OAA computing section circular NK 556 Periodic Comet Kowal 1
The following improved orbital elements, by S. Nakano, are from 18 observations 1977 to 1991. Perturbations by all nine planets and five minor planets were taken into account. The mean residual is +/- 0.69 arc seconds. Epoch = 1992 Feb. 28.0 ET T = 1992 Mar. 14.34041 +/- 0.53060 (m.e.) ET Peri. = 174.78856 +/- 0.05507 Node = 28.12388 +/- 0.00115 (1950.0) Inc. = 4.38630 +/- 0.00010 q = 4.6716505 +/- 0.0003555 AU e = 0.2325736 +/- 0.0000598 a = 6.0874247 +/- 0.0002728 AU nß = 0.06562264 +/- 0.00000441 P = 15.019 +/- 0.0010097 years The predicted orbit for the 2007 return is as follows: T = 2007 Jan. 16.30402 ET Epoch = 2007 Jan. 20.0 ET Peri. = 172.83430 e = 0.2272883 Node = 27.74967 (1950.0) a = 6.1054876 AU Inc. = 4.33928 nß= 0.06533164 q = 4.7177815 AU P = 15.086 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 ¡ , " " " 1977 04 24.39271 14 02 11.04 -12 54 41.4 0.8- 0.7+ 675/PL 1977 04 25.39583 14 01 40.12 -12 52 37.2 0.4- 0.1+ 675/PL 1977 04 26.36389 14 01 10.33 -12 50 36.4 0.7- 0.4+ 675/PL 1977 05 17.20174 13 51 22.85 -12 10 28.8 0.2- 0.6+ 675/PL 1977 05 19.18368 13 50 36.15 -12 07 19.5 0.0 0.5+ 675/PL 1977 06 13.25046 13 44 27.76 -11 45 42.5 0.3+ 0.1- 675/PL 1977 06 17.10899 13 44 12.49 -11 45 56.8 1.9+ 2.4- 801/HO 1991 02 20.71801 11 11 19.36 +09 28 52.8 ( 3.4+ 0.3-) 413/SS 1991 02 21.40778 11 11 00.11 +09 30 42.7 0.2- 0.7- 691/ST 1991 02 21.42844 11 10 59.51 +09 30 46.4 0.4- 0.4- 691/ST 1991 02 21.45072 11 10 58.88 +09 30 50.0 0.3- 0.4- 691/ST 1991 02 22.29616 11 10 35.45 +09 33 09.5 0.2- 0.6+ 691/ST 1991 02 22.37032 11 10 33.34 +09 33 21.7 0.2+ 0.6+ 691/ST 1991 02 22.39080 11 10 32.74 +09 33 25.0 0.0 0.6+ 691/ST 1991 02 22.41787 11 10 31.99 +09 33 29.2 0.5+ 0.3+ 691/ST 1991 03 20.66806 10 57 40.48 +10 41 08.1 0.1- 0.3- 372/sk 1991 03 20.68438 10 57 40.02 +10 41 11.4 0.0 0.9+ 372/sk 1991 04 03.48281 10 51 52.22 +11 05 12.9 0.1- 1.1- 372/sk 1991 04 03.49618 10 51 51.96 +11 05 14.8 0.5+ 0.3- 372/sk ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1991 September 4