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IAUC 8759: RINGS OF SATURN (R/2006 S 1, R/2006 S 2, R/2006 S 3, R/2006 S 4); 2006iv, 2006iw, 2006ix, 2006iy, 2006iz, 2006ja; C/2006 P1

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IAUC number 

                                                  Circular No. 8759
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)


RINGS OF SATURN (R/2006 S 1, R/2006 S 2, R/2006 S 3, R/2006 S 4)
     C. C. Porco, CICLOPS, Space Science Institute, Boulder; and
the Cassini Imaging Science Team report the sighting of several new
rings around Saturn.  One new diffuse ring, R/2006 S 1, has been
found at an orbital distance of about 151500 km, coincident with
the co-orbital satellites, Saturn X (Janus) and XI (Epimetheus)
with a radial width of about 5000 km.  Another new diffuse ring,
R/2006 S 2, has been found coincident with the tiny moon Saturn
XXXIII (Pallene; IAUC 8389), at an orbital distance of about 212000
km and radial width of about 2500 km.  Two other newly sighted
rings have been seen within the Cassini division.  R/2006 S 3 is
located in the outer gap of the Cassini division at an orbital
distance of 119930 km, with a radial width of about 50 km.  Finally,
a very narrow, discontinuous, and tenuous ringlet, R/2006 S 4, has
been seen in between two broad bands in the Cassini division, at an
orbital distance of 118960 km; its width is about 6 km.  R/2006 S 3
appears to have substantial numbers of small particles as it
brightens considerably at high-phase-viewing geometries.


SUPERNOVAE 2006iv, 2006iw, 2006ix, 2006iy, 2006iz, 2006ja
     An apparent supernova (2006iv) has been discovered on
unfiltered CCD images by Grzegorz Duszanowicz (Akersberga, Sweden,
0.32-m f/3.1 reflector); he measured the position of the new object
to be R.A. = 11h48m12s.35, Decl. = +54o59'14".6 (equinox 2000.0),
which is 7" east and 18" south of the center of UGC 6774.
Approximate magnitudes for 2006iv from Duszanowicz's unfiltered
images:  Jan. 3.145 UT, [18.5; Sept. 13.989, [18.0; 22.92, 16.7;
Oct. 5.875, 15.9 (discovery); 7.87, 15.9.
     Five additional faint supernovae (2006iw-2006ja; all in the
magnitude range g = 20.4-22.6) have been reported by J. Frieman on
behalf of the SDSS II collaboration (details on CBETs 663 and 667);
2006iw and 2006ix are type-II supernovae, 2006iy and 2006iz are
type-Ia supernovae, and 2006ja is a probable type-Ia supernova.


COMET C/2006 P1 (McNAUGHT)
     Improved orbital elements (cf. IAUC 8737) from MPC 57794:

     T = 2007 Jan. 12.8217 TT         Peri. = 155.9746
                                      Node  = 267.4139  2000.0
     q = 0.170773 AU                  Incl. =  77.8512

                      (C) Copyright 2006 CBAT
2006 October 11                (8759)            Daniel W. E. Green

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