OAA computing section circular NK 561 Periodic Comet Mrkos (1991k)
The following improved orbital elements, by S. Nakano, are from 50 observations 1991 Mar. 15 to July 10. Perturbations by all nine planets and five minor planets were taken into account. The mean residual is +/- 0.96 arc second. Epoch = 1991 Mar. 5.0 TT T = 1991 Mar. 18.97060 +/- 0.00089 (m.e.) TT Peri. = 180.41065 +/- 0.00086 Node = 1.68754 +/- 0.00083 (2000.0) Inc. = 31.48682 +/- 0.00042 q = 1.4104524 +/- 0.0000939 AU e = 0.5547541 +/- 0.0000200 a = 3.1678053 +/- 0.0001555 AU nß = 0.17481003 +/- 0.00001287 P = 5.638 +/- 0.0004152 years (+/- 0.15 day) The predicted orbit for the 1996 return is as follows: T = 1996 Nov. 8.97645 TT Epoch = 1996 Nov. 13.0 TT Peri. = 180.52271 e = 0.5542363 Node = 1.65272 (2000.0) a = 3.1695999 AU Inc. = 31.47030 nß= 0.17466159 q = 1.4128926 AU P = 5.643 years The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs h m s ¡ , " " " 1991 03 15.60486 12 50 36.53 -01 36 23.1 0.0 0.4- 400/KM 1991 03 15.61528 12 50 35.14 -01 36 57.7 ( 4.2+ 5.0+) 400/KM 1991 03 15.62222 12 50 34.03 -01 37 30.2 ( 4.2+ 0.9-) 400/KM 1991 03 15.63264 12 50 32.31 -01 38 07.0 ( 3.5+ 2.3+) 400/KM 1991 03 16.73542 12 47 38.65 -02 49 06.9 0.8+ 2.4- 896/AV 1991 03 16.95628 12 47 03.80 -03 03 30.0 ( 5.6- 3.8-) 046/KL 1991 03 16.97017 12 47 01.58 -03 04 23.0 ( 4.4- 2.8-) 046/KL 1991 03 17.03753 12 46 50.58 -03 08 42.3 2.1- 0.1+ 046/KL 1991 03 17.04517 12 46 49.25 -03 09 14.6 ( 3.1- 2.5-) 046/KL 1991 03 17.60104 12 45 20.49 -03 45 22.3 ( 0.1- 4.2-) 896/AV 1991 03 17.98406 12 44 17.68 -04 10 22.8 2.1- 1.2- 046/KL 1991 03 17.99170 12 44 16.37 -04 10 52.8 2.3- 1.2- 046/KL 1991 03 18.02642 12 44 10.63 -04 13 03.3 ( 0.2- 4.5+) 046/KL 1991 03 18.03406 12 44 09.27 -04 13 32.4 ( 1.2- 5.4+) 046/KL 1991 03 18.24219 12 43 36.55 -04 27 10.1 ( 5.3+ 0.6+) 675/PL 1991 03 18.27500 12 43 30.81 -04 29 20.0 ( 3.0+ 0.2-) 675/PL 1991 03 18.54028 12 42 46.63 -04 46 19.6 ( 2.8- 1.6+) 413/SS 1991 03 18.62014 12 42 33.77 -04 51 33.2 1.7+ 2.1+ 323/PR 1991 03 18.88368 12 41 48.66 -05 08 40.5 ( 7.4+ 12.9+) 323/PR 1991 03 19.55400 12 39 56.81 -05 52 59.1 0.5- 1.2- 474/JN - continued - P/Mrkos NK 561 - 2 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1991 03 19.56350 12 39 55.15 -05 53 36.2 0.4- 0.7- 474/JN 1991 03 19.63138 12 39 43.30 -05 58 04.4 0.0 0.5- 474/JN 1991 03 19.63444 12 39 42.77 -05 58 16.7 0.1+ 0.7- 474/JN 1991 03 19.67951 12 39 35.86 -06 01 18.0 0.4+ 0.1+ 323/PR 1991 03 19.70041 12 39 31.34 -06 02 39.0 2.1- 1.8+ 413/SS 1991 03 20.52049 12 37 13.08 -06 56 49.0 1.0+ 0.4+ 413/SS 1991 03 20.63646 12 36 52.62 -07 04 51.0 0.6+ 0.6+ 372/sk 1991 03 20.75556 12 36 31.24 -07 12 43.3 0.2- 0.3+ 372/sk 1991 03 20.78472 12 36 25.86 -07 14 16.1 0.1+ 0.3+ 413/SS 1991 03 21.18954 12 35 17.19 -07 41 26.5 0.0 1.2+ 801/HO 1991 03 21.19256 12 35 16.64 -07 41 39.0 0.1- 0.7+ 801/HO 1991 03 21.26569 12 35 04.42 -07 46 30.6 1.6+ 0.1+ 657/VC 1991 03 21.30528 12 34 57.16 -07 49 16.4 ( 1.2- 8.4-) 657/VC 1991 03 21.43669 12 34 35.15 -07 57 22.7 0.6+ 0.2- 413/SS 1991 03 21.51002 12 34 21.54 -08 02 09.4 0.0 1.2+ 474/JN 1991 03 21.51963 12 34 19.86 -08 02 47.7 0.8+ 1.0+ 474/JN 1991 03 21.73461 12 33 41.33 -08 17 05.1 1.1+ 0.3- 413/SS 1991 03 21.99249 12 32 56.91 -08 34 33.4 0.3- 0.2+ 046/KL 1991 03 21.99874 12 32 55.74 -08 34 59.8 0.9- 1.4- 046/KL 1991 03 22.01263 12 32 53.22 -08 35 53.7 1.0- 0.3- 046/KL 1991 03 22.02096 12 32 51.85 -08 36 25.0 1.1+ 1.4+ 046/KL 1991 03 22.54942 12 31 19.51 -09 10 53.5 0.8+ 0.9+ 413/SS 1991 03 23.59271 12 28 14.26 -10 19 58.3 0.6+ 0.5+ 372/sk 1991 03 23.59861 12 28 13.14 -10 20 22.6 0.3+ 0.5- 372/sk 1991 03 23.63819 12 28 05.88 -10 22 58.9 1.7+ 0.7- 372/sk 1991 03 23.76684 12 27 41.90 -10 31 23.5 0.1- 0.6+ 372/sk 1991 04 02.40596 11 58 38.57 -20 26 19.6 0.5+ 0.4- 413/SS 1991 04 03.42442 11 55 38.61 -21 22 43.3 1.0+ 0.7- 413/SS 1991 04 03.57951 11 55 10.43 -21 31 30.7 1.9- 0.2+ 372/sk 1991 04 03.58472 11 55 09.47 -21 31 47.9 2.0- 0.0 372/sk 1991 04 03.58889 11 55 08.73 -21 32 01.3 1.7- 0.2+ 372/sk 1991 04 05.50822 11 49 37.51 -23 13 08.0 0.6+ 0.2- 413/SS 1991 04 08.58299 11 41 09.19 -25 43 35.3 1.4+ 0.6+ 372/sk 1991 04 16.45670 11 22 26.68 -30 58 41.6 0.6+ 0.0 474/JN 1991 04 16.47348 11 22 24.54 -30 59 16.0 1.0+ 0.2- 474/JN 1991 04 18.42292 11 18 34.87 -32 03 11.2 0.3- 0.5- 413/SS 1991 04 18.55220 11 18 19.36 -32 07 15.3 1.1- 1.4- 413/SS 1991 04 20.69306 11 14 31.20 -33 11 13.5 0.5+ 0.7- 413/SS 1991 05 05.49514 10 59 30.79 -38 30 14.4 ( 3.0- 0.5-) 372/sk 1991 05 16.47431 10 59 43.51 -40 58 19.3 0.3- 0.1+ 413/SS 1991 05 18.47546 11 00 39.02 -41 20 48.1 0.1- 0.4+ 413/SS 1991 06 11.41707 11 27 52.94 -44 56 18.0 0.8- 1.3+ 474/JN 1991 06 11.43351 11 27 54.66 -44 56 27.0 0.6+ 0.5- 474/JN 1991 07 10.39531 12 28 31.87 -48 15 05.4 0.6- 0.0 474/JN 1991 07 10.42378 12 28 36.14 -48 15 14.9 0.5+ 0.3+ 474/JN ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1991 December 24