Nakano Note (Nakano wa Kangaeru noda) NK 2276 262P/McNaught-Russell (1994 X1 = 2012 K7)

The following improved orbital elements, by S. Nakano, are from 130 observations 1994 to 2012. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.69 arc second. The delta-T correction for the prediction in NK 1147 (= HICQ 2011/2012 = HICQ 2012) was -0.085 day with RunOff values +99" (R. A.) and +30" (Decl.). Epoch = 2012 Dec. 19.0 TT T = 2012 Dec. 4.48062 +/- 0.00183 (m.e.) TT Peri. = 171.19317 +/- 0.00046 Node = 218.01175 +/- 0.00037 (2000.0) Inc. = 29.07902 +/- 0.00004 q = 1.2799178 +/- 0.0000070 AU e = 0.8153767 +/- 0.0000010 a = 6.9325923 +/- 0.0000076 AU n' = 0.05399587 +/- 0.00000009 P = 18.253 +/- 0.0000301 years T = 1994 Sept. 7.94711 TT Epoch = 1994 Sept. 5.0 TT Peri. = 171.14753 e = 0.8157142 Node = 218.00945 (2000.0) a = 6.9287406 AU Inc. = 29.07422 n'= 0.05404091 q = 1.2768687 AU P = 18.238 years The predicted orbit for the 2030 return is as follows: T = 2030 Dec. 15.88892 TT Epoch = 2030 Dec. 5.0 TT Peri. = 171.07742 e = 0.8156575 Node = 217.82699 (2000.0) a = 6.8861209 AU Inc. = 29.18968 n'= 0.05454339 q = 1.2694049 AU P = 18.070 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1994/ 941221 413 0.4- 0.0 950108 372 (3.7+ 1.4-) 941013 607 (2.4+ 8.6+) 941221 413 0.3- 0.2- 950108 372 (4.6+ 1.3-) 941013 607 (5.3+ 0.7+) 941221 413 0.1- 0.5+ 950112 413 0.0 0.4- 941212 413 (1.4- 2.7-) 941221 413 0.1+ 0.6+ 950112 413 0.1- 0.6- 941212 413 1.9+ 0.4+ 941222 413 0.2- 0.0 950112 413 0.0 0.4- 941214 422 0.8+ 0.1+ 941222 413 0.2- 0.1- 950113 413 0.7+ 0.7+ 941214 422 (2.8+ 0.7+) 941222 896 0.7- 0.7- 950113 413 0.6+ 0.1- 941214 897 1.2- 1.2+ 941223 360 0.2+ 0.4- 950113 413 0.0 0.2+ 941214 897 1.6- 0.9- 941223 360 0.0 0.1+ 950114 413 0.0 0.2- 941214 897 1.4- 1.5+ 941223 360 0.1- 0.4+ 950114 413 0.3+ 0.6- 941214 897 0.2- 1.1+ 941223 864 0.4- 0.4- 950115 413 0.1- 0.7- 941214 887 1.0+ 1.3- 941223 864 0.0 1.0- 950115 413 0.2+ 0.5- 941214 887 1.0+ 0.5+ 941223 864 0.3+ 0.1+ 950124 897 1.1+ 1.7+ 941215 557 0.6+ 0.0 941224 897 0.7- 1.6+ 950124 897 (2.5+ 3.7+) 941215 557 0.7+ 0.2+ 941224 897 1.5- 1.0- 950124 897 (2.2+ 4.3+) 941215 557 0.5+ 0.8+ 941224 897 1.2+ 0.7+ 950124 897 (2.6+ 3.1+) 941215 557 1.2+ 1.2+ 941224 897 0.6+ 0.8+ 950125 372 0.3+ 0.9+ 941215 897 1.8+ 0.4- 941226 292 (2.7+ 2.3+) 950126 360 0.7+ 0.5+ 941215 897 0.2- 0.3- 941226 292 (0.9+ 3.3+) 950126 360 0.2- 1.3+ 941215 897 (2.0+ 1.6+) 941227 360 0.2- 0.2- 950129 691 0.5- 0.5- 941215 540 0.2+ 1.5+ 941227 360 0.4+ 1.0+ 950129 691 0.4- 0.1- 941215 540 0.2+ 0.9+ 941227 360 0.0 0.5- 950131 372 (3.8- 7.9+) 941215 540 0.7+ 1.2+ 941228 897 1.6- 0.6- 950201 413 0.0 0.1+ 941216 864 0.1- 0.5- 941228 474 0.2+ 0.3- 950201 413 0.0 0.1- 941216 864 0.0 0.2- 941228 897 0.2- 1.3+ 950201 104 0.1+ 0.3- 941216 864 0.0 0.5- 941228 474 1.0- 0.2+ 950201 104 0.2+ 0.9+ 941218 413 0.4- 1.1- 941229 897 0.5- 0.9- 950201 104 0.5+ 0.0 941218 413 0.1- 0.6- 941229 372 0.2+ 1.1- 950202 413 0.0 0.2- 941218 413 0.4- 0.8- 941229 897 0.2- 0.3+ 950202 413 0.0 0.8- 941218 413 0.5- 0.3- 941229 887 0.5- 1.2+ 950209 413 0.3+ 0.1- 941218 413 0.4- 0.3- 941229 887 0.2+ 1.0+ 950209 413 0.3+ 0.2- 941218 897 (0.9- 2.1+) 941229 887 0.5+ 0.0 950220 413 0.8- 0.3- 941218 897 0.3+ 0.9- 941231 693 (2.1- 0.1-) 950220 413 1.0- 0.3- 941218 897 (2.5- 0.4-) 941231 693 1.7- 0.1- 950221 413 1.0- 0.7- 941218 897 0.2- 1.0+ 941231 693 0.9+ 0.1- 950224 360 (2.3- 0.3+) 941218 897 (1.7- 2.4+) 941231 693 0.6- 0.2+ 950224 360 0.9- 0.8+ 941218 897 1.5+ 0.5+ 1995/ 950224 360 0.4- 0.2+ 941218 413 0.8- 0.7- 950101 864 0.0 0.5- 950307 413 0.2+ 0.7+ 941218 413 0.5- 0.5- 950101 864 0.5- 0.0 950307 413 0.4+ 0.8+ 941219 413 0.0 0.6- 950102 372 0.2+ 0.2+ 950321 413 0.1- 1.0- 941219 413 0.5- 0.6- 950102 887 0.3+ 1.8+ 950321 413 0.0 0.1- 941219 413 0.5- 0.7- 950102 372 1.4+ 1.7- 950322 413 0.1+ 0.3- 941219 413 0.3- 0.6- 950102 887 1.5+ 0.6+ 950417 413 0.7- 0.0 941219 413 0.5- 0.7- 950104 474 0.4+ 0.9- 2012/ 941219 413 0.2- 0.2- 950104 474 0.8- 0.5- 120529 F65 0.5- 0.1- 941219 413 0.6- 0.4+ 950104 372 0.8+ 0.3- 120529 F65 0.3- 0.7- 941220 413 0.8- 0.4- 950105 897 (2.0+ 1.0-) 120529 F65 0.3- 0.4+ 941220 413 0.4- 0.5- 950105 897 1.0+ 0.3- 120530 H06 0.4+ 0.1- 941220 413 0.6- 0.5- 950105 897 0.7+ 1.6+ 120530 H06 0.4+ 0.0 941220 413 0.5- 0.6- 950106 372 0.0 0.1- 120530 H06 0.6+ 0.3- 941220 413 0.5- 0.5- 950106 372 1.5+ 0.1- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 May 8

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