Nakano Note (Nakano wa Kangaeru noda) NK 2344 P/Gehrels (1997 C1 = 2012 S5)

The following improved orbital elements, by S. Nakano, are from 161 observations 1997 to 2012. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.67 arc second. The delta-T correction for the prediction in NK 1148 (= HICQ 2010 /2011) was -0.69 day for the 2012 Sept. 25 observations with the residuals of +440" (R. A.) and +125" (Decl.). Epoch = 2013 July 7.0 TT T = 2013 July 7.99798 +/- 0.02096 (m.e.) TT Peri. = 210.94003 +/- 0.00192 Node = 225.28464 +/- 0.00104 (2000.0) Inc. = 2.85498 +/- 0.00001 q = 3.6016750 +/- 0.0000800 AU e = 0.4749493 +/- 0.0000103 a = 6.8596710 +/- 0.0000296 AU n' = 0.05485916 +/- 0.00000036 P = 17.966 +/- 0.0001163 years (+/- 0.04 day) T = 1996 Jan. 29.20516 TT Epoch = 1996 Feb. 7.0 TT Peri. = 211.35050 e = 0.4688075 Node = 225.91547 (2000.0) a = 6.7117525 AU Inc. = 2.86790 n'= 0.05668265 q = 3.5652323 AU P = 17.388 years The predicted orbit for the 2030 return is as follows: T = 2030 Aug. 18.02376 TT Epoch = 2030 Aug. 7.0 TT Peri. = 209.96162 e = 0.4691352 Node = 222.90882 (2000.0) a = 6.6480357 AU Inc. = 2.92559 n'= 0.05749950 q = 3.5292078 AU P = 17.141 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1997/ 970205 402 0.3+ 0.0 970301 360 0.2+ 0.5+ 970201 691 (2.6- 0.0 ) 970205 402 0.9+ 0.9- 970301 360 0.5- 0.2+ 970201 691 1.8- 0.3- 970205 402 0.5+ 0.5- 970302 046 1.5- 0.6+ 970201 691 1.8- 0.3- 970206 683 0.6+ 0.6+ 970302 046 1.4- 0.6+ 970202 046 0.7- 0.1- 970206 683 0.8+ 0.6+ 970303 557 0.1+ 0.3+ 970202 046 0.4- 0.4- 970206 683 0.7+ 0.6+ 970303 557 0.1+ 0.1+ 970202 046 0.4+ 0.3- 970206 385 0.2- 0.5+ 970305 360 0.8+ 0.0 970202 046 0.2- 0.2+ 970206 385 0.0 0.1+ 970305 360 0.3+ 0.1- 970202 046 1.0- 0.1- 970206 596 0.1+ 0.4- 970305 360 0.6+ 0.0 970202 046 0.5+ 0.3- 970206 596 0.6+ 1.1+ 970305 402 0.3+ 0.9+ 970202 046 0.4+ 0.6- 970206 596 0.8+ 0.4+ 970305 402 1.1+ 0.3- 970202 046 1.0- 0.2- 970206 596 1.4+ 0.4+ 970305 867 0.5+ 0.1+ 970202 709 0.1+ 0.7- 970206 046 0.7+ 0.3+ 970305 867 0.3+ 0.2+ 970202 709 0.2+ 0.7- 970206 046 0.7+ 0.4+ 970305 867 0.2+ 0.0 970202 709 0.2+ 0.4- 970206 046 1.3+ 0.6+ 970307 360 0.7+ 0.4- 970202 709 0.5+ 0.5- 970207 683 0.2+ 1.2+ 970307 360 0.7+ 0.1- 970202 709 0.2+ 0.4- 970207 683 0.1+ 1.1+ 970307 360 1.0+ 0.4- 970202 709 0.2+ 0.5- 970207 683 0.5+ 0.8+ 970311 402 0.3+ 0.1- 970202 709 0.5+ 0.4- 970207 691 (2.1- 0.1+) 970311 402 1.1+ 0.3+ 970202 367 0.4- 0.0 970207 691 1.6- 0.1+ 970311 402 0.2- 1.0+ 970202 367 1.4- 1.3- 970207 691 1.7- 0.3+ 970315 691 1.1+ 0.2- 970202 327 (2.5- 1.6-) 970207 596 (2.9+ 1.0+) 970315 691 1.0+ 0.1- 970202 327 (1.9- 2.0-) 970207 596 0.4- 1.1+ 970315 691 0.8+ 0.3- 970202 327 (1.3- 2.3-) 970207 596 0.9+ 0.7- 970330 587 0.5- 1.0+ 970202 327 1.8- 1.2- 970209 360 0.8+ 0.1+ 970330 587 0.1- 1.5+ 970202 046 0.2+ 0.1- 970209 360 0.8+ 0.2+ 970331 360 0.3+ 0.0 970202 046 0.5- 0.1+ 970209 360 0.8+ 0.3+ 970331 360 0.0 0.1+ 970202 046 1.0+ 0.4- 970209 402 0.3+ 0.3+ 970331 360 0.5- 0.5- 970202 540 (2.9- 1.5+) 970209 402 0.1+ 0.3+ 970331 867 0.3- 0.5- 970202 540 1.5- 0.0 970210 046 0.1- 0.9+ 970331 867 0.6- 0.2+ 970202 540 0.6- 0.3+ 970210 046 0.1+ 0.4+ 970331 867 0.8- 0.3+ 970202 966 1.1- 0.0 970210 046 0.3- 0.3+ 970401 587 0.9- 0.6+ 970202 966 (2.3- 2.5+) 970211 691 0.3+ 0.3- 970501 691 0.5+ 0.8- 970203 966 1.1- 0.6+ 970211 691 0.4+ 0.0 970501 691 0.6+ 0.3- 970203 966 (0.7+ 2.0+) 970211 691 0.3+ 0.0 970504 360 1.6+ 0.3- 970203 118 0.4- 0.2- 970211 385 0.8- 0.9+ 970504 360 1.7+ 0.9- 970203 691 0.8+ 0.9- 970211 385 1.7- 0.1+ 970504 360 0.4+ 0.8- 970203 691 0.9+ 1.0- 970211 897 1.1- 0.5- 970607 691 0.4- 0.2+ 970203 691 0.6+ 1.3- 970211 897 0.2- 1.2+ 970607 691 0.1- 0.0 970203 897 0.8- 1.4+ 970211 897 1.0- 0.2+ 970607 691 0.9+ 0.6- 970203 897 0.5+ 0.4- 970213 402 0.6+ 0.3+ 970614 691 0.4+ 0.1+ 970203 897 0.4- 0.2+ 970213 402 0.2- 1.2+ 970614 691 (2.3+ 0.3-) 970203 355 0.3+ 0.7+ 970215 691 0.0 0.6- 970614 691 0.2+ 1.0- 970203 355 0.6- 0.9- 970215 691 0.0 0.6- 971231 691 1.0+ 0.2- 970203 557 0.2+ 0.2- 970215 691 0.2- 0.8- 971231 691 1.2- 0.5- 970203 557 0.1- 0.5- 970223 658 0.8- 0.4- 971231 691 1.4+ 0.3+ 970203 557 0.3- 0.6- 970223 658 0.2- 1.3- 1998/ 970203 557 0.1+ 0.3- 970223 658 0.2- 0.1- 980202 691 1.6- 0.3- 970204 897 1.3- 0.7+ 970224 658 0.3- 0.2+ 980202 691 1.3- 1.8- 970204 897 0.4+ 0.9+ 970224 658 0.5- 0.3- 980202 691 0.0 0.6- 970204 327 1.1+ 0.4+ 970224 658 0.0 0.3- 2012/ 970204 327 0.5- 0.1+ 970224 360 0.0 0.7- 120925 G96 0.3+ 0.6- 970204 327 0.6- 0.0 970224 360 0.5+ 0.0 120925 G96 0.2+ 0.3- 970204 327 0.3+ 0.3+ 970224 360 0.3- 0.2- 120925 G96 0.2+ 0.3- 970204 897 1.5- 0.1+ 970301 402 0.0 0.2+ 120925 G96 0.2+ 0.4- 970204 360 0.4+ 0.2- 970301 402 0.4- 1.6+ 121008 691 0.0 0.0 970204 360 0.6+ 0.8- 970301 402 0.4- 0.3- 121008 691 0.1- 0.1- 970204 360 0.5+ 0.1- 970301 360 0.1- 0.5+ 121008 691 0.2- 0.2- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Oct. 10

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