• Processing (Info)

    • MPEC 2000-D29 : 1998 XM2

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    M.P.E.C. 2000-D29                                Issued 2000 Feb. 27, 17:36 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.

             Prepared using the Tamkin Foundation Computer Network

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

                                   1998 XM2

                           Revision to MPEC 1998-X31

Observations:
     J98X02M 1C2000 02 10.69515 12 50 28.57 -40 43 12.2          21.3 R      413
     J98X02M 1C2000 02 10.69872 12 50 28.56 -40 43 14.1          20.9 R      413
     J98X02M 1C2000 02 10.70230 12 50 28.48 -40 43 16.6          21.0 R      413
     J98X02M 1C2000 02 26.64454 12 44 03.39 -42 46 56.4          20.7 R      413
     J98X02M 1C2000 02 26.64852 12 44 03.21 -42 46 57.6                      413
     J98X02M 1C2000 02 26.65217 12 44 03.05 -42 46 58.9          20.4 R      413

Observer details:
413 Siding Spring.  Observer R. H. McNaught.  1.0-m f/8 reflector + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
000210 413 0.04+ 0.00-    000226 413 0.04+ 0.01-    MPC 33767   -0.20 day

Orbital elements:
1998 XM2
Epoch 2000 Feb. 26.0 TT = JDT 2451600.5                 Williams
M 212.62812              (2000.0)            P               Q
n   0.40640483     Peri.   98.94808     +0.87588628     +0.22973051
a   1.8050815      Node   248.70503     -0.33901965     +0.91875165
e   0.3403373      Incl.   27.09156     +0.34334952     +0.32112193
P   2.43           H   17.2           G   0.15           U   3
Residuals in seconds of arc
981209 704  0.0   0.0     981212 422  0.1-  0.6+    990113 691  0.9+  0.5+
981209 704  1.6-  0.7-    981212 402  1.8+  0.5+    990114 691  0.1-  0.4-
981209 704  0.7-  0.8+    981212 402  0.2-  0.4-    990114 691  0.0   0.2-
981209 704  0.1+  0.1+    981212 402  0.2+  0.3-    990117 691  0.0   0.1+
981209 704  0.3-  0.6-    981212 118  0.2-  0.3+    990117 691  0.1+  0.1+
981209 557  0.7+  0.3-    981212 118  0.3+  0.6+    990117 691  0.3+  0.1+
981209 557  0.1+  0.8-    981216 402  0.4-  0.0     990119 691  0.2-  0.0
981210 046  0.4-  0.4-    981216 402  0.5-  0.5-    990119 691  0.2+  0.3-
981210 046  0.1-  0.2+    981216 402  0.0   0.7-    990119 691  0.2+  0.2+
981210 046  0.3+  0.1-    981217 402  0.2-  0.5+    990122 691  0.3-  0.2-
981210 046  1.0+  0.1-    981217 402  0.2-  0.2-    990122 691  0.9-  0.2+
981211 734  0.8+  1.3+    981217 402  0.0   0.0     990122 691  0.2-  0.1-
981211 734 (2.3+  0.5-)   981223 402  0.4+  0.4+    000210 413  0.2-  0.2-
981211 734  0.4-  0.9+    981223 402  0.4-  0.2+    000210 413  0.0   0.0
981211 704  1.5-  0.2+    981223 402  0.3-  0.9-    000210 413  0.5-  0.4-
981211 734  1.4+  1.2-    990105 402  0.1+  0.6+    000226 413  0.2+  0.1+
981211 704  1.2+  0.1+    990105 402  0.5-  0.1+    000226 413  0.2+  0.2+
981211 704  0.5+  1.2+    990105 402  0.3-  0.9-    000226 413  0.2+  0.2+
981211 704  1.6-  0.6-    990113 691  0.3+  0.3+
981211 422  0.2+  0.0     990113 691  0.5+  0.2+

Ephemeris:
1998 XM2                 a,e,i = 1.81, 0.34, 27                  q = 1.1907
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2000 02 26    12 44.50   -42 43.3    1.705    2.364   120.3    21.2    21.3
2000 03 07    12 35.88   -43 22.4    1.607    2.349   127.8    19.5    21.1
2000 03 17    12 24.07   -43 18.4    1.524    2.333   134.7    17.7    20.9
2000 03 27    12 10.37   -42 23.5    1.459    2.315   140.1    16.0    20.7
2000 04 06    11 56.56   -40 35.7    1.415    2.295   143.0    15.2    20.6
2000 04 16    11 44.59   -38 01.5    1.395    2.273   142.3    15.6    20.6
2000 04 26    11 35.85   -34 56.0    1.397    2.250   138.3    17.3    20.6
2000 05 06    11 31.03   -31 37.0    1.421    2.225   131.9    19.7    20.7
2000 05 16    11 30.23   -28 22.1    1.463    2.199   124.4    22.3    20.8
2000 05 26    11 33.09   -25 23.9    1.521    2.170   116.4    24.7    20.9
2000 06 05    11 39.13   -22 49.7    1.590    2.140   108.5    26.7    21.1
2000 06 15    11 47.89   -20 42.6    1.666    2.109   100.9    28.2    21.2
2000 06 25    11 58.88   -19 02.5    1.746    2.076    93.6    29.3    21.3
2000 07 05    12 11.77   -17 47.2    1.828    2.041    86.8    29.8    21.4
2000 07 15    12 26.27   -16 54.2    1.908    2.004    80.2    30.0    21.4
2000 07 25    12 42.15   -16 19.9    1.986    1.967    74.1    29.8    21.5
2000 08 04    12 59.27   -16 01.3    2.058    1.927    68.2    29.3    21.5
2000 08 14    13 17.53   -15 55.0    2.124    1.887    62.6    28.5    21.5

Gareth V. Williams           (C) Copyright 2000 MPC           M.P.E.C. 2000-D29

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