Nakano Note (Nakano wa Kangaeru noda) NK 1855 228P/LINEAR (2001 YX127 = 2009 U2)
The following improved orbital elements, by S. Nakano, are from 134 observations 2001 to 2009. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.70 arc second. The delta-T correction is -0.32 day for the prediction in NK 1609. See the previous orbits in NK 880, NK 953 and NK 1609. Epoch = 2011 Aug. 27.0 TT T = 2011 Aug. 23.84213 +/- 0.00138 (m.e.) TT Peri. = 114.79344 +/- 0.00021 Node = 31.06623 +/- 0.00014 (2000.0) Inc. = 7.91542 +/- 0.00002 q = 3.4304747 +/- 0.0000008 AU e = 0.1771925 +/- 0.0000002 a = 4.1692309 +/- 0.0000003 AU n' = 0.11577643 +/- 0.00000001 P = 8.513 +/- 0.0000010 years T = 2003 Mar. 7.12613 TT Epoch = 2003 Mar. 22.0 TT Peri. = 115.89931 e = 0.1792689 Node = 31.12730 (2000.0) a = 4.1744959 AU Inc. = 7.90730 n'= 0.11555747 q = 3.4261387 AU P = 8.529 years The predicted orbit for the 2020 return is as follows: T = 2020 Mar. 10.72132 TT Epoch = 2020 Mar. 12.0 TT Peri. = 115.30349 e = 0.1769356 Node = 30.98890 (2000.0) a = 4.1744639 AU Inc. = 7.90961 n'= 0.11555879 q = 3.4358528 AU P = 8.529 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2001/ 030131 704 0.3- 0.5+ 030523 360 0.8+ 0.5+ 011209 704 (2.2- 1.9+) 030131 704 0.3- 0.9+ 030523 360 0.3+ 0.3+ 011209 704 1.9- 0.8+ 030131 704 0.1+ 0.7+ 2004/ 011209 704 (2.5- 0.0 ) 030202 644 0.1+ 0.2+ 040328 360 1.4- 0.1+ 011217 704 0.8- 1.3- 030202 644 0.1+ 0.6+ 040328 360 1.0- 0.4- 011217 704 0.9- 0.2+ 030202 644 0.2- 0.4+ 040328 360 1.1- 0.0 011217 704 1.0- 0.6+ 030204 699 1.0- 0.6+ 040411 360 0.2- 0.4- 011217 704 0.2- 1.1+ 030204 699 0.7- 0.1+ 040411 360 0.0 0.2- 011222 704 0.2- 1.4+ 030204 699 1.1- 0.0 040411 360 0.2+ 0.0 011222 704 0.6- 0.9- 030204 699 0.6- 0.4+ 040421 291 0.1- 0.6+ 011222 704 0.6- 0.3- 030206 704 0.1- 0.6+ 040421 291 0.6- 1.1+ 011222 704 0.3+ 1.0+ 030206 704 0.7- 1.1+ 040421 291 0.2- 0.7+ 011222 704 0.9- 0.2- 030206 704 1.3- 0.4+ 040430 291 0.1- 0.7+ 2002/ 030206 704 0.1- 0.6+ 040430 291 0.2- 0.5+ 020108 704 0.8+ 0.2- 030206 360 0.3- 0.4- 040430 291 0.4- 0.8+ 020108 704 1.3+ 1.1- 030206 360 0.3+ 0.6- 040513 691 0.9+ 0.3+ 020108 704 0.4- 0.1- 030219 644 0.1+ 0.1- 040513 691 0.8+ 0.4+ 020214 696 0.4+ 0.1- 030219 644 0.4+ 0.2- 040513 691 0.6+ 0.2+ 020214 696 0.5+ 0.2- 030219 644 0.7+ 0.4- 040521 691 1.2+ 0.0 020215 360 0.6+ 0.1+ 030222 204 0.5+ 0.6- 040521 691 0.9+ 0.1+ 020215 867 0.9+ 0.4- 030222 204 0.6- 0.5- 040521 691 0.3+ 0.1+ 020215 360 0.1+ 0.2- 030222 204 0.0 0.5- 040529 691 1.3+ 0.2- 020215 360 0.5+ 0.4- 030222 204 0.3+ 0.5- 040529 691 0.7+ 0.3- 020215 867 2.0+ 0.3- 030223 699 0.7- 0.7- 040529 691 1.0+ 0.0 020304 204 1.3+ 1.6- 030223 699 (2.9- 0.3-) 2009/ 020304 204 1.3+ 0.3- 030223 699 0.6- 1.0- 091018 291 1.0- 0.4+ 021105 204 1.0+ 0.9+ 030223 699 1.3- 0.6- 091018 291 0.6- 0.5+ 021105 204 0.4- 0.0 030225 118 1.1+ 1.9+ 091018 291 0.4- 0.3+ 021213 360 0.4- 0.1+ 030305 704 0.8+ 0.6- 091019 291 0.4- 0.6+ 021213 360 0.8- 1.2+ 030305 704 0.2+ 0.3- 091019 291 0.6- 0.8+ 021213 360 1.2- 0.3+ 030305 704 (2.1+ 0.1-) 091019 291 0.7- 0.3+ 021214 360 0.5- 0.4+ 030305 704 0.9+ 0.6- 091021 850 (2.2+ 1.7-) 021214 360 1.7- 0.6+ 030307 644 0.1- 0.8- 091021 850 1.6+ 0.1- 021214 360 1.1- 0.9+ 030307 644 0.0 1.0- 091021 850 1.3+ 1.3+ 2003/ 030307 644 0.7+ 0.4+ 091024 691 0.6- 0.5+ 030107 360 0.7- 0.0 030308 704 1.4+ 0.4- 091024 691 0.3- 0.5+ 030107 360 0.1+ 0.1- 030308 704 0.9+ 0.1- 091024 691 0.3- 0.9+ 030110 704 0.4- 0.7- 030308 704 1.2+ 0.1+ 091026 204 0.3- 0.1- 030110 704 0.2- 0.9+ 030308 704 0.1+ 0.4- 091029 215 0.1- 0.3- 030110 704 1.2+ 0.8+ 030313 644 0.8+ 0.1+ 091110 G96 0.6- 0.0 030110 704 1.0- 0.9+ 030313 644 0.7+ 0.1+ 091110 G96 0.0 0.2- 030118 644 0.1+ 0.2- 030313 644 1.0+ 0.0 091110 G96 0.2+ 0.2+ 030118 644 0.5- 0.2- 030326 360 1.3+ 0.3+ 091110 G96 0.1- 0.2- 030118 644 0.4+ 0.7+ 030326 360 0.7+ 0.3- 091111 G96 0.4+ 0.7+ 030128 644 0.1- 0.1+ 030501 360 1.5+ 0.3+ 091111 G96 0.3+ 0.3- 030128 644 0.5- 0.2+ 030501 360 1.2+ 0.6- 091111 G96 0.3- 0.6+ 030130 608 0.6+ 1.3- 030501 360 (2.4+ 0.5-) 091111 G96 0.2+ 0.1+ 030130 608 0.7- 1.2- 030512 608 0.9+ 0.7- 030130 608 1.3- 1.3- 030523 360 0.4+ 0.1- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2009 Nov. 20