Nakano Note (Nakano wa Kangaeru noda) NK 2993 P/Hill (2007 V2 = 2015 P1)

The following improved orbital elements, by S. Nakano, are from 72 observations 1990 to 2015. The 1990 observations were found by M. Meyer. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.57 arc second. The residuals of recovery observations were +276" for R. A. and +115" for Decl. from the prediction in NK 1574 (= HICQ 2014) with the delta-T correction = -0.28 day. Epoch = 2015 Oct. 25.0 TT T = 2015 Oct. 22.82248 +/- 0.01800 (m.e.) TT Peri. = 278.87003 +/- 0.00475 Node = 99.81308 +/- 0.00113 (2000.0) Inc. = 2.47048 +/- 0.00003 q = 2.7797452 +/- 0.0000164 AU e = 0.3172925 +/- 0.0000040 a = 4.0716491 +/- 0.0000084 AU n' = 0.11996334 +/- 0.00000037 P = 8.216 +/- 0.0000253 years T = 1991 Mar. 20.90844 TT Epoch = 1991 Mar. 5.0 TT Peri. = 279.60395 e = 0.3190298 Node = 100.01724 (2000.0) a = 4.0599947 AU Inc. = 2.47144 n'= 0.12048025 q = 2.7647356 AU P = 8.181 years [ T = 1999 May 24.14924 TT Epoch = 1999 May 22.0 TT Peri. = 279.07795 e = 0.3179728 Node = 99.91538 (2000.0) a = 4.0816438 AU Inc. = 2.46884 n'= 0.11952298 q = 2.7837921 AU P = 8.246 years ] T = 2007 July 30.92649 TT Epoch = 2007 Aug. 8.0 TT Peri. = 278.53681 e = 0.3176935 Node = 99.86087 (2000.0) a = 4.0670917 AU Inc. = 2.47096 n'= 0.12016504 q = 2.7750031 AU P = 8.202 years The predicted orbit for the 2023 return is as follows: T = 2023 Dec. 30.42564 TT Epoch = 2024 Jan. 11.0 TT Peri. = 278.64680 e = 0.3191342 Node = 99.79697 (2000.0) a = 4.0679982 AU Inc. = 2.47103 n'= 0.12012488 q = 2.7697609 AU P = 8.205 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1990/ 071110 673 1.7+ 0.3+ 071116 850 0.2+ 0.6- 900924 260 0.7- 0.7- 071110 G96 0.7- 0.3+ 071116 850 0.1- 0.6- 900924 260 1.0+ 0.3- 071110 G96 0.2- 0.3+ 071116 204 0.6+ 0.2+ 2007/ 071110 673 0.5- 0.3+ 071117 204 0.7- 0.5+ 071014 691 0.3+ 0.2- 071110 G96 0.4+ 0.3+ 071118 213 0.1- 0.1- 071014 691 0.3- 0.2- 071110 G96 0.7- 0.2+ 071118 213 0.1- 0.1+ 071014 691 1.3- 0.3+ 071110 673 0.8+ 0.8+ 071118 213 0.2+ 0.5+ 071109 G96 0.5+ 0.3- 071110 711 0.1- 0.5+ 071128 215 0.5+ 0.0 071109 G96 0.1- 0.2+ 071110 711 0.9+ 0.1+ 071205 561 0.9+ 0.1- 071109 G96 0.4+ 0.2+ 071110 711 0.1+ 0.0 071205 561 0.2+ 0.0 071109 G96 0.4+ 0.1- 071110 474 0.1- 0.0 071205 561 (0.5+ 2.6+) 071109 G96 0.1- 0.2- 071110 474 0.1- 0.1- 071208 J47 0.8+ 0.4+ 071109 G96 0.0 0.0 071110 474 0.6+ 0.3- 071208 J47 0.8+ 0.1+ 071109 G96 0.0 0.2- 071110 213 0.6- 0.2+ 071208 J47 0.5+ 0.2- 071109 G96 0.5+ 0.3- 071110 213 0.8- 0.5+ 071230 204 0.3- 0.1+ 071109 G96 0.7+ 0.4- 071110 213 0.6- 0.6+ 2008/ 071109 235 0.8- 0.6- 071110 J47 (1.7- 2.5+) 080210 G96 0.4+ 0.3- 071109 235 0.7+ 0.1- 071110 J47 (2.1- 2.6+) 080210 G96 0.2+ 0.7- 071109 473 0.3- 1.9- 071111 J47 0.9- 0.7+ 080210 G96 0.1+ 0.8- 071109 473 (0.5- 2.8-) 071111 J47 0.8- 0.8+ 080210 G96 0.0 0.4- 071109 147 (2.8- 1.6-) 071111 349 0.2+ 0.2- 2015/ 071110 147 1.9- 1.5- 071111 349 0.6+ 0.0 150808 461 0.5- 0.0 071110 147 1.4- 1.4- 071111 349 0.6+ 0.1+ 150808 461 0.0 0.3+ 071110 H55 0.4+ 0.1+ 071114 704 0.7+ 0.7+ 150808 461 0.4- 0.5- 071110 H55 0.2+ 0.2+ 071114 704 0.8- 0.4+ 150809 461 0.1- 0.3+ 071110 H55 0.3+ 0.1+ 071114 704 0.1- 0.6+ 150809 461 0.4+ 0.2+ 071110 673 0.1- 0.2+ 071114 704 1.5- 0.1- 150809 461 0.5+ 0.2+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2015 Aug. 11

Back to Nakano Note Page