Nakano Note (Nakano wa Kangaeru noda) NK 3940 97P/Metcalf-Brewington

The following improved orbital elements, by S. Nakano, are from 197 observations 1991 to 2012, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 0.81 arc second. The comet has passed 0.11 AU from Jupiter on 1993 Mar. 28 UT. See the previous orbits in NK 398 (1983 prediction), NK 551, NK 674 (= MPC 31663), MPC 41159, NK 1608 and NK 2168. Epoch = 2011 Aug. 27.0 TT T = 2011 Aug. 20.95137 +/- 0.00142 (m.e.) TT Peri. = 228.21104 +/- 0.00033 Node = 185.20781 +/- 0.00005 (2000.0) Inc. = 17.88620 +/- 0.00003 q = 2.5967051 +/- 0.0000058 AU e = 0.4593151 +/- 0.0000016 a = 4.8026222 +/- 0.0000178 AU n' = 0.09364540 +/- 0.00000052 P = 10.525 +/- 0.0000584 years A1 = +1.151 +/- 0.449 A2 = -1.60691 +/- 0.04081 T = 1991 Jan. 5.63178 TT Epoch = 1991 Jan. 24.0 TT Peri. = 208.05171 e = 0.5938883 Node = 187.78824 (2000.0) a = 3.9188345 AU Inc. = 13.02825 n'= 0.12704825 q = 1.5914844 AU P = 7.758 years T = 2001 Apr. 15.01169 TT Epoch = 2001 Apr. 1.0 TT Peri. = 229.71582 e = 0.4564217 Node = 186.43855 (2000.0) a = 4.8033267 AU Inc. = 17.98517 n'= 0.09362480 q = 2.6109842 AU P = 10.527 years The predicted orbit for the 2022 return is as follows: T = 2022 Feb. 15.51640 TT Epoch = 2022 Mar. 2.0 TT Peri. = 229.96650 e = 0.4599097 Node = 184.07858 (2000.0) a = 4.7588059 AU Inc. = 17.95212 n'= 0.09494172 q = 2.5701849 AU P = 10.381 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1991/ 910403 372 (3.6- 0.7-) 110903 C10 0.4- 0.4- 910105 412 (5.4+ 3.5-) 910403 372 0.7- 1.4- 110905 C10 0.3+ 1.4- 910105 412 (0.8- 3.2-) 2000/ 110905 C10 1.1+ 0.6- 910107 897 (5.1+ 0.2+) 000901 704 0.2- 0.9+ 111003 C32 0.1+ 0.1- 910107 897 (4.2+ 1.1+) 000901 704 0.6- 1.2+ 111004 C32 0.1+ 0.1- 910108 413 0.3+ 0.9+ 000901 704 0.0 0.3- 111004 C32 0.7+ 0.6- 910108 026 0.3+ 1.1+ 000901 704 0.7- 0.9+ 111009 C32 0.6+ 0.9- 910109 411 0.8- 0.7+ 000902 699 (3.0- 0.1-) 111009 C32 1.6+ 0.2- 910109 411 0.0 0.3+ 000902 699 1.1- 0.2- 111022 C32 1.5+ 1.0- 910109 413 0.8+ 1.2+ 000902 699 1.5- 0.3+ 111022 C32 0.9+ 0.4+ 910109 413 0.5- 0.1- 000902 699 0.6- 0.1- 111022 C32 0.3+ 1.1+ 910109 372 0.4- 0.3+ 000903 704 (1.0- 2.0+) 111022 C32 0.1+ 0.3+ 910109 372 0.4- 1.4+ 000903 704 0.1+ 0.9+ 111024 C10 1.1+ 0.1+ 910109 323 0.8+ 0.4- 000905 704 0.5+ 1.5+ 111024 C10 (2.4- 1.5+) 910109 026 1.1- 1.3- 000905 704 0.2+ 1.8+ 111030 H06 1.4+ 0.4+ 910110 897 0.1+ 0.4- 000905 704 0.4+ 1.6+ 111030 H06 1.4+ 0.7- 910110 897 2.0+ 0.4- 000905 704 0.3- 1.9+ 111104 I40 0.2- 0.2+ 910110 401 0.1- 0.3- 000909 540 0.5- 0.0 111104 I40 (2.8+ 0.1-) 910110 401 0.7- 0.7- 000909 540 1.5- 0.9+ 111104 I40 0.6+ 0.0 910110 323 0.1+ 0.0 000909 540 0.5- 0.8+ 111104 I40 0.2- 0.2- 910110 503 0.4+ 0.8+ 000924 704 0.2- 0.1+ 111104 I40 0.3+ 0.2+ 910111 415 0.3- 0.9+ 000924 691 1.3- 0.5- 111104 I40 0.0 0.3- 910111 415 0.4- 1.2+ 000924 704 0.7- 0.1+ 111104 C32 1.1- 1.2- 910111 323 1.1+ 0.9- 000924 704 1.6- 0.1- 111104 C32 0.0 0.1+ 910112 372 0.3- 2.2+ 000924 691 0.8- 0.3- 111118 C32 0.6- 0.6- 910112 474 (2.5- 1.7+) 000924 704 0.6- 0.9- 111118 C32 0.3+ 0.0 910112 474 1.5- 2.3+ 000924 691 0.4- 1.2+ 111118 C32 0.3- 0.1- 910113 372 0.4- 0.6+ 000926 704 0.2+ 0.3- 111118 C32 0.7- 0.5- 910113 984 0.2+ 0.4+ 000926 704 0.3+ 0.3+ 111120 C10 0.1- 0.5- 910113 801 0.6+ 0.1+ 000926 704 0.2- 0.2- 111120 C10 0.3- 0.6- 910113 801 0.4+ 0.3+ 000926 704 0.1+ 0.3- 111128 213 0.2- 1.5- 910113 801 0.4+ 0.2+ 000926 704 0.1- 0.6- 111128 213 1.0- 0.0 910114 503 0.1+ 0.0 000926 360 0.1- 0.2+ 111128 213 1.6- 0.3+ 910115 897 0.6+ 0.2- 000926 360 0.6- 0.7+ 111129 C10 0.4+ 0.5- 910115 372 0.3+ 0.0 000926 360 0.4- 0.1- 111129 C10 0.5+ 0.2- 910115 364 0.4- 0.8- 001001 704 0.2+ 0.8+ 111201 I40 1.0- 0.0 910115 364 0.5- 0.0 001001 704 0.1- 0.3+ 111201 I40 0.1+ 0.4+ 910115 875 1.0- 0.4+ 001001 704 1.1- 0.2- 111201 I40 0.7+ 0.5+ 910115 875 2.2- 0.0 001002 704 0.2- 0.8+ 111203 J47 1.0- 0.1+ 910117 474 1.4- 1.5+ 001002 704 0.4+ 0.6+ 111203 J47 0.8- 0.2+ 910117 474 1.8- 0.4+ 001002 704 0.5+ 1.0+ 111203 J47 0.5- 0.5+ 910117 364 0.2- 2.3- 001002 704 0.8- 1.0+ 111217 J01 0.1+ 0.7+ 910117 364 0.4+ 0.9- 001002 704 0.2+ 1.1+ 111217 J01 0.3+ 0.8+ 910117 984 1.6- 0.7- 001005 402 0.8+ 0.8+ 111217 J01 0.5+ 0.1+ 910117 801 0.4+ 1.0- 001005 402 0.2- 0.2- 111217 J01 0.3+ 0.5+ 910118 026 1.5+ 0.4- 001005 402 0.1+ 0.5- 111217 J01 0.2+ 0.7+ 910119 897 0.9- 0.7- 001029 704 0.7+ 1.8+ 111225 349 0.9- 1.0+ 910119 897 0.3- 1.2+ 001029 704 0.2+ 0.5- 111225 349 0.1+ 0.5- 910119 897 (2.5+ 0.1-) 001029 704 0.9- 1.2- 111226 215 0.3+ 0.9- 910120 657 0.1+ 0.4+ 001029 704 0.1- 1.8- 111226 215 0.2+ 0.3- 910122 364 0.2- 1.4+ 001103 360 0.5+ 0.9- 111226 215 0.1- 0.3+ 910122 364 1.3+ 0.0 001103 360 0.7+ 0.1+ 111226 C10 0.2- 0.4+ 910125 046 1.3- 1.0- 001118 699 0.1- 0.0 111226 C10 0.2- 0.4- 910125 046 (2.6- 0.7+) 001118 699 1.8+ 0.0 111226 C10 0.4- 0.0 910201 046 1.2+ 0.8- 001118 699 1.0+ 1.6- 111227 213 (0.8+ 2.9-) 910201 046 1.5+ 0.3+ 001118 699 0.6- 0.6- 111228 213 0.5+ 1.1+ 910202 056 (4.3+ 0.1-) 001119 699 1.3+ 0.4+ 111228 213 0.8+ 0.1- 910202 046 1.8- 1.0- 001119 699 1.3+ 0.9- 111229 C32 1.5- 1.9+ 910202 046 1.4- 0.2+ 001119 699 0.8+ 0.9+ 111229 C32 0.7+ 0.0 910202 056 (5.6+ 1.8-) 001119 699 1.1+ 0.6- 111229 C32 1.2- 0.2+ 910203 056 (4.0+ 0.9-) 001122 360 0.5+ 0.4- 111230 D90 (0.9- 2.4+) 910203 056 (5.4+ 0.6-) 001122 360 0.1+ 0.1+ 111230 D90 0.6+ 0.9+ 910204 323 0.7+ 0.8- 001129 322 (3.5+ 2.1-) 2012/ 910204 026 1.8- 1.3- 001129 322 (5.1+ 1.3-) 120114 511 (3.2+ 1.7-) 910205 323 (2.8+ 0.9-) 001129 322 (0.2+ 2.9-) 120114 511 0.2+ 0.7+ 910206 323 1.3+ 0.6- 001215 402 (2.0+ 1.4-) 120116 E07 1.0+ 0.0 910207 323 2.0+ 0.1- 001215 402 (2.6+ 0.6-) 120116 E07 0.3+ 0.5+ 910208 323 1.3+ 0.9+ 001215 402 (2.9+ 0.8+) 120117 104 1.2- 0.6- 910209 801 0.4+ 0.9+ 001222 360 1.0+ 0.3- 120117 104 1.0- 0.3+ 910211 801 1.2+ 0.6+ 001222 360 1.1+ 0.5- 120123 E07 1.3- 0.3+ 910216 801 0.6+ 0.6- 001223 704 0.8+ 0.3+ 120123 E07 0.5- 0.1+ 910217 046 0.0 1.0- 001223 704 1.4+ 0.2+ 120123 E07 0.8- 1.5+ 910217 046 0.8- 0.2+ 001223 704 0.4+ 1.2- 120128 E07 0.5+ 0.2+ 910218 046 0.2- 1.2- 2011/ 120128 E07 0.6- 0.4+ 910218 046 1.5+ 0.0 110831 C10 (2.6+ 0.2+) 121208 C23 (9.0+ 9.0-) 910302 984 (1.0+ 3.7-) 110831 C10 0.9+ 0.7- 121208 C23 (8.6+ 8.7-) 910303 897 2.0+ 0.1- 110903 C10 0.1+ 0.2- 121231 900 (7.3+ 7.0-) 910303 897 (1.4+ 5.9+) 110903 C10 0.7- 1.0- 121231 900(10.5+ 4.5-) ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 Nov. 23

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