OAA computing section circular NK 608 Periodic Comet Boethin (85P)

The following improved orbital elements, by S. Nakano, are from 52 observations 1975 to 1986. Perturbations by Mercury to Pluto and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga were taken into account. The mean residual is +/- 1.36 arc seconds. Epoch = 1986 Jan. 10.0 TT T = 1986 Jan. 16.42491 +/- 0.00039 (m.e.) TT Peri. = 11.67448 +/- 0.00124 Node = 26.48116 +/- 0.00123 (2000.0) Inc. = 5.75639 +/- 0.00010 q = 1.1143255 +/- 0.0000023 AU e = 0.7777279 +/- 0.0000005 a = 5.0133384 +/- 0.0000003 AU n' = 0.08780385 +/- 0.00000001 P = 11.225 +/- 0.0000010 years T = 1975 Jan. 5.61457 TT Epoch = 1974 Dec. 19.0 TT Peri. = 11.13937 e = 0.7792241 Node = 27.64007 (2000.0) a = 4.9531150 AU Inc. = 5.91702 n'= 0.08941007 q = 1.0935282 AU P = 11.023 years The predicted orbit for the 1997 return is as follows: T = 1997 Apr. 17.70269 TT Epoch = 1997 Apr. 22.0 TT Peri. = 22.32468 e = 0.7743646 Node = 14.41899 (2000.0) a = 5.1328807 AU Inc. = 4.87678 n'= 0.08475441 q = 1.1581595 AU P = 11.629 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 750205 385 0.2- 0.2- 750213 385 1.4+ 1.0+ 851006 372(11.8+ 6.6-) 750205 385 1.8+ 1.4+ 750215 385 1.1- 1.9- 851006 372 (2.6- 6.9-) 750208 380 0.1+ 0.3+ 750215 385 2.0+ 1.5+ 851011 474 (1.6- 3.2+) 750208 372 0.0 0.1- 750228 372 1.7- 0.1+ 851011 474 0.1- 1.9+ 750208 372 1.3- 2.7+ 750228 046 (5.7- 0.2-) 851015 323 0.8- 0.3+ 750208 801 (9.5- 3.5+) 750303 688 1.3- 1.6- 851016 474 2.1- 0.5- 750209 801 (3.0- 0.6-) 750303 372 (3.9- 0.1+) 851016 474 0.2- 0.3- 750209 385 0.9- 0.7- 750305 801 2.3- 0.2- 851108 474 0.3+ 1.0+ 750209 385 (3.0- 1.6-) 750307 691 (3.1- 1.3+) 851109 474 0.2- 1.7+ 750209 387 (1.6- 3.6+) 750307 691 2.6- 1.4+ 851109 474 0.0 1.2+ 750209 882 1.5+ 0.2- 750307 372 (4.7- 0.6-) 851117 707 0.1+ 0.3- 750209 380 0.0 0.6+ 750310 702 0.9+ 0.1+ 851202 323 0.2+ 0.9+ 750209 380 0.9- 1.3- 750314 702 1.9+ 2.7- 851211 657 2.4+ 0.8- 750210 385 (1.1+ 3.4+) 750314 693 1.7- 1.1+ 851212 657 0.4+ 1.7+ 750210 056 0.5+ 2.7+ 750314 693 1.2- 0.2+ 860103 984 (7.2- 5.5+) 750210 046 1.2- 0.1- 750316 372 (0.7- 3.2+) 860111 503 1.2+ 0.9- 750211 387 0.9+ 1.7+ 750330 993 (3.0- 3.2-) 860111 984 (3.9- 7.7-) 750211 385 0.8- 2.0- 750403 372 (3.8+ 0.1-) 860111 576 1.5+ 0.6- 750211 372 0.8- 0.3- 750409 693 2.0+ 0.3+ 860113 491 2.8- 2.3- 750211 372 2.5- 1.2- 750409 693 1.5+ 0.5+ 860114 491 0.5- 1.9- 750211 046 1.1- 1.1- 750429 801 1.4- 0.5+ 860115 984 (0.4- 5.1+) 750212 046 1.6+ 1.6- 750430 801 1.3- 1.4+ 860119 984 2.1+ 0.3+ 750213 385 2.6+ 1.3+ 750504 691 1.7+ 0.1- 860301 657 (5.7- 4.3-) 750213 385 1.7+ 1.4+ 750603 691 2.3+ 1.2+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1994 Apr. 23

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