OAA computing section circular NK 1356 102P/Shoemaker 1

The following improved orbital elements, by S. Nakano, are from 23 observations 1991 to 2006, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effects of style II. The mean residual is +/- 1.03 arc seconds. The delta-T corrections are +3.99 days for NK 632 (H2O sublimation), -0.52 day for NK 945 and -3.43 days for NK 1150 (CO sublimation). Epoch = 2006 May 25.0 TT T = 2006 June 6.80896 +/- 0.00724 (m.e.) TT Peri. = 18.54404 +/- 0.00309 Node = 339.94598 +/- 0.00017 (2000.0) Inc. = 26.25209 +/- 0.00008 q = 1.9737805 +/- 0.0000086 AU e = 0.4721562 +/- 0.0000017 a = 3.7393272 +/- 0.0000055 AU n' = 0.13630566 +/- 0.00000030 P = 7.231 +/- 0.0000158 years A1 = +0.218 +/- 0.491 A2 = -0.72196 +/- 0.01755 T = 1991 Dec. 18.19506 TT Epoch = 1991 Dec. 10.0 TT Peri. = 18.75408 e = 0.4703122 Node = 339.95329 (2000.0) a = 3.7491975 AU Inc. = 26.24195 n'= 0.13576774 q = 1.9859040 AU P = 7.260 years T = 1999 Mar. 16.87166 TT Epoch = 1999 Mar. 3.0 TT Peri. = 18.66467 e = 0.4714486 Node = 339.97589 (2000.0) a = 3.7452405 AU Inc. = 26.26003 n'= 0.13598296 q = 1.9795522 AU P = 7.248 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1991/ 921202 691 0.4- 1.5+ 060724 J95 0.8+ 1.4+ 910608 474 1.2+ 1.3+ 921202 691 0.4+ 0.3+ 060724 J95 0.4+ 0.0 910608 474 1.8+ 0.8+ 921202 691 0.7+ 0.0 060724 J95 2.1+ 0.6- 910610 474 1.1+ 0.7- 1999/ 060725 J95 0.7+ 0.1- 910610 474 1.4- 0.2- 991231 461 0.3+ 0.7+ 060725 J95 0.9- 0.1- 910831 413 1.9- 1.4+ 991231 461 (4.6- 1.2-) 060725 J95 0.2- 1.8- 910901 372 (3.4- 2.1+) 991231 461 (4.9- 0.9+) 060728 J95 0.2- 1.3- 910901 372 0.5- 1.0- 2000/ 060728 J95 0.1- 0.8- 911105 801 1.2- 0.8+ 000101 461 0.9+ 1.2+ 060728 J95 0.2+ 0.9- 911105 801 1.5- 1.7+ 000101 461 1.1- 1.1- 1992/ 2006/ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2006 July 30

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