OAA computing section circular NK 761 P/1999 V1 (Catalina)

The following improved orbital elements, by S. Nakano, are from 97 observations 1999 Nov. 5 to 2000 Apr. 24. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.74 arc second. Epoch = 1999 Oct. 29.0 TT T = 1999 Oct. 25.06334 +/- 0.01377 (m.e.) TT Peri. = 186.69552 +/- 0.00633 Node = 294.31128 +/- 0.00598 (2000.0) Inc. = 15.58696 +/- 0.00168 q = 2.9442939 +/- 0.0002269 AU e = 0.5504889 +/- 0.0000251 a = 6.5499912 +/- 0.0000952 AU n' = 0.05879535 +/- 0.00000128 P = 16.763 +/- 0.0003654 years (+/- 0.13 day) The predicted orbit for the 2016 return is as follows: T = 2016 Aug. 30.82855 TT Epoch = 2016 Sept. 9.0 TT Peri. = 186.94262 e = 0.5506810 Node = 294.37511 (2000.0) a = 6.5721620 AU Inc. = 15.56468 n'= 0.05849809 q = 2.9529969 AU P = 16.849 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 991113 372 (2.7- 2.4+) 000105 704 0.2+ 0.4- 991105 703 (1.2- 2.4+) 991116 360 0.0 0.5- 000105 704 1.9- 0.2+ 991105 703 (2.9+ 0.5+) 991116 360 0.1- 0.2- 000108 704 0.7+ 0.1- 991105 703 0.5- 1.3+ 991116 360 0.5- 0.0 000108 704 0.7+ 0.1+ 991105 703 0.8+ 0.3+ 991120 372 1.3- 1.0+ 000108 704 0.3- 0.1- 991106 649 0.1+ 0.1- 991121 046 0.2- 0.5+ 000108 704 1.3- 0.7- 991106 649 0.6- 0.1- 991121 046 0.4+ 0.4+ 000108 704 1.5- 0.5+ 991106 649 0.3+ 0.0 991121 046 0.6+ 0.4+ 000118 402 0.8+ 0.4- 991106 703 0.7- 0.3+ 991121 046 0.7+ 0.1+ 000118 402 0.9+ 0.6- 991106 703 0.3+ 0.2+ 991205 704 1.5+ 0.5- 000118 402 1.8+ 0.9- 991106 711 1.4+ 0.0 991205 704 0.8+ 0.5+ 000128 360 0.3+ 0.9- 991106 711 (4.4- 0.1-) 991205 704 0.4- 0.1+ 000128 372 (3.7- 0.3-) 991106 711 (3.4- 1.1-) 991207 372 0.0 0.8+ 000128 360 0.2+ 0.4- 991107 711 (2.8+ 0.6+) 991207 360 0.6+ 0.2- 000130 372 (4.7- 1.2+) 991107 711 (3.5+ 0.8-) 991207 360 0.3+ 0.3- 000206 704 0.3- 0.9+ 991107 711 (5.6+ 0.9+) 991207 360 0.9+ 0.3- 000206 704 0.6- 0.8+ 991107 327 0.1+ 0.2- 991211 372 1.4- 1.9+ 000206 704 0.1+ 0.8+ 991107 327 1.1- 0.7- 991213 691 0.9+ 0.6- 000206 704 (1.6- 2.1+) 991107 327 0.1- 1.5- 991213 691 1.4+ 0.6- 000209 372 1.5- 0.2- 991107 327 0.0 1.2- 991214 704 (2.3- 2.5+) 000211 372 1.2- 1.4- 991108 372 0.0 0.2+ 991214 704 0.5- 1.4+ 000224 706 0.8- 0.6+ 991108 327 0.1+ 0.3- 991214 704 1.5- 0.3+ 000224 706 0.6- 0.3+ 991108 327 0.3- 0.3- 991215 372 1.0- 1.3+ 000229 372 0.0 0.8+ 991108 327 0.8- 0.4- 991216 699 (2.9- 1.9+) 000301 703 0.1+ 0.1- 991109 897 1.5- 0.1- 991216 699 0.4- 0.9+ 000301 703 1.3+ 0.6+ 991109 897 1.9- 0.3+ 991216 699 (1.9- 2.5+) 000301 703 1.0- 0.3+ 991109 897 0.0 0.4- 991220 897 1.1- 0.2- 000301 703 0.7- 1.2+ 991109 897 0.5- 0.4- 991220 897 0.8+ 0.0 000302 360 0.3+ 0.5- 991109 402 1.4+ 0.9- 991220 897 1.1- 0.5+ 000302 360 0.7+ 0.6- 991109 402 0.0 0.4- 2000/ 000302 118 1.6+ 0.1- 991109 402 0.1+ 0.0 000101 372 0.9- 0.6- 000304 118 0.1+ 0.1+ 991109 900 (4.7- 0.7+) 000104 402 1.2+ 0.3- 000304 118 0.2+ 1.3+ 991109 900 (3.3- 1.0+) 000104 402 0.3+ 0.0 000304 118 0.7+ 0.1- 991112 695 0.5+ 0.6+ 000104 402 1.1+ 0.3- 000325 360 0.1- 0.7- 991112 695 0.5+ 0.6+ 000104 360 0.3+ 0.2- 000325 360 0.5+ 1.1- 991112 695 0.6+ 0.6+ 000104 360 0.5+ 0.3- 000424 360 1.1- 0.1- 991112 372 0.2+ 0.5- 000104 360 0.5+ 0.3- 000424 360 0.0 0.1+ 991113 402 1.1+ 0.4+ 000105 704 0.5+ 0.7- 991113 402 0.4- 0.2- 000105 704 0.9- 0.2- ( ) -------- Rejected Obs.

Director, Computing Section Later edition Syuichi Nakano 2000 May 22

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