OAA computing section circular NK 473 Periodic Comet Jackson-Neujmin 1970 IX = 1978 XXVI
The following improved orbital elements, by S. Nakano, are from 14 observations 1970 to 1978: Perturbations by all nine planets were taken into account. The mean residual is +/- 2.26 arc seconds. Epoch = 1979 Jan. 7.0 ET T = 1978 Dec. 26.20192 +/- 0.00705 (m.e.) ET Peri. = 196.27968 +/- 0.00268 Node = 163.12938 +/- 0.00193 (1950.0) Inc. = 14.07109 +/- 0.00043 q = 1.4250601 +/- 0.0000580 AU e = 0.6545041 +/- 0.0000140 a = 4.1246795 +/- 0.0000100 AU nß = 0.11765727 +/- 0.000000007 P = 8.377 +/- 0.0000304 years (+/- 0.01 day) T = 1970 Aug. 6.44509 ET Epoch = 1970 Aug. 2.0 ET Peri. = 196.23304 e = 0.6542753 Node = 163.22140 (1950.0) a = 4.1288060 AU Inc. = 14.06686 nß= 0.11748092 q = 1.4274304 AU P = 8.390 years The predicted orbit for the 1987 return is as follows: T = 1987 May 24.50190 ET Epoch = 1987 May 5.0 ET Peri. = 196.59625 e = 0.6526165 Node = 163.12377 (1950.0) a = 4.1377385 AU Inc. = 14.06376 nß= 0.11710071 q = 1.4373822 AU P = 8.417 years The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1970 09 23.77882 04 52 31.19 +03 51 46.3 ( 3.0+ 20.1-) 370/sk 1970 09 26.78038 04 56 46.90 +03 12 39.3 2.0- 0.2- 370/sk 1970 09 26.79774 04 56 48.43 +03 12 26.8 0.8+ 1.1+ 370/sk 1970 09 29.14850 04 59 50.60 +02 41 11.3 3.3+ 0.8- 046/KL 1970 09 30.04889 05 00 55.35 +02 29 01.6 (10.4- 11.1-) 046/KL 1970 09 30.06972 05 00 57.60 +02 28 56.2 1.8+ 0.2+ 046/KL 1970 10 01.38750 05 02 28.86 +02 11 23.9 0.9- 0.0 693/CT 1970 10 01.41250 05 02 30.48 +02 11 04.3 0.7- 0.4+ 693/CT 1970 10 05.38785 05 06 34.10 +01 18 06.0 0.8- 0.2+ 691/ST 1970 10 05.39767 05 06 34.59 +01 17 58.3 1.2- 0.3+ 691/ST 1970 10 31.38821 05 13 47.45 -03 48 11.7 1.2- 1.2+ 693/CT 1970 10 31.43404 05 13 46.36 -03 48 36.7 1.4- 1.3+ 693/CT 1970 11 25.28588 04 56 07.38 -05 43 30.9 1.2+ 1.7- 691/ST 1970 11 25.32963 04 56 04.79 -05 43 29.9 1.0+ 1.6- 691/ST 1978 11 28.12014 20 23 25.4 -18 26 54 1.4- 8.1- 675/PL Y 1978 11 29.11597 20 26 36.48 -18 24 54.4 1.2+ 5.9+ 675/PL ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1985 July 7