Nakano Note (Nakano wa Kangaeru noda) NK 2845 P/Catalina-McNaught (2008 S1 = 2015 G1)
The following improved orbital elements, by S. Nakano, are from 87 observations 2008 to 2015. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.63 arc second. The residuals of recovery observations were +300" and -57" from the prediction in NK 2310 (= HICQ 2014) with the delta-T correction = -0.11 day. Epoch = 2015 June 27.0 TT T = 2015 July 1.75524 +/- 0.00009 (m.e.) TT Peri. = 203.66497 +/- 0.00009 Node = 111.36385 +/- 0.00008 (2000.0) Inc. = 15.07376 +/- 0.00002 q = 1.1967312 +/- 0.0000006 AU e = 0.6652765 +/- 0.0000002 a = 3.5752832 +/- 0.0000007 AU n' = 0.14579358 +/- 0.00000004 P = 6.760 +/- 0.0000019 years T = 2008 Oct. 1.82959 TT Epoch = 2008 Oct. 21.0 TT Peri. = 203.63116 e = 0.6663986 Node = 111.39024 (2000.0) a = 3.5678417 AU Inc. = 15.10160 n'= 0.14624994 q = 1.1902368 AU P = 6.739 years The predicted orbit for the 2022 return is as follows: T = 2022 Mar. 31.43223 TT Epoch = 2022 Apr. 11.0 TT Peri. = 203.67724 e = 0.6666648 Node = 111.37039 (2000.0) a = 3.5669121 AU Inc. = 15.09478 n'= 0.14630712 q = 1.1889775 AU P = 6.737 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2008/ 080920 423 0.2+ 0.5- 081121 E85 1.0+ 1.6+ 080502 703 0.2- 0.4- 080920 E12 0.1- 0.1+ 081121 E85 (2.0+ 0.2-) 080502 703 1.1+ 1.5+ 080920 E12 0.0 0.0 081123 J24 1.3- 0.5+ 080502 703 0.2- 1.6+ 080920 423 0.5+ 0.2+ 081123 J24 0.5+ 0.4+ 080502 703 0.6+ 0.2+ 080921 F84 0.6+ 0.7+ 081127 E85 1.1- 1.2+ 080502 703 0.6- 0.1- 080921 F84 0.3+ 0.1+ 081127 E85 0.0 1.7- 080502 703 0.3- 0.2+ 080921 F84 0.8- 0.2+ 081127 E85 0.5+ 1.6+ 080502 703 0.0 0.7+ 080921 E12 0.1+ 0.0 081219 204 0.2- 1.3+ 080502 703 0.1- 0.3+ 080921 423 0.5+ 0.2+ 081224 204 0.2+ 0.1- 080502 J95 0.4+ 0.3+ 080921 423 0.4+ 0.2- 081224 204 0.1+ 0.5- 080502 J95 0.3+ 0.1+ 080922 E85 0.2+ 0.6- 081226 474 0.5+ 1.7+ 080502 J95 1.1+ 0.6- 080922 E85 1.3- 0.4+ 081226 474 (2.2- 0.6+) 080917 E12 0.2- 1.0+ 080922 E85 0.3- 0.1- 2009/ 080917 E12 0.0 0.6+ 080922 467 0.1+ 0.5- 090102 204 0.9- 0.1+ 080917 E12 0.6+ 0.2- 080922 467 0.3- 0.7- 090102 204 0.3- 0.2- 080917 E12 0.2- 0.5+ 080922 467 0.3- 0.3- 090104 474 0.7- 1.6- 080918 H55 0.2+ 0.7+ 080924 F84 0.4+ 0.4- 090104 474 0.1- 0.2- 080918 H55 0.1+ 0.6+ 080924 423 0.1- 0.4+ 2015/ 080918 H55 0.4+ 0.7+ 080925 E85 1.1+ 0.7- 150405 C51 0.1- 0.7- 080918 673 0.2+ 0.4- 080925 E85 0.1+ 0.2- 150405 C51 0.0 0.1+ 080918 673 0.3- 0.1+ 080925 E85 0.7- 0.2+ 150406 C51 1.0+ 0.1+ 080918 673 0.5+ 0.3- 080925 467 1.5- 0.7+ 150406 C51 (2.9- 2.2+) 080918 673 0.2+ 0.0 080925 467 (0.6- 2.5+) 150406 C51 0.3- 0.7- 080918 E12 0.0 0.1+ 080925 467 1.7- 0.2+ 150406 C51 0.6- 0.4- 080918 E12 0.0 0.1+ 080926 E85 (0.9+ 4.1+) 150406 C51 0.2+ 0.9- 080918 D90 0.6- 0.5- 080926 E85 (3.7+ 1.0-) 150407 C51 0.1- 0.6- 080918 D90 0.5- 0.4+ 081020 467 0.9+ 0.3- 150407 C51 0.2- 0.0 080918 E12 0.0 0.3- 081020 467 0.2+ 0.6- 150407 C51 0.1- 0.5- 080918 D90 1.6- 0.7- 081020 467 0.1+ 0.0 150407 C51 0.3+ 0.2- 080919 E12 0.1- 0.2+ 081120 E85 (1.2+ 4.2+) 150408 C51 0.7- 0.0 080919 E12 0.0 0.1+ 081120 E85 0.3+ 0.6- 150408 C51 0.0 0.2+ 080919 423 1.0+ 0.3- 081120 E85 1.6+ 0.4+ 150408 C51 0.1+ 0.8- 080919 423 0.6- 0.1+ 081121 E85 (2.9+ 0.1+) ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2015 Apr. 11