Nakano Note (Nakano wa Kangaeru noda) NK 2023 231P/LINEAR-NEAT

The following improved orbital elements, by S. Nakano, are from 152 observations 1950 to 2010. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.68 arc second. The 1950 observations (mag.= 15.6; the object is almost stellar) were found by M. Meyer. See the previous orbits in NK1015, NK 1865 (= HICQ 2010/2011). Epoch = 2011 Apr. 29.0 TT T = 2011 May 16.70022 +/- 0.00057 (m.e.) TT Peri. = 42.47230 +/- 0.00012 Node = 133.09914 +/- 0.00011 (2000.0) Inc. = 12.32643 +/- 0.00003 q = 3.0328650 +/- 0.0000020 AU e = 0.2465522 +/- 0.0000004 a = 4.0253155 +/- 0.0000009 AU n' = 0.12204056 +/- 0.00000004 P = 8.076 +/- 0.0000026 years T = 1950 Feb. 23.86675 TT Epoch = 1950 Feb. 8.0 TT Peri. = 39.79198 e = 0.2796214 Node = 135.22085 (2000.0) a = 3.8550657 AU Inc. = 12.64349 n'= 0.13021362 q = 2.7771067 AU P = 7.569 years [ T = 1957 Sept. 8.70069 TT Epoch = 1957 Aug. 30.0 TT Peri. = 39.45806 e = 0.2812418 Node = 135.22350 (2000.0) a = 3.8489797 AU Inc. = 12.64809 n'= 0.13052258 q = 2.7664856 AU P = 7.551 years ] [ T = 1965 Mar. 14.01832 TT Epoch = 1965 Mar. 21.0 TT Peri. = 38.90220 e = 0.2830272 Node = 135.10335 (2000.0) a = 3.8401840 AU Inc. = 12.65436 n'= 0.13097126 q = 2.7533074 AU P = 7.525 years ] [ T = 1972 Sept.29.20605 TT Epoch = 1972 Oct. 10.0 TT Peri. = 39.33355 e = 0.2826286 Node = 135.00983 (2000.0) a = 3.8405182 AU Inc. = 12.65232 n'= 0.13095417 q = 2.7550780 AU P = 7.526 years ] [ T = 1980 Apr. 8.11525 TT Epoch = 1980 Mar. 22.0 TT Peri. = 38.76993 e = 0.2808094 Node = 134.96325 (2000.0) a = 3.8563111 AU Inc. = 12.63724 n'= 0.13015054 q = 2.7734227 AU P = 7.573 years ] [ T = 1987 Oct. 29.45462 TT Epoch = 1987 Oct. 12.0 TT Peri. = 38.42143 e = 0.2786055 Node = 134.93151 (2000.0) a = 3.8607706 AU Inc. = 12.62531 n'= 0.12992510 q = 2.7851385 AU P = 7.586 years ] [ T = 1995 June 1.50836 TT Epoch = 1995 June 12.0 TT Peri. = 38.67650 e = 0.2800977 Node = 134.87294 (2000.0) a = 3.8543229 AU Inc. = 12.63371 n'= 0.13025126 q = 2.7747359 AU P = 7.567 years ] T = 2003 Apr. 29.36790 TT Epoch = 2003 May 1.0 TT Peri. = 42.62427 e = 0.2485660 Node = 133.12577 (2000.0) a = 4.0148334 AU Inc. = 12.33923 n'= 0.12251881 q = 3.0168823 AU P = 8.045 years The predicted orbit for the 2019 return is as follows: T = 2019 June 14.25981 TT Epoch = 2019 June 6.0 TT Peri. = 42.75103 e = 0.2475770 Node = 133.02929 (2000.0) a = 4.0170428 AU Inc. = 12.33410 n'= 0.12241775 q = 3.0225154 AU P = 8.051 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1950/ 030322 246 0.3+ 0.4- 030420 246 0.2+ 0.9- 500420 261 0.3+ 0.5+ 030322 246 0.1- 0.5- 030420 246 0.2+ 0.7- 500420 261 0.2- 0.4- 030322 246 0.5+ 0.4- 030420 213 1.1+ 0.4- 2003/ 030322 246 0.0 0.5- 030420 213 1.1+ 0.8- 030201 704 0.2- 0.4+ 030322 246 0.1- 0.5- 030420 213 0.6- 1.7+ 030201 704 0.6+ 0.1+ 030322 246 0.2- 0.3- 030421 360 1.4+ 0.5- 030201 704 0.8- 1.1+ 030322 213 (1.1+ 2.2-) 030421 360 1.8+ 0.5- 030201 704 0.6- 0.2+ 030322 213 (2.3+ 0.6+) 030421 360 1.2+ 1.1- 030203 699 (2.8- 1.1+) 030322 204 0.6+ 0.3- 030502 360 0.8+ 0.1- 030203 699 1.6- 0.3+ 030322 204 0.5+ 0.5- 030502 360 0.2+ 0.4+ 030203 699 1.2- 0.3+ 030322 204 0.4- 0.1+ 030505 J95 0.3+ 0.1+ 030203 699 1.8- 0.5+ 030323 673 0.1- 0.4+ 030505 J95 0.2- 0.3+ 030204 704 0.0 0.7+ 030323 673 0.2- 0.2+ 030505 J95 0.2- 0.1+ 030204 704 1.1- 0.2+ 030323 673 0.5- 0.2+ 030506 118 1.1+ 0.3+ 030204 704 0.5+ 1.0+ 030323 673 0.5- 0.4+ 030506 118 1.0+ 0.7+ 030228 704 1.4- 0.8+ 030323 246 0.1+ 0.1+ 030506 118 1.6+ 1.0+ 030228 704 1.7- 0.2+ 030323 246 0.2+ 0.2- 030506 118 1.2+ 0.5+ 030228 704 1.5- 0.5+ 030323 246 0.1- 0.1- 030507 118 1.2+ 0.8- 030310 644 0.1+ 0.2- 030323 246 0.1+ 0.1- 030507 118 1.4+ 1.3+ 030310 644 0.3- 0.4- 030323 246 0.1+ 0.3- 030507 118 1.6+ 1.6+ 030310 644 0.6- 0.1+ 030323 246 0.2+ 0.1- 030507 118 1.3+ 1.1+ 030311 649 0.5- 0.2- 030323 246 0.0 0.5- 030523 360 0.8+ 0.5+ 030311 649 0.4- 0.1- 030325 372 0.2- 0.7- 030523 360 0.7+ 0.9+ 030311 926 0.7- 0.1+ 030326 691 0.2- 0.1+ 030528 620 0.9+ 0.6- 030311 670 0.0 0.3+ 030326 691 0.2- 0.0 030528 620 (2.2+ 0.4-) 030311 448 0.1- 0.1+ 030326 691 0.5- 0.2+ 030605 360 0.8+ 0.3+ 030311 448 0.8- 0.4+ 030326 372 0.6- 0.0 030605 360 0.8+ 0.4- 030311 926 0.5- 0.3- 030326 360 0.5- 0.7- 030625 448 (2.6- 3.0+) 030311 448 0.7- 0.1- 030326 360 0.0 0.5- 030625 448 0.3- 0.8+ 030311 448 0.8- 0.1- 030326 360 0.2- 0.3- 030625 448 0.3+ 0.6+ 030311 926 0.5- 0.0 030329 360 0.1- 0.5- 030626 448 1.1+ 1.0- 030311 649 0.8- 0.2- 030329 360 0.3- 0.3- 030626 448 1.9+ 1.2- 030311 670 0.5- 1.4+ 030329 360 0.2- 0.2- 030626 448 (2.6+ 0.4-) 030311 644 0.3- 0.3+ 030401 704 1.2+ 1.2+ 2009/ 030311 644 0.1- 0.4+ 030401 704 (1.6+ 2.0+) 091211 H36 0.2+ 0.2+ 030311 644 0.1- 0.2+ 030401 704 0.9- 1.0+ 091211 H36 0.3+ 0.0 030312 850 1.4- 0.3- 030404 246 0.1+ 0.2- 091211 H36 0.6- 0.3- 030312 850 0.4- 0.1+ 030404 246 0.8+ 0.5- 091215 H36 0.8+ 0.2+ 030312 850 0.9- 0.6- 030404 246 1.0+ 0.3- 091215 H36 0.5- 0.0 030312 670 0.2- 0.2+ 030404 246 1.0+ 0.4- 091215 H36 1.5+ 0.2+ 030312 854 0.1+ 0.3+ 030404 246 0.7+ 0.0 091216 H36 1.4- 0.1+ 030312 854 0.4+ 0.8- 030404 246 0.5+ 0.3- 091216 H36 1.1+ 0.8+ 030312 854 1.1+ 0.0 030404 170 0.5+ 0.5+ 091218 204 1.4- 0.2+ 030312 670 0.9- 0.1- 030404 170 0.7+ 0.0 2010/ 030312 673 0.3- 0.6+ 030405 170 0.7+ 0.0 100118 204 0.8+ 0.6- 030312 673 0.1- 0.5+ 030405 170 0.8+ 0.2- 100119 204 1.1+ 0.2+ 030312 673 0.4- 0.6+ 030406 J95 0.3+ 0.8- 101201 H10 0.5- 0.2+ 030312 673 0.5- 0.1- 030407 J95 0.4+ 0.2- 101202 691 1.0- 0.2+ 030313 J95 1.0- 0.5+ 030407 J95 0.2+ 0.1- 101202 691 1.3- 0.6+ 030313 J95 0.5- 0.2- 030410 691 0.0 0.2- 101207 H10 0.2- 0.8+ 030320 204 0.3- 0.3+ 030410 691 0.2+ 0.8- 101207 H10 0.9- 0.9+ 030320 204 0.9- 0.4- 030410 691 0.2+ 0.6- 101207 H10 0.5- 0.3- 030321 213 (0.2- 2.4-) 030420 246 0.0 1.0- 101208 H06 0.8+ 0.6- 030321 213 (2.2- 4.5-) 030420 246 0.2+ 0.7- 101208 H06 0.8+ 1.0- 030321 213 (2.3- 1.4+) 030420 246 0.2- 0.9- 101208 H06 1.2+ 1.5- 030321 213 (0.8+ 2.0+) 030420 246 0.3- 0.4- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2010 Jan. 8

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