Nakano Note (Nakano wa Kangaeru noda) NK 603 Periodic Comet Russell 4 (94P)

The following improved orbital elements, by S. Nakano, are from 44 observations 1984 to 1989. Perturbations by Mercury to Pluto and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga were taken into account. The mean residual is +/- 0.94 arc second. Epoch = 1990 July 8.0 TT T = 1990 July 6.82804 +/- 0.02675 (m.e.) TT Peri. = 93.04464 +/- 0.01119 Node = 71.03673 +/- 0.01049 (2000.0) Inc. = 6.19130 +/- 0.00247 q = 2.2222006 +/- 0.0000616 AU e = 0.3663153 +/- 0.0000173 a = 3.5067920 +/- 0.0000169 AU n' = 0.15008561 +/- 0.00000109 P = 6.567 +/- 0.0000476 years T = 1984 Jan. 5.96068 TT Epoch = 1984 Jan. 21.0 TT Peri. = 91.29159 e = 0.3832708 Node = 72.53575 (2000.0) a = 3.4449751 AU Inc. = 6.24776 n'= 0.15414340 q = 2.1246167 AU P = 6.394 years The predicted orbit for the 1997 return is as follows: T = 1997 Feb. 3.49799 TT Epoch = 1997 Feb. 1.0 TT Peri. = 93.27162 e = 0.3651005 Node = 70.96893 (2000.0) a = 3.5112113 AU Inc. = 6.18804 n'= 0.14980235 q = 2.2292663 AU P = 6.579 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 840302 413 0.1- 2.0+ 840327 552 (2.4- 1.8-) 840409 323 0.3- 1.1- 840304 413 2.1- 0.4- 840327 552 (4.3- 4.6-) 840419 657 (1.8+ 3.5-) 840307 413 0.5- 0.4+ 840328 381 0.2+ 1.6+ 840419 046 1.0- 1.2- 840310 675 0.6+ 0.1+ 840329 657 (6.6- 1.5+) 840419 046 0.8- 0.4- 840311 675 0.6+ 0.1- 840329 323 1.7+ 0.1+ 840421 675 0.3- 0.1+ 840311 675 0.8+ 0.3+ 840330 657 (3.2+ 2.6-) 840422 046 0.6- 1.6- 840311 675 0.9+ 0.1+ 840331 657 (5.4- 0.3-) 840424 046 (0.7+ 3.0-) 840311 372 1.9+ 0.6- 840331 056 (5.4- 3.9-) 840424 046 1.9+ 1.7+ 840312 801 (1.9+ 16.2+) 840401 056 0.9- 0.4- 840425 046 1.1+ 0.9+ 840312 801 (0.9+ 3.5+) 840402 657 (1.2+ 2.4+) 840425 046 0.7+ 1.9+ 840312 675 0.1- 1.1+ 840403 323 0.9- 0.5- 840426 323 0.9+ 0.4+ 840312 675 0.1- 0.9+ 840403 114 0.7+ 0.7+ 840429 801 (2.6+ 2.2+) 840321 675 0.2+ 1.6- 840404 801(10.1+ 8.1+) 840507 801 1.2- 0.8+ 840322 675 0.3- 1.6- 840404 688 1.3+ 1.1- 891211 675 0.2- 0.4- 840322 046 0.7- 0.5- 840404 688 1.1- 1.8- 891211 675 0.3- 0.1- 840323 046 0.8- 1.9+ 840404 114 (4.1+ 0.6-) 891211 675 0.0 0.3- 840326 372 (5.8- 8.8+) 840405 707 0.8+ 0.4- 891211 675 0.3- 0.4- 840326 323 (3.6- 6.2+) 840405 323 0.1- 0.1+ 891212 675 0.0 0.4+ 840326 552 (1.4+ 6.5-) 840405 046 (0.4- 3.7-) 891212 675 0.0 0.2+ 840326 552 (2.6+ 2.1-) 840405 046 1.4- 1.9- 891212 675 0.2+ 0.1+ 840327 801 0.5- 1.6+ 840408 675 0.5- 0.8- 891212 675 0.7+ 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1994 Apr. 21

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