Nakano Note (Nakano wa Kangaeru noda) NK 3807 P/Spacewatch (2006 F4 = 2019 D2)

The following improved orbital elements, by S. Nakano, are from 57 observations 2006 to 2019. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.54 arc second. Residuals for the recovery observations were +0.43 deg for Right Ascension and -0.08 deg for Declination from the prediction in NK 1779 and NK 3215 (= HICQ 2019) with the delta-T correction = -0.98 day. Epoch = 2019 July 16.0 TT T = 2019 Aug. 1.55648 +/- 0.00822 (m.e.) TT Peri. = 31.20206 +/- 0.00237 Node = 184.02852 +/- 0.00006 (2000.0) Inc. = 12.38614 +/- 0.00004 q = 2.3335789 +/- 0.0000108 AU e = 0.3380584 +/- 0.0000030 a = 3.5253548 +/- 0.0000228 AU n' = 0.14890176 +/- 0.00000145 P = 6.619 +/- 0.0000643 years T = 2006 May 3.61235 TT Epoch = 2006 Apr. 15.0 TT Peri. = 31.38797 e = 0.3370394 Node = 184.09507 (2000.0) a = 3.5290537 AU Inc. = 12.38476 n'= 0.14866772 q = 2.3396234 AU P = 6.630 years [ T = 2012 Dec. 13.46996 TT Epoch = 2012 Dec. 19.0 TT Peri. = 31.05720 e = 0.3366123 Node = 184.06076 (2000.0) a = 3.5301483 AU Inc. = 12.37876 n'= 0.14859858 q = 2.3418569 AU P = 6.633 years ] The predicted orbit for the 2026 return is as follows: T = 2026 Feb. 22.86888 TT Epoch = 2026 Feb. 9.0 TT Peri. = 31.60747 e = 0.3500056 Node = 183.50917 (2000.0) a = 3.4840824 AU Inc. = 12.42979 n'= 0.15155541 q = 2.2646342 AU P = 6.503 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2006/ 060406 703 0.6- 0.0 060505 G96 0.2+ 0.7- 060326 691 0.5- 0.2+ 060406 703 (2.4- 0.1-) 060505 G96 0.1+ 0.6- 060326 691 0.3- 0.3+ 060409 673 0.6+ 0.3- 060519 213 (3.5+ 0.6-) 060326 691 0.0 0.3+ 060409 673 0.3+ 0.2- 060519 213 1.0- 0.7- 060328 J95 (0.7- 2.1+) 060409 673 (4.1- 6.5+) 060521 215 0.6+ 0.0 060328 J95 1.2- 0.1+ 060409 673 0.7+ 0.1+ 060527 130 (2.3+ 1.1-) 060328 D35 0.5- 1.2+ 060409 673 0.2+ 0.2+ 060531 561 1.3+ 0.3+ 060328 D35 0.5- 1.1+ 060419 703 0.2- 0.6+ 060531 561 1.1+ 0.7+ 060328 D35 0.3- 1.0+ 060419 703 1.4- 0.4+ 060531 561 1.3+ 0.2- 060329 734 0.2- 1.3+ 060419 703 0.9- 1.0- 2019/ 060329 734 1.1- 0.9- 060419 703 0.5- 0.1+ 190228 G96 0.5- 0.5+ 060329 734 (3.5- 2.9-) 060423 204 0.0 0.1- 190228 G96 0.5- 0.6+ 060329 474 0.2+ 0.6+ 060423 204 0.6- 0.4- 190228 G96 0.2+ 0.9+ 060329 474 0.0 0.4+ 060427 703 1.0- 0.8+ 190228 G96 0.5- 0.1+ 060329 474 0.3+ 0.1- 060427 703 0.5- 0.2- 190329 G96 0.1+ 0.1- 060330 850 1.5- 0.3+ 060427 703 0.8- 0.8- 190329 G96 0.2- 0.1- 060330 850 1.8+ 0.6+ 060427 703 0.4- 1.7- 190329 G96 0.2+ 0.1+ 060330 474 0.3+ 0.1+ 060430 213 1.4+ 0.1- 190329 G96 0.0 0.2- 060330 474 0.5+ 0.7- 060430 213 1.2+ 0.2- 190403 F51 0.1+ 0.1- 060330 474 0.3- 0.2+ 060430 213 1.0+ 0.2- 190403 F51 0.0 0.1- 060406 703 1.3+ 1.2+ 060505 G96 0.1+ 0.3- 190403 F51 0.0 0.1- 060406 703 (0.6+ 2.3-) 060505 G96 0.4+ 0.5- 190403 F51 0.0 0.1- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 Apr. 4

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