OAA computing section circular NK 533 Periodic Comet Ge-Wang
The following improved orbital elements, by S. Nakano, are from 13 observations 1988 Oct. 11 to Dec. 13. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.99 arc seconds. Epoch = 1988 June 8.0 ET T = 1988 May 23.83609 +/- 0.12559 (m.e.) ET Peri. = 176.09509 +/- 0.06150 Node = 179.84007 +/- 0.04965 (1950.0) Inc. = 11.67393 +/- 0.00293 q = 2.5173083 +/- 0.0019517 AU e = 0.5013193 +/- 0.0002984 a = 5.0479358 +/- 0.0024887 AU n = 0.08690271 +/- 0.00006427 P = 11.342 +/- 0.0083873 years (+/- 3.06 days) The predicted orbit for the 1999 return is as follows: T = 1999 June 26.85880 ET Epoch = 1999 July 1.0 ET Peri. = 177.34191 e = 0.5008778 Node = 176.44085 (1950.0) a = 4.9997907 AU Inc. = 12.18069 n = 0.08816096 q = 2.4955065 AU P = 11.180 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 . , " " " 1988 10 11.48385 03 03 42.04 +06 30 27.8 1.0- 0.1+ 675/PL 1988 10 11.51510 03 03 41.43 +06 30 13.3 1.2+ 0.6- 675/PL 1988 11 03.54097 02 51 28.68 +03 52 09.2 1.6- 0.1- 897/kj 1988 11 03.58056 02 51 27.22 +03 51 55.2 0.8- 0.0 897/kj 1988 11 04.36736 02 50 58.46 +03 47 17.7 1.9+ 0.7- 675/PL 1988 11 04.59666 02 50 50.19 +03 45 59.4 1.1+ 1.3+ 327/PK 1988 11 04.63797 02 50 48.50 +03 45 43.7 0.7- 0.1- 327/PK 1988 11 19.70527 02 42 09.18 +02 35 55.3 1.0+ 0.8+ 413/SS 1988 11 28.42118 02 38 15.46 +02 13 16.7 0.5- 0.3- 372/sk 1988 11 28.51563 02 38 13.15 +02 13 07.3 0.9- 0.4+ 372/sk 1988 11 30.54931 02 37 28.88 +02 09 53.5 1.0- 0.6+ 372/sk 1988 12 07.11356 02 35 36.50 +02 04 30.2 0.7- 1.8- 801/HO 1988 12 13.11101 02 34 37.53 +02 06 15.2 2.0+ 0.3+ 801/HO ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1989 May 15