OAA computing section circular NK 674 97P/Metcalf-Brewington 1906V2

The following improved orbital elements, by S. Nakano, are from 115 observations 1906-1991, including planetary perturbations by Mercury to Neptune and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga and non-gravitational effect of style II. The mean residual is +/- 1.38 arc seconds. Epoch = 1991 Jan. 24.0 TT T = 1991 Jan. 5.61150 +/- 0.00393 (m.e.) TT Peri. = 208.04080 +/- 0.00281 Node = 187.78667 +/- 0.00061 (2000.0) Inc. = 13.02776 +/- 0.00017 q = 1.5914685 +/- 0.0000059 AU e = 0.5938413 +/- 0.0000019 a = 3.9183421 +/- 0.0000024 AU n' = 0.12707220 +/- 0.00000012 P = 7.756 +/- 0.0000071 years A1 = +0.669 +/- 0.055 A2 = +0.06566 +/- 0.00177 T = 1906 Oct. 10.08044 TT Epoch = 1906 Sept.27.0 TT Peri. = 199.77866 e = 0.5844921 Node = 195.87574 (2000.0) a = 3.9259649 AU Inc. = 14.62202 n'= 0.12670229 q = 1.6312696 AU P = 7.779 years ] [ T = 1914 June 7.53802 TT Epoch = 1914 May 28.0 TT Peri. = 203.02625 e = 0.5943283 Node = 190.82925 (2000.0) a = 3.9054828 AU Inc. = 13.48948 n'= 0.12770032 q = 1.5843437 AU P = 7.718 years ] [ T = 1922 Mar. 4.91100 TT Epoch = 1922 Mar. 7.0 TT Peri. = 203.11464 e = 0.5931517 Node = 190.74561 (2000.0) a = 3.9171200 AU Inc. = 13.46676 n'= 0.12713167 q = 1.5936736 AU P = 7.753 years ] [ T = 1929 Nov. 29.57198 TT Epoch = 1929 Dec. 15.0 TT Peri. = 203.20536 e = 0.5939486 Node = 190.73472 (2000.0) a = 3.9074704 AU Inc. = 13.47319 n'= 0.12760290 q = 1.5866339 AU P = 7.724 years ] [ T = 1937 July 29.23680 TT Epoch = 1937 Aug. 15.0 TT Peri. = 206.11984 e = 0.6054352 Node = 188.39051 (2000.0) a = 3.8432452 AU Inc. = 13.16491 n'= 0.13081481 q = 1.5164094 AU P = 7.534 years ] [ T = 1945 Feb. 15.86990 TT Epoch = 1945 Mar. 6.0 TT Peri. = 206.25033 e = 0.6047274 Node = 188.28997 (2000.0) a = 3.8492026 AU Inc. = 13.15018 n'= 0.13051124 q = 1.5214843 AU P = 7.552 years ] [ T = 1952 Sept. 3.99740 TT Epoch = 1952 Aug. 16.0 TT Peri. = 206.27106 e = 0.6048060 Node = 188.33235 (2000.0) a = 3.8503185 AU Inc. = 13.14930 n'= 0.13045451 q = 1.5216227 AU P = 7.555 years ] [ T = 1960 Mar. 21.72964 TT Epoch = 1960 Mar. 7.0 TT Peri. = 206.42811 e = 0.6049363 Node = 188.24443 (2000.0) a = 3.8459952 AU Inc. = 13.12611 n'= 0.13067454 q = 1.5194130 AU P = 7.542 years ] [ T = 1967 Oct. 7.87137 TT Epoch = 1967 Sept.27.0 TT Peri. = 206.51663 e = 0.6055410 Node = 188.16292 (2000.0) a = 3.8427101 AU Inc. = 13.13133 n'= 0.13084214 q = 1.5157917 AU P = 7.533 years ] [ T = 1975 June 22.92086 TT Epoch = 1975 July 7.0 TT Peri. = 207.92060 e = 0.5940980 Node = 187.89766 (2000.0) a = 3.9186490 AU Inc. = 13.04064 n'= 0.12705727 q = 1.5905874 AU P = 7.757 years ] [ T = 1983 Mar. 28.59313 TT Epoch = 1983 Apr. 16.0 TT Peri. = 207.94711 e = 0.5932676 Node = 187.87514 (2000.0) a = 3.9268790 AU Inc. = 13.02103 n'= 0.12665805 q = 1.5971888 AU P = 7.782 years ] The predicted orbit for the 2001 return is as follows: T = 2001 Apr. 10.24198 TT Epoch = 2001 Apr. 1.0 TT Peri. = 229.59064 e = 0.4571376 Node = 186.43475 (2000.0) a = 4.7993825 AU Inc. = 17.95453 n'= 0.09374023 q = 2.6054041 AU P = 10.514 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 061115 803 1.5- 2.2+ Y 061206 531 (3.9+ 1.3-) 910109 372 0.0 1.8+ 061117 786 0.0 2.1- 061206 531 (8.1+ 1.3-) 910109 026 0.7- 0.9- 061119 020 1.5- 2.4- 061207 020 (0.3+ 6.4+) 910110 897 0.5+ 0.1- 061119 014 (7.8- 6.1-) 061207 051 (0.9+ 4.0+) 910110 897 2.4+ 0.1- 061120 741 (7.5+ 4.1+) 061207 051 1.7- 2.3+ 910110 401 0.3+ 0.0 061120 020 2.1+ 0.4- 061207 020(10.5- 0.3+) 910110 401 0.3- 0.4- 061120 051 (5.5- 0.7+) 061207 521(10.5- 2.5-) 910110 503 0.8+ 1.1+ 061120 517 (6.0+ 1.2+) 061207 015(11.7- 3.3-) 910111 415 0.1+ 1.1+ 061120 045 0.1+ 1.8- 061208 008 1.0+ 1.2- 910111 415 0.1- 1.4+ 061120 020 (0.2+ 3.9+) 061208 008 (7.8- 0.2+) 910112 372 0.0 2.4+ 061120 051 (6.1- 2.4+) 061208 521 (1.5+ 22.8+) 910112 474 2.3- 1.8+ 061120 014 1.6- 0.1+ 061210 020 2.2- 0.9+ 910112 474 1.3- 2.5+ 061120 020 1.9- 0.1- 061210 051 (5.1- 3.0+) 910113 372 0.3- 0.7+ 061120 522 1.8+ 3.0- 061210 020 2.3- 1.2- 910113 984 0.4+ 0.5+ 061121 007 0.9- 0.1+ 061210 531 (5.8+ 0.4-) 910113 801 0.8+ 0.3+ 061121 513 0.4- 0.3- 061211 020 0.9- 0.9+ 910113 801 0.6+ 0.4+ 061121 051 1.3+ 1.7+ 061211 531 1.7+ 0.0 910113 801 0.6+ 0.3+ 061121 051 (8.4- 4.4-) 061212 786 0.0 0.1+ 910114 503 0.2+ 0.0 061121 020 1.6+ 1.6+ 061212 020 1.3- 2.2+ 910115 897 0.7+ 0.2- 061121 045 (4.5+ 1.9+) 061212 020 2.1- 1.0+ 910115 372 0.3+ 0.0 061121 014 (3.5- 6.7-) 061213 765 0.1- 1.3- 910115 364 0.3- 0.7- 061122 786 0.1- 0.7- 061213 051 0.3+ 1.1- 910115 364 0.5- 0.0 061122 020 1.5- 2.2- 061213 051 (4.4+ 4.4-) 910115 875 1.0- 0.5+ 061122 020 1.1+ 0.0 061215 531 (4.5+ 0.7+) 910115 875 2.2- 0.0 061122 531 (2.2+ 5.1-) 061215 051 0.2+ 2.2+ 910117 474 1.5- 1.3+ 061122 531 0.6- 2.4- 061215 020 (3.9- 2.1+) 910117 474 1.9- 0.3+ 061122 014 0.2+ 0.4+ 061217 522 2.4+ 1.5+ 910117 364 0.3- 2.3- 061122 020 1.7- 0.8- 061218 051 1.6- 0.4+ 910117 364 0.3+ 1.0- 061122 999 (2.5+ 10.1+) 061218 531 2.0+ 1.0- 910117 984 1.7- 0.9- 061123 015(13.4- 2.5-) 061218 522 (4.5+ 1.6-) 910117 801 0.3+ 1.1- 061123 765 2.1+ 0.5+ 061218 020 (1.4+ 4.8+) 910119 897 1.0- 0.9- 061123 786 0.1- 0.2+ 061219 765 (5.1+ 1.8-) 910119 897 0.5- 1.0+ 061123 020 0.8+ 2.1+ 061220 051 2.3- 2.3+ 910119 897 2.3+ 0.3- 061123 014 (6.6+ 1.1-) 061220 531 (7.0- 8.2-) 910120 657 0.1- 0.2+ 061123 999 (3.6- 5.5-) 061221 051 3.3- 2.3+ 910122 364 0.4- 1.1+ 061123 531 (4.3+ 1.7-) 061221 051 (6.3- 7.9+) 910122 364 1.1+ 0.3- 061123 016 0.3- 3.3- 070105 020 0.7+ 0.3- 910125 046 1.5- 1.5- 061124 803 3.2+ 0.5+ 070105 020 (4.1+ 5.1+) 910125 046 (2.9- 0.2+) 061124 741 (1.6+ 3.7+) 070106 786 (6.6+ 1.5-) 910201 046 0.8+ 1.5- 061124 786 0.3- 1.3- 070107 020 0.1- 0.0 910201 046 1.2+ 0.5- 061125 786 0.6+ 0.1- 070108 020 2.8+ 1.7- 910202 046 2.1- 1.7- 061125 765 (0.9- 4.7-) 070111 786 2.2+ 2.3+ 910202 046 1.7- 0.6- 061126 531 (4.9+ 4.9-) 070112 051 1.9+ 1.4+ 910209 801 0.1+ 0.1- 061127 531 0.9+ 1.0+ 070116 020 (7.3+ 0.1+) 910211 801 0.9+ 0.3- 061204 020 (3.6- 4.5-) 910105 412 (6.2+ 3.0-) 910216 801 0.6+ 1.6- 061204 051 0.6+ 0.5- 910105 412 0.0 2.6- 910217 046 0.0 2.0- 061204 051 (6.0- 3.0-) 910107 897 (5.8+ 0.7+) 910217 046 0.8- 0.8- 061205 786 0.4- 2.8- 910107 897 (4.8+ 1.5+) 910218 046 0.2- 2.2- 061205 051 1.6- 0.5- 910108 413 0.8+ 1.3+ 910218 046 1.5+ 1.0- 061205 008 3.1+ 3.2+ 910108 026 0.9+ 1.4+ 910302 984 (1.5+ 4.8-) 061205 008 1.0- 1.4- 910109 411 0.3- 1.1+ 910303 897 2.5+ 1.3- 061205 008 1.5+ 2.8+ 910109 411 0.5+ 0.6+ 910303 897 (2.0+ 4.7+) 061205 051 (0.5+ 6.6+) 910109 413 1.3+ 1.5+ 910403 372 0.8- 1.8- 061206 662 1.9- 0.7+ Y 910109 413 0.1- 0.3+ 910403 372 2.0+ 2.5- 061206 051 0.9+ 1.7+ 910109 372 0.1+ 0.7+ ( ) -------- Rejected Obs.

Director, Computing Section Computed date Syuichi Nakano 1991 Aug. 8

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