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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