OAA computing section circular NK 631 60P/Tsuchinshan 2

The following improved orbital elements, by S. Nakano, are from 47 observations 1965 to 1992, including planetary perturbations by Mercury to Pluto and five minor planets and non-gravitational effect of style II. The mean residual is +/- 1.00 arc seconds. Epoch = 1992 May 18.0 TT T = 1992 May 20.06808 +/- 0.00307 (m.e.) TT Peri. = 203.09912 +/- 0.00095 Node = 288.34369 +/- 0.00030 (2000.0) Inc. = 6.71764 +/- 0.00004 q = 1.7821495 +/- 0.0000034 AU e = 0.5044039 +/- 0.0000014 a = 3.5959716 +/- 0.0000034 AU n' = 0.14453722 +/- 0.00000020 P = 6.819 +/- 0.0000097 years A1 = -0.016 +/- 0.105 A2 = -0.00404 +/- 0.00048 T = 1965 Feb. 9.29300 TT Epoch = 1965 Feb. 9.0 TT Peri. = 202.95681 e = 0.5065280 Node = 288.46479 (2000.0) a = 3.5847591 AU Inc. = 6.73711 n'= 0.14521588 q = 1.7689784 AU P = 6.787 years T = 1971 Nov. 29.91998 TT Epoch = 1971 Nov. 25.0 TT Peri. = 203.11297 e = 0.5055315 Node = 288.38190 (2000.0) a = 3.5898405 AU Inc. = 6.72838 n'= 0.14490766 q = 1.7750629 AU P = 6.802 years T = 1978 Sept.20.98864 TT Epoch = 1978 Sept. 9.0 TT Peri. = 203.12806 e = 0.5041482 Node = 288.38906 (2000.0) a = 3.5989918 AU Inc. = 6.71748 n'= 0.14435532 q = 1.7845666 AU P = 6.828 years T = 1985 July 21.16722 TT Epoch = 1985 Aug. 3.0 TT Peri. = 203.10093 e = 0.5023950 Node = 288.35569 (2000.0) a = 3.6055146 AU Inc. = 6.70557 n'= 0.14396376 q = 1.7941221 AU P = 6.846 years The predicted orbit for the 1999 return is as follows: T = 1999 Mar. 8.17632 TT Epoch = 1999 Mar. 3.0 TT Peri. = 203.18483 e = 0.5063609 Node = 288.20089 (2000.0) a = 3.5863504 AU Inc. = 6.71646 n'= 0.14511924 q = 1.7703628 AU P = 6.792 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 650111 330 1.5- 0.2+ 710922 691 0.3+ 0.2+ 720419 805 0.9- 0.9+ 650113 330 0.6+ 0.1- 711015 691 2.0+ 0.7+ 720518 691 1.0+ 0.7- 650114 330 0.4- 0.1- 711015 691 1.8+ 0.6+ 781029 372(10.5- 2.5-) 650126 330 1.6- 1.6- 711122 693 0.7- 0.5+ 781029 372 (9.5- 2.4+) 650202 330 1.8- 0.5- 711122 693 0.5- 0.7+ 781201 801 2.7- 1.3+ 650211 330 1.0- 0.4- 711216 693 0.8- 0.7+ 850410 675 0.7+ 0.1- 650223 330 0.1+ 0.8- 711216 693 0.5- 0.2+ 850410 675 1.9+ 0.3+ 650304 330 0.2+ 0.2- 711228 370 (3.2- 2.0+) 850508 675 0.8- 0.6- 650309 324 (5.5+ 3.6-) 720113 370 (6.9- 3.5+) 850508 675 0.3+ 0.4- 650310 689 0.7+ 0.2+ 720113 370 (2.8- 4.7+) 911203 691 0.2- 0.6+ 650310 689 0.4- 0.1+ 720115 380 (4.3- 2.1+) 911203 691 0.3+ 0.4+ 650327 330 (6.4- 1.5-) 720115 380 (1.1- 5.1+) 911203 691 1.4- 0.3- 650401 689 2.2+ 0.8+ 720117 370 (6.6- 4.0+) 911213 691 0.2+ 0.4+ 650401 689 2.0+ 0.7+ 720122 806 (2.8- 0.2+) 911213 691 0.9+ 0.3+ 650419 689 1.8+ 0.8+ 720122 370 (8.8- 4.5+) 911213 691 1.0- 0.1+ 650419 689 2.2+ 0.5+ 720126 806 (5.4- 1.0+) 920128 691 0.1+ 0.1+ 650424 324 (5.5+ 1.8+) 720310 691 0.9- 1.4- 920129 691 0.7+ 0.6+ 650531 689 0.2+ 1.4+ 720310 691 0.5- 1.5- 920129 691 0.2+ 0.4+ 650531 689 0.9+ 1.4+ 720409 805 1.1- 2.2+ 920129 691 0.4- 0.1- 710919 693 1.3+ 1.2- 720417 691 1.2+ 1.1- 710922 691 0.5- 0.6+ 720417 691 1.5+ 1.2- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1996 Apr. 10

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