Nakano Note (Nakano wa Kangaeru noda) NK 2381 273P/Pons-Gambart

This is a re-improved orbit,by S. Nakano, from 238 observations 1827 to 2013 since the residuals for 2013 January observations were shown about 10" up from an orbit in NK 2365. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The weighting mean residual is +/- 0.58 arc second. The past returns have occured in 257, 471, 673, 864, 1064, 1256, 1454 and 1645. Comet has passed 1.89 AU from Saturn in 1830 June and 0.29 AU from the Earth in 1645 Sept.. Epoch = 2012 Dec. 19.0 TT T = 2012 Dec. 19.66817 +/- 0.00033 (m.e.) TT Peri. = 20.18715 +/- 0.00051 Node = 320.43158 +/- 0.00018 (2000.0) Inc. = 136.39663 +/- 0.00011 q = 0.8101537 +/- 0.0000019 AU e = 0.9753211 +/- 0.0000001 a = 32.8277686 +/- 0.0000033 AU n' = 0.00524013 +/- 0.00000000 P = 188.088 +/- 0.0000280 years [ T = 257 July 10.71424 TT Epoch = 257 July 13.0 TT Peri. = 18.99597 e = 0.9787044 Node = 319.35416 (2000.0) a = 37.3737607 AU Inc. = 135.48405 n'= 0.00431374 q = 0.7958972 AU P = 228.481 years ] [ T = 471 Apr. 13.62241 TT Epoch = 471 Apr. 21.0 TT Peri. = 19.15572 e = 0.9778599 Node = 319.53063 (2000.0) a = 36.0807370 AU Inc. = 135.88552 n'= 0.00454769 q = 0.7988311 AU P = 216.727 years ] [ T = 673 Feb. 9.14103 TT Epoch = 673 Feb. 19.0 TT Peri. = 19.36901 e = 0.9767486 Node = 319.67021 (2000.0) a = 34.7034760 AU Inc. = 136.11972 n'= 0.00482108 q = 0.8069056 AU P = 204.437 years ] [ T = 864 Nov. 6.55715 TT Epoch = 864 Nov. 23.0 TT Peri. = 19.48364 e = 0.9763049 Node = 319.67060 (2000.0) a = 34.1296728 AU Inc. = 136.24444 n'= 0.00494317 q = 0.8087048 AU P = 199.388 years ] [ T = 1064 May 8.93742 TT Epoch = 1064 Apr. 27.0 TT Peri. = 19.72606 e = 0.9766839 Node = 319.94084 (2000.0) a = 34.5185890 AU Inc. = 136.16118 n'= 0.00485987 q = 0.8048402 AU P = 202.805 years ] [ T = 1256 June 3.47678 TT Epoch = 1256 May 29.0 TT Peri. = 19.84620 e = 0.9763354 Node = 319.99638 (2000.0) a = 34.0729087 AU Inc. = 136.25831 n'= 0.00495553 q = 0.8063201 AU P = 198.890 years ] [ T = 1454 Sept.20.75246 TT Epoch = 1454 Sept.27.0 TT Peri. = 19.95296 e = 0.9765223 Node = 320.19748 (2000.0) a = 34.2397432 AU Inc. = 136.15117 n'= 0.00491936 q = 0.8038707 AU P = 200.353 years ] [ T = 1645 Sept.25.74445 TT Epoch = 1645 Oct. 4.0 TT Peri. = 20.04631 e = 0.9759330 Node = 320.35818 (2000.0) a = 33.4413813 AU Inc. = 136.31613 n'= 0.00509657 q = 0.8048344 AU P = 193.387 years ] T = 1827 June 8.06767 TT Epoch = 1827 June 13.0 TT Peri. = 20.04884 e = 0.9754195 Node = 320.30133 (2000.0) a = 32.8698388 AU Inc. = 136.40994 n'= 0.00523007 q = 0.8079561 AU P = 188.450 years The predicted orbit for the 2191 return is as follows: T = 2191 June 16.15712 TT Epoch = 2191 June 24.0 TT Peri. = 20.28220 e = 0.9746405 Node = 320.53854 (2000.0) a = 32.0489611 AU Inc. = 136.55079 n'= 0.00543229 q = 0.8127466 AU P = 181.435 years The following residuals in seconds of arc (or two decimals in units of degrees) are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1827/ 121201 H47 0.1- 0.7+ 121206 H06 0.4- 0.1+ 270621 030(77.4+ 22.4+) 121201 H47 0.2+ 0.0 121206 H06 0.2- 0.4+ 270622 030(81.9+ 25.3-) 121201 H47 0.1+ 0.2+ 121206 H06 0.2- 0.3- 270623 030(0.04+ 0.01-) 121201 I39 0.1+ 0.0 121206 H06 0.2+ 0.1+ 270629 030 46.4+ 10.4- 121201 I39 0.2- 0.1+ 121206 H06 0.1+ 0.2+ 270629 030 38.2+ 16.1+ 121201 D88 1.0+ 0.3+ 121206 H06 0.4- 0.1- 270629 030 45.4+ 5.0+ 121201 D88 0.7+ 0.7+ 121206 H06 0.1- 0.0 270629 030(35.3+ 77.4+) 121201 E27 (2.4+ 1.7+) 121206 H06 0.1- 0.0 270701 030(74.9+ 22.7+) 121201 E27 0.8+ 0.2+ 121206 D95 0.2+ 0.5- 270701 030(74.4+ 17.4+) 121201 I39 0.0 0.2- 121206 D95 0.7- 0.6- 270701 030(76.8+ 35.0+) 121201 844 0.3- 0.2+ 121206 D95 (2.1- 1.4+) 270701 030(74.6+ 41.8+) 121201 844 0.3- 0.2- 121206 372 0.4- 0.2+ 270702 030(0.03+ 0.01+) 121201 I39 0.4- 0.1- 121206 372 0.2- 0.7+ 270702 030(0.03+ 0.01+) 121201 H47 0.4+ 0.7- 121206 372 0.2- 0.8+ 270703 030 0.7+ 12.2- 121201 844 0.1- 0.1- 121206 372 0.6- 0.7+ 270703 030 3.1- 1.1- 121201 H47 0.2- 0.4- 121206 E12 0.1- 0.4- 270703 030 30.1+ 0.2+ 121202 H47 0.3- 0.3- 121206 E12 0.8- 0.4- 270703 030 24.4+ 12.3- 121202 H47 0.1+ 0.0 121206 E12 0.2- 0.1- 270703 030 24.9+ 1.3+ 121202 H47 0.3- 0.3+ 121206 E12 0.1+ 0.2- 270703 030 14.4+ 4.0- 121202 H47 0.6- 0.2+ 121206 E12 0.1+ 0.3- 270704 030 28.4+ 33.7+ 121202 I39 0.1- 0.0 121208 H06 0.1- 0.1- 270704 030 28.2+ 32.3+ 121202 I47 0.3- 0.2- 121208 H06 0.1- 0.6- 270704 030 30.3+ 27.5+ 121202 I47 0.8+ 0.6- 121208 H06 0.0 0.1- 270705 030 44.0+ 31.9+ 121202 I47 0.2- 0.2+ 121208 H06 0.3- 0.2- 270705 030 37.3+ 20.2+ 121202 I47 0.3- 0.3+ 121208 H06 0.6- 0.6- 270706 020 21.5- 1.5- 121202 I47 0.0 0.1+ 121208 H06 0.2- 0.4- 270706 020(15.6- 70.9+) 121202 I47 0.5- 0.0 121208 H06 0.4- 0.1- 270706 020 9.6- 45.8+ 121202 I47 0.6- 0.2- 121208 349 0.5+ 1.1- 270706 020 6.7+ 13.8+ 121202 I47 0.4- 0.2+ 121208 349 1.0+ 0.6- 270706 030(42.4+ 58.6+) 121202 I47 0.6- 0.1- 121208 349 0.9+ 0.8- 270706 030(57.9+ 5.4-) 121202 I47 0.4- 0.0 121208 900 0.3+ 0.5- 270706 030 30.6+ 13.6- 121202 I47 0.5- 0.0 121208 349 1.0+ 1.0- 270706 030 33.3+ 42.5- 121202 H06 0.6- 0.1+ 121208 900 0.4+ 0.3+ 270706 030 29.0+ 4.0- 121202 H06 0.1- 0.4+ 121208 900 0.4+ 0.1- 270712 030 28.1+ 0.8- 121202 I47 0.4- 0.0 121209 349 0.2+ 0.1- 270713 030 26.8+ 4.5+ 121202 I47 0.0 0.1+ 121209 349 0.3+ 0.4- 270713 030 12.4+ 8.2- 121202 H06 0.6- 0.1- 121209 349 0.3+ 0.5- 270713 030 37.7+ 22.5+ 121202 H06 0.4- 0.5+ 121209 349 0.5+ 0.5- 270713 030 26.4+ 11.2- 121202 I47 0.4- 0.3- 121209 349 0.7+ 0.0 270713 030 28.9+ 0.7- 121202 H06 0.7- 0.1- 121209 349 0.3+ 0.4- 270713 030 33.9+ 4.2- 121202 I47 0.2- 0.4- 121210 372 0.3+ 0.0 270713 030 30.1+ 1.1+ 121202 H06 0.5- 0.0 121210 372 0.0 0.2+ 270713 030 19.8+ 6.3+ 121202 I47 0.1- 0.2+ 121210 372 0.1- 0.4+ 270714 030 20.2+ 2.7- 121203 I10 0.4- 0.3+ 121210 372 0.0 0.2+ 270714 030 31.5+ 13.0+ 121203 I10 0.2- 0.1+ 121210 372 0.3+ 0.2+ 270715 030 49.1+ 27.3+ 121203 I10 0.0 0.3+ 121210 204 1.7+ 0.8+ 270715 030(52.9+ 28.9+) 121203 H06 0.4- 0.1+ 121210 204 0.2+ 0.4- 270715 030 39.3+ 32.5+ 121203 H06 0.0 0.4+ 121210 204 1.2+ 0.4+ 270716 030 44.3+ 1.9+ 121203 H06 0.3- 0.1+ 121210 204 0.2- 0.7- 270716 030(55.2+ 5.5-) 121203 H06 0.6- 0.1- 121212 J24 1.2+ 0.2- 270716 030(54.9+ 52.7+) 121203 H06 0.5- 0.2+ 121212 J24 0.1- 0.6+ 270716 030 49.9+ 12.8- 121203 H06 0.6- 0.1+ 121212 J24 1.1+ 0.1- 270717 030 46.7+ 12.8- 121203 E07 0.1+ 0.2- 121212 J24 0.8+ 0.8- 270717 030 25.0+ 1.8- 121203 E07 0.3- 0.2- 121213 367 0.0 0.5+ 270717 030 19.1+ 11.0- 121203 E07 0.1- 0.1+ 121213 367 0.0 0.1+ 270718 030 11.5+ 11.6+ 121203 E12 0.8+ 0.0 121213 367 0.1- 1.1+ 270718 030 11.6+ 13.7+ 121203 E12 0.7- 0.2- 121213 367 1.0+ 0.8+ 270718 030 11.0+ 6.1+ 121203 E07 0.4+ 0.3- 121213 367 0.6+ 0.8+ 270719 030(51.6+ 29.0-) 121204 I10 1.5+ 0.0 121216 349 0.9+ 0.3- 270719 030 0.3- 30.8- 121204 I10 1.4+ 0.2- 121216 349 0.5+ 0.5- 270719 030 (7.4- 52.6-) 121204 I10 1.2+ 0.1- 121216 349 0.7+ 0.6- 270719 030(48.2+ 86.6+) 121204 H06 0.1+ 0.2- 121216 349 0.7+ 0.5- 270719 030(50.6+ 99.5+) 121204 H06 0.0 0.0 121216 349 0.3+ 1.2- 270720 030 24.1+ 1.0+ 121204 H06 0.3- 0.4- 121216 349 0.4+ 0.0 270720 030 29.8+ 22.1+ 121204 H06 0.5- 0.4+ 121217 370 1.3+ 0.3- 270720 030 30.1+ 3.3- 121204 H06 0.0 0.5+ 121217 370 1.0+ 0.3- 270720 030 17.8+ 2.4- 121204 H06 0.2- 0.1+ 121222 349 (4.5+ 0.5-) 270720 030 35.8+ 6.6+ 121204 372 1.4- 0.1- 121222 349 (2.4+ 2.0+) 270721 030 28.9+ 11.7- 121204 372 1.6- 0.1+ 2013/ 270721 030 37.9+ 19.6- 121204 372 1.6- 0.5+ 130112 349 0.0 1.0- 270721 030 37.0+ 4.4- 121204 372 1.1- 0.3- 130112 349 0.6+ 1.1- 270721 030 24.9+ 8.7- 121204 372 1.5- 1.1+ 130112 349 0.2- 0.2- 2012/ 121204 E07 0.2+ 0.1- 130112 349 0.4+ 0.5- 121129 E27 1.6+ 1.9- 121204 E07 0.2+ 0.6- 130117 H06 0.2+ 0.2+ 121129 E27 0.5+ 1.6+ 121204 E07 0.3+ 0.7- 130117 H06 0.3- 0.2+ 121130 E27 1.0+ 0.4+ 121204 J24 1.4- 0.7+ 130117 H06 0.3- 0.1+ 121130 E27 1.0+ 0.1+ 121204 J24 0.2- 0.4- 130117 H06 0.3- 0.2+ 121130 E27 1.3+ 1.0+ 121204 I39 1.1- 0.4- 130117 H06 0.1+ 0.3+ 121130 E27 0.7+ 0.3+ 121205 I39 0.8- 0.1+ 130117 H06 0.8- 0.0 121130 E27 1.1+ 0.7+ 121205 E07 0.1+ 0.2- 130118 349 0.4- 0.4+ 121130 E27 1.3+ 0.0 121205 E07 0.7+ 0.4- 130118 349 0.5- 0.6+ 121130 E12 0.2+ 0.0 121205 E07 0.3+ 0.5- 130118 349 0.6- 0.3+ 121130 E12 0.2+ 0.3- 121205 E07 0.8- 0.1+ 130118 900 0.3- 0.3+ 121130 E12 0.2- 0.5+ 121205 E07 1.0+ 1.3- 130118 900 0.4- 0.2- 121130 E12 0.2- 0.5+ 121205 G26 1.4- 1.8+ 130119 D88 0.6- 0.8+ 121130 E12 0.1+ 0.2+ 121205 G26 0.6- 1.5+ 130119 D88 0.2- 0.2- 121130 I39 0.0 0.4- 121205 G26 (3.4+ 1.3+) 130120 D81 1.5- 1.5+ 121130 I39 0.4- 0.1+ 121206 H06 0.4- 0.7- 130120 D81 1.0- 0.9+ 121201 H47 0.3- 0.0 121206 H06 0.5- 0.0 ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 Jan. 28

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