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  • MPEC 1999-R38 : 1998 XB

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    M.P.E.C. 1999-R38                                Issued 1999 Sept. 12, 16:51 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  ISSN 1523-6714
    
                                        1998 XB
    
                               Revision to MPEC 1998-X20
    
    Observations:
         J98X00B  C1999 09 11.12034 08 15 16.23 +21 14 46.6          18.4 R      046
         J98X00B  C1999 09 11.12265 08 15 16.71 +21 14 46.3                      046
         J98X00B  C1999 09 11.12377 08 15 16.93 +21 14 46.0                      046
         J98X00B  C1999 09 11.12493 08 15 17.17 +21 14 45.4                      046
         J98X00B  C1999 09 11.13003 08 15 18.13 +21 14 44.1                      046
         J98X00B  C1999 09 11.13120 08 15 18.37 +21 14 44.5                      046
         J98X00B  C1999 09 12.11297 08 18 19.13 +21 11 36.6                      046
         J98X00B  C1999 09 12.11416 08 18 19.36 +21 11 37.1                      046
         J98X00B  C1999 09 12.11530 08 18 19.52 +21 11 36.8                      046
         J98X00B  C1999 09 12.11782 08 18 19.97 +21 11 35.5          17.8 R      046
         J98X00B  C1999 09 12.12422 08 18 21.17 +21 11 34.6                      046
         J98X00B  C1999 09 12.12537 08 18 21.37 +21 11 34.4                      046
    
    Observer details:
    046 Klet.  Observers J. Ticha, M. Tichy.  Measurer M. Tichy.  0.57-m f/6.2
        reflector + CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc, reference and Delta-T
    990911 046  0.7+  1.0+    990912 046  1.7+  0.5+    MPC 34311   +0.00066 day
    
    Orbital elements:
    1998 XB
    Epoch 1999 Aug. 10.0 TT = JDT 2451400.5                 Marsden
    M 115.63454              (2000.0)            P               Q
    n   1.13954985     Peri.  202.58078     +0.13644802     +0.96406051
    a   0.9077798      Node    75.86558     -0.86921283     +0.22690323
    e   0.3511815      Incl.   13.59662     -0.47523782     -0.13821090
    P   0.86           H   15.5           G   0.15           U   4
    Residuals in seconds of arc
    981125 704  0.0   0.6-    981216 557  0.6-  0.4+    981228 402  0.8+  0.0
    981125 704  1.1-  0.9+    981216 557  0.7-  0.3+    981228 402  0.4+  0.1+
    981125 704  1.0+  0.8-    981216 557  0.6-  0.4+    990102 046  0.5-  1.7+
    981125 704  0.7-  0.4-    981216 557  0.5-  0.3+    990102 046  0.7-  0.9+
    981201 327  0.3+  0.0     981216 360  0.1-  0.5-    990102 046  0.0   0.5+
    981201 327  0.2+  0.0     981216 360  0.1+  0.4-    990102 046  1.1-  0.1+
    981201 327  0.3+  0.2+    981216 360  0.0   0.4-    990106 557  0.5-  1.4-
    981202 327  0.4+  0.4+    981217 557  0.4+  0.8-    990106 557  0.4-  1.4-
    981202 327  0.3+  0.1+    981217 557  0.3-  0.9-    990106 557  0.5-  1.5-
    981202 327  0.2+  0.1+    981217 557  0.0   0.5-    990106 557  0.7-  1.4-
    981202 327  0.0   0.1+    981217 046  0.6+  0.2-    990109 327  1.2+  0.9+
    981202 327  0.1-  0.2+    981217 046  0.6+  0.1-    990109 327  0.3-  0.5+
    981202 327  0.0   0.3+    981217 046  0.7+  0.1-    990109 327  0.1-  0.0
    981203 758  0.2+  0.1+    981217 327  0.4+  0.3+    990117 402  0.2-  0.1+
    981203 758  0.7+  0.8+    981217 327  0.4+  0.2+    990117 402  0.0   0.1+
    981203 758  0.5+  0.8+    981217 327  0.2+  0.2+    990117 402  0.0   0.1+
    981203 758  0.5+  0.9+    981217 327  0.3+  0.2+    990118 327  0.0   0.0
    981203 758  0.7-  0.1-    981217 327  0.3+  0.4+    990118 327  0.1-  0.0
    981204 046  0.2+  0.4+    981217 327  0.1-  0.3+    990118 327  0.0   0.1-
    981204 046  0.2-  0.8+    981217 327  0.1+  0.0     990119 046  0.3-  0.6+
    981204 046  0.7-  0.9+    981217 327  0.1+  0.2-    990119 046  0.3-  0.5+
    981204 046  0.3-  0.5+    981217 327  0.2+  0.2+    990119 046  0.4-  0.4+
    981204 097  0.3-  0.1+    981217 327  0.3+  0.2-    990119 104  0.2-  0.0
    981204 097  0.1-  0.4+    981217 327  0.5-  0.3+    990119 104  0.1+  0.1-
    981204 758  0.1+  0.5+    981217 327  0.3+  0.4+    990119 104  0.1-  0.4-
    981204 758  0.0   0.5+    981218 327  0.5+  0.1-    990121 327  0.5+  0.5-
    981204 758  0.9-  0.6+    981218 327  0.4+  0.0     990121 327  0.4+  0.5-
    981204 758  0.9-  0.9+    981218 327  0.6+  0.0     990121 327  0.4+  0.4-
    981204 758  0.2-  0.5+    981218 402  0.3+  0.4-    990121 327  0.6+  0.5-
    981204 713  0.6-  0.0     981218 402  0.6+  0.3-    990121 587  0.4+  0.7-
    981204 713  0.3-  0.3-    981218 402  0.4+  0.2-    990121 587  0.3+  0.8-
    981204 713  1.0-  0.2-    981221 327  0.1-  0.0     990125 711  0.0   0.7-
    981204 713  0.1-  0.9-    981221 327  0.5+  0.1+    990125 711  0.1+  0.7-
    981204 327  0.2+  0.1+    981221 327 (2.8+  0.9+)   990205 355  1.6+  0.2-
    981204 327  0.3+  0.1-    981224 121  0.1-  0.3-    990205 355  0.9+  0.6-
    981204 327  0.4+  0.4-    981224 121  0.0   0.5-    990205 355  1.0+  0.0
    981204 327  0.6+  0.4-    981224 121  0.0   0.6-    990209 118  0.5+  0.5-
    981204 327  0.4+  0.0     981224 360  0.3-  0.4-    990209 118  0.4+  0.5-
    981204 327  0.1+  0.1-    981224 360  0.1-  0.5-    990215 292  0.1+  1.8+
    981205 097  0.5-  0.2-    981224 360  0.4-  0.4-    990215 292  0.7-  0.6+
    981205 097  0.5-  0.1-    981224 327  0.1+  0.4-    990215 292  0.6-  0.6+
    981205 900  1.6-  0.9-    981224 327  0.1+  0.4-    990216 118  0.1-  0.0
    981205 900  0.5-  1.0-    981224 327  0.1-  0.3-    990216 118  0.1-  0.1+
    981206 104  1.2+  0.3+    981225 327  0.3-  0.1-    990216 118  0.2-  0.1+
    981206 104  0.3-  0.8-    981225 327  0.4+  0.0     990228 151  0.8+  0.4+
    981206 104  0.2-  0.4-    981225 327  0.1+  0.1+    990228 151  0.2-  1.5+
    981206 327  0.7+  0.1+    981225 327  0.3-  0.1-    990228 151 (4.3-  4.0+)
    981206 327  0.0   0.2+    981226 151  0.9-  0.6-    990911 046  1.2-  0.7+
    981206 327  0.7+  0.3+    981226 151  1.1-  0.0     990911 046  0.4-  0.8+
    981208 327  0.4-  0.1-    981226 151  0.2+  0.9+    990911 046  0.2-  0.7+
    981208 327  0.8-  0.6+    981226 151  0.3+  0.2-    990911 046  0.2+  0.3+
    981209 327  0.8+  0.6-    981226 327  0.1+  0.3-    990911 046  0.5+  0.1-
    981209 327  0.3+  0.3-    981226 327  0.1+  0.0     990911 046  0.8+  0.5+
    981209 327  0.9+  0.5+    981226 327  0.1+  0.0     990912 046  0.3+  0.1+
    981211 355  0.7-  0.1-    981226 327  0.1+  0.0     990912 046  0.5+  0.8+
    981211 355  0.5+  0.0     981226 327  0.0   0.1-    990912 046  0.2-  0.7+
    981211 355  1.3-  0.1+    981227 402  0.0   0.1-    990912 046  0.4-  0.1-
    981214 327  0.9-  1.6+    981227 402  0.0   0.2-    990912 046  0.0   0.2+
    981214 327  0.0   0.5+    981227 402  0.1-  0.3-    990912 046  0.2-  0.2+
    981214 327  0.4-  0.6+    981228 402  0.4+  0.1+
    
    Ephemeris:
    1998 XB                  a,e,i = 0.91, 0.35, 14                  q = 0.5890
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    1999 09 09    08 08.75   +21 21.0    1.656    1.202    46.2    37.2    18.5
    1999 09 19    08 39.43   +20 45.1    1.615    1.217    48.8    38.4    18.5
    1999 09 29    09 10.12   +19 52.2    1.565    1.225    51.5    39.8    18.5
    1999 10 09    09 41.02   +18 43.0    1.508    1.226    54.1    41.3    18.5
    1999 10 19    10 12.35   +17 17.9    1.443    1.220    56.5    42.9    18.4
    1999 10 29    10 44.38   +15 36.8    1.374    1.207    58.7    44.7    18.3
    1999 11 08    11 17.45   +13 39.1    1.302    1.188    60.6    46.6    18.2
    1999 11 18    11 51.94   +11 23.8    1.228    1.161    62.1    48.8    18.1
    1999 11 28    12 28.32   +08 49.5    1.157    1.128    62.9    51.2    18.0
    1999 12 08    13 07.12   +05 54.3    1.090    1.087    63.0    53.8    17.8
    1999 12 18    13 48.86   +02 37.6    1.031    1.040    62.1    56.7    17.7
    1999 12 28    14 34.11   -00 59.8    0.983    0.987    60.2    59.9    17.6
    2000 01 07    15 23.34   -04 52.6    0.951    0.927    57.3    63.1    17.5
    2000 01 17    16 16.73   -08 48.8    0.938    0.863    53.3    66.1    17.4
    2000 01 27    17 14.17   -12 29.3    0.949    0.796    48.6    68.1    17.3
    2000 02 06    18 15.12   -15 28.8    0.985    0.729    43.4    68.3    17.2
    2000 02 16    19 18.53   -17 20.7    1.049    0.667    38.1    66.0    17.1
    2000 02 26    20 22.95   -17 42.9    1.137    0.619    32.9    60.4    16.9
    
    Brian G. Marsden             (C) Copyright 1999 MPC           M.P.E.C. 1999-R38
    

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