OAA computing section circular NK 835 18D/Perrine-Mrkos

The following improved orbital elements, by S. Nakano, are from 17 observations 1961 to 1969. Perturbations by Mercury to Neptune and five minor planets were taken into account. The mean residual is +/- 1.87 arc seconds. See an orbit in NK 573. Epoch = 1968 Oct. 31.0 TT T = 1968 Nov. 1.53840 +/- 0.00072 (m.e.) TT Peri. = 166.04555 +/- 0.00060 Node = 240.87605 +/- 0.00019 (2000.0) Inc. = 17.75921 +/- 0.00019 q = 1.2722140 +/- 0.0000035 AU e = 0.6426287 +/- 0.0000010 a = 3.5599224 +/- 0.0000013 AU n' = 0.14673823 +/- 0.00000008 P = 6.717 +/- 0.0000036 years T = 1962 Feb. 12.76917 TT Epoch = 1962 Feb. 25.0 TT Peri. = 165.94200 e = 0.6431400 Node = 240.94388 (2000.0) a = 3.5557056 AU Inc. = 17.76391 n'= 0.14699934 q = 1.2688891 AU P = 6.705 years The predicted orbit for the 2002 return is as follows: T = 2002 Sept.10.39466 TT Epoch = 2002 Sept. 3.0 TT Peri. = 166.64437 e = 0.6395146 Node = 240.55707 (2000.0) a = 3.5708626 AU Inc. = 17.86440 n'= 0.14606439 q = 1.2872440 AU P = 6.748 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 611129 689 2.3+ 0.4+ 681024 370 1.0+ 2.8+ 681216 370 (4.8- 3.3+) 611202 689 1.9+ 0.1+ 681120 675 0.1+ 0.1- 681217 675 0.2+ 1.2+ 611226 689 0.2+ 0.2+ 681121 675 3.4- 1.2+ 681219 380 (1.4+ 6.9+) 611231 689 0.1- 0.8- 681122 675 1.7+ 3.1- 681224 370 3.4- 2.3+ 620128 689 3.1- 0.4+ 681212 808 1.6+ 1.8- 681226 370 1.5- 2.8+ 620203 689 0.6- 1.4- 681213 808 3.3+ 3.3- 690113 370 (6.9+ 3.7-) 620304 689 1.2+ 2.1- 681214 808 0.4+ 0.6+ 620405 689 (6.8+ 0.8-) 681215 370 (0.7- 5.4+) ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2002 Dec. 23

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