Nakano Note (Nakano wa Kangaeru noda) NK 2007 C/1989 A5 (Shoemaker)
The following improved orbital elements, by S. Nakano, are from 57 observations 1988 Feb. 25 to 1989 Apr. 5. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.16 arc seconds. Pre-discovery observations were found by M. Meyer. See an orbit on MPC 16204 by Nakano. Epoch = 1989 Mar. 15.0 TT T = 1989 Feb. 26.08204 +/- 0.00205 (m.e.) TT Peri. = 19.10639 +/- 0.00062 Node = 137.13945 +/- 0.00005 (2000.0) Inc. = 96.55910 +/- 0.00016 q = 2.6396274 +/- 0.0000103 AU e = 0.9955511 +/- 0.0000360 1/a = +0.0016854 +/- 0.0000137 1/AU origin = +0.002254 (Q= 7) future = +0.001797 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1988/ 890128 897 0.9- 0.2+ 890207 657 1.3- 2.4+ 880225 260 0.3- 0.4- 890128 405 0.7+ 2.7- 890207 657 1.1- 1.2- 880225 260 0.2- 0.1+ 890128 405 (7.1- 4.5-) 890207 391 1.2+ 0.7- 880227 260 0.5+ 0.3+ 890128 405 (0.8+ 5.6-) 890207 391 0.4+ 0.0 1989/ 890129 892 0.9+ 2.0- 890207 046 1.4+ 0.6- 890113 675 0.6+ 1.4- 890129 892 0.4- 0.8- 890207 046 0.1- 0.5+ 890113 675 0.2+ 0.2- 890129 892 1.2- 0.7+ 890208 801 1.4+ 0.7+ 890114 675 0.4+ 1.7+ 890129 399 2.0+ 0.5+ 890208 046 0.3+ 0.9- 890115 400 (1.1+ 3.8+) 890129 399 0.7+ 1.3+ 890208 046 0.7- 1.8+ 890115 400 (3.2+ 0.7-) 890129 399 1.1+ 1.7+ 890210 657 0.8- 2.2+ 890115 400 (0.5- 3.2-) 890129 405 1.0- 2.3- 890213 391 0.9- 0.6- 890115 400 (0.4+ 6.7+) 890129 391 (2.9+ 4.8-) 890225 046 0.3+ 0.3+ 890115 402 (5.6+ 4.0+) 890129 391 1.6+ 1.2+ 890225 046 (1.7+ 2.9-) 890115 402 (9.9+ 0.6-) 890129 503 1.7+ 1.2- 890226 892 0.2+ 1.4+ 890115 400 1.2- 0.3+ 890131 675 1.4+ 1.1- 890226 892 (3.4- 0.2-) 890115 400 0.7- 1.9- 890202 675 0.2+ 1.2- 890301 897 0.3+ 1.8- 890115 400 (3.0- 3.4+) 890202 892 1.0- 1.7+ 890301 897 0.5- 0.3+ 890115 372 0.5+ 1.1+ 890202 892 (0.4- 3.1-) 890305 046 1.0- 2.0+ 890116 897 (3.6- 2.7+) 890202 046 2.2- 1.4- 890305 046 0.8+ 1.5- 890116 897 (4.5- 0.5+) 890202 046 0.9+ 0.5- 890308 897 0.9+ 0.3+ 890116 405 (7.3- 4.7+) 890204 391 (5.2+ 5.4-) 890310 801 1.0- 1.9+ 890116 405 (4.5- 0.3+) 890205 391 (1.7- 3.3-) 890310 373 0.7- 1.6+ 890116 405 (4.5- 2.1-) 890206 657 (0.2- 6.8-) 890310 373 0.2+ 1.5- 890117 875 1.2- 0.8- 890206 657 (5.8+ 2.4-) 890311 503 1.6+ 2.1- 890117 875 0.6- 1.7+ 890206 892(14.1+ 1.0-) 890405 373 0.2- 1.8- 890127 887 0.1+ 0.0 890206 892(14.8+ 0.8+) 890405 373 (1.1+ 5.8-) 890127 887 0.5- 0.3+ 890206 897 0.6+ 1.0+ 890528 293(52.1- 13.1+) 890127 887 0.1+ 0.9- 890206 897 2.1- 0.8+ 890128 897 2.1- 0.3+ 890206 391 1.2+ 0.5+ ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2010 Nov. 28