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IAUC 8577: 2003 EL_61, 2003 UB_313,, 2005 FY_9; C/2005 N6

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IAUC number


                                                  Circular No. 8577
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)


2003 EL_61, 2003 UB_313, AND 2005 FY_9
     Three relatively bright transneptunian objects have been
reported by M. E. Brown, C. A. Trujillo, and D. Rabinowitz using
the Palomar 1.2-m Schmidt telescope (+ Quest camera).  The object
2003 UB_313, currently at heliocentric distance r = 97 AU and red
mag 18.5, has absolute magnitude H = -1.1 (Pluto has H = -1.0);
observations, the following orbital elements (P = 557 yr), and an
ephemeris appear on MPEC 2005-O41.

                    Epoch = 2005 Aug. 18.0 TT
     T = 2257 Jan. 26.1837 TT         Peri. = 151.3115
     e = 0.441613                     Node  =  35.8750  2000.0
     q = 37.808 AU                    Incl. =  44.1770

MPEC 2005-O42 contains observations, orbital elements (T = Sept.
2130, q = 38.7 AU, Peri. = 246 deg, Node = 79 deg, i = 29 deg, e =
0.15, P = 308 yr), and an ephemeris for 2005 FY_9 (which is
currently at red mag 17).
     MPEC 2005-O36 contains astrometric observations for an object,
designated 2003 EL_61, of red mag 17 first reported by P. Santos-
Sanz, J. L. Ortiz, and F. J. Aceituno via three CCD frames taken in
March 2003 with a 0.36-m Schmidt-Cassegrain reflector at the Sierra
Nevada Observatory in Granada, Spain, with additional observations
identified from images obtained at several different sites back to
1955.  MPEC 2005-O36 also contains orbital elements (T = Dec. 2133,
q = 35.2 AU, Peri. = 240 deg, Node = 122 deg, i = 28 deg, e = 0.19,
P = 285 yr) and an ephemeris for 2003 EL_61.  This object was also
found by Brown et al. at Palomar on 2004 May 6 [Rabinowitz et al.
2005, Bull. A.A.S. 37(3), Abstr. 56.12], who also obtained
observations at Keck Observatory during Jan.-June 2005 of a
satellite with orbital period 49.1 days and semimajor axis
approximately 49500 km, which indicate a total system mass
approximately 29 percent that of the mass of the Pluto-Charon
system [Bouchez et al. 2005, Bull. A.A.S. 37(3), Abstr. 56.02;
Brown et al. 2005, Ap.J. Let., submitted].


COMET C/2005 N6 (SOHO)
     Another very faint and diffuse tailless Kreutz sungrazing
comet has been found on SOHO images (cf. IAUC 8576; TC = T. Chen).

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 N6   July  6.354   6 54.1   +21 22   C2    TC   2005-O26

                      (C) Copyright 2005 CBAT
2005 July 29                   (8577)            Daniel W. E. Green

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