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: 17DP121
# Created Sun Nov 24 02:10:48 2024
# Orbit generated from Bernstein formalism
# Fitting 12 observations of 12
# Arc: 1.06y
# First observation: 2017/02/24
# Last observation: 2018/03/17
Preliminary a, adot, b, bdot, g, gdot:
-0.000010 0.011999 0.000000 0.002138 0.016776 0.000000
# Chi-squared of fit: 11.07 DOF: 18 RMS: 0.17
# Min/Max residuals: -0.45 0.32
# Exact a, adot, b, bdot, g, gdot:
1.067231E-05 1.206516E-02 1.810570E-06 2.153303E-03 1.686202E-02 7.068685E-03
# Covariance matrix:
6.7660E-13 1.1569E-12 -1.1588E-14 4.2120E-13 1.4823E-12 1.8148E-10
1.1569E-12 4.8328E-11 -7.3499E-13 1.3486E-11 2.1379E-11 5.6399E-09
-1.1588E-14 -7.3499E-13 2.9666E-13 -4.9666E-13 -3.0309E-13 -8.6374E-11
4.2120E-13 1.3486E-11 -4.9666E-13 4.3243E-12 6.0621E-12 1.5913E-09
1.4823E-12 2.1379E-11 -3.0309E-13 6.0621E-12 1.1567E-11 2.5481E-09
1.8148E-10 5.6399E-09 -8.6374E-11 1.5913E-09 2.5481E-09 6.6568E-07
# lat0 lon0 xBary yBary zBary JD0
9.814144 166.265604 0.186218 0.165660 -0.956703 2457808.881771
# Heliocentric elements and errors
Epoch: 2457800.5000 = 2017/02/16
Mean Anomaly: 52.84862 +/- 6.274
Argument of Peri: 291.95886 +/- 2.374
Long of Asc Node: 123.13224 +/- 0.034
Inclination: 14.01904 +/- 0.009
Eccentricity: 0.49859373 +/- 0.0499
Semi-Major Axis: 65.30952643 +/- 4.3785
Time of Perihelion: 2429499.9808 +/- 1785.6
Perihelion: 32.74660636 +/- 3.9268
Aphelion: 97.87244650 +/- 7.3249
Period (y) 527.8044 +/- 53.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -57.66841749 +/- 0.0114
Ecliptic Y 14.28068488 +/- 0.0028
Ecliptic Z 10.10877454 +/- 0.0020
Ecliptic XDOT -0.00150265 +/- 0.0001
Ecliptic YDOT -0.00165528 +/- 0.0000
Ecliptic ZDOT 0.00054008 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 60.26418222 +/- 0.0110
Geocenter to KBO 59.30487045 +/- 0.0120
# Hcoef: 7.17
The following table shows the complete astrometric record for 17DP121. 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 (17DP121) followed by the observatory code and reference code for the source of the astrometry.
2017 02 24.38097 11 25 06.820 +14 26 41.05 24.9r 17DP121 568 C~2b81 2017 02 24.58347 11 25 06.150 +14 26 45.85 24.9r 17DP121 568 C~2b81 2017 03 24.13050 11 23 34.948 +14 36 43.90 17DP121 304 C~2b81 2017 03 24.20413 11 23 34.735 +14 36 45.37 17DP121 304 C~2b81 2017 04 20.19888 11 22 16.460 +14 43 05.37 17DP121 G37 C~2b81 2017 04 20.27973 11 22 16.268 +14 43 05.91 17DP121 G37 C~2b81 2018 03 11.20256 11 27 07.478 +14 22 29.36 24.8r 17DP121 304 C~2b81 2018 03 11.27240 11 27 07.243 +14 22 30.67 17DP121 304 C~2b81 2018 03 12.18093 11 27 04.219 +14 22 50.42 17DP121 304 C~2b81 2018 03 12.25842 11 27 03.971 +14 22 52.22 17DP121 304 C~2b81 2018 03 17.206690 11 26 47.54 +14 24 36.7 17DP121 W84 C~3k4S 2018 03 17.208559 11 26 47.52 +14 24 37.0 17DP121 W84 C~3k4S
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 0.13 0.00 0.04
2 0.0006 -10.84 0.07 0.52 -0.02
3 0.0760 -1463.77 -0.45 21.71 0.05
4 0.0762 -1467.19 -0.09 21.83 0.32
5 0.1501 -2660.72 0.07 -80.11 -0.15
6 0.1503 -2663.49 0.27 -80.72 -0.27
7 1.0399 1707.30 0.00 470.54 0.06
8 1.0401 1703.64 0.10 470.37 -0.12
9 1.0426 1655.47 -0.01 470.85 -0.17
10 1.0428 1651.45 0.13 471.05 0.03
11 1.0563 1390.84 0.03 471.08 0.04
12 1.0563 1390.46 -0.26 471.24 0.20
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.
17DP121 quality flag:1 Type: SCATNEAR CENTAURR SCATNEAR axisobj 65.144 83.487 56.129 ecceobj 0.504 0.644 0.372 incobj 14.026 14.051 14.000 qmin 31.924 29.134 34.522 qmax 114.240 144.003 79.921 amean 68.002 82.986 56.205 amin 64.606 78.730 55.296 amax 73.508 87.068 57.494 emean 0.514 0.634 0.366 emin 0.482 0.605 0.348 emax 0.557 0.654 0.390 imean 13.847 14.046 12.876 imin 12.369 12.497 12.086 imax 15.257 16.237 13.640 excite_mean 0.567 0.679 0.429 fracstop 1.000 0.083 1.000 cjmean 2.945 2.857 3.014 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 190.5 320.3 184.0 kozaiamp 179.9 24.9 179.9