OAA computing section circular NK 1210 85P/Boethin
The following improved orbital elements, by S. Nakano, are from 52 observations 1975 to 1986. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.36 arc seconds. This is only re-computation for NK 608. Epoch = 1986 Jan. 10.0 TT T = 1986 Jan. 16.42492 +/- 0.00039 (m.e.) TT Peri. = 11.67424 +/- 0.00099 Node = 26.48147 +/- 0.00098 (2000.0) Inc. = 5.75640 +/- 0.00007 q = 1.1143245 +/- 0.0000023 AU e = 0.7777280 +/- 0.0000005 a = 5.0133385 +/- 0.0000029 AU n' = 0.08780385 +/- 0.00000008 P = 11.225 +/- 0.0000098 years T = 1975 Jan. 5.61481 TT Epoch = 1974 Dec. 19.0 TT Peri. = 11.13914 e = 0.7792244 Node = 27.64037 (2000.0) a = 4.9531149 AU Inc. = 5.91702 n'= 0.08941008 q = 1.0935271 AU P = 11.023 years [ T = 1997 Apr. 17.70270 TT Epoch = 1997 Apr. 22.0 TT Peri. = 22.32458 e = 0.7743648 Node = 14.41916 (2000.0) a = 5.1328814 AU Inc. = 4.87677 n'= 0.08475440 q = 1.1581586 AU P = 11.629 years ] The predicted orbit for the 2008 return is as follows: T = 2008 Dec. 16.35907 TT Epoch = 2008 Nov. 30.0 TT Peri. = 53.58138 e = 0.7752848 Node = 343.45153 (2000.0) a = 5.1062984 AU Inc. = 4.21699 n'= 0.08541709 q = 1.1474627 AU P = 11.539 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1975/ 750213 385 1.9+ 1.3+ 851006 372(11.7+ 6.8-)Y 750205 385 0.2+ 0.1+ 750215 385 0.6- 1.6- 851006 372 (2.8- 7.1-)Y 750205 385 2.3+ 1.7+ 750215 385 2.4+ 1.8+ 851011 474 (1.6- 3.2+) 750208 380 0.6+ 0.6+ 750228 372 1.4- 0.3+ 851011 474 0.2- 1.9+ 750208 372 0.4+ 0.2+ 750228 046 (5.3- 0.0 ) 851015 323 0.8- 0.3+ 750208 372 (0.9- 3.0+) 750303 688 0.9- 1.5- 851016 474 2.1- 0.4- 750208 801 (9.0- 3.8+) 750303 372 (3.8- 0.3+)Y 851016 474 0.3- 0.2- 750209 801 2.6- 0.3- 750305 801 2.0- 0.0 851108 474 0.3+ 1.1+ 750209 385 0.5- 0.4- 750307 691 2.8- 1.4+ 851109 474 0.2- 1.8+ 750209 385 2.6- 1.3- 750307 691 2.3- 1.6+ 851109 474 0.1- 1.3+ 750209 387 (1.1- 3.9+) 750307 372 (4.4- 0.4-) 851117 707 0.0 0.2- 750209 882 2.0+ 0.1+ 750310 702 1.2+ 0.2+ 851202 323 0.2+ 0.9+ 750209 380 0.4+ 0.9+ 750314 702 2.2+ 2.6- 851211 657 2.4+ 0.7- 750209 380 0.5- 0.9- 750314 693 1.5- 1.2+ 851212 657 0.4+ 1.8+ 750210 385 (1.5+ 3.7+) 750314 693 0.9- 0.3+ 1986/ 750210 056 (1.0+ 3.0+) 750316 372 (0.3- 3.0+)Y 860103 984 (7.2- 5.6+) 750210 046 0.7- 0.3+ 750330 993 (2.9- 3.1-) 860111 503 1.1+ 0.9- 750211 387 1.3+ 2.0+ 750403 372 (4.3+ 0.4-)Y 860111 984 (3.9- 7.7-) 750211 385 0.4- 1.7- 750409 693 2.0+ 0.3+ 860111 576 1.4+ 0.5- 750211 372 0.4- 0.0 750409 693 1.5+ 0.5+ 860113 491 2.8- 2.3- 750211 372 2.0- 0.9- 750429 801 1.4- 0.5+ 860114 491 0.6- 1.9- 750211 046 0.7- 0.8- 750430 801 1.4- 1.3+ 860115 984 (0.5- 5.2+) 750212 046 2.1+ 1.3- 750504 691 1.7+ 0.1- 860119 984 2.1+ 0.4+ 750213 385 (3.0+ 1.6+) 750603 691 2.1+ 1.2+ 860301 657 (5.9- 4.4-) 750213 385 2.1+ 1.7+ 1985/ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2005 July 26