30  +57 32 45.7   17.1   3".4 E, 0".9 N
2004ec   Aug. 29.949  17 08 04.96  +26 22 44.4   17.5   2".2 W, 0".8 N

Additional magnitudes from the respective discoverers:  SN 2004ea
in MCG -03-11-19, Feb. 13.26 UT, [20.0; Aug. 30.45, 18.3.  SN
2004eb in the eastern component of the interacting galaxy pair NGC
6387, Aug. 25.17, [19.0; 30.18, 17.0.  SN 2004ec in UGC 10717, May
27, [19.5; June 27, [19.5; Aug. 30.855, 17.3.  Boles adds that
nothing is visible at the location of SN 2004ec on Digitized Sky
Survey images form 1990 (blue) and 1996 (red).

     B. E. Schaefer, Louisiana State University, writes on the
discovery of a nova eruption of RS Oph in early 1907, as evidenced
by the presence of a post-eruption dip in the light curve on
archival photographic plates at the Harvard College Observatory.
From 1907 May 3 to Sept. 4, the magnitude was at 12.6 < B < 13.0 on
eight plates, while RS Oph was at 11.2 < B < 12.2 before 1906 Oct.
20 (the seasonal gap due to proximity to the sun is from 1906 Oct.
21 to 1907 May 2) and after 1907 Sept. 18 (with three plates from
Sept. 18-28, just before the start of the seasonal gap).  Such dips
(with durations of 0.4-0.8 year) are seen only after all eruptions
of this recurrent nova, so RS Oph must have had an eruption in
early 1907 when it was hidden by the sun.

     C. Aspin, Gemini Observatory; and B. Reipurth, University of
Hawaii, report that an acquisition-camera image, obtained in
morning twilight on Aug. 29 UT through an R-band filter at the
Gemini 8-m telescope on Mauna Kea, shows that V1647 Ori (cf. IAUC
8284, 8354) -- now emerging from conjunction with the sun --
continues to be in its elevated state, and that McNeil's nebula
remains bright.  The duration of the outburst so far exceeds nine

                      (C) Copyright 2004 CBAT
2004 August 30                 (8396)            Daniel W. E. Green

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