OAA computing section circular NK 509 Periodic Comet Kowal 2 1979 II
The following improved orbital elements, by S. Nakano, are from 14 observations 1979 Jan. 27 to Mar. 23. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.02 arc seconds: Epoch = 1979 Jan. 7.0 ET T = 1979 Jan. 13.79132 +/- 0.03812 (m.e.) ET Peri. = 189.41498 +/- 0.02829 Node = 247.16486 +/- 0.02766 (1950.0) Inc. = 15.80473 +/- 0.00465 q = 1.5208411 +/- 0.0073836 AU e = 0.5636136 +/- 0.0014245 a = 3.4850793 +/- 0.0125242 AU n_ = 0.15149039 +/- 0.00081661 P = 6.506 +/- 0.0350710 years (+/-12.8 days) The predicted orbit for the 1991 return is as follows: T = 1991 Dec. 28.43109 ET Epoch = 1991 Dec. 10.0 ET Peri. = 189.64965 e = 0.5675946 Node = 247.01614 (1950.0) a = 3.4680186 AU Inc. = 15.83503 n_= 0.15260963 q = 1.4995900 AU P = 6.458 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 ! , " " " 1979 01 27.11250 02 58 20.22 +09 23 13.7 2.5+ 0.6- 675/PL 1979 01 28.12361 03 00 52.30 +09 21 34.9 1.2- 0.1- 675/PL 1979 01 29.27431 03 03 46.23 +09 19 55.2 0.1+ 0.5+ 675/PL 1979 02 01.48368 03 11 56.24 +09 16 28.0 2.2- 1.4+ 372/sk 1979 02 01.49757 03 11 58.45 +09 16 25.2 0.5- 0.6- 372/sk 1979 02 16.49306 03 51 07.69 +09 17 04.5 ( 4.4+ 3.4+) 372/sk 1979 02 16.54063 03 51 15.10 +09 17 10.4 2.2+ 0.5- 323/PR 1979 02 22.52917 04 07 10.47 +09 22 10.9 0.2+ 0.5+ 323/PR 1979 02 23.06650 04 08 36.46 +09 22 32.7 0.5- 0.1- 801/HO 1979 02 26.53715 04 17 52.86 +09 26 09.5 ( 3.6- 0.4-) 323/PR 1979 02 27.54687 04 20 35.1 +09 27 04 1.7- 1.2- 372/sk Y 1979 02 28.50278 04 23 08.97 +09 28 05.4 0.8+ 0.2+ 372/sk 1979 03 01.17118 04 24 56.45 +09 28 47.1 0.2+ 0.1- 675/PL 1979 03 18.51389 05 11 22.00 +09 43 39.3 ( 1.4- 5.7+) 323/PR 1979 03 21.48021 05 19 15.42 +09 44 37.2 0.7- 0.4- 372/sk 1979 03 21.49410 05 19 17.66 +09 44 37.6 0.0 0.2- 372/sk 1979 03 23.23264 05 23 54.43 +09 45 04.2 0.7+ 1.1+ 675/PL 1979 03 28.08417 05 36 43.12 +09 45 09.3 (10.4- 3.3+) 801/HO ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20