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: 21DG17
# Created Wed Jul 17 01:11:49 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 17 observations of 17
# Arc: 17.08y
# First observation: 2005/03/12
# Last observation: 2022/04/08
# Chi-squared of fit: 6.29 DOF: 28 RMS: 0.11
# Min/Max residuals: -0.20 0.23
# Exact a, adot, b, bdot, g, gdot:
1.009063E-05 1.007564E-02 -6.415216E-06 -5.819410E-03 1.562635E-02 2.589800E-03
# Covariance matrix:
4.7627E-13 -5.9750E-14 -2.4131E-14 1.8161E-14 -8.1496E-14 -1.8645E-13
-5.9750E-14 3.5172E-14 2.6091E-14 -1.9672E-14 -2.2812E-14 2.0200E-13
-2.4131E-14 2.6091E-14 4.4351E-13 -4.3260E-14 -2.4622E-14 1.6096E-13
1.8161E-14 -1.9672E-14 -4.3260E-14 1.4107E-14 1.8720E-14 -1.2138E-13
-8.1496E-14 -2.2812E-14 -2.4622E-14 1.8720E-14 5.0360E-13 -1.9237E-13
-1.8645E-13 2.0200E-13 1.6096E-13 -1.2138E-13 -1.9237E-13 1.2464E-12
# lat0 lon0 xBary yBary zBary JD0
4.957777 142.956738 -0.474502 0.075140 -0.865091 2453441.714857
# Heliocentric elements and errors
Epoch: 2453442.5000 = 2005/03/13
Mean Anomaly: 87.69520 +/- 0.065
Argument of Peri: 57.36373 +/- 0.039
Long of Asc Node: 331.78374 +/- 0.000
Inclination: 30.34971 +/- 0.000
Eccentricity: 0.22510217 +/- 0.0001
Semi-Major Axis: 62.33645601 +/- 0.0123
Time of Perihelion: 2409651.4958 +/- 34.9
Perihelion: 48.30438428 +/- 0.0104
Aphelion: 76.36852773 +/- 0.0156
Period (y) 492.1771 +/- 0.15
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -51.87173900 +/- 0.0023
Ecliptic Y 38.55085082 +/- 0.0017
Ecliptic Z 5.53010619 +/- 0.0003
Ecliptic XDOT -0.00149452 +/- 0.0000
Ecliptic YDOT -0.00109079 +/- 0.0000
Ecliptic ZDOT -0.00097651 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 64.86451491 +/- 0.0021
Geocenter to KBO 63.99435508 +/- 0.0029
# Hcoef: 4.95
The following table shows the complete astrometric record for 21DG17. 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 (21DG17) followed by the observatory code and reference code for the source of the astrometry.
2005 03 12.214114 09 48 01.73 +18 32 36.0 23.3r 21DG17 645 C~5fvg 2005 03 12.214943 09 48 01.71 +18 32 35.9 22.4i 21DG17 645 C~5fvg 2005 03 12.217431 09 48 01.72 +18 32 35.8 23.8g 21DG17 645 C~5fvg 2015 01 26.491654 10 07 43.06 +13 22 33.1 23.2r 21DG17 568 C~5fvg 2015 01 26.496274 10 07 43.03 +13 22 33.1 23.3r 21DG17 568 C~5fvg 2015 01 26.505516 10 07 43.00 +13 22 33.2 23.1r 21DG17 568 C~5fvg 2017 05 19.248257 10 06 47.72 +12 39 34.1 21DG17 568 C~5fvg 2021 02 17.29607 10 16 10.207 +10 32 34.34 22.9r 21DG17 568 C~5fvg 2021 02 17.36284 10 16 09.984 +10 32 35.25 22.8r 21DG17 568 C~5fvg 2021 04 05.99818 10 13 54.275 +10 42 46.18 23.0r 21DG17 304 C~5fvg 2021 04 07.00063 10 13 52.100 +10 42 55.32 23.2r 21DG17 304 C~5fvg 2021 04 12.20013 10 13 41.542 +10 43 38.13 23.5r 21DG17 304 C~5fvg 2022 03 07.23422 10 16 47.816 +10 08 03.40 23.1G 21DG17 304 C~5fvg 2022 03 07.28016 10 16 47.665 +10 08 04.31 23.4G 21DG17 304 C~5fvg 2022 04 07.98922 10 15 23.515 +10 14 24.33 23.3r 21DG17 304 C~5fvg 2022 04 08.16464 10 15 23.144 +10 14 25.79 22.8r 21DG17 304 C~5fvg 2022 04 08.99013 10 15 21.427 +10 14 33.12 22.8r 21DG17 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 0.06 0.00 0.10
2 0.0000 0.00 -0.20 0.00 -0.01
3 0.0000 0.00 0.06 0.00 -0.14
4 9.8762 0.00 0.23 0.00 0.14
5 9.8762 0.00 -0.01 0.00 0.08
6 9.8762 0.00 -0.04 0.00 0.05
7 12.1863 0.00 -0.06 0.00 -0.14
8 15.9373 0.00 -0.00 0.00 0.00
9 15.9374 0.00 -0.15 0.00 -0.07
10 16.0679 0.00 0.20 0.00 -0.08
11 16.0706 0.00 0.04 0.00 0.04
12 16.0848 0.00 -0.20 0.00 -0.08
13 16.9857 0.00 0.06 0.00 -0.16
14 16.9858 0.00 -0.07 0.00 0.11
15 17.0726 0.00 -0.03 0.00 0.13
16 17.0731 0.00 0.08 0.00 0.01
17 17.0754 0.00 0.08 0.00 -0.01
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.
21DG17 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 62.158 62.158 62.157 ecceobj 0.232 0.232 0.232 incobj 30.489 30.489 30.489 qmin 47.053 47.057 46.993 qmax 77.985 77.988 77.984 amean 62.137 62.137 62.137 amin 61.527 61.532 61.526 amax 62.864 62.854 62.867 emean 0.227 0.227 0.227 emin 0.213 0.214 0.213 emax 0.241 0.241 0.240 imean 31.588 31.588 31.588 imin 31.366 31.369 31.364 imax 31.888 31.879 31.899 excite_mean 0.571 0.571 0.571 fracstop 1.000 1.000 1.000 cjmean 2.868 2.868 2.868 libcent 0 -180.0 -180.0 179.7 libamp 0 -180.0 -180.0 170.6 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 183.6 183.6 183.6 kozaiamp 127.3 127.5 127.5