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: 99DH8
# Created Fri Nov 1 01:07:53 2024
# Orbit generated from Bernstein formalism
# Fitting 9 observations of 11
# Arc: 2.02y
# First observation: 1999/02/16
# Last observation: 2001/02/24
Preliminary a, adot, b, bdot, g, gdot:
0.000002 0.023492 -0.000002 0.001534 0.024276 0.000000
# Chi-squared of fit: 3.49 DOF: 12 RMS: 0.11
# Min/Max residuals: -0.19 0.27
# Exact a, adot, b, bdot, g, gdot:
1.516556E-05 2.342631E-02 2.621942E-07 1.530558E-03 2.404185E-02 -1.229492E-03
# Covariance matrix:
5.8719E-13 1.7010E-11 -5.4599E-14 1.0881E-12 2.3854E-11 3.5446E-10
1.7010E-11 1.3799E-09 -4.4557E-12 8.7389E-11 1.8911E-09 2.8481E-08
-5.4599E-14 -4.4557E-12 3.5403E-13 -4.7301E-13 -6.0994E-12 -9.1998E-11
1.0881E-12 8.7389E-11 -4.7301E-13 5.7416E-12 1.1977E-10 1.8040E-09
2.3854E-11 1.8911E-09 -6.0994E-12 1.1977E-10 2.5944E-09 3.9033E-08
3.5446E-10 2.8481E-08 -9.1998E-11 1.8040E-09 3.9033E-08 5.8795E-07
# lat0 lon0 xBary yBary zBary JD0
2.639645 139.596897 -0.135305 0.045169 -0.984546 2451225.774703
# Heliocentric elements and errors
Epoch: 2451220.5000 = 1999/02/11
Mean Anomaly: 302.13873 +/- 9.990
Argument of Peri: 97.95050 +/- 12.996
Long of Asc Node: 105.14226 +/- 0.019
Inclination: 4.53175 +/- 0.002
Eccentricity: 0.05368631 +/- 0.0317
Semi-Major Axis: 43.72794174 +/- 0.3855
Time of Perihelion: 2468195.9958 +/- 2922.4
Perihelion: 41.38034972 +/- 1.4328
Aphelion: 46.07553376 +/- 1.4438
Period (y) 289.1657 +/- 3.82
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -32.47081724 +/- 0.0670
Ecliptic Y 27.46652313 +/- 0.0571
Ecliptic Z 1.91559564 +/- 0.0041
Ecliptic XDOT -0.00161827 +/- 0.0001
Ecliptic YDOT -0.00211836 +/- 0.0001
Ecliptic ZDOT 0.00016767 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.57268340 +/- 0.0630
Geocenter to KBO 41.59414399 +/- 0.0881
# Hcoef: 8.66
The following table shows the complete astrometric record for 99DH8. 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 (99DH8) followed by the observatory code and reference code for the source of the astrometry.
1999 02 16.27396 09 31 31.21 +17 26 45.0 24.5R 99DH8 568 Ca5550 1999 02 16.37499 09 31 30.72 +17 26 47.3 24.5R 99DH8 568 Ca5550 1999 02 17.27226 09 31 26.41 +17 27 08.1 25.0V 99DH8 568 Ca5550 1999 02 17.42688 09 31 25.66 +17 27 11.7 99DH8 568 Ca5550 1999 05 09.98889 09 27 56.09 +17 41 14.5 24.5R 99DH8 807 Ca6741 1999 05 10.99861 09 27 56.89 +17 41 08.1 25.3R 99DH8 807 Ca6741 2000 03 30.26309 09 34 03.58 +17 19 17.8 99DH8 568 Cc7487 2000 03 30.30371 09 34 03.47 +17 19 18.3 24.6R 99DH8 568 Cc7487 2001 02 23.24056 09 41 48.76 +16 47 23.8 24.5R 99DH8 309 Cc7487 2001 02 24.11954 09 41 44.66 +16 47 44.1 24.4R 99DH8 309 Cc7487 2001 02 24.15440 09 41 44.52 +16 47 44.9 24.6R 99DH8 309 Cc7487
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 0.05 0.00 0.15
2 0.0003 -7.38 0.10 -0.05 0.08
3 0.0027 -72.47 -0.09 0.10 -0.09
4 0.0032 -83.79 -0.06 0.11 -0.10
5 0.2265 -3193.81 ( 3.28) -144.76 ( 1.48)
6 0.2292 -3180.95 ( 3.29) -147.26 ( 1.92)
7 1.1170 2209.92 -0.07 272.16 -0.08
8 1.1171 2208.27 0.07 272.13 -0.01
9 2.0204 9146.39 -0.19 633.14 0.06
10 2.0228 9083.99 -0.08 632.87 -0.06
11 2.0229 9081.83 0.27 632.96 0.05
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.
99DH8 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.849 45.514 43.148 ecceobj 0.054 0.154 0.056 incobj 4.528 4.523 4.533 qmin 40.770 37.956 39.270 qmax 47.314 53.786 47.384 amean 43.957 45.668 43.225 amin 43.616 45.285 42.887 amax 44.318 46.122 43.583 emean 0.053 0.152 0.068 emin 0.037 0.137 0.046 emax 0.068 0.167 0.087 imean 2.867 2.722 3.130 imin 2.211 1.895 2.057 imax 3.532 3.459 4.252 excite_mean 0.073 0.159 0.088 fracstop 1.000 1.000 1.000 cjmean 3.095 3.091 3.083 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 182.8 186.0 175.7 kozaiamp 179.9 179.9 179.9