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: 99DG8
# Created Wed Nov 27 02:07:57 2024
# Orbit generated from Bernstein formalism
# Fitting 4 observations of 4
# Arc: 1.04d
# 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: 0.69 DOF: 4 RMS: 0.07
# Min/Max residuals: -0.11 0.11
# Exact a, adot, b, bdot, g, gdot:
1.042273E-05 1.129364E-02 -7.979443E-06 -7.981987E-03 1.691742E-02 0.000000E+00
# Covariance matrix:
3.4213E-11 3.5621E-08 1.1363E-13 4.1463E-10 5.7026E-09 0.0000E+00
3.5621E-08 3.7938E-05 1.1895E-10 4.4046E-07 6.0262E-06 0.0000E+00
1.1363E-13 1.1895E-10 4.1496E-13 -9.4987E-11 1.9111E-11 0.0000E+00
4.1463E-10 4.4046E-07 -9.4987E-11 2.0144E-07 7.0084E-08 0.0000E+00
5.7026E-09 6.0262E-06 1.9111E-11 7.0084E-08 9.6218E-07 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 6.3712E-05
# lat0 lon0 xBary yBary zBary JD0
2.719650 139.644166 -0.134492 0.046549 -0.984593 2451225.774703
# Heliocentric elements and errors
Epoch: 2451220.5000 = 1999/02/11
Mean Anomaly: 22.06562 +/- 117.263
Argument of Peri: 152.68413 +/- 184.484
Long of Asc Node: 323.53214 +/- 2.100
Inclination: 35.43706 +/- 15.054
Eccentricity: 0.01421849 +/- 0.5620
Semi-Major Axis: 60.88970210 +/- 30.9766
Time of Perihelion: 2440583.2887 +/- 1097774.3
Perihelion: 60.02394232 +/- 45.8643
Aphelion: 61.75546189 +/- 46.4554
Period (y) 475.1426 +/- 362.58
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -45.82418462 +/- 2.6086
Ecliptic Y 38.76842911 +/- 2.2171
Ecliptic Z 2.80427272 +/- 0.1626
Ecliptic XDOT -0.00123197 +/- 0.0011
Ecliptic YDOT -0.00134411 +/- 0.0011
Ecliptic ZDOT -0.00129032 +/- 0.0001
# Distances at JD0 (AU)
Heliocenter to KBO 60.08919151 +/- 2.4502
Geocenter to KBO 59.11067498 +/- 3.4274
# Hcoef: 8.20
The following table shows the complete astrometric record for 99DG8. 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 (99DG8) followed by the observatory code and reference code for the source of the astrometry.
1999 02 16.27396 09 31 48.87 +17 30 24.1 25.5R 99DG8 568 Ca5550 1999 02 16.31992 09 31 48.69 +17 30 24.5 25.7R 99DG8 568 Ca5550 1999 02 17.27226 09 31 45.19 +17 30 36.4 99DG8 568 Ca5550 1999 02 17.31258 09 31 45.04 +17 30 37.1 99DG8 568 Ca5550
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 0.03 0.00 0.11
2 0.0001 -2.57 -0.03 -0.44 -0.11
3 0.0027 -53.82 0.03 -5.07 -0.09
4 0.0028 -56.08 -0.03 -5.09 0.09
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.
99DG8 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