OAA computing section circular NK 1055 D/1918 W1 (Schorr)
The following improved orbital elements, by S. Nakano, are from 19 observations 1918 Nov. 23 to Dec. 31. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.54 arc seconds. Epoch = 1918 Oct. 14.0 TT T = 1918 Sept.30.13598 +/- 0.19329 (m.e.) TT Peri. = 279.22412 +/- 0.09662 Node = 118.96527 +/- 0.01646 (2000.0) Inc. = 5.57348 +/- 0.00232 q = 1.8832617 +/- 0.0004893 AU e = 0.4686158 +/- 0.0003744 a = 3.5440676 +/- 0.0007509 AU n' = 0.14772401 +/- 0.00004695 P = 6.672 +/- 0.0021205 years (+/- 0.77 day) The predicted orbit for the 2007 return is as follows: T = 2007 Sept.26.36169 TT Epoch = 2007 Sept.17.0 TT Peri. = 326.34266 e = 0.3153242 Node = 76.04018 (2000.0) a = 4.1689163 AU Inc. = 6.79806 n'= 0.11578953 q = 2.8543563 AU P = 8.512 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1918/ 181130 024 1.2- 2.1+ 181206 754 0.5+ 1.7- 181123 029 0.5- 0.4- 181201 754 1.8+ 0.1- 181208 754 0.3- 1.9- 181123 029 3.1+ 0.3+ 181201 786 1.8+ 0.4- 181208 754 (5.7- 2.4-) 181124 029 1.5- 2.0- 181201 754(10.1+ 0.0 ) 181210 029 1.2- 2.2+ 181125 029 2.1- 1.5+ 181201 754 0.0 1.1- 181224 029 (0.2- 8.7+) 181129 029 1.8- 0.3- 181203 786 0.3+ 1.0- 181226 029 0.4+ 2.0- 181130 786 3.0+ 0.1+ 181204 754 2.0+ 0.7+ 181231 029 0.1- 1.3+ 181130 024 3.6- 1.2+ 181206 754 0.6- 1.6+ ( ) -------- Rejected Obs.
Director, Computing Section Late edition Syuichi Nakano 2001 May 20