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: 99DL8
# Created Fri Jan 24 02:08:11 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 6 observations of 6
# Arc: 35.06d
# First observation: 1999/02/16
# Last observation: 1999/03/23
# Chi-squared of fit: 25.06 DOF: 6 RMS: 0.36
# Min/Max residuals: -0.73 0.57
# Exact a, adot, b, bdot, g, gdot:
-1.696571E-05 -1.552414E-02 1.118892E-06 1.325255E-03 1.725434E-02 -1.100697E-03
# Covariance matrix:
1.4846E-11 1.5536E-08 -7.5332E-14 3.1228E-10 2.7332E-09 -3.4419E-09
1.5536E-08 1.6694E-05 -8.0912E-11 3.3539E-07 2.9352E-06 -4.1158E-06
-7.5332E-14 -8.0912E-11 3.7316E-13 -5.6017E-12 -1.4228E-11 1.9378E-11
3.1228E-10 3.3539E-07 -5.6017E-12 6.8631E-09 5.8979E-08 -7.9100E-08
2.7332E-09 2.9352E-06 -1.4228E-11 5.8979E-08 5.1619E-07 -6.8051E-07
-3.4419E-09 -4.1158E-06 1.9378E-11 -7.9100E-08 -6.8051E-07 2.3353E-05
# lat0 lon0 xBary yBary zBary JD0
2.572478 140.089492 -0.126826 0.044065 -0.985724 2451225.774693
# Heliocentric elements and errors
Epoch: 2451226.5000 = 1999/02/17
Mean Anomaly: 347.37926 +/- 26.248
Argument of Peri: 48.47548 +/- 7.375
Long of Asc Node: 167.62298 +/- 5.786
Inclination: 174.51914 +/- 23.674
Eccentricity: 0.23838723 +/- 0.0420
Semi-Major Axis: 76.39827999 +/- 25.5462
Time of Perihelion: 2459777.2878 +/- 119380.2
Perihelion: 58.18590565 +/- 19.7191
Aphelion: 94.61065433 +/- 31.7984
Period (y) 667.7803 +/- 334.94
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -45.23984649 +/- 1.2978
Ecliptic Y 37.68346859 +/- 1.0858
Ecliptic Z 2.60133042 +/- 0.0760
Ecliptic XDOT 0.00171975 +/- 0.0006
Ecliptic YDOT 0.00178047 +/- 0.0006
Ecliptic ZDOT 0.00020224 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 58.93607754 +/- 1.2143
Geocenter to KBO 57.95651755 +/- 1.6938
# Hcoef: 8.19
The following table shows the complete astrometric record for 99DL8. 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 (99DL8) followed by the observatory code and reference code for the source of the astrometry.
1999 02 16.27395 09 33 23.11 +17 13 31.6 25.6R 99DL8 568 Ca9922 1999 02 16.38827 09 33 22.57 +17 13 34.3 25.4R 99DL8 568 Ca9922 1999 02 17.27225 09 33 18.41 +17 13 54.8 99DL8 568 Ca9922 1999 02 17.31905 09 33 18.17 +17 13 55.7 99DL8 568 Ca9922 1999 03 23.25283 09 30 54.25 +17 25 13.5 99DL8 568 Ca9922 1999 03 23.33770 09 30 53.94 +17 25 14.6 99DL8 568 Ca9922
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 0.57 0.00 -0.16
2 0.0003 0.00 0.52 0.00 -0.10
3 0.0027 0.00 -0.42 0.00 0.23
4 0.0029 0.00 -0.73 0.00 0.05
5 0.0958 0.00 0.01 0.00 0.13
6 0.0960 0.00 0.06 0.00 -0.15
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.
99DL8 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 76.044 76.044 76.044 ecceobj 0.235 0.235 0.235 incobj 174.513 174.513 174.513 qmin 57.148 57.161 57.143 qmax 95.459 95.472 95.490 amean 75.854 75.854 75.854 amin 75.067 75.064 75.070 amax 76.781 76.784 76.796 emean 0.233 0.233 0.233 emin 0.223 0.223 0.223 emax 0.243 0.243 0.243 imean 173.555 173.555 173.555 imin 173.476 173.476 173.476 imax 173.632 173.630 173.632 excite_mean 0.259 0.259 0.259 fracstop 1.000 1.000 1.000 cjmean -2.670 -2.670 -2.670 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 158.8 158.8 158.8 kozaiamp 107.3 107.5 107.3