Nakano Note (Nakano wa Kangaeru noda) NK 1852 227P/Catalina-LINEAR (2004 EW38 = 2009 S4)
The following improved orbital elements, by S. Nakano, are from 87 observations 1997 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 for the prediction in NK 1226 (= HICQ 2009/2010) was +0.096 day. The 1997 observations were found by Maik Meyer. Epoch = 2010 Sept. 1.0 TT T = 2010 Sept. 3.69877 +/- 0.00089 (m.e.) TT Peri. = 90.13424 +/- 0.00027 Node = 49.88421 +/- 0.00020 (2000.0) Inc. = 6.52468 +/- 0.00004 q = 1.7948022 +/- 0.0000008 AU e = 0.5000177 +/- 0.0000003 a = 3.5897314 +/- 0.0000007 AU n' = 0.14491427 +/- 0.00000004 P = 6.801 +/- 0.0000020 years T = 1997 Jan. 30.74492 TT Epoch = 1997 Feb. 1.0 TT Peri. = 90.27587 e = 0.4987341 Node = 49.93383 (2000.0) a = 3.5963021 AU Inc. = 6.51969 n'= 0.14451730 q = 1.8027037 AU P = 6.820 years T = 2003 Nov. 19.89656 TT Epoch = 2003 Nov. 17.0 TT Peri. = 90.23383 e = 0.5002814 Node = 49.90238 (2000.0) a = 3.5887021 AU Inc. = 6.52312 n'= 0.14497662 q = 1.7933411 AU P = 6.798 years The predicted orbit for the 2017 return is as follows: T = 2017 June 22.17745 TT Epoch = 2017 June 16.0 TT Peri. = 90.26093 e = 0.5011285 Node = 49.80030 (2000.0) a = 3.5839298 AU Inc. = 6.52708 n'= 0.14526629 q = 1.7879203 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/ 040325 699 0.8- 0.4- 040420 204 0.3- 0.1+ 970115 566 (2.8- 0.4+) 040325 699 (2.6- 0.4+) 040422 704 0.2+ 0.1+ 970115 566 1.3- 1.4- 040325 699 0.2+ 0.6+ 040422 704 1.5+ 0.9+ 970115 566 0.2- 0.3+ 040325 699 0.5- 1.0- 040422 704 0.2- 0.4+ 970115 566 0.3- 1.0- 040409 E12 0.0 1.3+ 040422 704 0.9+ 0.8- 970115 566 1.0+ 0.5+ 040409 E12 0.3+ 1.1+ 040423 213 0.7+ 0.5+ 970115 566 0.2- 0.3- 040409 E12 0.2- 0.4+ 040424 170 0.7- 0.5- 2003/ 040409 E12 0.5+ 1.0+ 040424 170 0.0 1.0- 031228 704 0.8+ 1.6+ 040414 691 0.2- 0.2- 040424 170 0.2- 0.9- 031228 704 0.6+ 1.0+ 040414 691 0.2- 0.1- 040425 372 0.1- 0.5- 031228 704 0.2+ 0.4+ 040414 696 0.2+ 0.2- 040512 699 (0.9- 2.2+) 031228 704 0.8+ 0.6+ 040414 696 0.1- 0.3- 040512 699 1.3- 0.8- 2004/ 040414 691 0.0 0.1- 040512 699 1.9- 0.7+ 040123 704 1.4+ 0.4- 040416 785 1.8+ 0.1- 040512 699 0.2- 0.5- 040123 704 0.2- 0.2+ 040416 704 0.4+ 0.5+ 040514 360 0.3+ 0.1+ 040123 704 0.2+ 1.0+ 040416 704 0.8+ 0.5+ 040514 360 1.0+ 0.3- 040123 704 1.2+ 0.6- 040416 785 1.8- 1.6+ 040514 360 0.4- 0.2+ 040123 699 0.7- 0.3+ 040416 704 0.3+ 0.3- 040519 691 0.0 0.2+ 040123 699 0.9- 0.0 040416 704 0.8+ 0.4+ 040519 691 0.1+ 0.1+ 040123 699 0.1+ 0.2+ 040416 704 0.0 0.5+ 040519 691 0.1+ 0.2+ 040123 699 1.4- 0.2+ 040417 699 0.0 1.1- 2009/ 040314 703 0.2- 0.2- 040417 699 1.8- 0.5- 090921 291 0.4- 0.4+ 040314 703 0.6- 1.9- 040417 699 0.6- 1.9+ 090921 291 0.2- 0.2+ 040314 703 0.0 0.0 040417 699 0.1+ 0.3+ 090921 291 0.1+ 0.2+ 040314 703 0.4- 0.1+ 040420 703 1.4+ 0.8- 090923 291 0.3- 0.3+ 040316 704 0.7+ 1.1- 040420 703 0.4- 0.9+ 090923 291 0.6- 1.2+ 040316 704 0.1- 0.3+ 040420 703 0.4- 0.3+ 090923 291 0.2+ 1.2+ 040316 704 0.2+ 0.5+ 040420 703 0.5- 1.5+ 090928 291 0.3- 0.1- 040322 704 0.5+ 0.6- 040420 360 0.1- 0.2- 090928 291 0.1- 0.1+ 040322 704 0.3+ 0.1- 040420 360 0.0 0.4- 090928 291 0.0 0.2- 040322 704 0.6+ 1.0- 040420 360 0.3+ 0.3- 040322 704 0.3+ 0.1- 040420 204 0.0 0.2- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2009 Sept. 30