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IAUC 8814: (119979) 2002 WC_19; 2007aa, 2007ab, 2007ac, 2007ad, 2007ae

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                                                  Circular No. 8814
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)


(119979) 2002 WC_19
     K. S. Noll, Space Telescope Science Institute (STScI); W. M.
Grundy, Lowell Observatory; S. D. Kern, STScI; H. F. Levison,
Southwest Research Institute; and D. C. Stephens, Brigham Young
University, report the detection of a binary companion to the
transneptunian object (119979) 2002 WC_19 (cf. MPECs 2003-A25,
2003-V38), which is in a 1:2 resonance with Neptune.  The
observations were made during 2006 Nov. 5.960-5.985 UT with the
High Resolution Camera of the Advanced Camera for Surveys on the
Hubble Space Telescope, using the clear filters with one 300-s
exposure at each of four dithered positions on the detector.  The
two components were separated by an angular distance of 0".090 +/-
0".008 and differ in brightness by 2.5 magnitudes.  The fainter
component lies at a position angle of 233 +/- 6 deg from the
primary.  The projected separation of the objects in the sky plane
is 2760 +/- 250 km.


SUPERNOVAE 2007aa, 2007ab, 2007ac, 2007ad, 2007ae
     Five apparent supernovae have been discovered on CCD frames
(unfiltered unless otherwise noted below) and reported to the
Central Bureau:  2007aa by Takao Doi of Seabrook, TX, U.S.A.
(0.40-m f/10 Cassegrain reflector at Weimar, TX); 2007ab by L. A.
G. Monard (cf. IAUC 8813); 2005ac and 2007ad by T. Puckett and P.
Gray (cf. IAUC 8804); and 2007ae by Markku Nissinen and Veli-Pekka
Hentunen (Varkaus, Finland; Meade LX200 telescope + Bessel R
filter).  Discovery observations:

SN      2007 UT       R.A.  (2000.0)  Decl.    Mag.     Offset
2007aa  Feb. 18.308  12 00 27.69  - 1 04 51.6  15.7  60" E, 68" N
2007ab  Feb. 19.104  16 51 29.13  - 3 05 33.6  17.8  47" W, 15" N
2007ac  Feb. 19.44   16 47 02.36  +40 08 47.6  17.5  2".0 W, 8".7 N
2007ad  Feb. 19.47   17 24 24.58  +44 56 15.9  17.4  4".9 E, 10".7 S
2007ae  Feb. 19.892  17 01 51.95  +79 01 54.6  17.5  8" E, 21" S

Additional information is available on these objects on the
following Electronic Telegrams:  2007aa in NGC 4030, CBET 848 and
850 (type-II, discovered about 19 days past explosion); 2007ab in
MCG -01-43-2, CBETs 851 and 853 (type-II, discovered about 2 weeks
past explosion); 2007ac in UGC 10550, CBETs 854 and 859 (type-II,
discovered about a week past explosion); 2007ad in UGC 10845, CBETs
854 and 857 (type-II, discovered within a few days of explosion);
2007ae in UGC 10704, CBETs 856 and 859 (type-Ia, discovered just
before maximum).

                      (C) Copyright 2007 CBAT
2007 February 27               (8814)            Daniel W. E. Green

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