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IAUC 9141: C/2010 FB_87; C/2009 UG_89

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IAUC number 

                                                  Circular No. 9141
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET C/2010 FB_87 (WISE-GARRADD)
     An apparently asteroidal object reported by WISE (discovery
observation tabulated below) was briefly on the Minor Planet
Center's 'NEOCP' webpage in early April and then given the
designation 2010 FB_87 (see MPS 320849).  An independent discovery
reported from the Siding Spring Survey (0.5-m Uppsala Schmidt
telescope) by G. J. Garradd (discovery observation also tabulated
below) as comaless but showing a possible extremely faint 10" tail
in p.a. 290 deg (on a stack of four images) was later placed on the
NEOCP.  Follow-up observations measured by S. Foglia, P. Miller,
and J. Wood from a 30-s CCD exposure by Wood with the 2.0-m
'Faulkes Telescope South' (also at Siding Spring) on Apr. 23.6 UT
shows a soft aspect with a 15" tail in p.a. 140 deg.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     Mar. 28.21984   18 47 50.58   -52 39 26.4          WISE
     Apr. 21.66676   18 41 48.03   -61 49 46.7   17.8   Garradd

     The new astrometry, parabolic orbital elements (T = 2010 Nov.
6.444 TT, q = 2.84781 AU, Peri. = 264.805 deg, Node = 89.920 deg, i
= 107.631 deg, equinox 2000.0), and an ephemeris are given on MPEC
2010-H48.


COMET C/2009 UG_89 (LEMMON)
     An apparentely asteroidal object discovered by the Mt. Lemmon
Survey last October (discovery observation tabulated below), and
designated 2009 UG_89 (cf. MPEC 2009-U123; MPS 300946), has been
found to show a coma on CCD images taken by H. Sato (Ota-ku, Tokyo,
Japan, 25-cm reflector) on 2010 Apr. 21.4 (8" coma, mag 18.5), 23.4
(9" condensed coma), and 25.4 UT (12" diffuse coma). J. Scotti,
Lunar and Planetary Laboratory, writes that CCD images taken by R.
McMillan with the Spacewatch 1.8-m reflector on Apr. 25.5 show a
stellar head with a 0'.11 tail in p.a. 188 deg.

     2009 UT             R.A. (2000) Decl.       Mag.   Observer
     Oct. 22.10245   20 52 35.50   -17 48 46.2   20.2   A. D. Grauer

The following orbital elements by G. V. Williams (from 64
observations, 2009 Oct. 22-2010 Apr. 27; MPEC 2010-H68) suggest an
approach to within 0.50 AU of Jupiter on 2009 Sept. 24 (prior to
then, the heliocentric orbit varied between elliptical and
hyperbolic):  Epoch = 2010 Dec. 30.0 TT, T = 2010 Dec. 16.2659 TT,
 e = 1.008063, q = 3.931359 AU, Peri. = 60.6504 deg, Node =
321.0084 deg, i = 130.1001 deg, equinox 2000.0).  With respect to
the solar-system barycenter, the original orbit is elliptical (1/a
= +0.00016198).

                      (C) Copyright 2010 CBAT
2010 April 27                  (9141)            Daniel W. E. Green

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