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  • MPEC 2008-G10 : COMET P/1998 X1 = 2006 B7 (ODAS)

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    M.P.E.C. 2008-G10                                Issued 2008 Apr. 2, 03:33 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
    
                                  MPC@CFA.HARVARD.EDU
              URL http://www.cfa.harvard.edu/iau/mpc.html  ISSN 1523-6714
    
                           COMET P/1998 X1 = 2006 B7 (ODAS)
    
    Observations:
        PK06B070  C2005 10 07.50214 09 54 02.73 +13 40 02.2          20.1 T EG010G96
        PK06B070  C2005 10 07.50446 09 54 03.02 +13 40 01.5                 EG010G96
        PK06B070  C2005 10 07.50678 09 54 03.24 +13 40 00.7                 EG010G96
        PK06B070  C2005 10 07.50910 09 54 03.60 +13 39 58.7                 EG010G96
    
    Observer details:
    G96 Mt. Lemmon Survey.  Observer E. J. Christensen.  Measurers E. C. Beshore,
        A. Boattini, E. J. Christensen, A. R. Gibbs, A. D. Grauer, R. E. Hill,
        R. A. Kowalski, S. M. Larson.  1.5-m reflector + CCD.
    
    Orbital elements:
        P/1998 X1 = 2006 B7 (ODAS)
    Epoch 1998 July 6.0 TT = JDT 2451000.5
    T 1998 July 20.93950 TT                                 MPC
    q   1.9742561            (2000.0)            P               Q
    n   0.14567569     Peri.   68.72718     +0.38059043     -0.92474360
    a   3.5772118      Node   358.90225     +0.83945094     +0.34569206
    e   0.4481020      Incl.    1.35186     +0.38790855     +0.15920516
    P   6.77
    
    Epoch 2005 Apr. 20.0 TT = JDT 2453480.5
    T 2005 May 3.25821 TT                                   MPC
    q   1.9808483            (2000.0)            P               Q
    n   0.14529402     Peri.   69.05285     +0.37818445     -0.92573012
    a   3.5834738      Node   358.72553     +0.84035950     +0.34354541
    e   0.4472268      Incl.    1.34843     +0.38829426     +0.15811484
    P   6.78
    Residuals in seconds of arc
    981215 910  0.3+  0.4-    981221 360  0.8+  0.8+    990213 691  0.6-  0.8+
    981215 910  0.2-  0.8-    981221 360  0.5+  0.2+    990213 691  0.1-  0.2-
    981215 910  0.5+  0.7-    981221 360  0.1-  0.5+    990213 691  0.7+  0.7+
    981216 046  0.5-  0.3+    981222 958  0.6+  0.9+    990214 693  0.3+  0.2-
    981216 046  0.8-  0.6-    981222 958  0.8-  0.5+    990214 693  0.4+  0.2-
    981216 046  0.5+  1.0-    981222 958  0.4+  0.1+    990214 693  0.3+  0.3-
    981216 557  0.5-  0.4-    981224 360  0.2-  0.2+    990214 360  0.3+  0.5-
    981216 910  0.4+  0.2-    981224 360  0.5-  0.6+    990214 360  0.5+  0.3-
    981216 046  0.6-  1.2-    981224 360  0.4+  0.1+    990214 360  0.3+  0.7-
    981216 046  1.1-  1.4-    981226 910  0.0   0.2-    990215 118  0.4+  0.3-
    981216 910  0.2+  0.1-    981227 958 (0.1-  4.0+)   990215 118  0.0   0.2+
    981216 910  0.0   0.4-    981227 958  1.9-  0.6+    990216 691  0.6-  0.5-
    981216 910  0.2-  0.5-    981227 402  0.4+  0.0     990216 691  0.0   0.0
    981216 910  0.4-  1.1-    981227 402  0.2+  0.4-    990216 691  1.0-  0.2-
    981216 586  0.6+  0.3+    981227 402  0.7+  0.1+    990216 615  0.6+  0.5+
    981216 910  0.1-  0.6-    990107 897  1.5-  1.7+    990216 615  0.9+  0.3-
    981216 586  0.5+  0.5+    990107 897  0.3+  1.4+    990216 615  0.1+  0.1+
    981216 586  0.6+  0.3+    990107 897  0.3-  1.6+    990216 615  0.5+  0.2+
    981216 586  0.7+  0.5+    990110 372  0.3-  1.2+    990216 615  0.1+  0.1+
    981216 586  0.5+  0.3+    990113 693  0.5-  0.0     990216 615  0.1-  0.1-
    981216 586  0.3+  0.3+    990113 693  0.5-  0.0     990216 615  0.2-  0.1+
    981216 586  0.3+  0.5+    990113 693  0.3-  0.1-    990216 615  0.6-  0.7+
    981216 586  0.4+  0.5+    990114 910  1.0+  0.0     990216 615  0.4+  0.1+
    981216 586  0.7+  0.5+    990114 910  1.1+  0.5-    990216 615  0.2+  0.5+
    981216 586  0.7+  0.4+    990114 910  0.3-  0.9-    990216 615  0.1+  0.5+
    981216 586  0.5+  0.5+    990115 910  0.3+  0.9-    990216 615  0.5-  0.3+
    981216 586  0.6+  0.6+    990115 910  0.8+  0.7-    990216 615  0.0   0.2+
    981216 586  0.6+  0.6+    990115 910  0.9+  1.3-    990216 615  0.0   0.1+
    981216 611  0.1+  0.7-    990115 910  0.1+  1.5-    990216 615  0.4+  0.5+
    981217 611 (2.7-  0.7-)   990115 910  0.4+  1.3-    990223 897 (1.4+  2.6+)
    981217 586  0.6-  0.3+    990115 910  0.0   0.5-    990223 897 (3.4+  0.1-)
    981217 586  0.1+  0.3+    990115 910  0.0   1.1-    990223 897  0.6+  0.9-
    981217 046  1.0-  0.3-    990119 910  0.4+  0.4+    990316 402  0.1-  0.2+
    981217 586  0.1-  0.0     990119 910  0.5+  0.2+    990316 402 (0.3-  2.5-)
    981217 046  0.9-  0.3+    990119 910  0.6+  0.0     990316 402  1.7-  1.3-
    981217 046  0.3+  0.0     990119 910  0.2-  0.0     990404 402  1.7-  0.2-
    981217 586  0.0   0.2+    990119 910  0.3+  0.2+    990404 402  0.1-  0.5-
    981217 046  0.2+  0.1+    990119 910  0.2+  0.2+    990414 693  2.2-  1.0-
    981217 046  0.6+  0.0     990119 910  0.1+  0.1+    990414 693 (5.1-  0.3+)
    981217 586  0.5-  0.2+    990119 910  0.3+  0.2+    051007 G96  1.8-  1.9-
    981217 586  0.2-  0.3+    990119 910  0.3+  0.0     051007 G96  1.0-  1.4-
    981217 586  0.5-  0.4+    990119 910  0.1+  0.6+    051007 G96  0.7+  1.7-
    981217 586  0.3-  0.3+    990121 360  0.8+  0.6-    060130 691  0.1-  0.1-
    981217 586  0.5-  0.4+    990121 360  0.7+  0.2-    060130 691  0.3-  0.4-
    981217 586  0.7-  0.2+    990121 360  0.3+  0.4-    060130 691  0.3-  0.4-
    981217 586  0.2-  0.4+    990126 402 (2.5+  0.8+)   060207 691  0.4-  0.1+
    981217 586  0.0   0.2+    990126 360  0.5+  0.1+    060207 691  0.3-  0.1-
    981218 511  0.1+  0.6+    990126 360  0.0   0.3-    060207 691  0.0   0.0
    981218 511  0.0   0.6+    990126 360  0.6+  0.2-    060220 691  0.2+  0.0
    981218 511  0.1-  0.3+    990205 897  0.8+  0.1+    060220 691  0.0   0.0
    981218 511  0.1-  0.4+    990205 897  0.3-  1.1-    060220 691  0.0   0.3+
    981218 511  0.2-  0.5+    990206 402  0.5+  0.7-    060224 691  0.3+  0.4+
    981218 511  0.0   0.5+    990206 402  1.0+  0.3-    060224 691  0.3+  0.2+
    981218 511  0.1-  0.5+    990206 402  1.4+  0.5+    060224 691  0.6+  0.9-
    981218 511  0.2-  0.7+    990208 402  1.6+  0.7-    060302 691  0.3-  0.1+
    981218 511  0.1-  0.6-    990208 402  1.7+  0.3-    060302 691  0.5+  0.5+
    981218 402  0.9-  0.5+    990208 402  1.5+  0.6-    060302 691  0.3+  0.4+
    981218 402  0.6-  0.3+    990212 699  0.4-  0.9+    060323 G96  1.2-  0.3+
    981218 402  0.3+  0.2+    990212 699  0.1-  0.1+    060323 G96  0.4+  0.3+
    981218 402  0.5-  0.6+    990212 699  0.1+  0.0     060323 G96  1.2-  0.4+
    981219 897  0.8-  1.6-    990213 691  0.3-  0.1-    060323 G96  0.4+  0.4+
    981219 897 (3.2-  1.7-)   990213 691  0.5-  0.2-    060324 G96  0.0   0.2+
    981219 372 (1.0+  2.2+)   990213 691  0.3+  0.1+    060324 G96  1.1+  0.1+
    981219 372 (0.7+  1.8+)   990213 691  0.1-  0.2-    060324 G96  0.5-  0.2+
    981220 897 (3.7-  0.1-)   990213 691  0.5-  0.5+    060324 G96  0.0   0.4+
    981221 372 (2.5+  0.5+)   990213 691  0.3-  0.4-
    
         The rediscovery of this comet by G. V. Williams in 2006 astrometric
    survey data was announced on 2008 Mar. 31 on IAUC 8929-8930, with the 2006
    observations simultaneously published on MPEC 2008-F63, together with another
    triplet of 1999 observations.  This rediscovery appears to be consistent with
    E. J. Christensen's tentative single-night recovery observations, given above.
    As noted on IAUC 8929, however, the linked orbit computation was decidedly
    unsatisfactory.  This was also true of attempts to include the A1 and A2
    nongravitational parameters.  Following a demonstration by S. Nakano of the
    apparent need also to include the A3 parameter, the linked orbital elements
    and residuals above were obtained by G. V. Williams from such a solution.
    The resulting nongravitational parameters are A1 = -2.79 +/- 0.27, A2 =
    +1.1966 +/- 0.2612, A3 = -2.2588 +/- 0.0268.
    
    Brian G. Marsden             (C) Copyright 2008 MPC           M.P.E.C. 2008-G10
    

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