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IAUC 8561: 9P; V5116 Sgr = N Sgr 2005 No. 2; C/2005 A1

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                                                  Circular No. 8561
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)

     H. U. Keller, S. F. Hviid, and M. Kueppers, Max-Planck-Institut
fuer Sonnensystemforschung; I. Bertini, University of Bern; P.
Gutierrez, Instituto de Astrofisica de Andalucia; L. Jorda,
Laboratoire d'Astrophysique de Marseille; J. Knollenberg, Institut
fuer Planetenerkundung, DLR; D. Koschny, European Space Agency
(ESA); and the OSIRIS team report that the 'Optical, Spectroscopic,
and Infrared Remote Imaging System' (OSIRIS) on ESA's Rosetta
spacecraft observed comet 9P/Tempel continuously around the impact
of the 'Deep Impact' projectile.  OSIRIS took images of the dust
with the clear and orange (640 +/- 43 nm) filters.  A sevenfold
increase in the brightness of the inner coma (central pixel
brightness on a scale of 1500 km/pixel) was measured in the first
30 min after the impact.  The brightness of the comet stayed at its
enhanced level for at least 8 hr.  The expansion velocity of the
impact-created dust cloud was 200-250 m/s for the first 8 hr after
the impact.
     Total visual magnitude estimates:  June 9.00 UT, 10.1 (J. J.
Gonzalez, Leon, Spain, 25x100 binoculars); 23.89, 10.2 (K. Hornoch,
Lelekovice, Czech Republic, 0.13-m reflector); 27.93, 10.3 (A.
Baransky, Pylypovychi, Ukraine, 0.36-m reflector); July 1.97, 10.1
(Gonzalez); 3.23, 9.9 (C. E. Spratt, Victoria, BC, 0.08-m refractor;
twilight); 5.00, 10.5 (J. G. de S. Aguiar, Campinas, Brazil, 25x100
binoculars); 5.94, 9.9 (Gonzalez).

     E. Kazarovets and the GCVS team report that the variable-star
designation V5116 Sgr has been assigned to this nova (cf. IAUC
     Additional visual magnitude estimates:  July 5.592 UT, 8.2 (A.
Pearce, Nedlands, W. Australia); 5.960, 8.6 (P. Schmeer,
Bischmisheim, Germany); 5.993, 8.2 (A. Kammerer, Malsch, Germany);
6.476, 8.3 (Pearce); 6.89, 8.4 (M. Lehky, Hradec Kralove, Czech
Republic); 6.894, 8.6 (K. Hornoch, Lelekovice, Czech Rep.); 6.896,
8.8 (A. Baransky, Pylypovychi, Ukraine).

     Further to IAUC 8559, the June 25 observations of component B
were reported together with the confirming July 4 observations.

                      (C) Copyright 2005 CBAT
2005 July 7                    (8561)            Daniel W. E. Green

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