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IAUC 8526: C/2005 EL_173; 2005 EO_304

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IAUC number 

                                                  Circular No. 8526
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 C/2005 EL_173 (LONEOS)
     An apparently asteroidal object that was discovered by the
LONEOS project, and designated 2005 EL_173 by the Minor Planet
Center (discovery observation below from MPS 129296), has been
found by A. Fitzsimmons (Queen's University, Belfast) to have an
asymmetric coma extending to 3".5 in p.a. 70 deg on combined CCD
R-band frames (total exposure 1650 s) taken on May 10.0 UT with the
3.6-m New Technology Telescope at the European Southern Observatory;
individual sub-arcsecond 110-s frames show a compact coma.

     2005 UT             R.A. (2000) Decl.       Mag.
     Mar.  8.24106   11 14 23.44   + 7 40 49.6   19.3

The following hyperbolic orbital elements by B. G. Marsden,
Smithsonian Astrophysical Observatory, are from 39 observations
spanning 2005 Mar. 3-May 4 (including prediscovery Spacewatch
observations from Mar. 3; mean residual 0".5).  The "original"
barycentric value of 1/a is +0.000113 +/- 0.000056 AU**-1 (1-sigma
mean error), while the "future" value of 1/a is +0.000031 AU**-1.

                    Epoch = 2007 Mar.  1.0 TT
     T = 2007 Mar.  6.1192 TT         Peri. = 261.3354
     e = 1.003109                     Node  = 344.7938  2000.0
     q = 3.897440 AU                  Incl. = 130.7181


2005 EO_304
     S. D. Kern and J. L. Elliot, Massachusetts Institute of
Technology, report that VR-band observations, obtained with the
6.5-m Clay telescope (+ MagIC) on Apr. 15 UT in approximately 0".7
seeing, reveal 2005 EO_304 (cf. MPECs 2005-G51, 2005-J15; MPS
130312) to be a binary system.  These observations are part of an
ongoing program for recovery of new tranneptunian objects
discovered by the 'Deep Ecliptic Survey'.  The fainter member of
the pair lies 2".67 +/- 0".06 from the brighter member at p.a. 105
+/- 1 deg.  The primary member of the pair is 1.2 +/- 0.1
magnitudes brighter than its companion.  Additional photometric
and astrometric observations of 2005 EO_304 are strongly encouraged.

                      (C) Copyright 2005 CBAT
2005 May 10                    (8526)            Daniel W. E. Green

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