Nakano Note (Nakano wa Kangaeru noda) NK 2503 147P/Kushida-Muramatsu

The following improved orbital elements, by T. Kobayashi, are from 76 observations 1994 to 2009, excepting all observations made between 1993 - 1994 May. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta and non-gravitational effects of sublimating molecule = CO (or N2) using Yabushita's theory (MN 283, 347) were taken into account. The mean residual is +/- 1.30 arc seconds. See the previous orbits in NK 675, NK 910, NK 1743 (= HICQ 2008/2009). Epoch = 2008 Sept.11.0 TT T = 2008 Sept.22.93958 +/- 0.02331 (m.e.) TT Peri. = 346.87148 +/- 0.00405 Node = 93.75111 +/- 0.00101 (2000.0) Inc. = 2.36764 +/- 0.00004 q = 2.7564090 +/- 0.0000189 AU e = 0.2759009 +/- 0.0000101 a = 3.8066734 +/- 0.0000592 AU n' = 0.13270450 +/- 0.00000311 P = 7.427 +/- 0.0001731 years Y1 = -0.322 +/- 0.000 Y2 = -0.03070 +/- 0.00000 (+/- 0.06 day) T = 2001 Apr. 29.50691 TT Epoch = 2001 May 11.0 TT Peri. = 347.49624 e = 0.2774727 Node = 93.75555 (2000.0) a = 3.8094473 AU Inc. = 2.36834 n'= 0.13255958 q = 2.7524297 AU P = 7.435 years The predicted orbit for the 2016 return is as follows: T = 2016 Feb. 27.84741 TT Epoch = 2016 Feb. 22.0 TT Peri. = 347.09359 e = 0.2772183 Node = 93.71823 (2000.0) a = 3.7999337 AU Inc. = 2.36807 n'= 0.13305771 q = 2.7465223 AU P = 7.407 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1994/ 991113 695 1.1- 0.8+ 070919 705 (6.2- 7.2-) 941208 691 0.9- 0.0 2000/ 2008/ 941208 691 1.4- 0.0 000926 867 0.0 1.9+ 081221 691 0.7- 2.3- 941209 691 0.4- 0.3+ 000926 867 0.8- 1.3+ 081221 691 0.2- 1.8- 941209 691 1.7- 0.3+ 000926 867 0.1- 1.1+ 081221 691 (0.5- 2.5-) 941209 691 0.7- 0.6- 001003 867 0.6- 2.3+ 081222 461 0.1+ 1.6- 1995/ 001003 867 (0.6+ 3.0+) 081222 461 0.1- 2.3- 950113 413 0.8- 1.9- 001003 867 0.4- 1.7+ 081222 461 0.2+ 2.4- 950113 413 1.1- 1.7- 001003 867 (2.0- 4.0+) 081223 461 0.0 2.4- 950131 691 0.5- 2.1- 001004 867 0.1+ 0.9+ 081223 461 0.7+ 1.5- 950201 691 0.5- 1.8- 001004 867 2.0- 1.7+ 081223 461 0.4+ 2.0- 950210 360 0.7- 1.8- 001004 867 (0.3- 3.4+) 081224 461 0.6+ 1.5- 950210 360 0.4- 1.9- 001004 867 1.7- 1.3+ 081224 461 0.2- 2.1- 950210 360 0.5- 2.0- 001008 809 0.1+ 1.8+ 081224 461 0.1- 2.0- 950227 360 (0.4- 2.6-) 001008 809 0.2+ 1.7+ 081228 349 0.6- 1.4- 950227 360 0.5- 2.2- 001008 809 0.1+ 1.5+ 081228 349 0.5- 1.9- 950227 360 0.8- 2.0- 2001/ 081228 349 1.0- 1.2- 950307 587 1.9- 2.4- 011214 691 1.5+ 1.2+ 081229 691 0.2- 2.4- 950307 587 (0.5- 2.8-) 011214 691 2.2+ 0.6+ 081229 691 0.7- 2.4- 950321 413 0.2- 2.3- 011214 691 1.4+ 2.3+ 081229 691 0.7- 2.1- 950321 413 0.1- 2.2- 2002/ 081230 704 (0.5- 3.2-) 950402 693 0.3- 1.7- 020208 691 0.5+ 1.5+ 081230 704 (1.2- 3.4-) 950402 693 0.4- 1.8- 020208 691 0.2+ 0.9+ 081230 704 (1.4- 3.1-) 950402 693 0.3- 1.9- 020208 691 0.1+ 1.2+ 081230 704 (2.2- 4.6-) 950403 360 (0.3+ 3.0-) 020215 360 0.8+ 1.1+ 2009/ 950403 360 (0.7- 3.7-) 020215 360 0.4+ 1.5+ 090102 349 (0.2- 2.9-) 950403 360 (0.4- 3.3-) 020215 360 0.5+ 1.5+ 090102 349 0.7- 2.1- 950622 691 (0.2+ 3.6-) 020320 691 0.9+ 2.2+ 090107 691 0.6- 1.6- 950622 691 (0.3+ 3.3-) 020320 691 (0.4- 2.6+) 090107 691 1.2- 2.1- 950623 691 (0.6- 3.2-) 020320 691 0.9+ 1.6+ 090107 691 0.4- 1.0- 950623 691 (0.8- 3.9-) 2007/ 090125 215 1.4+ 2.1- 1999/ 070905 705 (5.8- 6.7-) 090130 204 0.5+ 0.6- 990913 695 0.4- 1.1+ 070905 705 (5.6- 7.1-) 090130 204 0.6- 0.7- 990913 695 0.1- 1.1+ 070914 705 (5.7- 6.7-) 090217 204 1.0+ 1.3- 990913 695 0.7- 1.0+ 070914 705 (5.5- 7.1-) 090221 204 0.5+ 0.4- 991113 695 0.4- 1.2+ 070919 705 (6.2- 7.2-) 090222 204 0.0 0.4- 991113 695 0.6- 2.0+ 070919 705 (6.0- 7.3-) 090228 215 0.7- 0.3- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2013 June 12

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