OAA computing section circular NK 530 Periodic Comet Shoemaker-Holt (1987z)
The following improved orbital elements, by S. Nakano, are from 65 observations 1987 Sept. 24 to 1989 Feb. 6. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.19 arc seconds. Epoch = 1988 June 8.0 ET T = 1988 May 21.35882 +/- 0.00965 (m.e.) ET Peri. = 210.41333 +/- 0.00633 Node = 213.82635 +/- 0.00615 (1950.0) Inc. = 4.36750 +/- 0.00066 q = 3.0530214 +/- 0.0001763 AU e = 0.3219552 +/- 0.0000262 a = 4.5026842 +/- 0.0001931 AU n = 0.10315656 +/- 0.00000667 P = 9.554 +/- 0.0006141 years (+/- 0.22 day) The predicted orbit for the 1997 return is as follows: T = 1997 Nov. 21.16559 ET Epoch = 1997 Nov. 8.0 ET Peri. = 210.27206 e = 0.3213812 Node = 213.77496 (1950.0) a = 4.4900422 AU Inc. = 4.36666 n = 0.10359253 q = 3.0470270 AU P = 9.514 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 . , " " " 1987 09 24.38402 01 21 40.21 +10 36 05.1 0.2- 0.2+ 675/PL 1987 09 24.41563 01 21 39.23 +10 35 59.3 0.9- 1.4+ 675/PL 1987 10 02.96355 01 17 13.70 +10 01 15.4 2.3+ 0.7- 095/CR 1987 10 18.33524 01 08 07.99 +08 48 07.4 0.4- 1.8+ 675/PL 1987 10 19.48020 01 07 26.79 +08 42 26.3 0.0 2.1+ 675/PL 1987 10 20.28055 01 06 58.33 +08 38 27.8 1.7- 1.5+ 675/PL 1987 10 20.33444 01 06 56.33 +08 38 07.8 2.2- 1.5- 657/VC 1987 10 21.26326 01 06 23.56 +08 33 31.8 0.7- 1.4- 657/VC 1987 10 21.29521 01 06 22.47 +08 33 25.5 0.4+ 1.8+ 657/VC 1987 10 21.35399 01 06 20.14 +08 33 07.7 1.9- 0.6+ 675/PL 1987 10 21.67222 01 06 09.13 +08 31 32.4 1.6+ 0.2- 372/sk 1987 10 21.68403 01 06 08.88 +08 31 29.6 ( 4.3+ 0.5+) 372/sk 1987 10 22.14264 01 05 52.64 +08 29 12.8 0.5+ 0.2+ 801/HO 1987 10 22.25362 01 05 48.69 +08 28 39.9 1.5+ 0.2+ 801/HO 1987 10 23.20573 01 05 15.47 +08 23 58.4 0.9+ 0.1+ 801/HO 1987 10 23.72153 01 04 57.26 +08 21 25.9 2.6- 0.2- 399/ue 1987 10 23.73681 01 04 56.87 +08 21 22.1 0.4- 0.5+ 399/ue 1987 10 24.25281 01 04 39.21 +08 18 49.9 0.3+ 0.2- 801/HO 1987 10 26.33878 01 03 28.51 +08 08 42.9 0.0 0.2+ 691/ST 1987 10 26.35608 01 03 27.91 +08 08 37.7 0.0 0.0 691/ST - continued - P/Shoemaker-Holt NK 530 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s . , " " " 1987 10 26.36007 01 03 27.76 +08 08 36.5 0.2- 0.0 691/ST 1987 10 27.66181 01 02 44.68 +08 02 27.8 ( 1.0- 5.9+) 372/sk 1987 10 27.68368 01 02 43.98 +08 02 23.6 ( 0.4- 8.0+) 372/sk 1987 10 28.73889 01 02 09.89 +07 57 12.7 2.2+ 2.5- 372/sk 1987 10 28.75000 01 02 09.29 +07 57 09.1 ( 1.3- 2.9-) 372/sk 1987 11 14.77164 00 54 52.39 +06 47 17.3 1.2+ 1.0- 046/KL 1987 11 14.78414 00 54 52.03 +06 47 17.7 0.7- 1.9+ 046/KL 1987 11 15.79392 00 54 34.39 +06 43 58.4 1.1- 0.5+ 046/KL 1987 11 15.80538 00 54 34.19 +06 43 55.7 1.1- 0.0 046/KL 1987 11 16.20464 00 54 27.51 +06 42 39.8 0.6- 0.5- 691/ST 1987 11 16.21361 00 54 27.36 +06 42 38.7 0.5- 0.1+ 691/ST 1987 11 17.12774 00 54 12.69 +06 39 45.2 1.3- 2.2- 801/HO 1987 11 20.45556 00 53 27.58 +06 30 16.9 0.9+ 0.3+ 372/sk 1987 11 20.46997 00 53 27.44 +06 30 13.2 1.6+ 1.1- 372/sk 1987 11 22.45844 00 53 06.16 +06 25 12.7 0.8- 0.8+ 897/kj 1987 11 22.53072 00 53 05.42 +06 25 01.7 0.3- 0.3+ 897/kj 1987 11 23.22222 00 52 59.26 +06 23 23.1 0.1+ 0.8- 675/PL 1987 11 23.25000 00 52 59.04 +06 23 18.8 0.9+ 1.2- 675/PL 1987 11 24.23922 00 52 51.08 +06 21 06.3 0.1- 0.5- 691/ST 1987 11 24.25115 00 52 50.95 +06 21 05.2 0.5- 0.1- 691/ST 1987 11 24.42129 00 52 50.06 +06 20 44.8 2.2+ 1.9+ 897/kj 1987 11 24.46168 00 52 49.76 +06 20 40.7 ( 2.8+ 3.0+) 897/kj 1987 11 25.77720 00 52 41.34 +06 17 52.9 1.3+ 1.1- 046/KL 1987 11 25.79358 00 52 41.28 +06 17 52.9 2.0+ 0.8+ 046/KL 1987 12 19.02370 00 55 53.40 +06 07 48.8 ( 3.3- 1.7+) 801/HO 1987 12 21.83542 00 56 59.72 +06 11 21.7 2.0+ 0.8+ 026/BE 1987 12 23.12855 00 57 32.88 +06 13 19.4 0.6- 0.5- 691/ST 1987 12 23.15406 00 57 33.52 +06 13 21.7 0.7- 0.6- 691/ST 1987 12 24.00722 00 57 56.45 +06 14 46.2 2.5- 0.6- 801/HO 1988 01 20.42205 01 16 39.64 +07 41 56.0 0.4- 0.4- 381/ks 1988 01 20.51667 01 16 44.62 +07 42 21.9 0.3- 0.3+ 381/ks 1988 01 21.14394 01 17 18.31 +07 45 10.8 1.1+ 0.1+ 691/ST 1988 01 21.15243 01 17 18.74 +07 45 13.1 0.8+ 0.1+ 691/ST 1988 01 21.16385 01 17 19.36 +07 45 16.4 1.0+ 0.3+ 691/ST 1988 01 22.01181 01 18 05.16 +07 49 06.3 0.8- 0.6- 801/HO 1988 01 22.97754 01 18 57.99 +07 53 33.5 2.8- 0.7- 801/HO 1988 02 18.13975 01 46 55.90 +10 15 28.3 1.0+ 0.6- 675/PL 1988 02 19.13559 01 48 07.97 +10 21 29.2 0.6+ 0.6- 675/PL 1988 12 07.64653 07 50 10.07 +15 26 34.9 0.1- 0.5- 897/kj 1988 12 11.70243 07 48 42.80 +15 24 14.7 ( 3.9+ 0.6-) 877/OK 1988 12 11.76429 07 48 41.29 +15 24 16.1 ( 4.7+ 2.4+) 877/OK 1988 12 17.74850 07 45 57.72 +15 23 02.3 0.9- 1.0+ 897/kj 1988 12 17.79427 07 45 56.17 +15 23 03.5 2.4- 2.3+ 897/kj 1988 12 19.77604 07 44 54.37 +15 23 11.7 1.9+ 0.1+ 372/sk 1988 12 19.81215 07 44 53.13 +15 23 11.3 1.4+ 0.5- 372/sk 1989 01 06.55938 07 33 29.60 +15 35 46.1 1.4+ 0.6+ 897/kj 1989 01 06.59826 07 33 27.70 +15 35 47.0 1.4- 1.4- 897/kj 1989 01 28.52708 07 18 32.96 +16 09 35.3 1.6+ 2.8- 897/kj 1989 01 28.57280 07 18 30.99 +16 09 45.4 2.6- 2.5+ 897/kj 1989 02 01.55625 07 16 16.80 +16 16 44.5 ( 4.1+ 0.2+) 897/kj 1989 02 01.59514 07 16 15.48 +16 16 50.9 ( 3.8+ 2.5+) 897/kj 1989 02 02.54757 07 15 45.25 +16 18 29.6 1.2+ 0.0 887/nj 1989 02 02.55868 07 15 44.85 +16 18 31.1 0.6+ 0.3+ 887/nj 1989 02 02.57222 07 15 44.40 +16 18 32.0 0.4+ 0.2- 887/nj 1989 02 06.52535 07 13 48.70 +16 25 34.0 ( 3.7- 2.6+) 897/kj 1989 02 06.55532 07 13 48.05 +16 25 34.3 0.8- 0.3- 897/kj ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1989 May 5