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IAUC 8688: 2006 E1; RS Oph

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                                                  Circular No. 8688
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET 2006 E1
     R. H. McNaught reports his discovery of a comet with a coma of
diameter about 6", extended to the northwest, on Siding Spring
Survey images taken with the 0.5-m Uppsala Schmidt telescope.

     2006 UT             R.A. (2000) Decl.       Mag.
     Mar. 11.74071   19 31 31.33   -46 07 56.2   18.0
          11.74600   19 31 31.51   -46 07 58.2   18.0
          11.75130   19 31 31.72   -46 08 00.4   18.3
          11.75661   19 31 31.94   -46 08 02.9   18.1
          11.78456   19 31 32.97   -46 08 14.5
          11.78789   19 31 33.09   -46 08 16.1   18.5
          11.79123   19 31 33.16   -46 08 17.1   18.7
          12.74392   19 32 08.04   -46 14 53.0   18.4
          12.75994   19 32 08.68   -46 15 00.2   17.9


RS OPHIUCHI
     T. J. O'Brien, T. W. B. Muxlow, S. T. Garrington, and R. J.
Davis, Jodrell Bank Observatory, University of Manchester; R. W.
Porcas, Max-Planck-Institut fuer Radioastronomie, Bonn; M. F. Bode,
Liverpool John Moores University; S. P. S. Eyres, University of
Central Lancashire; and A. Evans, Keele University, write that 6-cm
radio observations made with the Very Long Baseline Array on Feb.
26 show radio emission from RS Oph in the form of a ring of
diameter approximately 18 mas, consistent with the size of the
single circular component fitted to the MERLIN imaging reported on
IAUC 8684.  The ring appears almost circular, clumpy, significantly
brighter on its eastern side, and with some evidence for a central
point source.  At a distance of 1600 pc, the diameter of the ring
is 29 AU and, assuming that it has expanded uniformly since
outburst, its expansion velocity is about 1800 km/s.  O'Brien et al.
suggest that this ring of radio emission may be identified with a
shock wave expanding through the red-giant wind following the nova
explosion, also resulting in the x-ray emission reported on IAUCs
8675, 8677, and 8683.  VLBA observations are continuing.
     Visual magnitude estimates, reported in part by E. Waagen,
AAVSO:  Feb. 17.249 UT, 6.5 (C. Labordena, Castellon, Spain);
21.847, 7.4 (A. Pearce, Nedlands, W. Australia); 26.180, 7.9 (B.
Granslo, Fjellhamar, Norway); Mar. 2.163, 8.1 (C. Otten, Kinrooi,
Belgium); 5.139, 8.2 (G. Mavrofridis, Nikea, Greece); 13.183, 8.9
(E. Muyllaert, Oostende, Belgium).

                      (C) Copyright 2006 CBAT
2006 March 16                  (8688)            Daniel W. E. Green

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