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: 21DN15 # Created Wed Jul 17 01:11:49 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 18 observations of 18 # Arc: 7.99y # First observation: 2016/01/13 # Last observation: 2024/01/10 # Chi-squared of fit: 33.94 DOF: 30 RMS: 0.24 # Min/Max residuals: -0.50 0.44 # Exact a, adot, b, bdot, g, gdot: 1.421584E-05 2.355600E-02 8.412706E-07 1.115027E-03 2.407094E-02 9.887533E-04 # Covariance matrix: 1.2493E-12 -4.4461E-13 2.9321E-14 -1.5884E-14 -1.5232E-13 -1.5638E-12 -4.4461E-13 2.4548E-13 -2.0779E-14 1.1049E-14 2.3005E-13 1.0845E-12 2.9321E-14 -2.0779E-14 6.3221E-13 -1.1121E-13 -2.4323E-14 -1.0182E-13 -1.5884E-14 1.1049E-14 -1.1121E-13 2.2700E-14 1.2457E-14 5.3994E-14 -1.5232E-13 2.3005E-13 -2.4323E-14 1.2457E-14 5.4928E-13 1.2151E-12 -1.5638E-12 1.0845E-12 -1.0182E-13 5.3994E-14 1.2151E-12 5.2973E-12 # lat0 lon0 xBary yBary zBary JD0 -0.867644 115.814220 0.065646 -0.014634 -0.981220 2457400.720638 # Heliocentric elements and errors Epoch: 2457400.5000 = 2016/01/13 Mean Anomaly: 42.65557 +/- 0.091 Argument of Peri: 295.50354 +/- 0.106 Long of Asc Node: 133.13167 +/- 0.001 Inclination: 2.83253 +/- 0.000 Eccentricity: 0.05415591 +/- 0.0001 Semi-Major Axis: 44.22351278 +/- 0.0046 Time of Perihelion: 2444672.7532 +/- 27.2 Perihelion: 41.82854802 +/- 0.0054 Aphelion: 46.61847754 +/- 0.0058 Period (y) 294.0953 +/- 0.05 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -18.46089882 +/- 0.0006 Ecliptic Y 38.30419298 +/- 0.0011 Ecliptic Z -0.62911432 +/- 0.0000 Ecliptic XDOT -0.00246245 +/- 0.0000 Ecliptic YDOT -0.00107068 +/- 0.0000 Ecliptic ZDOT 0.00012513 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 42.52540041 +/- 0.0011 Geocenter to KBO 41.54386872 +/- 0.0013 # Hcoef: 6.61
The following table shows the complete astrometric record for 21DN15. 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 (21DN15) followed by the observatory code and reference code for the source of the astrometry.
2016 01 13.219849 07 50 30.76 +20 07 47.5 22.2r 21DN15 W84 C~5zHK 2019 03 04.011701 08 03 40.96 +19 43 32.7 21.9z 21DN15 W84 C~5zHK 2019 03 04.051577 08 03 40.83 +19 43 33.3 23.4g 21DN15 W84 C~5zHK 2019 03 05.029731 08 03 37.54 +19 43 44.4 23.3g 21DN15 W84 C~5zHK 2019 12 10.341353 08 15 32.49 +19 09 59.9 22.3i 21DN15 W84 C~5zHK 2020 02 26.116084 08 09 38.30 +19 29 22.7 23.1V 21DN15 W84 C~5zHK 2021 02 17.24311 08 15 45.786 +19 13 51.95 23.0r 21DN15 568 C~5Jzg 2021 02 17.41616 08 15 45.009 +19 13 54.62 23.1r 21DN15 568 C~5Jzg 2021 03 09.05900 08 14 30.144 +19 18 17.04 23.2G 21DN15 304 C~5Jzg 2021 03 09.11190 08 14 29.976 +19 18 17.81 23.3G 21DN15 304 C~5Jzg 2021 03 17.11811 08 14 07.323 +19 19 40.21 23.2r 21DN15 304 C~5Jzg 2021 03 18.07424 08 14 04.976 +19 19 48.98 23.2r 21DN15 304 C~5Jzg 2021 04 12.01690 08 13 32.848 +19 22 04.88 23.3r 21DN15 304 C~5Jzg 2021 12 06.27663 08 26 44.035 +18 40 28.78 23.2r 21DN15 304 C~5Jzg 2021 12 07.29342 08 26 41.090 +18 40 39.63 23.3r 21DN15 304 C~5Jzg 2024 01 10.73582 08 35 24.44 +18 17 43.4 22.6w 21DN15 O18 C~7gyj 2024 01 10.74449 08 35 24.35 +18 17 43.9 23.2w 21DN15 O18 C~7gyj 2024 01 10.75323 08 35 24.35 +18 17 43.5 22.2w 21DN15 O18 C~7gyj
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 0.27 0.00 -0.07
2 3.1370 0.00 -0.32 0.00 0.17
3 3.1371 0.00 -0.20 0.00 0.32
4 3.1398 0.00 -0.35 0.00 0.44
5 3.9072 0.00 -0.08 0.00 0.05
6 4.1202 0.00 0.19 0.00 -0.17
7 5.0979 0.00 0.11 0.00 -0.08
8 5.0984 0.00 0.06 0.00 -0.06
9 5.1522 0.00 -0.02 0.00 -0.37
10 5.1523 0.00 0.03 0.00 -0.20
11 5.1743 0.00 0.14 0.00 -0.24
12 5.1769 0.00 0.17 0.00 -0.21
13 5.2452 0.00 0.02 0.00 -0.42
14 5.8975 0.00 0.00 0.00 -0.03
15 5.9003 0.00 0.27 0.00 0.43
16 7.9932 0.00 0.23 0.00 0.09
17 7.9932 0.00 -0.50 0.00 0.43
18 7.9932 0.00 0.12 0.00 -0.12
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.
21DN15 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.287 44.287 44.287 ecceobj 0.059 0.059 0.059 incobj 2.840 2.840 2.840 qmin 40.523 40.522 40.525 qmax 47.902 47.895 47.887 amean 44.101 44.100 44.100 amin 43.751 43.751 43.751 amax 44.472 44.468 44.466 emean 0.061 0.061 0.061 emin 0.046 0.046 0.046 emax 0.077 0.077 0.077 imean 2.113 2.113 2.113 imin 1.430 1.430 1.430 imax 2.772 2.772 2.771 excite_mean 0.072 0.072 0.072 fracstop 1.000 1.000 1.000 cjmean 3.097 3.097 3.097 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 189.4 189.4 189.4 kozaiamp 179.9 179.9 179.9