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    • MPEC 1999-A15 : 1998 WS31

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    M.P.E.C. 1999-A15                                Issued 1999 Jan. 11, 19:30 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 WS31

Observations:
     J98W31S*  1998 11 18.09812 02 17 37.85 +16 33 43.0          22.5 R      695
     J98W31S   1998 11 18.16698 02 17 37.44 +16 33 41.4                      695
     J98W31S   1998 11 18.24713 02 17 36.96 +16 33 39.1                      695
     J98W31S   1998 12 17.84201 02 15 13.98 +16 21 24.9          23.1 R      950
     J98W31S   1998 12 17.87639 02 15 13.85 +16 21 24.2                      950
     J98W31S   1998 12 17.91186 02 15 13.72 +16 21 23.7                      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 WS31
The following assumed perihelic 2:3 Neptune-resonance orbital elements
keep the object more than 13 AU from Neptune over a 14 000-year period
Epoch 1998 Nov. 23.0 TT = JDT 2451140.5                 Marsden
M   0.02009              (2000.0)            P               Q
n   0.00395651     Peri.   22.37248     +0.78493100     -0.61873885
a  39.5908209      Node    15.98024     +0.54919196     +0.67064603
e   0.2041100      Incl.    6.74510     +0.28683012     +0.40914075
P 249              H    8.1           G   0.15
From 6 observations 1998 Nov. 18-Dec. 17.

Ephemeris:
1998 WS31                a,e,i = 39.59, 0.20, 7                  q = 31.510
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
1999 01 02    02 14.56   +16 17.5   31.071   31.510   115.7     1.6    23.3
1999 01 12    02 14.36   +16 16.0   31.233   31.510   105.5     1.7    23.3
1999 01 22    02 14.38   +16 15.6   31.404   31.510    95.3     1.8    23.3
1999 02 01    02 14.62   +16 16.3   31.577   31.510    85.2     1.8    23.3
1999 02 11    02 15.06   +16 18.1   31.748   31.510    75.2     1.7    23.3
1999 02 21    02 15.71   +16 21.0   31.911   31.510    65.3     1.6    23.3
1999 03 03    02 16.55   +16 24.8   32.062   31.510    55.4     1.5    23.3
1999 03 13    02 17.55   +16 29.6   32.196   31.510    45.7     1.3    23.3
1999 03 23    02 18.69   +16 35.1   32.311   31.510    36.1     1.1    23.3

Brian G. Marsden             (C) Copyright 1999 MPC           M.P.E.C. 1999-A15

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