Table 2: NG parameters for the 81P/Wild 2 determined by linking three consecutive apparitions using symmetric and asymmetric models. Parameters A1, A2, A3 are given in units of 10-8 AU day-2. The residuals in parentheses represent a strictly gravitational model based on the same set of observations
Appearances 1978-1984-1990 1984-1990-1997 1990-1997-2003
Symmetric NG model  
  Model NGa Model NGb Model NGc
A1 0.09117 $\pm$ 0.01355 0.12411 $\pm$ 0.00975 0.11706 $\pm$ 0.00623
A2 0.02290 $\pm$ 0.00051 $0.01293\pm 0.00043$ $0.00860\pm 0.00020$
A3 $-0.03942\pm 0.00778$ $-0.08410\pm 0.00858$ $-0.05171\pm 0.00588$
rms 1 $.\!\!^{\prime\prime}$19 (2 $.\!\!^{\prime\prime}$45) 1 $.\!\!^{\prime\prime}$03 (1 $.\!\!^{\prime\prime}$55) 0 $.\!\!^{\prime\prime}$73 (1 $.\!\!^{\prime\prime}$40)
Asymmetric NG model  
A1 0.09097 $\pm$ 0.01383 0.05918 $\pm$ 0.00630 0.11123 $\pm$ 0.00618
A2 0.02352 $\pm$ 0.00384 $0.03109\pm 0.00130$ 0.03333 $\pm$ 0.00134
A3 $-0.04001\pm 0.00797$ $-0.09942\pm 0.00686$ $-0.07536\pm 0.00578$
$\tau$(days) $-2.6\pm 15.6$ $-117.3\pm 9.0$ $-77.6\pm 5.3$
rms 1 $.\!\!^{\prime\prime}$19 0 $.\!\!^{\prime\prime}$91 0 $.\!\!^{\prime\prime}$66
Number of res. 690 796 1056


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