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: 21DJ17 # Created Wed Dec 25 02:11:12 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 10 observations of 10 # Arc: 7.26y # First observation: 2015/01/26 # Last observation: 2022/04/30 # Chi-squared of fit: 4.51 DOF: 14 RMS: 0.12 # Min/Max residuals: -0.23 0.16 # Exact a, adot, b, bdot, g, gdot: 9.067110E-06 8.773705E-03 3.650460E-06 4.022981E-03 1.473349E-02 5.303008E-04 # Covariance matrix: 4.8752E-13 -1.4072E-13 2.6937E-15 -3.0015E-14 -1.1808E-13 -1.1265E-12 -1.4072E-13 1.0362E-12 -4.3831E-14 4.9089E-13 1.4475E-12 1.8440E-11 2.6937E-15 -4.3831E-14 4.8487E-13 -9.6473E-14 -4.9088E-14 -8.3385E-13 -3.0015E-14 4.9089E-13 -9.6473E-14 2.6600E-13 5.3734E-13 9.3777E-12 -1.1808E-13 1.4475E-12 -4.9088E-14 5.3734E-13 3.9875E-12 2.0107E-11 -1.1265E-12 1.8440E-11 -8.3385E-13 9.3777E-12 2.0107E-11 3.5251E-10 # lat0 lon0 xBary yBary zBary JD0 -1.091249 128.742554 0.052540 -0.018515 -0.980716 2457048.801258 # Heliocentric elements and errors Epoch: 2457048.5000 = 2015/01/26 Mean Anomaly: 165.14674 +/- 0.330 Argument of Peri: 186.64682 +/- 0.330 Long of Asc Node: 131.05415 +/- 0.000 Inclination: 24.56967 +/- 0.001 Eccentricity: 0.24977750 +/- 0.0003 Semi-Major Axis: 55.33208684 +/- 0.0166 Time of Perihelion: 2388083.0618 +/- 141.1 Perihelion: 41.51137677 +/- 0.0214 Aphelion: 69.15279692 +/- 0.0270 Period (y) 411.5985 +/- 0.18 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -43.04476389 +/- 0.0058 Ecliptic Y 53.72697237 +/- 0.0072 Ecliptic Z -1.29239376 +/- 0.0002 Ecliptic XDOT -0.00134602 +/- 0.0000 Ecliptic YDOT -0.00093778 +/- 0.0000 Ecliptic ZDOT 0.00074565 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 68.85567793 +/- 0.0067 Geocenter to KBO 67.87256887 +/- 0.0092 # Hcoef: 6.66
The following table shows the complete astrometric record for 21DJ17. 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 (21DJ17) followed by the observatory code and reference code for the source of the astrometry.
2015 01 26.300480 08 43 29.29 +17 01 15.8 21DJ17 T09 C~79NK 2015 01 26.328069 08 43 29.20 +17 01 16.1 21DJ17 T09 C~79NK 2015 01 26.404765 08 43 28.93 +17 01 17.1 21DJ17 T09 C~79NK 2021 02 17.26010 08 55 59.573 +17 38 11.26 25.0r 21DJ17 568 C~5fvg 2021 02 17.32935 08 55 59.362 +17 38 12.25 24.7r 21DJ17 568 C~5fvg 2021 04 11.00508 08 54 07.695 +17 47 41.85 25.2r 21DJ17 304 C~5fvg 2021 04 12.02498 08 54 06.835 +17 47 47.05 25.1r 21DJ17 304 C~5fvg 2021 04 13.02748 08 54 06.029 +17 47 52.48 25.3r 21DJ17 304 C~5fvg 2022 04 29.00539 08 56 15.968 +17 53 40.51 25.0r 21DJ17 304 C~5fvg 2022 04 30.00542 08 56 16.117 +17 53 41.41 24.8r 21DJ17 304 C~5fvg
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 0.11 0.00 0.11
2 0.0001 0.00 0.10 0.00 0.01
3 0.0003 0.00 -0.23 0.00 -0.13
4 6.0615 0.00 0.02 0.00 0.10
5 6.0617 0.00 0.04 0.00 0.06
6 6.2059 0.00 0.04 0.00 0.16
7 6.2087 0.00 0.08 0.00 -0.22
8 6.2114 0.00 -0.16 0.00 -0.04
9 7.2545 0.00 0.04 0.00 0.11
10 7.2572 0.00 0.00 0.00 -0.16
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.
21DJ17 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 55.191 55.191 55.191 ecceobj 0.255 0.255 0.255 incobj 24.665 24.665 24.665 qmin 39.667 39.657 39.660 qmax 71.438 71.329 71.397 amean 55.156 55.156 55.156 amin 54.599 54.615 54.568 amax 55.843 55.813 55.826 emean 0.264 0.264 0.264 emin 0.247 0.248 0.247 emax 0.279 0.279 0.279 imean 22.914 22.914 22.914 imin 22.545 22.548 22.538 imax 23.387 23.383 23.386 excite_mean 0.470 0.470 0.470 fracstop 1.000 1.000 1.000 cjmean 2.952 2.952 2.952 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 182.2 182.1 182.2 kozaiamp 180.0 180.0 180.0