Nakano Note (Nakano wa Kangaeru noda) NK 2008 C/1989 Y1 (Skorichenko-George)
The following improved orbital elements, by S. Nakano, are from 90 observations 1988 June 13 to 1991 Mar. 18. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.13 arc seconds. The comet has passed 3.75 AU from Saturn on 1987 Dec. 17 and 3.24 AU from Jupiter on 1990 Aug. 15 UT. Pre-discovery observations were found by M. Meyer. See an orbit on MPC 17400 (= HICQ 1992) by Nakano and an orbit on MPC 20308 by K. Muraoka. Epoch = 1990 Apr. 19.0 TT T = 1990 Apr. 11.92954 +/- 0.00023 (m.e.) TT Peri. = 137.83356 +/- 0.00011 Node = 280.00923 +/- 0.00012 (2000.0) Inc. = 59.36603 +/- 0.00005 q = 1.5691626 +/- 0.0000020 AU e = 1.0003599 +/- 0.0000053 1/a = -0.0002294 +/- 0.0000034 1/AU origin = +0.000006 (Q= 8) future = +0.000594 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1988/ 891228 046 0.1+ 0.1- 900312 372 0.5+ 1.9+ 880613 260 2.0+ 0.7- 891229 046 1.3+ 0.3- 900312 372 1.3+ 1.5+ 880613 260 1.0+ 1.0+ 891229 046 0.6- 0.3- 900312 503 0.8- 0.8- 1989/ 891231 046 1.4+ 1.8- 900315 897 0.5+ 1.7+ 891220 688 1.1- 2.7- 891231 046 1.1+ 0.2+ 900315 897 0.6+ 0.8+ 891220 688 (1.6- 3.7-) 1990/ 900315 046 0.2- 2.3- 891220 892 2.0- 0.8- 900101 046 0.5+ 0.2- 900315 046 1.7+ 0.7- 891221 688 0.4+ 1.6- 900101 046 1.8+ 0.4+ 900316 046 1.8- 1.6- 891221 688 0.5- 2.0- 900107 364 (4.6+ 0.5-) 900316 046 0.9- 2.1- 891221 892 0.4+ 0.1- 900107 364 0.7+ 2.6+ 900317 046 2.5- 0.4+ 891221 892 0.3+ 0.0 900108 897 0.9- 1.8+ Y 900317 046 0.8- 0.8- 891221 875 1.5- 0.7+ 900108 897 0.8- 0.7- 900319 897 (4.5+ 1.7+) 891221 897 (2.8+ 0.5-)Y 900113 210 0.5- 1.6+ 900319 897 0.1- 0.1- 891222 046 (0.2+ 5.1-) 900114 046 0.5+ 0.2- 900319 897 0.8- 1.7- 891222 046 0.3+ 0.3- 900114 046 0.7+ 0.9- 900327 657 (1.2- 4.3-) 891223 897 0.3- 1.2- 900121 364 (5.1- 0.7-) 900327 657 2.3+ 0.8- 891223 402 1.5- 0.4+ 900121 364 (5.5- 0.1-) 900328 657 1.2- 2.0- 891223 892 0.2- 0.6+ 900122 046 0.3- 0.2- 900328 657 2.3- 1.5- 891223 404 1.1- 1.5+ 900122 046 0.3+ 0.1- 900331 026 (3.7- 1.1+) 891223 897 0.5- 1.4- 900127 364 1.3- 0.1+ 900404 657 2.3- 1.1- 891223 404 0.5- 2.4+ 900129 046 1.2- 1.2- 900405 657 0.9+ 1.1- 891224 688 (1.4- 4.1-) 900129 046 1.4- 0.1- 900405 657 0.0 1.4- 891224 688 (0.2- 3.0-) 900212 897 0.7- 1.2+ 900427 587 (5.1- 0.2-) 891224 400 1.0- 0.8+ 900217 046 0.3+ 1.6+ 900515 372 2.5- 0.9+ 891224 400 (3.0- 0.1-) 900217 046 0.1- 1.8+ 900515 372 (3.0- 1.1-) 891224 400 0.6- 1.9+ 900220 046 0.3+ 1.8+ 901016 413 (0.6- 5.9+) 891225 046 0.6+ 0.2- 900220 046 0.2- 0.3+ 901017 413 (2.0+ 3.5+) 891225 046 0.2+ 0.3- 900221 046 0.6+ 1.0- 901030 372 (0.1+ 3.9+) 891225 494 0.2- 0.2+ 900221 046 0.1- 1.2+ 901030 372 (1.1+ 3.4+) 891226 046 1.2- 0.1+ 900222 046 0.5+ 1.1+ 901227 474 1.8+ 0.1- 891226 046 0.2+ 0.3- 900222 046 0.6+ 1.6+ 901227 474 1.3+ 0.7+ 891227 978 0.5+ 0.6- 900223 046 1.4+ 0.2+ 1991/ 891227 026 0.1- 0.2- 900223 046 0.4- 0.5+ 910207 413 0.4- 0.3- 891227 978 1.0+ 0.4+ 900224 046 2.2+ 0.2+ 910207 413 1.3+ 0.8+ 891228 897 0.6- 0.7- 900224 046 0.6+ 1.0+ 910308 474 0.1+ 0.7+ 891228 892 (7.1- 0.1+) 900226 801 0.9+ 1.1+ 910308 474 1.1- 0.9+ 891228 897 2.2- 0.5- 900226 801 0.1+ 1.4+ 910318 413 0.7- 1.1- 891228 046 1.5+ 2.0- 900226 657 1.6+ 0.6+ ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2010 Nov. 28