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: 09DM143 # Created Wed Nov 27 02:08:58 2024 # Orbit generated from Bernstein formalism # Fitting 13 observations of 13 # Arc: 71.88d # First observation: 2009/02/18 # Last observation: 2009/05/01 Preliminary a, adot, b, bdot, g, gdot: -0.000011 0.037611 -0.000005 0.007519 0.028926 0.000000 # Chi-squared of fit: 1.91 DOF: 20 RMS: 0.07 # Min/Max residuals: -0.12 0.14 # Exact a, adot, b, bdot, g, gdot: 1.811766E-05 3.290076E-02 4.189385E-06 7.498265E-03 2.815645E-02 3.375317E-03 # Covariance matrix: 3.1885E-13 -2.8703E-11 2.1661E-14 3.5492E-13 -3.1350E-12 3.2851E-10 -2.8703E-11 4.9366E-08 -6.0777E-11 1.9358E-10 7.9822E-09 -7.3673E-08 2.1661E-14 -6.0777E-11 2.9801E-13 -1.5650E-12 -1.0023E-11 4.8279E-11 3.5492E-13 1.9358E-10 -1.5650E-12 1.7960E-11 3.8646E-11 1.3289E-09 -3.1350E-12 7.9822E-09 -1.0023E-11 3.8646E-11 1.3117E-09 -7.3555E-09 3.2851E-10 -7.3673E-08 4.8279E-11 1.3289E-09 -7.3555E-09 1.1157E-06 # lat0 lon0 xBary yBary zBary JD0 10.165633 -176.315298 0.553619 0.145444 -0.811089 2454881.095146 # Heliocentric elements and errors Epoch: 2454880.5000 = 2009/02/18 Mean Anomaly: 8.70623 +/- 3.059 Argument of Peri: 19.16589 +/- 6.840 Long of Asc Node: 146.07856 +/- 0.181 Inclination: 16.32667 +/- 0.066 Eccentricity: 0.34139677 +/- 0.0148 Semi-Major Axis: 54.42010465 +/- 0.8993 Time of Perihelion: 2451334.2834 +/- 1243.0 Perihelion: 35.84125672 +/- 1.0017 Aphelion: 72.99895259 +/- 1.4518 Period (y) 401.4646 +/- 9.95 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -35.74147971 +/- 0.0449 Ecliptic Y -1.75211068 +/- 0.0029 Ecliptic Z 6.26850746 +/- 0.0081 Ecliptic XDOT 0.00001697 +/- 0.0001 Ecliptic YDOT -0.00320177 +/- 0.0000 Ecliptic ZDOT 0.00077548 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 36.32929189 +/- 0.0442 Geocenter to KBO 35.51583627 +/- 0.0457 # Hcoef: 9.34
The following table shows the complete astrometric record for 09DM143. 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 (09DM143) followed by the observatory code and reference code for the source of the astrometry.
2009 02 18.594380 12 29 45.201 +07 51 39.17 24.5i 09DM143 568 C~0aRQ 2009 02 18.632292 12 29 45.067 +07 51 40.69 24.8i 09DM143 568 C~0aRQ 2009 02 22.539875 12 29 30.432 +07 54 14.72 25.9g 09DM143 568 C~0aRQ 2009 02 22.598496 12 29 30.204 +07 54 16.92 25.3g 09DM143 568 C~0aRQ 2009 02 23.489931 12 29 26.735 +07 54 52.37 25.2g 09DM143 568 C~0aRQ 2009 02 23.546087 12 29 26.507 +07 54 54.70 25.1g 09DM143 568 C~0aRQ 2009 02 23.601690 12 29 26.287 +07 54 56.87 25.5g 09DM143 568 C~0aRQ 2009 03 25.444265 12 27 09.547 +08 14 27.09 09DM143 568 C~0aRQ 2009 04 27.267713 12 24 35.852 +08 30 33.70 09DM143 568 C~0aRQ 2009 05 01.350349 12 24 19.628 +08 31 52.43 09DM143 568 C~0aRQ 2009 05 01.393485 12 24 19.464 +08 31 53.04 09DM143 568 C~0aRQ 2009 05 01.432744 12 24 19.308 +08 31 53.73 09DM143 568 C~0aRQ 2009 05 01.471114 12 24 19.153 +08 31 54.35 09DM143 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 0.07 0.00 0.00
2 0.0001 -2.43 0.14 0.59 0.08
3 0.0108 -263.38 -0.12 54.60 0.00
4 0.0110 -267.37 -0.01 55.26 -0.08
5 0.0134 -328.79 -0.03 67.09 -0.07
6 0.0136 -332.83 -0.09 67.87 0.01
7 0.0137 -336.69 -0.02 68.55 -0.00
8 0.0954 -2666.11 0.05 329.02 0.09
9 0.1853 -5144.14 0.03 306.60 0.05
10 0.1965 -5396.43 -0.10 283.12 0.09
11 0.1966 -5398.91 0.05 282.71 -0.02
12 0.1967 -5401.31 0.03 282.42 -0.04
13 0.1968 -5403.67 -0.01 282.08 -0.12
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.
09DM143 quality flag:1 Type: SCATNEAR 8:3EEEEE SCATNEAR axisobj 54.234 57.455 51.640 ecceobj 0.340 0.391 0.300 incobj 16.323 16.228 16.492 qmin 34.770 34.344 34.898 qmax 75.464 82.959 69.647 amean 54.617 57.901 51.901 amin 53.994 57.063 51.349 amax 55.444 58.951 52.572 emean 0.346 0.396 0.308 emin 0.330 0.384 0.291 emax 0.362 0.407 0.326 imean 14.973 14.990 14.926 imin 14.220 14.678 14.173 imax 15.953 15.298 15.668 excite_mean 0.432 0.473 0.401 fracstop 1.000 1.000 1.000 cjmean 2.993 2.980 2.995 libcent 0 -180.0 181.3 -180.0 libamp 0 -180.0 149.2 -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 178.4 150.4 170.8 kozaiamp 179.9 180.0 180.0