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: 09DO143 # Created Thu Apr 3 01:09:05 2025 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 67.75d # First observation: 2009/02/18 # Last observation: 2009/04/27 Preliminary a, adot, b, bdot, g, gdot: -0.000002 0.020953 -0.000000 -0.001419 0.022620 0.000000 # Chi-squared of fit: 1.84 DOF: 14 RMS: 0.08 # Min/Max residuals: -0.18 0.16 # Exact a, adot, b, bdot, g, gdot: 1.428916E-05 2.064342E-02 -1.008537E-06 -1.416226E-03 2.252433E-02 -2.092449E-03 # Covariance matrix: 2.9607E-13 -1.3139E-11 9.3451E-15 1.4636E-13 -9.3218E-13 2.9831E-10 -1.3139E-11 4.0593E-08 -5.3002E-11 -7.4772E-10 6.7818E-09 7.1530E-10 9.3451E-15 -5.3002E-11 2.9655E-13 -8.7443E-13 -8.9424E-12 -2.5325E-11 1.4636E-13 -7.4772E-10 -8.7443E-13 5.6743E-11 -1.2594E-10 -2.9170E-10 -9.3218E-13 6.7818E-09 -8.9424E-12 -1.2594E-10 1.1480E-09 4.4306E-09 2.9831E-10 7.1530E-10 -2.5325E-11 -2.9170E-10 4.4306E-09 1.3480E-06 # lat0 lon0 xBary yBary zBary JD0 11.144692 -174.828536 0.574656 0.156472 -0.794229 2454881.106125 # Heliocentric elements and errors Epoch: 2454880.5000 = 2009/02/18 Mean Anomaly: 263.97447 +/- 12.695 Argument of Peri: 218.02813 +/- 10.651 Long of Asc Node: 75.19033 +/- 0.169 Inclination: 11.57679 +/- 0.012 Eccentricity: 0.11796131 +/- 0.0515 Semi-Major Axis: 44.05720732 +/- 0.7519 Time of Perihelion: 2483371.5254 +/- 3695.3 Perihelion: 38.86016146 +/- 2.3643 Aphelion: 49.25425317 +/- 2.4200 Period (y) 292.4379 +/- 7.49 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -44.23746894 +/- 0.0653 Ecliptic Y -3.43192273 +/- 0.0059 Ecliptic Z 8.58124145 +/- 0.0129 Ecliptic XDOT 0.00044690 +/- 0.0001 Ecliptic YDOT -0.00247624 +/- 0.0000 Ecliptic ZDOT -0.00021816 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 45.19258188 +/- 0.0639 Geocenter to KBO 44.39643556 +/- 0.0668 # Hcoef: 8.69
The following table shows the complete astrometric record for 09DO143. 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 (09DO143) followed by the observatory code and reference code for the source of the astrometry.
2009 02 18.605359 12 36 44.722 +08 10 22.18 24.4i 09DO143 568 C~0aRQ 2009 02 18.642929 12 36 44.603 +08 10 23.31 24.7i 09DO143 568 C~0aRQ 2009 02 22.558180 12 36 32.039 +08 12 18.68 25.7g 09DO143 568 C~0aRQ 2009 02 22.614330 12 36 31.864 +08 12 20.40 26.0g 09DO143 568 C~0aRQ 2009 02 23.506410 12 36 28.872 +08 12 46.80 25.9g 09DO143 568 C~0aRQ 2009 02 23.561890 12 36 28.678 +08 12 48.50 25.4g 09DO143 568 C~0aRQ 2009 02 23.617500 12 36 28.493 +08 12 49.94 26.3g 09DO143 568 C~0aRQ 2009 03 25.428002 12 34 31.427 +08 27 21.13 09DO143 568 C~0aRQ 2009 03 25.454983 12 34 31.308 +08 27 21.76 09DO143 568 C~0aRQ 2009 04 27.354866 12 32 16.309 +08 39 02.00 09DO143 568 C~0aRQ
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 0.04 0.00 0.00
2 0.0001 -2.07 0.03 0.33 0.03
3 0.0108 -219.19 -0.06 31.41 0.01
4 0.0110 -222.26 0.13 31.95 0.16
5 0.0134 -273.53 -0.07 38.37 -0.05
6 0.0136 -276.85 -0.13 38.78 -0.02
7 0.0137 -279.94 0.04 39.00 -0.18
8 0.0953 -2220.84 0.00 143.53 0.08
9 0.0954 -2222.71 0.02 143.41 -0.02
10 0.1855 -4338.94 -0.00 -11.83 -0.02
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.
09DO143 quality flag:1 Type: CLASSICAL SCATNEAR 5:3EE axisobj 43.884 46.919 42.055 ecceobj 0.116 0.245 0.101 incobj 11.588 11.585 11.611 qmin 38.417 34.709 35.544 qmax 50.166 60.559 49.756 amean 44.147 47.240 42.328 amin 43.790 46.776 41.886 amax 44.542 47.889 42.821 emean 0.111 0.238 0.120 emin 0.097 0.209 0.073 emax 0.127 0.266 0.162 imean 9.782 8.697 9.288 imin 9.152 7.472 8.097 imax 10.409 10.584 10.699 excite_mean 0.203 0.282 0.202 fracstop 1.000 1.000 1.000 cjmean 3.054 3.043 3.034 libcent 0 -180.0 -180.0 185.2 libamp 0 -180.0 -180.0 146.4 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 182.6 185.4 272.5 kozaiamp 180.0 180.0 50.2