OAA computing section circular NK 493 Periodic Comet Longmore 1974 XIV = 1981 XVI
The following improved orbital elements, by S. Nakano, are from 16 observations 1975 to 1982. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.90 arc second: Epoch = 1981 Oct. 3.0 ET T = 1981 Oct. 21.76751 +/- 0.00458 (m.e.) ET Peri. = 195.91159 +/- 0.00151 Node = 15.01209 +/- 0.00147 (1950.0) Inc. = 24.41273 +/- 0.00038 q = 2.3995397 +/- 0.0000019 AU e = 0.3430585 +/- 0.0000005 a = 3.6525927 +/- 0.0000006 AU n_ = 0.14118944 +/- 0.00000004 P = 6.981 +/- 0.0000019 years T = 1974 Nov. 4.43087 ET Epoch = 1974 Nov. 9.0 ET Peri. = 196.27501 e = 0.3425473 Node = 15.00862 (1950.0) a = 3.6532166 AU Inc. = 24.40134 n_= 0.14115327 q = 2.4018171 AU P = 6.983 years The predicted orbit for the 1988 return is as follows: T = 1988 Oct. 12.18795 ET Epoch = 1988 Oct. 6.0 ET Peri. = 195.69584 e = 0.3414199 Node = 15.00241 (1950.0) a = 3.6576818 AU Inc. = 24.38642 n_= 0.14089488 q = 2.4088763 AU P = 6.995 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 ! , " " " 1975 06 10.6496 18 54 03.31 -58 42 17.9 0.5+ 0.2+ 413/SS 1975 06 11.5831 18 53 00.43 -58 48 16.6 0.3- 0.5+ 413/SS 1975 07 09.5565 18 15 50.37 -59 35 54.4 0.3+ 0.1- 413/SS 1975 08 06.4627 17 54 26.42 -56 43 11.4 0.2- 0.9- 413/SS 1975 08 11.09354 17 53 51.75 -56 03 29.8 0.7+ 0.4- 809/ES 1975 08 11.20573 17 53 51.27 -56 02 30.4 0.4+ 0.8- 809/ES 1975 10 04.07712 18 34 15.87 -48 06 59.7 1.3- 0.5- 807/CE 1975 10 04.13007 18 34 19.92 -48 06 32.5 1.3- 0.4- 807/CE 1981 01 02.79757 11 05 15.13 +36 04 06.8 0.0 1.0- 372/sk 1981 01 03.78333 11 05 18.72 +36 08 45.0 0.8- 0.0 372/sk 1981 01 03.80799 11 05 18.80 +36 08 50.2 0.2- 1.8- 372/sk 1981 01 08.76749 11 05 10.65 +36 33 12.9 1.6- 1.0+ 381/ks 1981 02 06.32296 10 49 49.35 +38 52 08.9 0.9- 0.2- 801/HO 1981 06 06.09318 10 20 49.29 +20 39 30.5 2.8+ 1.0+ 801/HO 1982 07 26.48601 18 26 25.58 -58 16 03.4 0.2- 0.2+ 474/JN 1982 07 26.51506 18 26 24.08 -58 15 53.0 0.4+ 0.5- 474/JN ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1986 December 23