Nakano Note (Nakano wa Kangaeru noda) NK 1865 231P/LINEAR-NEAT (2003 CP7 = 2009 X1)
The following improved orbital elements, by S. Nakano, are from 144 observations 1950 to 2009. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. The delta-T correction is -0.37 day for the prediction in NK 1015 with the runoff of +230" in R. A. and +37" in Decl.. The 1950 identification (mag. = 15.6; the object is almost stellar) was found by M. Meyer. Epoch = 2011 Apr. 29.0 TT T = 2011 May 16.67732 +/- 0.00352 (m.e.) TT Peri. = 42.47109 +/- 0.00023 Node = 133.09919 +/- 0.00013 (2000.0) Inc. = 12.32632 +/- 0.00004 q = 3.0328053 +/- 0.0000092 AU e = 0.2465644 +/- 0.0000019 a = 4.0253013 +/- 0.0000039 AU n' = 0.12204121 +/- 0.00000018 P = 8.076 +/- 0.0000119 years T = 1950 Feb. 23.86348 TT Epoch = 1950 Feb. 8.0 TT Peri. = 39.79134 e = 0.2796298 Node = 135.22056 (2000.0) a = 3.8550683 AU Inc. = 12.64333 n'= 0.13021349 q = 2.7770764 AU P = 7.569 years [ T = 1957 Sept. 8.70033 TT Epoch = 1957 Aug. 30.0 TT Peri. = 39.45746 e = 0.2812502 Node = 135.22321 (2000.0) a = 3.8489819 AU Inc. = 12.64793 n'= 0.13052247 q = 2.7664550 AU P = 7.551 years ] [ T = 1965 Mar. 14.02038 TT Epoch = 1965 Mar. 21.0 TT Peri. = 38.90164 e = 0.2830357 Node = 135.10305 (2000.0) a = 3.8401855 AU Inc. = 12.65419 n'= 0.13097119 q = 2.7532757 AU P = 7.525 years ] [ T = 1972 Sept.29.20965 TT Epoch = 1972 Oct. 10.0 TT Peri. = 39.33297 e = 0.2826371 Node = 135.00954 (2000.0) a = 3.8405200 AU Inc. = 12.65216 n'= 0.13095408 q = 2.7550467 AU P = 7.526 years ] [ T = 1980 Apr. 8.12036 TT Epoch = 1980 Mar. 22.0 TT Peri. = 38.76940 e = 0.2808182 Node = 134.96297 (2000.0) a = 3.8563116 AU Inc. = 12.63708 n'= 0.13015052 q = 2.7733891 AU P = 7.573 years ] [ T = 1987 Oct. 29.46009 TT Epoch = 1987 Oct. 12.0 TT Peri. = 38.42091 e = 0.2786144 Node = 134.93123 (2000.0) a = 3.8607709 AU Inc. = 12.62515 n'= 0.12992509 q = 2.7851046 AU P = 7.586 years ] [ T = 1995 June 1.51433 TT Epoch = 1995 June 12.0 TT Peri. = 38.67597 e = 0.2801065 Node = 134.87266 (2000.0) a = 3.8543234 AU Inc. = 12.63355 n'= 0.13025124 q = 2.7747022 AU P = 7.567 years ] T = 2003 Apr. 29.36050 TT Epoch = 2003 May 1.0 TT Peri. = 42.62306 e = 0.2485781 Node = 133.12582 (2000.0) a = 4.0148191 AU Inc. = 12.33911 n'= 0.12251947 q = 3.0168229 AU P = 8.044 years The predicted orbit for the 2019 return is as follows: T = 2019 June 14.22068 TT Epoch = 2019 June 6.0 TT Peri. = 42.74980 e = 0.2475892 Node = 133.02934 (2000.0) a = 4.0170281 AU Inc. = 12.33398 n'= 0.12241842 q = 3.0224555 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/ 030321 213 (0.1- 2.5-) 030407 J95 0.2+ 0.2- 500420 261 0.3+ 0.6+ 030321 213 (2.2- 4.6-) 030410 691 0.0 0.3- 500420 261 0.2- 0.3- 030321 213 (2.2- 1.3+) 030410 691 0.2+ 1.0- 2003/ 030321 213 0.9+ 1.9+ 030410 691 0.2+ 0.7- 030201 704 0.0 0.6+ 030322 246 0.4+ 0.5- 030420 246 0.1- 1.1- 030201 704 0.8+ 0.4+ 030322 246 0.0 0.6- 030420 246 0.1+ 0.8- 030201 704 0.6- 1.3+ 030322 246 0.6+ 0.5- 030420 246 0.3- 1.0- 030201 704 0.4- 0.5+ 030322 246 0.0 0.6- 030420 246 0.4- 0.5- 030203 699 (2.7- 1.3+) 030322 246 0.0 0.6- 030420 246 0.0 1.0- 030203 699 1.5- 0.5+ 030322 246 0.1- 0.4- 030420 246 0.1+ 0.8- 030203 699 1.0- 0.6+ 030322 213 (1.2+ 2.3-) 030420 213 0.9+ 0.5- 030203 699 1.7- 0.7+ 030322 213 (2.4+ 0.5+) 030420 213 1.0+ 0.9- 030204 704 0.1+ 1.0+ 030322 204 0.6+ 0.4- 030420 213 0.7- 1.6+ 030204 704 0.9- 0.4+ 030322 204 0.6+ 0.6- 030421 360 1.3+ 0.6- 030204 704 0.7+ 1.2+ 030322 204 0.3- 0.0 030421 360 1.6+ 0.6- 030228 704 1.3- 0.8+ 030323 673 0.0 0.3+ 030421 360 1.0+ 1.2- 030228 704 1.6- 0.2+ 030323 673 0.2- 0.0 030502 360 0.5+ 0.2- 030228 704 1.4- 0.6+ 030323 673 0.4- 0.1+ 030502 360 0.1- 0.3+ 030310 644 0.1+ 0.3- 030323 673 0.5- 0.3+ 030505 J95 0.1- 0.1+ 030310 644 0.2- 0.4- 030323 246 0.1+ 0.0 030505 J95 0.6- 0.3+ 030310 644 0.5- 0.1+ 030323 246 0.2+ 0.3- 030505 J95 0.6- 0.1+ 030311 649 0.4- 0.2- 030323 246 0.0 0.2- 030506 118 0.7+ 0.3+ 030311 649 0.3- 0.2- 030323 246 0.2+ 0.2- 030506 118 0.6+ 0.7+ 030311 926 0.6- 0.1+ 030323 246 0.1+ 0.4- 030506 118 1.2+ 1.0+ 030311 670 0.1+ 0.3+ 030323 246 0.2+ 0.2- 030506 118 0.9+ 0.5+ 030311 448 0.0 0.0 030323 246 0.1+ 0.6- 030507 118 0.9+ 0.8- 030311 448 0.8- 0.4+ 030325 372 0.1- 0.8- 030507 118 1.0+ 1.3+ 030311 926 0.4- 0.3- 030326 691 0.1- 0.0 030507 118 1.2+ 1.6+ 030311 448 0.7- 0.1- 030326 691 0.1- 0.1- 030507 118 0.9+ 1.1+ 030311 448 0.7- 0.2- 030326 691 0.4- 0.1+ 030523 360 0.1+ 0.6+ 030311 926 0.4- 0.0 030326 372 0.5- 0.1- 030523 360 0.0 1.0+ 030311 649 0.7- 0.3- 030326 360 0.4- 0.8- 030528 620 0.1+ 0.4- 030311 670 0.4- 1.4+ 030326 360 0.0 0.7- 030528 620 1.4+ 0.2- 030311 644 0.2- 0.2+ 030326 360 0.2- 0.4- 030605 360 0.1- 0.6+ 030311 644 0.0 0.4+ 030329 360 0.0 0.6- 030605 360 0.1- 0.1- 030311 644 0.0 0.2+ 030329 360 0.2- 0.4- 030625 448 (4.0- 3.4+) 030312 850 1.3- 0.4- 030329 360 0.2- 0.3- 030625 448 1.6- 1.3+ 030312 850 0.3- 0.0 030401 704 1.2+ 1.1+ 030625 448 1.1- 1.0+ 030312 850 0.8- 0.7- 030401 704 1.7+ 1.9+ 030626 448 0.3- 0.5- 030312 670 0.1- 0.1+ 030401 704 0.8- 0.9+ 030626 448 0.5+ 0.7- 030312 854 0.2+ 0.2+ 030404 246 0.1+ 0.3- 030626 448 1.2+ 0.1+ 030312 854 0.5+ 0.8- 030404 246 0.8+ 0.6- 2009/ 030312 854 1.2+ 0.0 030404 246 1.0+ 0.4- 091211 H36 0.0 0.0 030312 670 0.8- 0.2- 030404 246 1.0+ 0.6- 091211 H36 0.1+ 0.2- 030312 673 0.3- 0.5+ 030404 246 0.7+ 0.1- 091211 H36 0.8- 0.5- 030312 673 0.1- 0.5+ 030404 246 0.5+ 0.5- 091215 H36 0.7+ 0.0 030312 673 0.3- 0.5+ 030404 170 0.5+ 0.3+ 091215 H36 0.7- 0.1- 030312 673 0.4- 0.1- 030404 170 0.7+ 0.1- 091215 H36 1.4+ 0.0 030313 J95 0.9- 0.4+ 030405 170 0.7+ 0.1- 091216 H36 1.6- 0.0 030313 J95 0.4- 0.3- 030405 170 0.8+ 0.3- 091216 H36 0.9+ 0.6+ 030320 204 0.2- 0.2+ 030406 J95 0.3+ 0.9- 030320 204 0.8- 0.5- 030407 J95 0.4+ 0.4- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2009 Dec. 18