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: 99DR8
# Created Wed Nov 27 02:07:58 2024
# Orbit generated from Bernstein formalism
# Fitting 4 observations of 4
# Arc: 1.05d
# First observation: 1999/02/16
# Last observation: 1999/02/17
# WARNING Fitting with energy constraint
# WARNING and with gdot fixed = 0
# Chi-squared of fit: 0.45 DOF: 4 RMS: 0.06
# Min/Max residuals: -0.10 0.09
# Exact a, adot, b, bdot, g, gdot:
1.434955E-05 1.810691E-02 -2.181413E-06 -2.243419E-03 2.036812E-02 0.000000E+00
# Covariance matrix:
2.5602E-11 3.1713E-08 1.2970E-13 2.1320E-10 5.0816E-09 0.0000E+00
3.1713E-08 4.0589E-05 1.6407E-10 2.7073E-07 6.4412E-06 0.0000E+00
1.2970E-13 1.6407E-10 4.7045E-13 -1.4525E-10 2.6198E-11 0.0000E+00
2.1320E-10 2.7073E-07 -1.4525E-10 2.1074E-07 4.3142E-08 0.0000E+00
5.0816E-09 6.4412E-06 2.6198E-11 4.3142E-08 1.0274E-06 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 1.1119E-04
# lat0 lon0 xBary yBary zBary JD0
2.710138 140.056856 -0.127388 0.046430 -0.985543 2451225.774693
# Heliocentric elements and errors
Epoch: 2451220.5000 = 1999/02/11
Mean Anomaly: 22.18876 +/- 114.723
Argument of Peri: 136.57451 +/- 180.331
Long of Asc Node: 340.62806 +/- 7.921
Inclination: 7.57254 +/- 2.782
Eccentricity: 0.01424000 +/- 0.5581
Semi-Major Axis: 50.74328484 +/- 25.9818
Time of Perihelion: 2443082.8913 +/- 834218.9
Perihelion: 50.02070054 +/- 38.1827
Aphelion: 51.46586914 +/- 38.6829
Period (y) 361.4732 +/- 277.63
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -38.42957283 +/- 1.8710
Ecliptic Y 32.02129049 +/- 1.5671
Ecliptic Z 2.32132458 +/- 0.1155
Ecliptic XDOT -0.00157532 +/- 0.0012
Ecliptic YDOT -0.00184788 +/- 0.0011
Ecliptic ZDOT -0.00030122 +/- 0.0001
# Distances at JD0 (AU)
Heliocenter to KBO 50.07577918 +/- 1.7509
Geocenter to KBO 49.09633830 +/- 2.4433
# Hcoef: 9.30
The following table shows the complete astrometric record for 99DR8. 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 (99DR8) followed by the observatory code and reference code for the source of the astrometry.
1999 02 16.27395 09 33 26.40 +17 21 58.7 25.9R 99DR8 568 Ca9922 1999 02 16.38827 09 33 25.92 +17 22 00.6 99DR8 568 Ca9922 1999 02 17.27225 09 33 22.24 +17 22 16.9 99DR8 568 Ca9922 1999 02 17.31905 09 33 22.04 +17 22 17.8 99DR8 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 -0.06 0.00 0.09
2 0.0003 -7.12 0.07 -0.40 -0.10
3 0.0027 -62.25 0.02 -1.78 -0.00
4 0.0029 -65.25 -0.03 -1.84 0.02
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.
99DR8 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0