Nakano Note (Nakano wa Kangaeru noda) NK 2552 P/Spacewatch (2006 XG16 = 2013 R2)
The following improved orbital elements, by S. Nakano, are from 87 observations 2006 to 2013. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.46 arc second. Recovery observations show the residuals of -106" (R. A.) and -7" ( Decl.) from the prediction in NK 2062 (= HICQ 2013) with the delta-T correction= +0.096 day. See an orbit on YC 2541. Epoch = 2014 Jan. 23.0 TT T = 2014 Jan. 10.27226 +/- 0.00387 (m.e.) TT Peri. = 41.14777 +/- 0.00151 Node = 78.43683 +/- 0.00015 (2000.0) Inc. = 9.06477 +/- 0.00004 q = 2.1117597 +/- 0.0000040 AU e = 0.4197033 +/- 0.0000011 a = 3.6391036 +/- 0.0000027 AU n' = 0.14197519 +/- 0.00000016 P = 6.942 +/- 0.0000078 years T = 2007 Feb. 9.95966 TT Epoch = 2007 Mar. 1.0 TT Peri. = 41.31107 e = 0.4209841 Node = 78.45371 (2000.0) a = 3.6306630 AU Inc. = 9.07783 n'= 0.14247057 q = 2.1022116 AU P = 6.918 years The predicted orbit for the 2020 return is as follows: T = 2020 Dec. 19.27791 TT Epoch = 2020 Dec. 17.0 TT Peri. = 41.05999 e = 0.4182976 Node = 78.41151 (2000.0) a = 3.6442182 AU Inc. = 9.05654 n'= 0.14167640 q = 2.1198506 AU P = 6.957 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2006/ 070109 704 0.1- 0.5- 070212 372 0.3- 1.4+ 061115 G96 0.7+ 0.6- 070109 704 0.6+ 0.5- 070212 349 0.2- 0.4+ 061115 G96 0.1- 0.5- 070109 704 0.3- 1.0+ 070212 349 0.1+ 0.6+ 061115 G96 0.2- 0.3- 070127 693 0.0 0.1- 070309 644 0.1- 0.1+ 061115 G96 0.0 0.5- 070127 693 0.1- 0.1- 070309 644 0.1- 0.2+ 061210 691 0.0 0.1+ 070127 693 0.9- 0.3+ 070309 644 0.3- 0.1+ 061210 691 0.0 0.0 070128 693 0.1- 0.1+ 070310 704 0.3+ 0.3+ 061210 691 0.1+ 0.2- 070128 693 0.1- 0.1+ 070310 704 0.1+ 0.7- 061212 691 0.2- 0.2- 070128 693 0.2- 0.2+ 070310 704 0.8- 0.9+ 061212 691 0.7- 0.5- 070201 204 0.4+ 0.3- 070310 704 0.2+ 1.5+ 061212 691 0.1+ 0.3- 070201 204 0.1+ 0.3+ 070312 213 0.1+ 0.3- 061215 704 0.3+ 0.1- 070204 349 0.8+ 0.6- 070312 213 0.1+ 0.3- 061215 704 0.2+ 0.2- 070204 349 0.8+ 0.4- 070312 213 0.0 0.2- 061215 704 0.5+ 0.1+ 070205 644 0.1+ 0.1+ 070316 703 0.1+ 1.0- 061215 704 0.1- 0.1- 070205 644 0.3- 0.1+ 070316 703 0.3+ 0.9- 061218 704 0.4+ 0.1+ 070205 644 0.3- 0.1- 070316 703 0.6+ 1.2- 061218 704 0.0 0.5- 070205 104 0.1- 0.2- 070316 703 0.4+ 0.7- 061218 704 0.4+ 0.5+ 070205 104 0.0 0.0 070402 118 1.0- 1.0- 061218 704 0.5- 0.0 070205 104 0.1- 0.3- 070402 118 0.7+ 0.3+ 061218 704 0.9+ 0.6+ 070208 673 0.4- 0.5+ 070414 561 0.2+ 0.6+ 061226 691 0.1- 0.2- 070208 673 0.3- 0.5+ 070414 561 0.9+ 0.5+ 061226 691 0.1- 0.2- 070208 673 0.3- 0.3+ 070414 561 0.9- 0.6+ 061226 691 0.2- 0.3- 070208 673 0.5- 0.3+ 2013/ 2007/ 070209 215 0.4- 1.3- 130914 291 0.1- 0.1+ 070107 644 0.4- 0.2+ 070209 215 0.1+ 1.0- 130914 291 0.1- 0.3+ 070107 644 0.4- 0.0 070209 215 0.5+ 0.8- 130914 291 0.4+ 0.6+ 070107 644 0.2- 0.7+ 070209 213 0.0 0.5- 130915 291 0.0 0.2+ 070107 644 0.1- 0.2- 070209 213 0.1- 0.4+ 130915 291 0.0 0.0 070107 644 0.5+ 0.2+ 070209 213 0.1- 0.3+ 130915 291 0.3- 0.6+ 070107 644 0.2+ 0.1+ 070211 372 0.2+ 0.1+ 070109 704 0.2+ 1.3+ 070212 372 (0.4- 2.3+) ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2013 Sept. 16