The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.
# Object: 98WY24 # Created Sun Nov 22 02:37:10 2009 # Orbit generated from Bernstein formalism # Fitting 25 observations of 25 # Arc: 3.24y # First observation: 1998/11/18 # Last observation: 2002/02/14 Preliminary a, adot, b, bdot, g, gdot: 0.000134 0.024036 0.000001 0.000714 0.024615 0.000000 # Chi-squared of fit: 18.79 DOF: 44 RMS: 0.15 # Min/Max residuals: -0.39 0.37 # Exact a, adot, b, bdot, g, gdot: 1.438830E-05 2.408585E-02 -6.830478E-07 7.184630E-04 2.442904E-02 -4.286916E-04 # Covariance matrix: 1.5570E-13 -8.5048E-14 4.2826E-16 -2.3869E-15 8.5907E-14 -1.0560E-12 -8.5048E-14 1.0714E-12 -8.6159E-15 4.5500E-14 2.7802E-13 2.1164E-11 4.2826E-16 -8.6159E-15 1.2307E-13 -5.0177E-14 -1.9131E-15 -1.7798E-13 -2.3869E-15 4.5500E-14 -5.0177E-14 4.0710E-14 9.7239E-15 9.4125E-13 8.5907E-14 2.7802E-13 -1.9131E-15 9.7239E-15 3.6377E-13 4.6874E-12 -1.0560E-12 2.1164E-11 -1.7798E-13 9.4125E-13 4.6874E-12 4.3724E-10 # lat0 lon0 xBary yBary zBary JD0 -0.890176 76.000717 0.331435 -0.014628 -0.926879 2451135.938351 # Heliocentric elements and errors Epoch: 2451130.5000 = 1998/11/13 Mean Anomaly: 327.75375 +/- 0.985 Argument of Peri: 7.76004 +/- 1.087 Long of Asc Node: 102.60709 +/- 0.006 Inclination: 1.91212 +/- 0.000 Eccentricity: 0.04097286 +/- 0.0005 Semi-Major Axis: 43.34504039 +/- 0.0040 Time of Perihelion: 2460467.0045 +/- 285.3 Perihelion: 41.56907024 +/- 0.0201 Aphelion: 45.12101054 +/- 0.0201 Period (y) 285.3759 +/- 0.04 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 10.45500453 +/- 0.0003 Ecliptic Y 40.53300304 +/- 0.0010 Ecliptic Z -0.63598125 +/- 0.0000 Ecliptic XDOT -0.00263113 +/- 0.0000 Ecliptic YDOT 0.00061672 +/- 0.0000 Ecliptic ZDOT 0.00008123 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 41.86449483 +/- 0.0010 Geocenter to KBO 40.93488143 +/- 0.0010 # Hcoef: 6.66
The following table shows the complete astrometric record for 98WY24. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (98WY24) followed by the observatory code and reference code for the source of the astrometry.
1998 11 18.43762 04 59 35.44 +21 49 05.4 22.6R 98WY24 695 Ca3208 1998 11 18.50897 04 59 35.07 +21 49 04.7 98WY24 695 Ca3208 1998 11 19.49641 04 59 30.18 +21 48 57.5 22.5R 98WY24 695 a3608 1998 11 19.53615 04 59 29.97 +21 48 57.4 98WY24 695 a3608 1998 11 26.37301 04 58 55.18 +21 48 06.5 22.7R 98WY24 695 Ca3208 1998 11 27.37204 04 58 50.01 +21 47 59.2 98WY24 695 Ca3208 1998 12 19.01745 04 56 55.74 +21 45 18.4 22.7R 98WY24 950 a3608 1998 12 19.10795 04 56 55.29 +21 45 17.3 98WY24 950 a3608 1998 12 19.15789 04 56 55.04 +21 45 16.8 98WY24 950 a3608 1999 01 22.30591 04 54 23.97 +21 41 59.6 22.9R 98WY24 568 Ca5544 1999 01 22.35924 04 54 23.79 +21 41 59.7 98WY24 568 Ca5545 1999 01 23.34528 04 54 20.55 +21 41 55.8 98WY24 568 Ca5545 2000 11 23.44734 05 10 59.69 +22 09 06.5 22.8R 98WY24 695 Cc3588 2000 11 23.49502 05 10 59.45 +22 09 06.2 98WY24 695 Cc3588 2000 11 27.35230 05 10 39.68 +22 08 43.3 23.1R 98WY24 695 Cc3588 2000 11 27.42891 05 10 39.28 +22 08 42.9 23.1R 98WY24 695 Cc3588 2000 11 28.39859 05 10 34.24 +22 08 37.0 22.8R 98WY24 695 Cc3588 2000 11 29.37068 05 10 29.17 +22 08 31.1 23.1R 98WY24 695 Cc3588 2000 11 29.43688 05 10 28.81 +22 08 30.8 23.1R 98WY24 695 Cc3588 2001 01 25.16590 05 05 58.55 +22 03 39.7 22.7R 98WY24 695 Cc6418 2001 01 25.24633 05 05 58.30 +22 03 39.6 98WY24 695 Cc6418 2002 01 30.08376 05 11 38.65 +22 13 15.2 21.2 98WY24 304 Cf1458 2002 01 30.10590 05 11 38.57 +22 13 15.2 98WY24 304 Cf1458 2002 02 14.02889 05 11 03.99 +22 12 55.1 21.3R 98WY24 304 f1458 2002 02 14.08993 05 11 03.89 +22 12 55.0 98WY24 304 f1458
The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.
1 0.0000 0.00 0.25 0.00 0.24 2 0.0002 -5.20 0.05 -0.16 0.09 3 0.0029 -73.67 0.11 -0.26 0.02 4 0.0030 -76.59 -0.02 -0.06 0.24 5 0.0217 -563.76 -0.24 -0.16 -0.26 6 0.0245 -636.13 0.04 0.12 -0.11 7 0.0837 -2236.01 -0.39 9.61 0.37 8 0.0840 -2242.37 -0.06 9.19 -0.11 9 0.0841 -2245.88 0.10 9.07 -0.25 10 0.1776 -4360.42 0.07 44.58 -0.28 11 0.1777 -4362.90 0.13 44.96 0.02 12 0.1804 -4408.23 -0.02 46.15 -0.14 13 2.0151 9595.04 0.02 297.44 -0.03 14 2.0152 9591.68 0.08 297.43 -0.04 15 2.0258 9315.48 -0.02 298.05 -0.01 16 2.0260 9309.90 0.03 298.13 0.06 17 2.0286 9239.49 -0.03 298.25 -0.02 18 2.0313 9168.66 -0.02 298.42 -0.07 19 2.0315 9163.64 -0.13 298.55 0.05 20 2.1868 5391.86 -0.14 345.17 0.18 21 2.1870 5388.39 0.16 345.39 0.29 22 3.1996 10156.56 0.13 499.75 0.06 23 3.1996 10155.45 -0.03 499.84 0.13 24 3.2405 9674.17 -0.05 520.38 -0.19 25 3.2407 9672.77 -0.02 520.40 -0.26
The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.
98WY24 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.496 43.507 43.484 ecceobj 0.044 0.044 0.044 incobj 1.911 1.911 1.911 qmin 40.605 40.623 40.587 qmax 45.928 45.934 45.921 amean 43.250 43.260 43.240 amin 43.236 43.248 43.224 amax 43.267 43.278 43.255 emean 0.049 0.049 0.049 emin 0.036 0.036 0.036 emax 0.062 0.061 0.062 imean 1.024 1.020 1.028 imin 0.128 0.128 0.128 imax 1.601 1.594 1.609 excite_mean 0.053 0.053 0.053 fracstop 1.000 1.000 1.000 cjmean 3.089 3.089 3.089 libcent 0 -180.0 -180.0 -180.0 libamp 0 -180.0 -180.0 -180.0 libcent 1 -180.0 -180.0 -180.0 libamp 1 -180.0 -180.0 -180.0 libcent 2 -180.0 -180.0 -180.0 libamp 2 -180.0 -180.0 -180.0 libcent 3 -180.0 -180.0 -180.0 libamp 3 -180.0 -180.0 -180.0 libcent 4 -180.0 -180.0 -180.0 libamp 4 -180.0 -180.0 -180.0 kozaimean 179.1 178.9 180.2 kozaiamp 179.9 179.9 179.9