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: 09DT143 # Created Tue Jan 21 02:09:10 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 63.83d # First observation: 2009/02/22 # Last observation: 2009/04/27 Preliminary a, adot, b, bdot, g, gdot: -0.000006 0.028578 -0.000000 0.014497 0.028824 0.000000 # Chi-squared of fit: 0.63 DOF: 10 RMS: 0.05 # Min/Max residuals: -0.11 0.12 # Exact a, adot, b, bdot, g, gdot: 1.442381E-05 2.712100E-02 7.845508E-06 1.448577E-02 2.853763E-02 -2.682026E-03 # Covariance matrix: 3.0918E-13 1.5395E-11 -1.6661E-14 4.8699E-14 3.4704E-12 1.4679E-10 1.5395E-11 5.2779E-08 -3.8466E-11 -8.9972E-10 8.6404E-09 -4.1723E-08 -1.6661E-14 -3.8466E-11 3.0492E-13 -1.5429E-12 -6.3883E-12 7.4791E-12 4.8699E-14 -8.9972E-10 -1.5429E-12 6.9423E-11 -1.3976E-10 2.7806E-09 3.4704E-12 8.6404E-09 -6.3883E-12 -1.3976E-10 1.4290E-09 -3.2971E-09 1.4679E-10 -4.1723E-08 7.4791E-12 2.7806E-09 -3.2971E-09 9.8799E-07 # lat0 lon0 xBary yBary zBary JD0 11.106749 -174.475021 0.523520 0.162660 -0.828486 2454885.013585 # Heliocentric elements and errors Epoch: 2454880.5000 = 2009/02/18 Mean Anomaly: 306.76520 +/- 4.711 Argument of Peri: 87.26280 +/- 7.418 Long of Asc Node: 165.43676 +/- 0.156 Inclination: 30.17025 +/- 0.193 Eccentricity: 0.12047215 +/- 0.0317 Semi-Major Axis: 38.23474860 +/- 0.4674 Time of Perihelion: 2467650.1467 +/- 1105.5 Perihelion: 33.62852619 +/- 1.2798 Aphelion: 42.84097102 +/- 1.3203 Period (y) 236.4262 +/- 4.34 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -35.11366166 +/- 0.0453 Ecliptic Y -2.87563943 +/- 0.0044 Ecliptic Z 6.75057782 +/- 0.0089 Ecliptic XDOT 0.00077362 +/- 0.0001 Ecliptic YDOT -0.00253646 +/- 0.0000 Ecliptic ZDOT 0.00131404 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 35.87211783 +/- 0.0444 Geocenter to KBO 35.04145413 +/- 0.0464 # Hcoef: 9.78
The following table shows the complete astrometric record for 09DT143. 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 (09DT143) followed by the observatory code and reference code for the source of the astrometry.
2009 02 22.512819 12 37 58.107 +07 59 57.47 24.6i 09DT143 568 C~0aRR 2009 02 22.558177 12 37 57.917 +07 59 59.55 25.9g 09DT143 568 C~0aRR 2009 02 22.614326 12 37 57.696 +08 00 02.14 25.8g 09DT143 568 C~0aRR 2009 02 23.506411 12 37 54.201 +08 00 42.89 26.1g 09DT143 568 C~0aRR 2009 02 23.617499 12 37 53.745 +08 00 47.97 26.0g 09DT143 568 C~0aRR 2009 03 25.427730 12 35 34.287 +08 23 16.73 24.8i 09DT143 568 C~0aRR 2009 03 25.454711 12 35 34.147 +08 23 17.95 25.0i 09DT143 568 C~0aRR 2009 04 27.338330 12 32 52.298 +08 42 37.63 09DT143 568 C~0aRR
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 0.12 0.00 0.04
2 0.0001 -3.42 -0.00 0.78 -0.01
3 0.0003 -7.46 0.02 1.84 0.04
4 0.0027 -71.34 -0.04 18.44 -0.02
5 0.0030 -79.58 -0.11 20.38 -0.05
6 0.0846 -2516.44 0.01 430.71 -0.03
7 0.0847 -2518.83 -0.00 431.00 0.04
8 0.1747 -5183.74 -0.00 540.45 -0.01
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.
09DT143 quality flag:2 Type: SCATEXTD SCATNEAR SCATEXTD axisobj 38.082 39.671 36.887 ecceobj 0.116 0.200 0.067 incobj 30.193 29.807 30.782 qmin 32.973 30.366 34.160 qmax 43.617 50.420 40.093 amean 38.209 40.189 37.012 amin 37.834 39.406 36.717 amax 38.585 40.975 37.342 emean 0.103 0.206 0.059 emin 0.076 0.167 0.042 emax 0.133 0.238 0.075 imean 29.736 29.030 30.303 imin 29.028 28.005 29.739 imax 30.415 29.999 30.895 excite_mean 0.507 0.527 0.508 fracstop 1.000 1.000 1.000 cjmean 2.735 2.726 2.726 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 186.0 175.4 177.9 kozaiamp 180.0 180.0 180.0