OAA computing section circular NK 498 Periodic Comet Urata-Niijima (1986o) = 1986 TD4 = 1986 WP5

The following improved orbital elements, by S. Nakano, are from 71 observations 1986 Oct. 4 to 1987 Mar. 27. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.95 arc second. The identifications with minor planets 1986 TD4 and 1986 WP5 are by S. Nakano (MPC 12025): Epoch = 1986 Nov. 26.0 ET T = 1986 Nov. 22.94021 +/- 0.00054 (m.e.) ET Peri. = 21.38485 +/- 0.00051 Node = 31.28372 +/- 0.00048 (1950.0) Inc. = 24.25094 +/- 0.00022 q = 1.4491978 +/- 0.0000465 AU e = 0.5891009 +/- 0.0000088 a = 3.5268943 +/- 0.0000844 AU n_ = 0.14880428 +/- 0.00000534 P = 6.624 +/- 0.0002377 years (+/- 0.087 day) The predicted orbit for the 1993 return is as follows: T = 1993 July 13.33427 ET Epoch = 1993 Aug. 1.0 ET Peri. = 21.47180 e = 0.5878414 Node = 31.22300 (1950.0) a = 3.5341514 AU Inc. = 24.20872 n_= 0.14834617 q = 1.4566308 AU P = 6.644 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 ! , " " " 1986 10 04.38889 02 34 49.90 +01 12 32.1 ( 3.4- 4.2+) 675/PL 1986 10 04.43750 02 34 47.94 +01 13 56.8 1.5- 0.9- 675/PL 1986 10 29.93343 02 01 38.08 +18 22 19.7 0.0 0.7+ 054/CB 1986 10 30.57911 02 00 27.12 +18 52 18.5 1.4- 0.0 887/nj 1986 10 30.60341 02 00 24.29 +18 53 27.5 1.3- 1.5+ 887/nj 1986 10 30.61875 02 00 22.30 +18 54 12.5 ( 4.2- 3.9+) 887/nj 1986 11 02.54340 01 54 57.47 +21 09 06.0 0.3- 2.6- 881/sz 1986 11 02.56701 01 54 54.78 +21 10 13.2 1.3+ 0.6- 881/sz 1986 11 03.66354 01 52 51.27 +22 00 26.9 ( 3.9+ 1.4+) 372/sk 1986 11 03.67465 01 52 49.93 +22 00 59.2 ( 3.6+ 3.5+) 372/sk 1986 11 04.02847 01 52 09.75 +22 16 53.3 ( 1.7- 4.9-) 561/PI 1986 11 04.04097 01 52 08.18 +22 17 29.4 ( 3.3- 2.6-) 561/PI 1986 11 04.47176 01 51 21.54 +22 37 12.4 1.6+ 1.4+ 373/ts 1986 11 04.48669 01 51 19.79 +22 37 52.9 1.7+ 0.9+ 373/ts 1986 11 04.59957 01 51 06.06 +22 43 18.4 1.1+ 0.3+ 413/SS 1986 11 04.60490 01 51 05.27 +22 43 33.5 1.1- 1.0+ 413/SS 1986 11 04.60971 01 51 04.72 +22 43 46.9 0.8- 1.4+ 413/SS 1986 11 04.65000 01 51 00.03 +22 45 24.0 ( 3.5- 7.0+) 372/sk 1986 11 04.70069 01 50 54.43 +22 47 37.0 ( 1.9+ 3.3+) 372/sk 1986 11 05.51481 01 49 23.93 +23 24 37.8 0.5- 0.2- 413/SS - continued - P/Urata-Niijima NK 498 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1986 11 05.52021 01 49 23.30 +23 24 52.2 0.3- 0.4- 413/SS 1986 11 05.55104 01 49 19.76 +23 25 58.4 1.7- 1.2+ 881/sz 1986 11 05.87639 01 48 43.95 +23 40 31.0 ( 3.5+ 0.3+) 010/IC 1986 11 05.89722 01 48 41.88 +23 41 23.9 ( 8.7+ 3.1-) 010/IC 1986 11 06.20738 01 48 06.78 +23 55 22.6 0.2+ 0.4+ 688/LO 1986 11 06.26887 01 47 59.73 +23 58 04.9 ( 3.3+ 2.5-) 688/LO 1986 11 06.30146 01 47 55.72 +23 59 25.7 ( 2.0- 4.9-) 657/VC 1986 11 06.33236 01 47 52.13 +24 00 52.9 1.7- 0.3- 657/VC 1986 11 06.53333 01 47 30.25 +24 09 53.3 1.0+ 0.7+ 399/ue 1986 11 06.61528 01 47 20.55 +24 13 31.6 0.6- 1.0- 391/ko 1986 11 06.63194 01 47 18.79 +24 14 08.4 ( 2.0+ 8.4-) 391/ko 1986 11 06.66736 01 47 14.99 +24 16 09.0 1.5+ 2.3- 323/PR 1986 11 07.21672 01 46 14.50 +24 40 14.9 0.3+ 0.6- 691/ST 1986 11 07.22031 01 46 14.00 +24 40 25.5 0.7- 0.5+ 691/ST 1986 11 07.24319 01 46 11.39 +24 41 25.6 0.4+ 0.3- 691/ST 1986 11 07.24634 01 46 11.04 +24 41 33.6 0.7+ 0.6- 691/ST 1986 11 07.60347 01 45 31.34 +24 57 17.6 1.7+ 1.2- 372/sk 1986 11 08.59375 01 43 42.24 +25 40 37.4 1.2- 0.5+ 391/ko 1986 11 08.59722 01 43 42.17 +25 40 42.7 ( 3.3+ 3.2-) 391/ko 1986 11 08.89951 01 43 08.70 +25 53 51.9 ( 6.3- 1.5+) 561/PI 1986 11 10.00521 01 41 09.20 +26 41 20.6 2.3+ 0.1+ 561/PI 1986 11 11.70801 01 38 08.45 +27 53 04.0 0.2+ 0.1+ 892/YM 1986 11 11.72465 01 38 06.65 +27 53 43.0 0.1+ 1.7- 892/YM 1986 11 25.42639 01 18 48.74 +36 10 17.9 2.6+ 1.6- 372/sk 1986 11 25.44861 01 18 46.99 +36 11 00.3 0.9- 0.6- 372/sk 1986 11 26.50148 01 17 46.08 +36 42 56.6 1.7- 1.2+ 887/nj 1986 11 26.50764 01 17 45.82 +36 43 08.3 0.3- 1.8+ 887/nj 1986 11 26.53924 01 17 43.86 +36 44 03.2 0.8- 0.1+ 881/sz 1986 11 26.56979 01 17 42.05 +36 44 58.0 0.1- 0.7+ 881/sz 1986 11 26.57431 01 17 41.73 +36 45 02.7 0.1- 0.0 399/ue 1986 11 27.86319 01 16 35.55 +37 22 49.6 ( 1.5+ 4.5-) 010/IC 1986 11 27.89097 01 16 33.97 +37 23 38.3 ( 0.8+ 3.7-) 010/IC 1986 11 28.73520 01 15 55.12 +37 47 45.5 1.2+ 0.2+ 046/KL 1986 11 28.74932 01 15 54.41 +37 48 05.5 ( 1.2+ 4.0-) 046/KL 1986 11 28.78273 01 15 52.75 +37 49 05.8 1.1- 0.9+ 494/mn 1986 11 28.83293 01 15 50.32 +37 50 30.5 0.5- 0.0 494/mn 1986 11 28.85774 01 15 49.16 +37 51 13.0 0.3+ 0.5+ 494/mn 1986 11 30.33160 01 14 47.73 +38 31 53.3 0.4+ 0.3+ 707/ev 1986 11 30.34792 01 14 47.04 +38 32 18.9 0.0 0.1+ 707/ev 1986 12 01.09876 01 14 20.89 +38 52 30.7 0.4- 0.3+ 801/HO 1986 12 01.26807 01 14 14.78 +38 57 00.0 0.7- 1.0- 691/ST 1986 12 01.27888 01 14 14.39 +38 57 16.8 0.4- 1.0- 691/ST 1986 12 01.29154 01 14 13.90 +38 57 36.9 0.4- 0.5- 691/ST 1986 12 02.07049 01 13 50.30 +39 17 59.0 0.5- 0.2- 801/HO 1986 12 04.30882 01 12 56.07 +40 14 18.6 0.7+ 0.1+ 691/ST 1986 12 06.53738 01 12 27.35 +41 07 20.1 1.4+ 2.0+ 399/ue 1986 12 06.56191 01 12 27.02 +41 07 52.8 1.1+ 1.3+ 399/ue 1986 12 07.50486 01 12 22.31 +41 29 29.4 0.4- 1.5+ 881/sz 1986 12 20.40983 01 18 20.37 +45 40 44.2 0.4+ 1.7- 887/nj 1986 12 20.43403 01 18 21.50 +45 41 10.6 0.7- 0.4+ 887/nj - continued - P/Urata-Niijima NK 498 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1986 12 28.23228 01 27 59.90 +47 41 15.4 0.4- 0.5+ 801/HO 1986 12 29.23124 01 29 32.60 +47 55 19.4 0.2- 1.2- 691/ST 1986 12 29.24402 01 29 33.78 +47 55 29.7 0.0 1.1- 691/ST 1986 12 29.24821 01 29 34.15 +47 55 33.1 0.1- 1.0- 691/ST 1986 12 30.19051 01 31 05.45 +48 08 30.7 0.1- 0.9- 691/ST 1986 12 30.19966 01 31 06.32 +48 08 38.2 0.1+ 0.7- 691/ST 1986 12 30.20631 01 31 06.93 +48 08 44.6 0.1- 0.5+ 691/ST 1987 01 01.38715 01 34 51.89 +48 37 41.1 0.4- 0.4- 887/nj 1987 01 01.39826 01 34 52.98 +48 37 50.1 0.8- 0.1- 887/nj 1987 01 25.21964 02 33 16.14 +52 31 33.0 0.2+ 0.5- 691/ST 1987 01 25.23366 02 33 18.61 +52 31 38.1 0.0 0.6- 691/ST 1987 01 25.23942 02 33 19.68 +52 31 40.0 0.4+ 0.8- 691/ST 1987 01 27.13919 02 39 07.56 +52 43 43.2 0.0 0.9+ 801/HO 1987 01 29.15786 02 45 25.80 +52 55 23.9 0.5- 0.3+ 801/HO 1987 03 02.15359 04 36 49.36 +53 23 33.6 0.2- 0.0 691/ST 1987 03 02.16715 04 36 52.34 +53 23 30.2 0.7+ 0.2- 691/ST 1987 03 02.17301 04 36 53.55 +53 23 30.1 0.4+ 1.2+ 691/ST 1987 03 27.14038 06 02 45.77 +50 36 59.3 ( 4.5- 0.2-) 691/ST 1987 03 27.15929 06 02 50.05 +50 36 49.8 1.8+ 1.0+ 691/ST 1987 03 27.17057 06 02 51.87 +50 36 41.8 1.5- 0.6- 691/ST ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1987 August 20

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