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: 17EA58
# Created Mon Apr 28 01:11:08 2025
# Orbit generated from Bernstein formalism
# Fitting 13 observations of 13
# Arc: 2.12y
# First observation: 2017/02/21
# Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
0.000002 0.027762 0.000000 -0.004821 0.026448 0.000000
# Chi-squared of fit: 6.25 DOF: 20 RMS: 0.12
# Min/Max residuals: -0.18 0.33
# Exact a, adot, b, bdot, g, gdot:
1.560230E-05 2.749200E-02 -4.448711E-06 -4.771649E-03 2.627633E-02 -1.100889E-03
# Covariance matrix:
4.9615E-13 4.6438E-12 8.5644E-14 -1.0486E-12 1.7057E-12 1.0535E-10
4.6438E-12 5.1203E-10 1.0178E-11 -1.1352E-10 1.3515E-10 1.1428E-08
8.5644E-14 1.0178E-11 3.5288E-13 -2.3476E-12 2.6747E-12 2.2727E-10
-1.0486E-12 -1.1352E-10 -2.3476E-12 2.5389E-11 -2.9973E-11 -2.5347E-09
1.7057E-12 1.3515E-10 2.6747E-12 -2.9973E-11 3.6374E-11 3.0172E-09
1.0535E-10 1.1428E-08 2.2727E-10 -2.5347E-09 3.0172E-09 2.5518E-07
# lat0 lon0 xBary yBary zBary JD0
6.090146 -164.113825 0.676864 0.076532 -0.715948 2457806.147679
# Heliocentric elements and errors
Epoch: 2457800.5000 = 2017/02/16
Mean Anomaly: 337.19936 +/- 6.107
Argument of Peri: 177.64717 +/- 8.208
Long of Asc Node: 46.15049 +/- 0.008
Inclination: 11.40274 +/- 0.003
Eccentricity: 0.12799574 +/- 0.0083
Semi-Major Axis: 43.82510265 +/- 0.0357
Time of Perihelion: 2464512.1198 +/- 1797.5
Perihelion: 38.21567629 +/- 0.3655
Aphelion: 49.43452902 +/- 0.3664
Period (y) 290.1300 +/- 0.35
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -37.27787503 +/- 0.0084
Ecliptic Y -9.90939452 +/- 0.0024
Ecliptic Z 4.03743157 +/- 0.0009
Ecliptic XDOT 0.00084620 +/- 0.0000
Ecliptic YDOT -0.00274499 +/- 0.0000
Ecliptic ZDOT -0.00050661 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 38.78320410 +/- 0.0081
Geocenter to KBO 38.05706195 +/- 0.0087
# Hcoef: 8.27
The following table shows the complete astrometric record for 17EA58. 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 (17EA58) followed by the observatory code and reference code for the source of the astrometry.
2017 02 21.646878 13 07 53.81 -00 37 34.4 17EA58 T09 C~8AiC 2017 03 06.56598 13 07 07.57 -00 32 00.9 24.3r 17EA58 T09 C~8AiC 2017 03 06.59253 13 07 07.47 -00 32 00.3 24.4r 17EA58 T09 C~8AiC 2017 03 06.63524 13 07 07.29 -00 31 58.9 24.5r 17EA58 T09 C~8AiC 2017 03 29.459413 13 05 25.28 -00 21 10.4 17EA58 T09 C~8AiC 2017 04 26.349730 13 03 11.33 -00 09 08.9 17EA58 T09 C~8AiC 2017 04 26.407962 13 03 11.07 -00 09 07.7 17EA58 T09 C~8AiC 2017 04 29.33613 13 02 57.87 -00 08 05.1 23.6z 17EA58 T09 C~8AiC 2017 04 29.38224 13 02 57.64 -00 08 04.1 23.6z 17EA58 T09 C~8AiC 2017 04 29.39855 13 02 57.57 -00 08 03.8 23.8z 17EA58 T09 C~8AiC 2017 04 29.42279 13 02 57.45 -00 08 03.3 23.9z 17EA58 T09 C~8AiC 2019 04 04.539227 13 15 54.66 -02 02 16.5 17EA58 T09 C~8AiC 2019 04 06.512387 13 15 45.01 -02 01 22.0 17EA58 T09 C~8AiC
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 0.19 0.00 0.33
2 0.0354 -768.40 -0.14 42.75 -0.09
3 0.0354 -770.01 0.02 42.73 -0.17
4 0.0356 -773.04 -0.16 42.99 0.01
5 0.0980 -2434.95 0.07 56.61 -0.06
6 0.1744 -4567.97 -0.01 -45.80 -0.08
7 0.1746 -4572.04 0.17 -46.19 -0.09
8 0.1826 -4779.03 0.19 -64.14 0.11
9 0.1827 -4782.60 -0.11 -64.54 0.04
10 0.1828 -4783.68 -0.04 -64.66 0.03
11 0.1828 -4785.54 -0.18 -64.89 -0.03
12 2.1133 8611.02 0.09 -1940.63 -0.01
13 2.1187 8456.24 -0.09 -1945.48 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.
17EA58 quality flag:2 Type: CLASSICAL SCATNEAR CLASSICAL axisobj 43.286 43.589 43.204 ecceobj 0.118 0.113 0.133 incobj 11.443 11.434 11.449 qmin 37.240 36.664 36.682 qmax 50.064 51.413 50.535 amean 43.538 43.776 43.447 amin 43.172 43.260 43.086 amax 43.927 44.252 43.852 emean 0.121 0.124 0.133 emin 0.103 0.091 0.115 emax 0.140 0.162 0.153 imean 10.029 9.869 9.918 imin 9.192 8.792 8.998 imax 10.928 10.899 11.003 excite_mean 0.212 0.212 0.218 fracstop 1.000 1.000 1.000 cjmean 3.042 3.045 3.038 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 185.6 183.2 183.6 kozaiamp 180.0 180.0 180.0