Nakano Note (Nakano wa Kangaeru noda) NK 3773 239P/LINEAR

The following improved orbital elements, by S. Nakano, are from 107 observations 1999 to 2019. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.50 arc second. Residuals on 2019 January observations were -8" for Right Ascension and +2" for Declination from the prediction in NK 1965 (= HICQ 2018/2019) with the delta-T correction = +0.002 day. See the previous orbits in NK 734 (= MPC 56804) and NK 1965. Epoch = 2018 Dec. 28.0 TT T = 2019 Jan. 10.15957 +/- 0.00008 (m.e.) TT Peri. = 220.37820 +/- 0.00007 Node = 255.90829 +/- 0.00005 (2000.0) Inc. = 11.30562 +/- 0.00002 q = 1.6494752 +/- 0.0000005 AU e = 0.6310553 +/- 0.0000001 a = 4.4707925 +/- 0.0000020 AU n' = 0.10426230 +/- 0.00000007 P = 9.453 +/- 0.0000062 years T = 2000 Feb. 17.03748 TT Epoch = 2000 Feb. 26.0 TT Peri. = 220.17991 e = 0.6319529 Node = 256.16691 (2000.0) a = 4.4539355 AU Inc. = 11.33650 n'= 0.10485477 q = 1.6392582 AU P = 9.400 years T = 2009 July 25.56530 TT Epoch = 2009 July 28.0 TT Peri. = 220.32466 e = 0.6307618 Node = 256.05308 (2000.0) a = 4.4744000 AU Inc. = 11.30590 n'= 0.10413623 q = 1.6521192 AU P = 9.465 years The predicted orbit for the 2028 return is as follows: T = 2028 June 17.88700 TT Epoch = 2028 May 29.0 TT Peri. = 220.54521 e = 0.6313744 Node = 255.85951 (2000.0) a = 4.4571672 AU Inc. = 11.30573 n'= 0.10474075 q = 1.6430258 AU P = 9.410 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 000113 046 0.3+ 0.5+ 181008 461 0.1+ 0.4+ 991114 704 0.5+ 0.3- 000113 046 0.2+ 0.3+ 181009 461 0.2+ 0.3+ 991114 704 0.2+ 0.0 000203 402 (8.9+ 3.7+) 181009 461 0.1+ 0.3+ 991114 704 0.8- 0.2+ 000203 402 (8.9+ 8.7+) 181009 461 0.0 0.3+ 991114 704 0.3- 0.3- 000226 413 0.1+ 0.1- 181009 461 0.2+ 0.3+ 991116 704 0.0 1.3- 000226 413 0.0 0.1+ 181010 G96 0.1+ 0.0 991116 704 0.4- 1.7- 000227 693 0.1- 0.1- 181010 G96 0.1+ 0.1+ 991116 704 0.6- 1.0- 000227 693 0.1- 0.1- 181010 G96 0.1+ 0.3- 991116 704 (0.3- 2.6-) 000301 402 1.4+ 0.5+ 181010 G96 0.3+ 0.1- 991207 704 0.1+ 0.3- 000301 402 0.4+ 0.0 181102 H06 0.0 0.3+ 991207 704 0.5- 0.2+ 000301 402 0.1- 1.7- 181102 H06 0.2+ 0.1- 991207 704 0.1- 0.5- 000301 360 0.4+ 0.5+ 181102 H06 0.3+ 0.1- 991207 704 0.1+ 0.2+ 000301 360 0.2+ 0.5+ 181115 Q11 0.2+ 0.1+ 991207 704 0.1+ 0.5- 000301 360 0.1+ 0.6+ 181115 Q11 0.2+ 0.0 991208 704 0.2- 0.4- 000330 360 0.2+ 0.4+ 181115 Q11 0.2+ 0.1+ 991208 704 0.4- 0.0 000330 360 0.8+ 0.1+ 181129 Q11 0.4+ 0.4+ 991208 704 0.1- 0.2- 000424 360 0.5+ 0.2- 181129 Q11 0.2+ 0.4+ 991208 704 0.2- 0.0 000424 360 0.2+ 0.3- 181214 Q11 0.1+ 0.3- 991208 704 0.2- 0.1+ 000424 360 0.2- 1.1- 181214 Q11 0.2+ 0.3- 2000/ 000501 695 1.6+ 0.6+ 181214 Q11 0.2+ 0.3- 000105 704 0.1+ 0.0 000501 695 1.5+ 0.5+ 181215 349 0.5- 0.4- 000105 704 0.1- 0.3+ 000501 695 0.5+ 0.9+ 181215 349 0.4- 0.6- 000105 704 0.0 0.8- 2008/ 181231 Q11 0.1+ 0.3- 000105 704 0.4- 0.1- 081031 G96 0.6- 1.4+ 181231 Q11 0.1+ 0.4- 000105 704 0.8- 0.6- 081031 G96 0.4+ 0.7+ 181231 Q11 0.0 0.3- 000106 704 0.2- 0.7+ 081031 G96 0.1+ 0.6+ 2019/ 000106 704 0.2- 0.3+ 081031 G96 0.5+ 0.7+ 190101 H06 0.1- 0.1- 000106 704 0.3- 0.3+ 2010/ 190101 H06 0.0 0.3- 000106 704 0.5- 0.4+ 100201 C51 0.4- 0.4- 190101 349 0.0 0.5+ 000106 704 0.1- 0.0 100201 C51 1.2- 0.7- 190101 349 0.2- 0.3+ 000113 046 0.9+ 0.2+ 100201 C51 0.1- 1.6+ 190112 D95 0.1- 0.2- 000113 046 0.1- 0.0 100201 C51 0.3- 0.2+ 190112 D95 0.0 0.1- 000113 046 0.5- 0.6+ 100201 C51 0.8+ 0.3- 190112 D95 0.1- 0.1- 000113 046 1.3+ 1.2+ 100202 C51 0.3+ 0.1+ 190117 D88 0.4- 0.6- 000113 046 0.3+ 0.7+ 100202 C51 0.1+ 0.9+ 190117 D88 0.2- 0.2- 000113 046 0.6- 0.8+ 100202 C51 0.1- 1.4- 190117 D88 0.4- 0.1- 000113 046 0.2- 0.6+ 100202 C51 0.2- 0.4- 190117 L27 (1.5- 3.0+) 000113 046 0.1- 0.1- 2018/ 190118 L27 0.6- 0.4+ 000113 046 0.0 0.1+ 181008 461 0.5+ 0.3+ 190118 L27 0.3- 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 Feb. 1

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