IAU Minor Planet Center

MPEC 2004-Q22 : 2004 FU162

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M.P.E.C. 2004-Q22                                Issued 2004 Aug. 22, 03:19 UT

     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
   on behalf of Commission 20 of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

                  Supported in part by the Brinson Foundation
             Prepared using the Tamkin Foundation Computer Network

                              MPC@CFA.HARVARD.EDU
          URL http://cfa-www.harvard.edu/iau/mpc.html  ISSN 1523-6714

                                  2004 FU162

Observations:
     K04FG2U* C2004 03 31.27744 13 30 48.30 -05 09 28.8          16.7   EQ022704
     K04FG2U  C2004 03 31.28749 13 30 45.24 -05 14 22.5          16.9   EQ022704
     K04FG2U  C2004 03 31.29790 13 30 41.55 -05 19 43.3          17.5   EQ022704
     K04FG2U  C2004 03 31.30799 13 30 37.61 -05 25 11.8          16.9   EQ022704

Observer details:
704 Lincoln Laboratory ETS, New Mexico.  Observers M. Blythe, F. Shelly,
    M. Bezpalko, R. Huber, L. Manguso, D. Torres, R. Kracke, M. McCleary,
    H. Stange, A. Milner.  Measurers J. Stuart, R. Sayer, J. Evans, J. Kommers.
    1.0-m f/2.15 reflector + CCD.

Orbital elements:
2004 FU162
Epoch 2004 July 14.0 TT = JDT 2453200.5                 Chesley
M  33.72709              (2000.0)            P               Q
n   1.31111456     Peri.  139.80776     +0.87470240     +0.48445394
a   0.8267527      Node   191.24124     -0.46121410     +0.82306453
e   0.3919592      Incl.    4.16120     -0.14892032     +0.29642732
P   0.75           H   28.7           G   0.15           U   9
Residuals in seconds of arc
040331 704  0.1+  0.0     040331 704  0.3+  0.0
040331 704  0.3-  0.0     040331 704  0.1-  0.0

     This object passed some 0.000086 AU (= 13000 km) from the center of
the earth on 2004 Mar. 31.65.  By the time the object was detected and
reported to the Minor Planet Center it had moved into the daylight sky,
making follow-up impossible.  It was obvious that a very close approach had
just occurred.  A search by the discoverers for prediscovery images was
unsuccessful.  Although the observed arc is only 44 minutes, the orbit is
quite determinate and, given the exceptional nature of this close approach,
the object is now receiving a designation.  The above orbit is by
S. R. Chesley (JPL), who also supplied a pre-encounter orbit (epoch
2004 Mar. 31.0 TT): M = 289.81518; Peri. = 289.23728; Node = 11.12350;
Incl. = 2.39999; a = 1.0045025; e = 0.3416471.

Gareth V. Williams           (C) Copyright 2004 MPC           M.P.E.C. 2004-Q22

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