OAA computing section circular NK 464 Comet IRAS 1983o

The following improved orbital elements, by S. Nakano, are from 22 observations 1983 August 4 to 1984 June 5. Pertur- bations by Mercury to Pluto were taken into account. The mean residuals is +/- 1.15 arc seconds: Epoch = 1983 Dec. 12.0 ET T = 1983 Nov. 28.00064 +/- 0.00188 (m.e.) ET Peri. = 333.98189 +/- 0.00066 Node = 200.56057 +/- 0.00022 1950.0 Inc. = 120.74303 +/- 0.00027 q = 2.2547765 +/- 0.0000116 AU e = 1.0001957 +/- 0.0000240 1/a = -0.0000868 +/- 0.0000106 1/AU The extension orbit is from the above orbital elements: Epoch = 1985 May 15.0 ET T = 1983 Nov. 28.03471 Peri. = 334.00371 e = 1.0002069 Node = 200.57723 1950.0 q = 2.2550428 AU Inc. = 120.74901 m1 = 9.8 (k=10) m2 = 11.3 (k=5) The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1983 Aug. 4.42645 11 25 35.18 -63 17 07.6 0.5- 1.0+ 413/SS Sept.11.35012 12 51 32.09 -47 14 13.1 1.5- 1.4+ 474/JN 11.38067 12 51 35.17 -47 13 38.3 0.8- 0.1+ 474/JN 16.34709 12 59 29.70 -45 40 25.5 1.8+ 0.6- 474/JN 16.36943 12 59 31.72 -45 40 02.0 1.1+ 1.5- 474/JN 1984 Jan. 2.60414 14 48 10.84 -24 53 36.4 0.6+ 0.0 474/JN 2.62521 14 48 11.45 -24 53 21.0 2.0+ 0.9- 474/JN 28.62892 14 51 16.20 -17 44 43.6 0.5- 0.1+ 474/JN 28.63841 14 51 16.11 -17 44 31.9 0.1+ 0.2- 474/JN Feb. 1.81111 14 50 05.17 -16 12 36.9 1.0- 0.0 323/PR - continued - Comet IRAS (1983o) NK 464-2 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1984 Feb. 9.69722 14 46 14.15 -12 54 42.8 ( 1.1+ 3.7+) 323/PR Mar. 1.42929 14 24 05.24 - 1 16 12.6 0.2+ 0.3- 801/HO 2 1.71701 14 23 38.95 - 1 04 31.4 0.7+ 0.3+ 323/PR 3.50348 14 20 48.20 + 0 08 12.4 ( 0.0 4.1-) 657/VC 12.74722 14 03 46.12 + 6 48 25.2 ( 3.2- 1.7+) 323/PR 21.95333 13 43 21.87 +13 41 56.9 ( 3.4- 1.6+) 046/KL 21.96074 13 43 21.28 +13 42 12.9 ( 3.5+ 2.2-) 046/KL 22.94375 13 41 00.55 +14 25 46.6 0.3- 1.6+ 567/CI 4 22.95417 13 40 58.67 +14 26 16.8 ( 5.6- 4.2+) 567/CI 4 23.01925 13 40 49.45 +14 29 07.0 2.1- 2.4+ 046/KL 23.02654 13 40 48.57 +14 29 19.5 ( 0.5+ 4.4-) 046/KL 28.69874 13 26 51.22 +18 32 26.6 0.6- 1.3- 381/ks 30.35788 13 22 40.39 +19 40 07.7 ( 0.8- 5.9-) 657/VC Apr. 2.35103 13 15 04.73 +21 37 32.3 ( 5.9+ 9.7-) 657/VC 5 4.29306 13 10 07.75 +22 50 07.3 ( 2.0+ 9.2-) 688/LO 6 4.31875 13 10 03.86 +22 51 07.6 ( 3.2+ 5.3-) 688/LO 6 5.99152 13 05 48.60 +23 51 07.0 1.3+ 2.9- 046/KL 5.99869 13 05 47.03 +23 51 30.0 ( 5.2- 5.0+) 046/KL 26.26282 12 18 50.38 +32 40 21.3 2.5+ 0.0 657/VC 29.17028 12 13 15.14 +33 28 13.1 0.1+ 0.3- 801/HO May 7.08323 11 59 56.47 +35 10 16.7 1.3- 1.7+ 801/HO 28.08160 11 37 41.49 +37 20 53.2 0.1- 0.7- 801/HO 5 June 1.55578 11 35 07.41 +37 31 54.8 0.7- 0.9- 381/ks 5.12634 11 33 32.66 +37 38 03.0 0.0 1.0+ 801/HO 6 ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1984 December 2

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