OAA computing section circular NK 1608 97P/Metcalf-Brewington
The following improved orbital elements, by S. Nakano, are from 184 observations 1906 to 2000, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 1.37 arc seconds. The comet has passed 0.11 AU from Jupiter on 1993 Mar. 28 UT. See the orbits in NK 674 and MPC 41159 (= HICQ 2001). Epoch = 2001 Apr. 1.0 TT T = 2001 Apr. 14.98222 +/- 0.00104 (m.e.) TT Peri. = 229.71368 +/- 0.00007 Node = 186.43824 +/- 0.00006 (2000.0) Inc. = 17.98474 +/- 0.00014 q = 2.6108322 +/- 0.0000056 AU e = 0.4564543 +/- 0.0000010 a = 4.8033349 +/- 0.0000028 AU n' = 0.09362456 +/- 0.00000008 P = 10.527 +/- 0.0000092 years A1 = +0.507 +/- 0.045 A2 = +0.05990 +/- 0.00051 T = 1906 Oct. 10.08103 TT Epoch = 1906 Sept.27.0 TT Peri. = 199.77790 e = 0.5844907 Node = 195.87758 (2000.0) a = 3.9260152 AU Inc. = 14.62259 n'= 0.12669985 q = 1.6312959 AU P = 7.779 years [ T = 1914 June 7.57316 TT Epoch = 1914 May 28.0 TT Peri. = 203.02553 e = 0.5943263 Node = 190.83172 (2000.0) a = 3.9055308 AU Inc. = 13.49015 n'= 0.12769796 q = 1.5843712 AU P = 7.718 years ] [ T = 1922 Mar. 4.97586 TT Epoch = 1922 Mar. 7.0 TT Peri. = 203.11464 e = 0.5931490 Node = 190.74808 (2000.0) a = 3.9171625 AU Inc. = 13.46742 n'= 0.12712961 q = 1.5937014 AU P = 7.753 years ] [ T = 1929 Nov. 29.66047 TT Epoch = 1929 Dec. 15.0 TT Peri. = 203.20609 e = 0.5939452 Node = 190.73718 (2000.0) a = 3.9075040 AU Inc. = 13.47385 n'= 0.12760125 q = 1.5866607 AU P = 7.724 years ] [ T = 1937 July 29.33731 TT Epoch = 1937 Aug. 15.0 TT Peri. = 206.12231 e = 0.6054337 Node = 188.39183 (2000.0) a = 3.8432697 AU Inc. = 13.16540 n'= 0.13081356 q = 1.5164249 AU P = 7.534 years ] [ T = 1945 Feb. 15.97315 TT Epoch = 1945 Mar. 6.0 TT Peri. = 206.25352 e = 0.6047252 Node = 188.29129 (2000.0) a = 3.8492221 AU Inc. = 13.15066 n'= 0.13051025 q = 1.5215006 AU P = 7.552 years ] [ T = 1952 Sept. 4.09522 TT Epoch = 1952 Aug. 16.0 TT Peri. = 206.27478 e = 0.6048035 Node = 188.33368 (2000.0) a = 3.8503290 AU Inc. = 13.14979 n'= 0.13045397 q = 1.5216364 AU P = 7.555 years ] [ T = 1960 Mar. 21.81341 TT Epoch = 1960 Mar. 7.0 TT Peri. = 206.43257 e = 0.6049335 Node = 188.24573 (2000.0) a = 3.8459987 AU Inc. = 13.12660 n'= 0.13067436 q = 1.5194253 AU P = 7.542 years ] [ T = 1967 Oct. 7.93380 TT Epoch = 1967 Sept.27.0 TT Peri. = 206.52182 e = 0.6055376 Node = 188.16422 (2000.0) a = 3.8427084 AU Inc. = 13.13181 n'= 0.13084223 q = 1.5158039 AU P = 7.533 years ] [ T = 1975 June 22.97147 TT Epoch = 1975 July 7.0 TT Peri. = 207.92699 e = 0.5940910 Node = 187.89886 (2000.0) a = 3.9186550 AU Inc. = 13.04101 n'= 0.12705698 q = 1.5906172 AU P = 7.757 years ] [ T = 1983 Mar. 28.62867 TT Epoch = 1983 Apr. 16.0 TT Peri. = 207.95417 e = 0.5932597 Node = 187.87632 (2000.0) a = 3.9268795 AU Inc. = 13.02141 n'= 0.12665802 q = 1.5972202 AU P = 7.782 years ] T = 1991 Jan. 5.62635 TT Epoch = 1991 Jan. 24.0 TT Peri. = 208.04854 e = 0.5938330 Node = 187.78785 (2000.0) a = 3.9183361 AU Inc. = 13.02814 n'= 0.12707249 q = 1.5914988 AU P = 7.756 years The predicted orbit for the 2011 return is as follows: T = 2011 Aug. 21.00157 TT Epoch = 2011 Aug. 27.0 TT Peri. = 228.20944 e = 0.4593594 Node = 185.20794 (2000.0) a = 4.8027439 AU Inc. = 17.88575 n'= 0.09364184 q = 2.5965584 AU P = 10.525 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1906/ 061218 531 1.8+ 0.4- 910208 323 2.5+ 0.7+ 061115 803 2.4- 1.0+ 061218 522 (4.3+ 1.0-) 910209 801 1.7+ 0.7+ 061117 786 0.8- 3.2- 061218 020 (1.2+ 5.4+) 910211 801 2.6+ 0.4+ 061119 020 2.2- 3.4- 061219 765 (4.8+ 1.3-) 910216 801 2.4+ 0.8- 061119 014 (8.6- 7.0-) 061220 051 2.4- 3.0+ 910217 046 1.8+ 1.2- 061120 741 (6.8+ 3.0+) 061220 531 (7.2- 7.5-) 910217 046 0.9+ 0.1+ 061120 020 1.4+ 1.4- 061221 051 3.5- 3.1+ 910218 046 1.7+ 1.4- 061120 051 (6.2- 0.2-) 061221 051 (6.5- 8.7+) 910218 046 (3.4+ 0.1-) 061120 517 (5.3+ 0.2+) 1907/ 910302 984 (3.5+ 3.8-) 061120 045 0.6- 2.8- 070105 020 0.9+ 1.0+ 910303 897 (4.5+ 0.2-) 061120 020 0.4- 2.9+ 070105 020 (4.2+ 6.5+) 910303 897 (3.9+ 5.8+) 061120 051 (6.8- 1.5+) 070106 786 (6.8+ 0.1-) 910403 372 0.1+ 0.7- 061120 014 2.3- 0.8- 070107 020 0.1+ 1.5+ 910403 372 (3.1+ 1.4-) 061120 020 2.6- 1.1- 070108 020 3.0+ 0.3- 2000/ 061120 522 (1.1+ 4.0-) 070111 786 2.5+ 3.8+ 000901 704 0.5+ 0.5+ 061121 007 1.6- 0.9- 070112 051 2.2+ 2.9+ 000901 704 0.1+ 0.8+ 061121 513 1.2- 1.3- 070116 020 (7.6+ 1.8+) 000901 704 0.6+ 0.7- 061121 051 0.5+ 0.8+ 1991/ 000901 704 0.1- 0.5+ 061121 051 (9.1- 5.3-) 910105 412 (4.9+ 3.8-) 000902 699 (2.4- 0.5-) 061121 020 1.0+ 0.7+ 910105 412 (1.3- 3.5-) 000902 699 0.5- 0.6- 061121 045 3.8+ 0.9+ 910107 897 (4.6+ 0.1-) 000902 699 0.9- 0.1- 061121 014 (4.2- 7.6-) 910107 897 (3.7+ 0.8+) 000902 699 0.0 0.5- 061122 786 0.8- 1.6- 910108 413 0.1- 0.6+ 000903 704 0.4- 1.7+ 061122 020 2.3- 3.1- 910108 026 0.1- 0.8+ 000903 704 0.6+ 0.6+ 061122 020 0.4+ 1.0- 910109 411 1.2- 0.4+ 000905 704 1.0+ 1.2+ 061122 531 (1.5+ 6.0-) 910109 411 0.4- 0.0 000905 704 0.7+ 1.6+ 061122 531 1.4- 3.2- 910109 413 0.4+ 0.9+ 000905 704 1.0+ 1.3+ 061122 014 0.5- 0.5- 910109 413 0.9- 0.4- 000905 704 0.3+ 1.6+ 061122 020 2.5- 1.6- 910109 372 0.8- 0.0 000909 540 0.0 0.2- 061122 999 (1.8+ 9.2+) 910109 372 0.8- 1.1+ 000909 540 1.0- 0.7+ 061123 015(14.2- 3.4-) 910109 323 0.4+ 0.7- 000909 540 0.0 0.7+ 061123 765 1.4+ 0.4- 910109 026 1.5- 1.6- 000924 704 0.2+ 0.5+ 061123 786 0.8- 0.7- 910110 897 0.3- 0.8- 000924 691 1.0- 0.1- 061123 020 0.2+ 1.2+ 910110 897 1.7+ 0.7- 000924 704 0.3- 0.5+ 061123 014 (5.8+ 1.9-) 910110 401 0.4- 0.7- 000924 704 1.3- 0.3+ 061123 999 (4.3- 6.3-) 910110 401 1.1- 1.0- 000924 691 0.4- 0.1+ 061123 531 3.6+ 2.6- 910110 323 0.2- 0.3- 000924 704 0.3- 0.5- 061123 016 (1.0- 4.1-) 910110 503 0.1+ 0.5+ 000924 691 0.1- 1.6+ 061124 803 2.6+ 0.4- 910111 415 0.6- 0.6+ 000926 704 0.5+ 0.2+ 061124 741 1.0+ 2.8+ 910111 415 0.8- 0.8+ 000926 704 0.6+ 0.8+ 061124 786 1.0- 2.1- 910111 323 0.8+ 1.2- 000926 704 0.1+ 0.3+ 061125 786 0.1- 0.9- 910112 372 0.6- 1.9+ 000926 704 0.4+ 0.1+ 061125 765 (1.6- 5.5-) 910112 474 (2.8- 1.3+) 000926 704 0.2+ 0.1- 061126 531 (4.2+ 5.7-) 910112 474 1.8- 2.0+ 000926 360 0.2+ 0.7+ 061127 531 0.3+ 0.3+ 910113 372 0.6- 0.2+ 000926 360 0.3- 1.2+ 061204 020 (4.2- 4.6-) 910113 984 0.0 0.0 000926 360 0.1- 0.5+ 061204 051 0.0 0.7- 910113 801 0.4+ 0.2- 001001 704 0.4+ 1.5+ 061204 051 (6.7- 3.2-) 910113 801 0.2+ 0.1- 001001 704 0.2+ 1.0+ 061205 786 0.9- 3.0- 910113 801 0.2+ 0.1- 001001 704 0.9- 0.5+ 061205 051 2.1- 0.6- 910114 503 0.0 0.4- 001002 704 0.1+ 1.5+ 061205 008 2.7+ 3.0+ 910115 897 0.5+ 0.5- 001002 704 0.7+ 1.3+ 061205 008 1.5- 1.6- 910115 372 0.2+ 0.4- 001002 704 0.7+ 1.8+ 061205 008 0.9+ 2.6+ 910115 364 0.5- 1.1- 001002 704 0.5- 1.7+ 061205 051 (0.0 6.5+) 910115 364 0.6- 0.3- 001002 704 0.4+ 1.8+ 061206 662 2.3- 0.6+ 910115 875 1.1- 0.1+ 001005 402 1.1+ 1.7+ 061206 051 0.3+ 1.6+ 910115 875 2.3- 0.3- 001005 402 0.0 0.7+ 061206 531 3.4+ 1.5- 910117 474 1.4- 1.1+ 001005 402 0.3+ 0.4+ 061206 531 (7.6+ 1.5-) 910117 474 1.8- 0.1+ 001029 704 (0.5+ 3.6+) 061207 020 (0.1- 6.4+) 910117 364 0.2- 2.6- 001029 704 0.0 1.3+ 061207 051 0.4+ 3.9+ 910117 364 0.4+ 1.2- 001029 704 1.0- 0.6+ 061207 051 2.2- 2.2+ 910117 984 1.6- 1.1- 001029 704 0.2- 0.0 061207 020(10.9- 0.3+) 910117 801 0.4+ 1.3- 001103 360 0.2+ 1.0+ 061207 521(10.9- 2.5-) 910118 026 1.5+ 0.7- 001103 360 0.4+ 2.0+ 061207 015(12.3- 3.3-) 910119 897 0.8- 1.1- 001118 699 1.0- 2.1+ 061208 008 0.6+ 1.2- 910119 897 0.2- 0.8+ 001118 699 0.9+ 2.1+ 061208 008 (8.2- 0.3+) 910119 897 2.6+ 0.4- 001118 699 0.1+ 0.5+ 061208 521 (1.2+ 22.8+) 910120 657 0.2+ 0.0 001118 699 1.5- 1.5+ 061210 020 2.6- 1.1+ 910122 364 0.1+ 1.1+ 001119 699 (0.3+ 2.6+) 061210 051 (5.5- 3.2+) 910122 364 1.6+ 0.3- 001119 699 0.3+ 1.3+ 061210 020 2.7- 1.1- 910125 046 0.8- 1.3- 001119 699 (0.2- 3.0+) 061210 531 (5.4+ 0.4-) 910125 046 2.2- 0.3+ 001119 699 0.1+ 1.5+ 061211 020 1.2- 1.1+ 910201 046 2.0+ 1.1- 001122 360 0.6- 1.7+ 061211 531 1.4+ 0.2+ 910201 046 2.3+ 0.0 001122 360 1.1- 2.2+ 061212 786 0.4- 0.3+ 910202 056 (5.2+ 0.4-) 001129 322 1.9+ 0.0 061212 020 1.7- 2.4+ 910202 046 1.0- 1.2- 001129 322 (3.4+ 0.8+) 061212 020 2.5- 1.3+ 910202 046 0.5- 0.1- 001129 322 1.4- 0.8- 061213 765 0.5- 1.1- 910202 056 (6.5+ 2.1-) 001215 402 0.7- 0.5+ 061213 051 0.0 0.8- 910203 056 (4.9+ 1.2-) 001215 402 0.2- 1.2+ 061213 051 (4.0+ 4.1-) 910203 056 (6.3+ 0.9-) 001215 402 (0.1+ 2.6+) 061215 531 (4.3+ 1.1+) 910204 323 1.7+ 1.1- 001222 360 (2.3- 1.4+) 061215 051 0.1- 2.6+ 910204 026 0.7- 1.6- 001222 360 2.2- 1.2+ 061215 020 (4.2- 2.5+) 910205 323 (3.8+ 1.2-) 001223 704 (2.6- 1.9+) 061217 522 2.2+ 1.9+ 910206 323 2.4+ 0.8- 001223 704 2.0- 1.9+ 061218 051 1.9- 1.0+ 910207 323 (3.2+ 0.4-) 001223 704 (3.0- 0.5+) ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2008 May 5