Electronic Telegram No. 308
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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V1647 ORIONIS
     A. Kospal, Konkoly Observatory, Budapest, reports that CCD
V, R_C and I_C images of V1647 Ori (IAUC 8284, 8354) -- obtained
between Oct. 5 and Nov. 20 at the Mountain Station of Konkoly
Observatory using the 1-m RCC telescope by S. Csizmadia, M.
Eredics, A. Kospal, M. Kun, and M. Racz -- show that this
variable star has started a very rapid fading:  approximately 1
mag/month in I_C as opposed to 0.1 mag/month previously (Semkov
2004, IBVS 5578).  According to the color changes, the rapid
fading is not caused by increasing extinction.  Supposing that
the observed brightness changes of V1647 Ori are intrinsic, and
the fading rate remains unchanged, the star will return to the
pre-outburst state by mid-December 2005.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 November 27                 (CBET 308)               Daniel W. E. Green