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: 09JT18 # Created Sun Dec 22 02:09:03 2024 # Orbit generated from Bernstein formalism # Fitting 9 observations of 9 # Arc: 10.91d # First observation: 2009/05/14 # Last observation: 2009/05/25 Preliminary a, adot, b, bdot, g, gdot: -0.000000 0.023335 -0.000000 0.004995 0.024282 0.000000 # WARNING Fitting with energy constraint # WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution # Chi-squared of fit: 2.10 DOF: 13 RMS: 0.09 # Min/Max residuals: -0.13 0.28 # Exact a, adot, b, bdot, g, gdot: 1.460564E-05 2.217020E-02 2.920059E-06 4.496464E-03 2.398443E-02 2.240814E-04 # Covariance matrix: 1.2617E-12 1.0004E-09 2.6639E-13 4.2106E-10 3.1255E-10 7.4374E-09 1.0004E-09 1.2811E-06 3.3607E-10 5.2889E-07 3.9376E-07 1.1501E-05 2.6639E-13 3.3607E-10 5.4137E-13 1.2084E-10 1.0304E-10 2.2608E-09 4.2106E-10 5.2889E-07 1.2084E-10 2.1965E-07 1.6277E-07 4.9103E-06 3.1255E-10 3.9376E-07 1.0304E-10 1.6277E-07 1.2087E-07 2.9638E-06 7.4374E-09 1.1501E-05 2.2608E-09 4.9103E-06 2.9638E-06 -1.1733E-03 # lat0 lon0 xBary yBary zBary JD0 15.110563 179.700240 -0.812011 0.156174 -0.578472 2454965.843927 # Heliocentric elements and errors Epoch: 2454960.5000 = 2009/05/09 Mean Anomaly: 150.80022 +/- 214.587 Argument of Peri: 260.02920 +/- 260.029 Long of Asc Node: 128.49826 +/- 1.087 Inclination: 18.57279 +/- 0.240 Eccentricity: 0.05644420 +/- 0.0564 Semi-Major Axis: 40.26494272 +/- 1.8076 Time of Perihelion: 2415868.4412 +/- 2295380.0 Perihelion: 37.99222036 +/- 2.8415 Aphelion: 42.53766508 +/- 2.9685 Period (y) 255.5047 +/- 17.21 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -40.85215978 +/- 0.5835 Ecliptic Y -0.60294045 +/- 0.0031 Ecliptic Z 10.86897862 +/- 0.1575 Ecliptic XDOT 0.00010083 +/- 0.0001 Ecliptic YDOT -0.00252728 +/- 0.0001 Ecliptic ZDOT 0.00050209 +/- 0.0005 # Distances at JD0 (AU) Heliocenter to KBO 42.27762046 +/- 0.5653 Geocenter to KBO 41.69371685 +/- 0.6044 # Hcoef: 8.53
The following table shows the complete astrometric record for 09JT18. 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 (09JT18) followed by the observatory code and reference code for the source of the astrometry.
2009 05 14.343161 12 23 26.048 +13 57 22.44 24.1i 09JT18 568 C~0aRT 2009 05 14.388589 12 23 25.916 +13 57 22.50 24.6i 09JT18 568 C~0aRT 2009 05 14.427572 12 23 25.807 +13 57 22.63 24.4i 09JT18 568 C~0aRT 2009 05 22.250570 12 23 06.056 +13 57 16.29 25.5g 09JT18 568 C~0aRT 2009 05 22.307228 12 23 05.922 +13 57 16.21 25.6g 09JT18 568 C~0aRU 2009 05 22.362884 12 23 05.791 +13 57 15.99 25.3g 09JT18 568 C~0aRU 2009 05 24.272180 12 23 01.671 +13 57 07.99 25.5g 09JT18 568 C~0aRU 2009 05 24.329497 12 23 01.554 +13 57 07.61 25.3g 09JT18 568 C~0aRU 2009 05 25.256021 12 22 59.669 +13 57 03.24 09JT18 568 C~0aRU
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 0.00 0.00 0.01
2 0.0001 -1.78 -0.00 -0.73 -0.02
3 0.0002 -3.28 0.01 -1.26 0.06
4 0.0216 -262.96 0.05 -124.85 -0.09
5 0.0218 -264.71 -0.03 -125.72 0.00
6 0.0220 -266.36 -0.05 -126.70 -0.03
7 0.0272 -317.80 -0.06 -158.56 -0.09
8 0.0273 -319.20 0.08 -159.61 -0.13
9 0.0299 -342.44 -0.01 -174.83 0.28
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.
09JT18 quality flag:1 Type: SCATEXTD SCATNEAR CENTAURR axisobj 40.191 49.843 37.099 ecceobj 0.060 0.248 0.318 incobj 18.553 19.548 17.449 qmin 37.328 37.003 22.381 qmax 43.628 63.973 51.481 amean 40.374 50.210 36.630 amin 40.071 49.739 33.286 amax 40.690 50.775 37.676 emean 0.057 0.246 0.336 emin 0.040 0.231 0.297 emax 0.073 0.261 0.385 imean 17.225 18.436 11.391 imin 16.398 18.009 5.589 imax 18.142 18.955 15.957 excite_mean 0.302 0.401 0.393 fracstop 1.000 1.000 0.173 cjmean 2.955 2.975 2.855 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 185.2 191.6 214.1 kozaiamp 180.0 179.9 179.3