OAA computing section circular NK 1659 P/1997 G1 (Montani)

The following improved orbital elements, by S. Nakano, are from 75 observations 1997 Apr. 9 to 1998 June 18. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. See orbits on MPC 30957 and MPC 31347. Epoch = 1997 Apr. 22.0 TT T = 1997 Apr. 6.76623 +/- 0.01319 (m.e.) TT Peri. = 213.49330 +/- 0.00200 Node = 267.87493 +/- 0.00073 (2000.0) Inc. = 3.98971 +/- 0.00004 q = 4.2142946 +/- 0.0000146 AU e = 0.4165723 +/- 0.0000247 a = 7.2233367 +/- 0.0000424 AU n' = 0.05076885 +/- 0.00000045 P = 19.414 +/- 0.0001710 years (+/- 0.06 day) Following observations included: PK97G010 C1997 11 24.48841 10 57 44.04 +02 50 28.2 7BO705 17.4 V 691 PK97G010 C1997 11 24.49477 10 57 44.16 +02 50 27.6 7BO705 16.3 V 691 PK97G010 C1997 11 24.50100 10 57 44.16 +02 50 27.7 7BO705 16.3 V 691 The predicted orbit for the 2016 return is as follows: T = 2016 Oct. 9.34796 TT Epoch = 2016 Oct. 19.0 TT Peri. = 213.74671 e = 0.4169813 Node = 267.70541 (2000.0) a = 7.2618877 AU Inc. = 3.97866 n'= 0.05036511 q = 4.2338166 AU P = 19.569 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1997/ 970501 046 0.1- 1.4+ 971205 867 0.3+ 0.2+ 970409 691 0.8- 0.2- 970514 696 0.6+ 0.2- 971227 360 0.8+ 0.4- 970409 691 0.1- 0.4- 970514 696 0.1- 0.1- 971227 360 0.4- 0.9- 970409 691 0.2- 0.1- 970514 696 0.6+ 0.1- 1998/ 970410 691 0.6+ 0.3- 970514 691 (2.3- 1.5-) 980131 691 0.6- 0.5- 970410 691 0.5+ 0.5- 970514 691 1.7- 0.3- 980201 867 0.2- 0.2- 970410 691 1.1+ 0.3+ 970514 691 0.1+ 0.6+ 980201 867 0.3- 0.5- 970411 691 0.2- 0.3+ 970514 691 0.4- 0.5+ 980201 867 0.9- 0.1- 970411 691 0.1+ 0.1- 970517 381 0.4+ 0.5+ 980202 360 0.9+ 0.4- 970411 658 0.7- 1.1- 970517 381 0.7- 0.4- 980202 360 0.2+ 0.5- 970411 658 1.3- 0.8- 970519 046 0.2- 0.1- 980202 360 0.6+ 0.8- 970412 658 0.7- 0.3+ 970524 709 1.6+ 0.5- 980222 691 0.3- 0.1- 970412 658 0.1+ 0.2+ 970525 360 0.1+ 0.5+ 980222 691 0.6+ 0.1- 970412 658 0.0 0.2- 970526 360 0.1+ 0.8- 980222 691 0.1+ 0.7+ 970419 658 0.1- 0.2+ 970526 360 0.8+ 0.0 980302 402 0.3- 0.2+ 970419 658 1.1+ 0.3+ 970526 360 0.1+ 0.4+ 980302 402 0.3- 0.5- 970419 658 0.1- 0.2+ 970601 696 0.5+ 0.0 980302 402 0.5+ 0.0 970424 402 0.4+ 1.5+ 970601 696 0.0 0.2- 980302 360 0.1- 0.7+ 970424 402 0.7- 0.9- 970604 691 (3.9- 3.2+) 980302 360 0.4- 1.0+ 970424 402 0.4+ 0.6+ 970604 691 1.3+ 0.5+ 980304 704 (3.2- 0.8+) 970424 046 (2.7+ 1.7-) 970604 691 1.1- 1.0- 980304 704 (4.5- 2.0+) 970424 046 1.7+ 1.7- 971124 691 (2.7+ 3.3-) 980304 704 (5.2- 2.1+) 970427 402 1.6- 1.5+ 971124 691 (1.3+ 2.2-) 980304 704 (8.9- 1.2-) 970427 402 0.5- 0.3+ 971124 691 1.8- 0.4- 980524 691 0.6- 0.1+ 970427 402 0.1- 1.2+ 971124 691 0.1- 0.9+ 980524 691 0.4- 0.4+ 970501 691 0.4- 0.5- 971124 691 0.4+ 0.1+ 980524 691 0.4+ 0.3- 970501 691 0.3- 0.3- 971124 691 0.6- 0.3+ 980618 696 0.5+ 0.1- 970501 691 0.8+ 0.1- 971205 867 0.6+ 0.3+ 980618 696 0.2+ 0.1+ 970501 046 (0.0 2.2+) 971205 867 0.3+ 0.5+ 980618 696 0.5+ 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Sept. 2

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