OAA computing section circular NK 456 Periodic Comet Boethin 1975 I = 1975a
The following improved orbital elements, by S. Nakano, are from 37 observations 1975 February 5 to 1975 June 3. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.30 arc seconds: Epoch = 1974 Dec. 19.0 ET T = 1975 Jan. 5.62200 +/- 0.00562 (m.e.) ET Peri. = 11.11427 +/- 0.02504 Node = 26.97421 +/- 0.02483 1950.0 Inc. = 5.91185 +/- 0.00196 q = 1.0936028 +/- 0.0009812 AU e = 0.7793370 +/- 0.0001345 a = 4.9559857 +/- 0.0032623 AU nß = 0.089332401 +/- 0.000088204 P = 11.033 +/- 0.010894 years (+/- 3.98 days) The following prediction for the 1986 return is from the above orbital elements: T = 1986 Jan. 19.93880 ET Epoch = 1986 Jan. 10.0 ET Peri. = 11.63135 e = 0.7778632 Node = 25.84059 1950.0 a = 5.0158272 AU Inc. = 5.75380 nß= 0.087738505 q = 1.1141998 AU P = 11.233 years m1 = 10.6 (k=15.0) m2 = 15.5 (k=5.0) The residuals from the above orbit are as follows: Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1975 Feb. 5.40422 1 13 23.85 +12 20 06.6 0.9- 0.6- 385/ur 5.40833 1 13 25.06 +12 20 15.8 1.2+ 0.9+ 385/ur 8.42014 1 26 35.22 +13 52 40.3 0.1- 0.0 380/kj 8.43889 1 26 40.12 +13 53 13.9 0.2- 0.4- 372/sk 8.44583 1 26 41.85 +13 53 29.2 1.5- 2.5+ 372/sk 8.48160 1 26 50.98 +13 54 30.2 ( 4.7- 0.6-) 882/sz 8.48681 1 26 52.36 +13 54 43.6 ( 4.5- 3.4+) 882/sz 8.98704 1 29 03.83 +14 09 43.9 ( 9.6- 3.3+) 801/mc 9.06521 1 29 24.75 +14 11 59.4 ( 3.1- 0.9-) 801/mc 9.40417 1 30 54.26 +14 22 07.1 1.0- 0.8- 385/ur 9.41007 1 30 55.66 +14 22 16.6 ( 3.1- 1.8-) 385/ur 9.43125 1 31 01.54 +14 22 51.0 ( 1.7+ 5.1-) 882/sz 9.43233 1 31 01.59 +14 23 01.3 ( 1.6- 3.4+) 387/so 9.43924 1 31 03.61 +14 23 09.9 1.4+ 0.4- 882/sz 9.45324 1 31 07.18 +14 23 35.6 0.0 0.4+ 380/kj 9.46909 1 31 11.27 +14 24 01.9 0.9- 1.4- 380/kj 10.41198 1 35 20.10 +14 51 57.2 ( 1.1+ 3.3+) 385/ur 10.74861 1 36 48.94 +15 01 45.7 0.6+ 2.5+ 056/an 10.75491 1 36 50.31 +15 01 50.0 ( 3.8- 4.3-) 046/mr 10.78789 1 36 59.16 +15 02 51.6 1.1- 0.2- 046/mr - continued - Periodic Comet Boethin NK 456-2 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1975 Feb. 10.81250 1 37 05.40 +15 03 36.3 ( 4.2- 1.7+) 056/an 11.39931 1 39 40.75 +15 20 40.2 1.1+ 1.6+ 387/tm 11.40417 1 39 41.91 +15 20 45.0 0.6- 2.2- 385/ur 11.41736 1 39 45.57 +15 21 03.8 ( 2.3+ 6.0-) 387/tm 11.42917 1 39 48.48 +15 21 30.1 0.6- 0.5- 372/sk 11.43889 1 39 50.92 +15 21 46.0 2.2- 1.4- 372/sk 11.46354 1 39 57.47 +15 22 33.9 ( 1.0- 4.3+) 882/sz 11.68710 1 40 57.65 +15 29 05.1 (12.6+ 9.3+) 073/cs 11.70112 1 41 01.35 +15 29 34.9 (13.0+ 15.0+) 073/cs 11.74518 1 41 12.03 +15 30 34.3 0.9- 1.2- 046/mr 11.75144 1 41 13.20 +15 30 43.7 ( 7.7- 2.5-) 046/mr 12.74205 1 45 35.72 +15 59 00.1 2.0+ 1.7- 046/mr 13.40000 1 48 29.75 +16 17 35.8 ( 3.0+ 1.2+) 385/ur 13.40417 1 48 30.78 +16 17 42.9 2.1+ 1.4+ 385/ur 13.40833 1 48 31.86 +16 17 49.4 1.9+ 0.9+ 385/ur 13.81774 1 50 20.00 +16 29 07.2 ( 0.2- 5.2-) 022/fe 13.82813 1 50 22.74 +16 29 35.5 ( 0.1- 5.9+) 022/fe 15.40104 1 57 19.10 +17 12 37.0 0.4- 1.9- 385/ur 15.40498 1 57 20.35 +17 12 46.8 2.7+ 1.5+ 385/ur 28.50035 2 54 48.67 +22 21 00.0 0.3- 0.0 372/sk 28.76448 2 55 57.10 +22 26 11.9 ( 6.5- 0.8-) 046/mr 28.77212 2 55 59.24 +22 26 21.4 ( 4.3- 0.3-) 046/mr Mar. 3.17917 3 06 23.30 +23 12 06.2 0.2+ 1.8- 688/gc 3.53264 3 07 54.3 +23 18 34 2.4- 0.1- 372/sk Y 5.06083 3 14 27.62 +23 45 34.1 0.9- 0.4- 801/mc 5.20069 3 15 03.67 +23 47 54.4 ( 2.4+ 4.7-) 688/gc 7.15532 3 23 22.81 +24 20 28.0 1.6- 1.0+ 691/rm 7.16574 3 23 25.48 +24 20 38.1 1.2- 1.2+ 691/rm 7.51111 3 24 53.15 +24 26 06.0 ( 3.2- 0.9-) 372/sk 10.22813 3 36 20.10 +25 07 05.3 2.3+ 0.3- 702/he 14.15590 3 52 37.45 +25 59 09.6 ( 3.3+ 3.1-) 702/he 14.17431 3 52 41.70 +25 59 26.8 0.3- 0.6+ 693/rm 14.19792 3 52 47.53 +25 59 42.9 0.1+ 0.3- 693/rm 16.53681 4 02 19.9 +26 26 51 0.5+ 2.7+ 372/sk Y 30.87986 4 57 50.51 +28 15 50.3 ( 2.5- 4.0-) 993/wf Apr. 3.47361 5 10 53.3 +28 29 46 ( 4.3+ 1.0-) 372/sk Y 9.14236 5 30 43.51 +28 42 26.7 2.0+ 0.7- 693/rm 9.19028 5 30 53.27 +28 42 30.1 1.6+ 0.5- 693/rm 29.05890 6 33 33.74 +28 17 11.2 2.2- 0.5- 801/sw 30.06524 6 36 28.12 +28 13 40.3 2.2- 0.4+ 801/sw May 4.15625 6 48 02.56 +27 57 34.1 0.8+ 1.1- 691/rm June 3.18056 8 02 27.96 +24 57 38.0 0.9+ 0.5+ 691/rm ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1984 May 8