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: 21DM19 # Created Tue Apr 1 01:11:24 2025 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 1.20y # First observation: 2021/02/16 # Last observation: 2022/04/29 Preliminary a, adot, b, bdot, g, gdot: 0.000023 0.014403 0.000010 0.007463 0.018643 0.000000 # Chi-squared of fit: 7.34 DOF: 14 RMS: 0.15 # Min/Max residuals: -0.31 0.25 # Exact a, adot, b, bdot, g, gdot: 1.159645E-05 1.457645E-02 5.311177E-06 7.622161E-03 1.867398E-02 8.316828E-03 # Covariance matrix: 6.8582E-13 1.2666E-12 -6.1265E-14 1.1542E-12 2.1340E-12 1.3033E-10 1.2666E-12 1.8859E-11 -7.1167E-13 1.4780E-11 1.4350E-11 1.6540E-09 -6.1265E-14 -7.1167E-13 4.2259E-13 -9.4343E-13 -5.4477E-13 -6.4552E-11 1.1542E-12 1.4780E-11 -9.4343E-13 1.2666E-11 1.0619E-11 1.3546E-09 2.1340E-12 1.4350E-11 -5.4477E-13 1.0619E-11 1.6268E-11 1.1952E-09 1.3033E-10 1.6540E-09 -6.4552E-11 1.3546E-09 1.1952E-09 1.5145E-07 # lat0 lon0 xBary yBary zBary JD0 -2.460901 119.931645 -0.460083 -0.038067 -0.883581 2459261.734711 # Heliocentric elements and errors Epoch: 2459260.5000 = 2021/02/15 Mean Anomaly: 27.27363 +/- 1.644 Argument of Peri: 270.51218 +/- 0.282 Long of Asc Node: 124.99101 +/- 0.002 Inclination: 27.91384 +/- 0.009 Eccentricity: 0.54882868 +/- 0.0248 Semi-Major Axis: 82.12615337 +/- 3.1697 Time of Perihelion: 2438665.5358 +/- 345.8 Perihelion: 37.05296464 +/- 2.4885 Aphelion: 127.19934210 +/- 5.3150 Period (y) 744.2698 +/- 43.09 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -27.52882756 +/- 0.0057 Ecliptic Y 46.89601705 +/- 0.0100 Ecliptic Z -2.29906746 +/- 0.0005 Ecliptic XDOT -0.00247733 +/- 0.0000 Ecliptic YDOT 0.00003719 +/- 0.0000 Ecliptic ZDOT 0.00106391 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 54.42755252 +/- 0.0091 Geocenter to KBO 53.55045858 +/- 0.0116 # Hcoef: 7.55
The following table shows the complete astrometric record for 21DM19. 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 (21DM19) followed by the observatory code and reference code for the source of the astrometry.
2021 02 16.23391 08 06 15.334 +17 45 31.50 24.8r 21DM19 568 C~6DKf 2021 02 16.39836 08 06 14.749 +17 45 34.22 24.8r 21DM19 568 C~6DKf 2021 03 17.10914 08 04 56.259 +17 52 31.75 25.0r 21DM19 304 C~6DKf 2021 03 18.06539 08 04 54.491 +17 52 43.39 25.0r 21DM19 304 C~6DKf 2022 03 07.05892 08 09 05.197 +18 05 10.87 24.8G 21DM19 304 C~6DKf 2022 03 07.06934 08 09 05.157 +18 05 11.11 24.8G 21DM19 304 C~6DKf 2022 03 07.14765 08 09 04.964 +18 05 12.32 24.8G 21DM19 304 C~6DKf 2022 03 07.15812 08 09 04.920 +18 05 12.35 24.8G 21DM19 304 C~6DKf 2022 04 28.98163 08 08 24.840 +18 12 51.58 25.0r 21DM19 304 C~6DKf 2022 04 29.98116 08 08 26.065 +18 12 54.09 24.7r 21DM19 304 C~6DKf
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 0.15 0.00 0.24
2 0.0005 -8.74 0.04 0.92 0.25
3 0.0791 -1191.88 -0.11 176.73 -0.18
4 0.0817 -1218.98 -0.07 182.90 -0.31
5 1.0509 2122.25 0.05 1662.83 -0.13
6 1.0509 2121.64 -0.14 1662.95 -0.08
7 1.0511 2118.69 0.01 1663.55 0.08
8 1.0511 2118.07 -0.20 1663.44 -0.08
9 1.1958 1462.46 0.07 1991.35 0.16
10 1.1985 1478.99 0.19 1997.49 0.06
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.
21DM19 quality flag:1 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 84.014 94.744 76.259 ecceobj 0.557 0.622 0.491 incobj 27.817 27.843 27.790 qmin 36.474 34.799 38.072 qmax 132.007 155.356 114.582 amean 82.881 93.079 75.328 amin 81.650 91.494 74.326 amax 84.667 95.520 76.704 emean 0.543 0.608 0.477 emin 0.527 0.592 0.460 emax 0.559 0.626 0.494 imean 26.915 27.149 26.812 imin 26.193 26.119 26.155 imax 27.909 28.269 27.615 excite_mean 0.707 0.760 0.656 fracstop 1.000 1.000 1.000 cjmean 2.847 2.808 2.881 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 168.3 183.6 164.3 kozaiamp 180.0 180.0 180.0