OAA computing section circular NK 1597 199P/Shoemaker 4 (1994 J3 = 2008 G2)

The following improved orbital elements, by S. Nakano, are from 130 observations 1994 to 2008. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.72 arc second. See the prediction (delta-T correction = -1.68 days) in NK 1313 (= HICQ 2007). Epoch = 2009 Mar. 30.0 TT T = 2009 Apr. 9.81527 +/- 0.00720 (m.e.) TT Peri. = 191.92179 +/- 0.00128 Node = 92.94833 +/- 0.00006 (2000.0) Inc. = 24.76194 +/- 0.00008 q = 2.9353654 +/- 0.0000121 AU e = 0.5080505 +/- 0.0000021 a = 5.9668028 +/- 0.0000060 AU n' = 0.06762255 +/- 0.00000010 P = 14.575 +/- 0.0000219 years T = 1994 Oct. 14.57162 TT Epoch = 1994 Oct. 15.0 TT Peri. = 192.12420 e = 0.5054604 Node = 92.94329 (2000.0) a = 5.9536043 AU Inc. = 24.80294 n'= 0.06784754 q = 2.9442928 AU P = 14.527 years The predicted orbit for the 2023 return is as follows: T = 2023 Aug. 8.27314 TT Epoch = 2023 Aug. 4.0 TT Peri. = 191.77333 e = 0.5052290 Node = 92.34875 (2000.0) a = 5.8820612 AU Inc. = 24.93686 n'= 0.06908914 q = 2.9102732 AU P = 14.266 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1994/ 940604 111 1.1- 0.1- 940707 360 0.1+ 0.0 940514 675 0.1+ 1.2- 940604 111 0.3- 1.8+ 940707 360 0.2+ 0.2+ 940514 675 0.5- 1.0- 940604 675 0.3+ 0.2+ 940709 675 (0.7+ 2.5-) 940520 897 0.9- 0.1+ 940604 675 0.4- 0.1+ 940710 675 (2.1+ 1.2-) 940520 897 0.9- 0.3- 940606 675 (0.9+ 2.7-) 940711 675 0.2+ 0.2- 940520 372 1.0- 1.7- 940607 675 0.8+ 1.9- 940712 801 0.2- 0.3- 940520 897 0.0 0.5+ 940607 675 0.5- 1.4- 940712 817 (1.0+ 2.1+) 940520 372 1.3- 1.2- 940609 817 1.0+ 0.4- 940712 817 (0.9- 5.4+) 940522 817 1.5- 0.0 940609 817 1.7+ 0.1- 940712 675 1.1+ 1.4- 940522 817 0.2- 0.1- 940609 817 (3.2+ 1.9+) 940713 801 (1.6- 2.2+) 940522 817 1.2- 1.3+ 940609 817 (0.8+ 2.1+) 940713 801 1.8+ 1.3+ 940522 693 0.9- 0.2- 940609 801 0.1- 0.3+ 940713 675 1.2+ 1.1- 940522 693 0.6- 0.1- 940609 801 (2.3+ 2.0-) 940713 360 0.1+ 0.2+ 940522 693 0.2- 0.4- 940609 691 0.7+ 0.2- 940713 360 0.1+ 0.1- 940522 693 0.8- 0.0 940609 691 0.7+ 0.1- 940714 675 0.9+ 0.5- 940522 372 (0.4- 2.2-) 940609 691 0.7+ 0.2- 940801 675 0.7- 1.7- 940522 360 0.5- 0.0 940609 323 0.3- 1.5- 940801 675 0.1- 1.8- 940522 360 0.4- 0.7+ 940610 372 (1.4+ 2.1+) 940802 675 0.7+ 0.4- 940522 372 0.7+ 0.3- 940615 372 0.3+ 0.2+ 940802 675 0.6- 0.3- 940523 786 (1.9+ 9.2+) 940615 372 0.5+ 0.0 940804 675 0.5+ 0.2+ 940523 786 (1.2- 8.4+) 940616 817 1.4+ 1.1+ 940804 675 1.7- 0.4+ 940523 557 0.6+ 0.2- 940616 817 0.5+ 1.6+ 940807 801 (0.1+ 3.1+) 940523 557 0.6+ 0.4+ 940616 817 0.1+ 1.1+ 940807 801 (2.3+ 0.7+) 940523 557 0.7- 0.8+ 940616 817 1.1- 0.9+ 940812 381 1.0- 0.2+ 940528 817 (0.8+ 2.5+) 940616 817 1.6+ 0.4+ 940812 381 0.6- 0.3+ 940528 817 0.3- 1.8+ 940616 691 0.6- 0.8+ 940813 897 (2.7+ 0.7+) 940528 817 0.1+ 1.7+ 940616 691 0.5- 0.4+ 940813 897 0.6+ 0.4+ 940528 817 (0.1+ 2.0+) 940617 104 0.1- 0.5+ 940813 897 1.1+ 0.3- 940528 817 (2.3- 2.0+) 940617 104 0.2+ 0.5+ 940826 413 0.4- 0.3+ 940530 372 (2.1+ 0.1+) 940617 104 0.1+ 0.0 940826 413 0.8- 0.1+ 940601 817 0.3- 0.3+ 940617 104 0.3- 1.5- 940826 360 0.3+ 0.1+ 940601 817 1.5- 0.0 940617 104 0.5+ 0.9- 940826 360 0.3- 0.4- 940601 658 0.5+ 0.3+ 940617 104 0.1- 0.7- 940917 413 0.7- 0.6- 940601 658 0.3+ 0.3- 940617 104 0.2+ 0.4- 940917 413 0.7- 0.8- 940601 658 0.4+ 0.3+ 940617 104 0.3+ 0.4- 940918 413 0.8- 0.3- 940601 360 0.2- 0.0 940624 046 1.6+ 1.0- 2008/ 940601 360 0.1- 0.1+ 940624 046 0.6- 0.6- 080401 703 0.4+ 0.2+ 940602 675 0.4+ 0.1- 940624 046 0.2+ 1.0- 080401 703 0.2- 0.5+ 940602 675 0.2+ 0.7- 940624 046 0.2+ 0.2- 080401 703 0.8- 0.0 940602 410 1.3+ 1.0+ 940626 292 1.2+ 0.1+ 080401 703 0.8- 0.4- 940602 410 1.1- 0.0 940626 292 0.8- 1.0+ 080410 703 0.2- 0.0 940602 360 0.1+ 0.1+ 940702 360 0.1+ 0.1+ 080410 703 0.7- 0.1+ 940602 360 0.2- 0.0 940702 360 0.1+ 0.2+ 080410 703 1.0- 0.2- 940603 360 0.1- 0.5+ 940702 046 0.8+ 0.9+ 080410 703 0.9- 0.3- 940603 360 0.3- 0.2+ 940702 046 0.2- 0.0 080423 213 0.7+ 0.0 940603 897 0.2- 1.3+ 940702 046 0.5+ 0.1+ 080423 213 0.7+ 0.1+ 940603 897 0.4- 0.9+ 940702 046 0.5+ 0.5+ 080423 213 0.6+ 0.1+ 940603 897 0.8- 0.8- 940705 801 (2.4+ 0.9-) 080423 J31 1.1+ 0.1- 940603 372 0.3+ 0.8+ 940705 801 1.1+ 0.9+ 080424 473 0.2+ 0.1- 940603 372 0.2+ 0.4- 940705 372 0.8+ 0.6+ 080424 473 0.2+ 0.2- 940604 111 1.7- 0.5- 940705 372 0.5- 0.1+ 080424 473 0.3+ 0.2- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Apr. 28

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