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: 08LD18
# Created Sun Dec 22 02:09:02 2024
# Orbit generated from Bernstein formalism
# Fitting 10 observations of 10
# Arc: 76.62d
# First observation: 2008/06/07
# Last observation: 2008/08/23
Preliminary a, adot, b, bdot, g, gdot:
-0.000002 0.061418 -0.000011 -0.010139 0.037554 0.000000
# Chi-squared of fit: 3.21 DOF: 14 RMS: 0.10
# Min/Max residuals: -0.13 0.31
# Exact a, adot, b, bdot, g, gdot:
1.978049E-05 4.190597E-02 -5.016005E-06 -1.069544E-02 3.437265E-02 8.156934E-03
# Covariance matrix:
3.1926E-13 4.3102E-11 -2.1658E-14 1.2780E-12 7.2318E-12 -1.8320E-10
4.3102E-11 1.2057E-07 -6.5928E-11 4.1971E-09 1.7848E-08 -8.0803E-07
-2.1658E-14 -6.5928E-11 2.9971E-13 -3.7794E-12 -9.7172E-12 4.4989E-10
1.2780E-12 4.1971E-09 -3.7794E-12 1.6665E-10 6.1698E-10 -2.8937E-08
7.2318E-12 1.7848E-08 -9.7172E-12 6.1698E-10 2.6526E-09 -1.1777E-07
-1.8320E-10 -8.0803E-07 4.4989E-10 -2.8937E-08 -1.1777E-07 5.7556E-06
# lat0 lon0 xBary yBary zBary JD0
3.352761 -85.488294 0.307109 0.056304 -0.960978 2454624.935154
# Heliocentric elements and errors
Epoch: 2454620.5000 = 2008/06/03
Mean Anomaly: 24.16277 +/- 4.510
Argument of Peri: 121.66492 +/- 10.288
Long of Asc Node: 106.52319 +/- 0.102
Inclination: 14.57173 +/- 0.112
Eccentricity: 0.30454973 +/- 0.0392
Semi-Major Axis: 40.22712386 +/- 0.7385
Time of Perihelion: 2448365.5885 +/- 1154.7
Perihelion: 27.97596426 +/- 1.6594
Aphelion: 52.47828345 +/- 1.8487
Period (y) 255.1448 +/- 7.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 2.05561471 +/- 0.0034
Ecliptic Y -29.94179870 +/- 0.0434
Ecliptic Z 1.70135069 +/- 0.0026
Ecliptic XDOT 0.00338884 +/- 0.0000
Ecliptic YDOT -0.00043273 +/- 0.0002
Ecliptic ZDOT -0.00081257 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 30.06046333 +/- 0.0432
Geocenter to KBO 29.09289857 +/- 0.0436
# Hcoef: 8.32
The following table shows the complete astrometric record for 08LD18. 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 (08LD18) followed by the observatory code and reference code for the source of the astrometry.
2008 06 07.43440 18 19 10.567 -20 00 41.33 23. r 08LD18 568 C~0gaI 2008 06 07.47281 18 19 10.322 -20 00 41.62 08LD18 568 C~0gaI 2008 06 07.51113 18 19 10.063 -20 00 41.84 08LD18 568 C~0gaI 2008 06 08.34093 18 19 04.721 -20 00 47.44 08LD18 304 C~0gaI 2008 06 08.36290 18 19 04.602 -20 00 47.53 08LD18 304 C~0gaI 2008 07 09.13333 18 15 37.945 -20 05 14.36 08LD18 807 C~0gaI 2008 07 09.19028 18 15 37.564 -20 05 15.17 08LD18 807 C~0gaI 2008 08 21.98611 18 11 56.171 -20 13 37.51 08LD18 304 C~0gaI 2008 08 22.07292 18 11 55.921 -20 13 38.57 08LD18 304 C~0gaI 2008 08 23.05555 18 11 53.121 -20 13 50.82 08LD18 304 C~0gaI
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 -0.10 0.00 0.02
2 0.0001 -3.46 -0.02 -0.17 -0.00
3 0.0002 -7.12 -0.13 -0.27 0.04
4 0.0025 -82.55 -0.04 -3.37 -0.05
5 0.0025 -84.23 0.31 -3.40 -0.00
6 0.0868 -3003.22 -0.00 -181.08 0.11
7 0.0869 -3008.61 -0.01 -181.73 -0.12
8 0.2068 -6139.38 -0.04 -605.47 0.06
9 0.2071 -6142.93 0.13 -606.46 0.06
10 0.2098 -6182.64 -0.08 -617.83 -0.11
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.
08LD18 quality flag:1 Type: CENTAURR CENTAURR CENTAURR axisobj 39.660 43.401 38.682 ecceobj 0.296 0.429 0.241 incobj 14.607 14.942 14.500 qmin 27.808 24.368 29.336 qmax 52.438 63.446 48.819 amean 39.825 43.695 38.880 amin 39.477 43.276 38.682 amax 40.170 44.092 39.078 emean 0.300 0.434 0.245 emin 0.296 0.425 0.241 emax 0.305 0.440 0.249 imean 13.016 13.066 12.909 imin 12.999 12.870 12.897 imax 13.028 13.364 12.921 excite_mean 0.375 0.490 0.332 fracstop 0.000 0.004 0.000 cjmean 2.894 2.803 2.923 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 121.1 107.4 138.2 kozaiamp 0.6 4.5 0.2