• Processing (Info)

    • MPEC 1999-A17 : 1998 WU31

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    M.P.E.C. 1999-A17                                Issued 1999 Jan. 11, 20:09 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.

             BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
                   URL http://cfa-www.harvard.edu/iau/mpc.html

                                   1998 WU31

Observations:
     J98W31U*  1998 11 18.14057 03 07 05.71 +18 27 14.7          23.0 R      695
     J98W31U   1998 11 18.20979 03 07 05.27 +18 27 13.0                      695
     J98W31U   1998 11 18.39543 03 07 04.13 +18 27 08.1                      695
     J98W31U   1998 12 18.00434 03 04 20.44 +18 14 29.6          23.2 R      950
     J98W31U   1998 12 18.04473 03 04 20.21 +18 14 28.7                      950

Observer details:
695 Kitt Peak.  Observers R. L. Millis, M. W. Buie, R. M. Wagner, J. L. Elliot.
    Measurers M. W. Buie, R. L. Millis, J. L. Elliot.  4-m reflector + CCD.
950 La Palma.  Observers M. J. Holman, T. Grav.  Measurers T. Grav,
    M. J. Holman, M. W. Buie.  2.6-m Nordic Optical Telescope + CCD.

Orbital elements:
1998 WU31
The following assumed perihelic 2:3 Neptune-resonance orbital elements
keep the object more than 12 AU from Neptune over a 14 000-year period
Epoch 1998 Nov. 23.0 TT = JDT 2451140.5                 Marsden
M   0.01998              (2000.0)            P               Q
n   0.00396235     Peri.  172.43205     +0.64720768     -0.75626406
a  39.5519041      Node   237.18224     +0.69329848     +0.63621941
e   0.1752114      Incl.    6.54889     +0.31695335     +0.15260908
P 249              H    8.3           G   0.15
From 5 observations 1998 Nov. 18-Dec. 18.

Ephemeris:
1998 WU31                a,e,i = 39.55, 0.18, 7                  q = 32.622
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
1999 01 02    03 03.37   +18 09.6   32.015   32.622   127.4     1.4    23.6
1999 01 12    03 02.94   +18 07.2   32.162   32.622   117.1     1.5    23.6
1999 01 22    03 02.71   +18 05.6   32.323   32.622   106.9     1.7    23.6
1999 02 01    03 02.69   +18 04.8   32.493   32.622    96.7     1.7    23.6
1999 02 11    03 02.89   +18 04.9   32.666   32.622    86.6     1.7    23.7
1999 02 21    03 03.30   +18 06.0   32.837   32.622    76.6     1.7    23.7
1999 03 03    03 03.91   +18 07.8   33.002   32.622    66.7     1.6    23.7
1999 03 13    03 04.70   +18 10.4   33.155   32.622    56.9     1.5    23.7
1999 03 23    03 05.67   +18 13.8   33.292   32.622    47.2     1.3    23.7
1999 04 02    03 06.78   +18 17.7   33.409   32.622    37.5     1.1    23.6

Brian G. Marsden             (C) Copyright 1999 MPC           M.P.E.C. 1999-A17

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