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: 21TH192 # Created Sun Oct 19 01:12:16 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 12 observations of 12 # Arc: 6.06y # First observation: 2019/08/29 # Last observation: 2025/09/20 # Chi-squared of fit: 0.62 DOF: 18 RMS: 0.04 # Min/Max residuals: -0.09 0.04 # Exact a, adot, b, bdot, g, gdot: 1.553200E-05 2.458962E-02 -4.041383E-08 -6.146209E-05 2.473695E-02 -1.645253E-04 # Covariance matrix: 7.0751E-13 -3.2910E-13 -1.4489E-15 8.9089E-16 3.6555E-13 -1.6629E-12 -3.2910E-13 6.3027E-13 1.9061E-16 -1.3189E-15 8.9048E-13 3.7790E-12 -1.4489E-15 1.9061E-16 2.9719E-13 -7.7788E-14 -3.0481E-15 1.5187E-15 8.9089E-16 -1.3189E-15 -7.7788E-14 3.4523E-14 -1.1566E-15 -8.4418E-15 3.6555E-13 8.9048E-13 -3.0481E-15 -1.1566E-15 3.1362E-12 5.4808E-12 -1.6629E-12 3.7790E-12 1.5187E-15 -8.4418E-15 5.4808E-12 2.3986E-11 # lat0 lon0 xBary yBary zBary JD0 -1.931729 -10.227462 0.245010 -0.032832 -0.973591 2458724.712719 # Heliocentric elements and errors Epoch: 2458724.5000 = 2019/08/29 Mean Anomaly: 346.17470 +/- 0.251 Argument of Peri: 280.30543 +/- 0.273 Long of Asc Node: 84.07221 +/- 0.013 Inclination: 1.89228 +/- 0.000 Eccentricity: 0.03917607 +/- 0.0002 Semi-Major Axis: 43.03695027 +/- 0.0113 Time of Perihelion: 2462684.8424 +/- 81.8 Perihelion: 41.35093183 +/- 0.0140 Aphelion: 44.72296872 +/- 0.0147 Period (y) 282.3387 +/- 0.11 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 40.67843123 +/- 0.0028 Ecliptic Y -7.59476872 +/- 0.0005 Ecliptic Z -1.36268498 +/- 0.0001 Ecliptic XDOT 0.00047355 +/- 0.0000 Ecliptic YDOT 0.00268215 +/- 0.0000 Ecliptic ZDOT -0.00000641 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 41.40377641 +/- 0.0028 Geocenter to KBO 40.42539226 +/- 0.0029 # Hcoef: 7.79
The following table shows the complete astrometric record for 21TH192. 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 (21TH192) followed by the observatory code and reference code for the source of the astrometry.
2019 08 29.211918 23 25 27.040 -05 49 35.07 23.7r 21TH192 W84 C~7XPv 2019 08 29.387113 23 25 26.264 -05 49 40.09 23.7r 21TH192 W84 C~7XPv 2020 10 16.001792 23 27 10.910 -05 38 19.65 23.7r 21TH192 W84 C~7XPv 2020 10 16.175804 23 27 10.252 -05 38 23.50 23.7r 21TH192 W84 C~7XPv 2021 09 13.055538 23 34 45.459 -04 50 19.90 23.6r 21TH192 W84 C~7XPv 2021 09 13.174687 23 34 44.912 -04 50 23.46 23.6r 21TH192 W84 C~7XPv 2021 10 02.07500 23 33 20.80 -04 59 16.0 24.1V 21TH192 W84 C~7XPv 2021 10 02.09757 23 33 20.70 -04 59 16.7 24.5V 21TH192 W84 C~7XPv 2021 10 02.14223 23 33 20.50 -04 59 17.8 24.5V 21TH192 W84 C~7XPv 2021 10 02.16466 23 33 20.40 -04 59 18.4 24.1V 21TH192 W84 C~7XPv 2025 09 20.329050 23 55 02.865 -02 38 47.30 23.5G 21TH192 G37 C~98Th 2025 09 20.368840 23 55 02.688 -02 38 48.43 21TH192 G37 C~98Th
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 0.04 0.00 0.02
2 0.0005 0.00 -0.04 0.00 -0.03
3 1.1329 0.00 0.01 0.00 0.03
4 1.1334 0.00 -0.02 0.00 -0.01
5 2.0420 0.00 0.03 0.00 0.00
6 2.0423 0.00 0.00 0.00 -0.09
7 2.0941 0.00 0.03 0.00 0.04
8 2.0941 0.00 0.01 0.00 -0.06
9 2.0943 0.00 -0.06 0.00 0.04
10 2.0943 0.00 -0.08 0.00 0.03
11 6.0619 0.00 -0.04 0.00 -0.02
12 6.0620 0.00 0.04 0.00 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.
21TH192 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.069 43.069 43.069 ecceobj 0.042 0.042 0.042 incobj 1.894 1.894 1.894 qmin 39.973 40.005 39.972 qmax 46.125 46.167 46.180 amean 42.969 42.970 42.968 amin 42.640 42.643 42.634 amax 43.316 43.314 43.317 emean 0.048 0.048 0.048 emin 0.025 0.025 0.025 emax 0.065 0.066 0.066 imean 1.028 1.027 1.028 imin 0.526 0.526 0.526 imax 1.503 1.500 1.502 excite_mean 0.051 0.052 0.051 fracstop 1.000 1.000 1.000 cjmean 3.086 3.086 3.086 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 181.7 181.5 181.6 kozaiamp 180.0 179.9 180.0