Nakano Note (Nakano wa Kangaeru noda) NK 2720 227P/Catalina-LINEAR

The following improved orbital elements, by T. Kobayashi, are from 106 observations 1997 to 2011. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.53 arc second. See the previous orbits in NK 1226 and NK 1852 (= HICQ 2010). Epoch = 2010 Sept. 1.0 TT T = 2010 Sept. 3.69801 +/- 0.00028 (m.e.) TT Peri. = 90.13414 +/- 0.00019 Node = 49.88420 +/- 0.00012 (2000.0) Inc. = 6.52468 +/- 0.00002 q = 1.7948035 +/- 0.0000006 AU e = 0.5000173 +/- 0.0000002 a = 3.5897309 +/- 0.0000018 AU n' = 0.14491430 +/- 0.00000011 P = 6.801 +/- 0.0000050 years T = 1997 Jan. 30.74459 TT Epoch = 1997 Feb. 1.0 TT Peri. = 90.27576 e = 0.4987336 Node = 49.93381 (2000.0) a = 3.5963017 AU Inc. = 6.51968 n'= 0.14451732 q = 1.8027052 AU P = 6.820 years T = 2003 Nov. 19.89599 TT Epoch = 2003 Nov. 17.0 TT Peri. = 90.23372 e = 0.5002810 Node = 49.90236 (2000.0) a = 3.5887016 AU Inc. = 6.52312 n'= 0.14497665 q = 1.7933424 AU P = 6.798 years The predicted orbit for the 2017 return is as follows: T = 2017 June 22.17645 TT Epoch = 2017 June 16.0 TT Peri. = 90.26083 e = 0.5011281 Node = 49.80028 (2000.0) a = 3.5839293 AU Inc. = 6.52707 n'= 0.14526632 q = 1.7879215 AU P = 6.785 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1997/ 040414 696 0.1- 0.3- 090921 291 0.4- 0.1+ 970115 566 (3.0- 0.6+) 040414 691 0.0 0.0 090921 291 0.1- 0.1+ 970115 566 1.4- 1.2- 040416 785 (1.8+ 0.0 ) 090923 291 0.5- 0.2+ 970115 566 0.3- 0.4+ 040416 704 0.4+ 0.6+ 090923 291 0.9- 1.1+ 970115 566 0.5- 0.8- 040416 704 0.8+ 0.6+ 090923 291 0.1- 1.1+ 970115 566 0.8+ 0.7+ 040416 785 (1.9- 1.6+) 090928 291 0.5- 0.2- 970115 566 0.3- 0.1- 040416 704 0.2+ 0.3- 090928 291 0.3- 0.1- 2003/ 040416 704 0.8+ 0.4+ 090928 291 0.3- 0.3- 031228 704 (0.6+ 1.7+) 040416 704 0.0 0.5+ 091018 204 0.4- 0.4- 031228 704 0.4+ 1.1+ 040417 699 0.0 1.1- 091021 215 (1.7+ 0.7+) 031228 704 0.0 0.5+ 040417 699 (1.8- 0.5-) 091023 A13 0.3+ 0.7+ 031228 704 0.6+ 0.8+ 040417 699 (0.6- 2.0+) 091023 A13 0.5+ 0.5+ 2004/ 040417 699 0.1+ 0.4+ 091119 G96 0.3- 0.2+ 040123 704 1.3+ 0.2- 040420 703 1.4+ 0.8- 091119 G96 0.1- 0.3+ 040123 704 0.3- 0.4+ 040420 703 0.4- 1.0+ 091119 G96 0.0 0.1+ 040123 704 0.1+ 1.1+ 040420 703 0.4- 0.3+ 2010/ 040123 704 1.0+ 0.5- 040420 703 (0.5- 1.6+) 100116 C51 0.6+ 0.5+ 040123 699 0.8- 0.4+ 040420 360 0.1- 0.2- 100117 C51 (0.6+ 1.6+) 040123 699 1.1- 0.1+ 040420 360 0.0 0.4- 100117 C51 0.5+ 0.5+ 040123 699 0.0 0.3+ 040420 360 0.3+ 0.2- 100117 C51 0.4+ 1.0+ 040123 699 (1.6- 0.4+) 040420 204 0.0 0.2- 100117 C51 0.6+ 0.2+ 040314 703 0.2- 0.1- 040420 204 0.3- 0.1+ 100117 C51 (1.9+ 0.1+) 040314 703 (0.6- 1.8-) 040422 704 0.2+ 0.1+ 100117 C51 0.0 0.1- 040314 703 0.0 0.1+ 040422 704 (1.5+ 1.0+) 2011/ 040314 703 0.4- 0.2+ 040422 704 0.2- 0.4+ 110310 G96 0.0 0.2- 040316 704 0.7+ 1.0- 040422 704 0.9+ 0.8- 110310 G96 0.1- 0.2- 040316 704 0.1- 0.4+ 040423 213 0.7+ 0.5+ 110310 G96 0.2- 0.3- 040316 704 0.2+ 0.6+ 040424 170 0.7- 0.5- 110509 G96 0.4- 0.2+ 040322 704 0.5+ 0.5- 040424 170 0.0 0.9- 110509 G96 0.1- 0.3+ 040322 704 0.3+ 0.0 040424 170 0.2- 0.9- 110509 G96 0.3- 0.1- 040322 704 0.6+ 0.9- 040425 372 0.1- 0.5- 110509 G96 0.5- 0.1+ 040322 704 0.3+ 0.0 040512 699 (0.9- 2.2+) 110524 G96 0.1- 0.2+ 040325 699 0.8- 0.3- 040512 699 1.2- 0.8- 110524 G96 0.1- 0.5+ 040325 699 (2.6- 0.5+) 040512 699 (1.9- 0.7+) 110524 G96 0.0 0.8+ 040325 699 0.2+ 0.7+ 040512 699 0.1- 0.5- 110524 G96 0.6- 0.4+ 040325 699 0.6- 0.9- 040514 360 0.3+ 0.1+ 110525 G96 0.5- 0.5+ 040409 E12 0.0 1.4+ 040514 360 1.0+ 0.3- 110525 G96 0.1- 0.7+ 040409 E12 0.3+ 1.2+ 040514 360 0.4- 0.2+ 110525 G96 0.6- 0.4+ 040409 E12 0.3- 0.4+ 040519 691 0.0 0.2+ 110525 G96 0.8- 0.5+ 040409 E12 0.5+ 1.0+ 040519 691 0.1+ 0.1+ 110531 H06 0.9+ 0.0 040414 691 0.3- 0.2- 040519 691 0.1+ 0.2+ 110531 H06 0.5+ 0.1- 040414 691 0.2- 0.1- 2009/ 110531 H06 0.5+ 0.5- 040414 696 0.2+ 0.2- 090921 291 0.6- 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2014 June 9

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