OAA computing section circular NK 479 Periodic Comet Du Toit-Hartley 1982 II = 1982c
The following improved orbital elements for principal component (1982c), by S. Nakano, are from 21 observations 1982 Feb. 5 to June 23: Perturbations by all nine planets were taken into account. The mean residual is +/- 0.97 arc second. Epoch = 1982 Mar. 12.0 ET T = 1982 Mar. 30.44269 +/- 0.00041 (m.e.) ET Peri. = 251.66693 +/- 0.00242 Node = 308.59209 +/- 0.00241 (1950.0) Inc. = 2.93971 +/- 0.00017 q = 1.1947622 +/- 0.0002118 AU e = 0.6023731 +/- 0.0000479 a = 3.0047316 +/- 0.0003905 AU nß = 0.18923242 +/- 0.00000064 P = 5.208 +/- 0.0010152 years (+/- 0.37 day) The predicted orbit for the 1987 return is as follows: T = 1987 June 14.31818 ET Epoch = 1987 June 14.0 ET Peri. = 251.65369 e = 0.6012773 Node = 308.55738 (1950.0) a = 3.0072786 AU Inc. = 2.93807 nß= 0.18899206 q = 1.1990702 AU P = 5.215 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 ¡ , " " " 1982 02 05.73327 12 31 58.81 -07 04 10.1 2.2- 0.9- 413/SS 1982 02 06.75184 12 34 51.53 -07 31 24.4 ( 0.0 3.7-) 413/SS 1982 02 07.75149 12 37 42.97 -07 58 15.8 ( 2.5- 7.1+) 413/SS 1982 02 16.68478 13 04 58.40 -12 14 40.8 ( 1.7- 3.9+) 413/SS 1982 02 17.71875 13 08 20.28 -12 46 21.2 1.9- 0.4- 372/sk 1982 02 18.44688 13 10 43.86 -13 08 33.9 1.5+ 0.8- 707/ev 1982 02 19.52813 13 14 21.07 -13 41 10.7 ( 4.4+ 4.2+) 474/JN 1982 02 19.55718 13 14 26.75 -13 42 06.4 ( 3.9+ 2.7+) 474/JN 1982 02 19.68588 13 14 52.06 -13 46 10.5 0.0 1.7+ 413/SS 1982 02 19.70741 13 14 56.18 -13 46 52.0 0.9- 0.2+ 413/SS 1982 02 20.44861 13 17 25.67 -14 10 12.4 (10.5- 1.9-) 688/LO 1982 02 20.48194 13 17 31.78 -14 11 05.0 (16.8- 7.5+) 688/LO 1982 02 20.67989 13 18 13.55 -14 16 51.3 ( 0.8+ 3.1+) 474/JN 1982 02 22.67419 13 25 06.51 -15 19 17.4 0.1+ 1.5- 474/JN 1982 02 22.68750 13 25 09.25 -15 19 41.9 0.7+ 1.0- 474/JN 1982 02 24.41597 13 31 16.31 -16 14 47.4 0.8+ 0.9- 707/ev 1982 02 24.46007 13 31 25.39 -16 16 11.2 0.1+ 0.8- 707/ev 1982 02 25.78507 13 36 12.3 -16 58 14 ( 1.0- 3.5+) 372/sk Y 1982 02 28.45764 13 46 06.43 -18 23 45.0 ( 3.7+ 1.5-) 675/PL 1982 02 28.49236 13 46 13.78 -18 24 47.3 ( 1.1+ 2.8+) 675/PL - continued - NK 479 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1982 03 21.51042 15 13 39.22 -28 44 31.0 0.5- 0.9+ 474/JN 1982 03 21.52465 15 13 42.99 -28 44 52.9 1.1+ 0.4+ 474/JN 1982 03 27.58866 15 39 55.91 -30 57 07.4 1.0- 1.4+ 474/JN 1982 03 27.59641 15 39 57.88 -30 57 16.8 0.2- 1.2+ 474/JN 1982 04 22.41736 17 07 55.38 -34 54 42.7 0.4- 0.0 707/ev 1982 04 23.69558 17 10 41.28 -34 54 52.6 0.2+ 0.6+ 474/JN 1982 04 23.71271 17 10 43.33 -34 54 52.2 0.9+ 0.9+ 474/JN 1982 05 25.204 17 32 34.52 -32 34 28.5 0.7+ 2.5- 809/ES 1982 05 26.230 17 32 11.75 -32 26 40.8 ( 2.4+ 5.2-) 809/ES 1982 05 26.289 17 32 09.89 -32 26 12.8 ( 3.6+ 4.7-) 809/ES 1982 05 28.61795 17 31 11.02 -32 07 48.5 0.0 0.6- 474/JN 1982 05 28.63959 17 31 10.30 -32 07 37.5 0.3+ 0.3- 474/JN 1982 06 23.46492 17 18 58.42 -28 38 01.9 0.4- 0.4- 474/JN 1982 06 23.48645 17 18 57.92 -28 37 51.9 0.7- 0.1+ 474/JN ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1985 July 11