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: 500887
# Created Tue Apr 1 01:07:10 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 32 observations of 32
# Arc: 3.12y
# First observation: 2013/04/19
# Last observation: 2016/06/03
# Chi-squared of fit: 19.10 DOF: 58 RMS: 0.14
# Min/Max residuals: -0.24 0.57
# Exact a, adot, b, bdot, g, gdot:
1.642884E-05 2.563687E-02 1.690121E-06 2.125468E-03 2.537902E-02 -1.323484E-03
# Covariance matrix:
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
# lat0 lon0 xBary yBary zBary JD0
8.914846 -123.375099 0.457649 0.138892 -0.885387 2456402.058538
# Heliocentric elements and errors
Epoch: 2456402.5000 = 2013/04/20
Mean Anomaly: 310.84997 +/- 0.000
Argument of Peri: 117.53468 +/- 0.000
Long of Asc Node: 175.12742 +/- 0.000
Inclination: 9.95899 +/- 0.000
Eccentricity: 0.07773987 +/- 0.0000
Semi-Major Axis: 42.28048595 +/- 0.0000
Time of Perihelion: 2470112.2533 +/- 0.0
Perihelion: 38.99360636 +/- 0.0000
Aphelion: 45.56736554 +/- 0.0000
Period (y) 274.9275 +/- 0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -22.28827683 +/- 0.0000
Ecliptic Y -33.00158047 +/- 0.0000
Ecliptic Z 6.10619360 +/- 0.0000
Ecliptic XDOT 0.00240040 +/- 0.0000
Ecliptic YDOT -0.00137373 +/- 0.0000
Ecliptic ZDOT 0.00020454 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 40.28846405 +/- 0.0000
Geocenter to KBO 39.40267751 +/- 0.0000
# Hcoef: 8.19
The following table shows the complete astrometric record for 500887. 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 (500887) followed by the observatory code and reference code for the source of the astrometry.
2013 04 19.55776 15 45 40.432 -10 43 07.23 24.4r 500887 568 C~1XRg 2013 05 04.43834 15 44 33.821 -10 37 48.77 24.3r 500887 568 C~1XRg 2013 05 04.44379 15 44 33.795 -10 37 49.02 500887 568 C~1XRg 2013 05 07.43599 15 44 19.514 -10 36 48.03 24.5r 500887 568 C~1XRg 2013 05 07.48020 15 44 19.306 -10 36 47.02 24.3r 500887 568 C~1XRg 2013 05 07.52039 15 44 19.097 -10 36 46.12 24.3r 500887 568 C~1XRg 2013 05 09.48057 15 44 09.641 -10 36 07.13 23.9r 500887 568 C~1XRg 2013 05 10.48774 15 44 04.757 -10 35 47.29 24.7r 500887 568 C~1XRg 2013 06 01.40276 15 42 17.775 -10 29 33.24 24.1r 500887 568 C~1XRg 2013 06 01.40895 15 42 17.704 -10 29 33.03 24.1r 500887 568 C~1XRg 2013 06 02.40261 15 42 12.974 -10 29 19.04 24.5r 500887 568 C~1XRg 2014 02 24.63155 15 53 26.682 -11 12 39.41 24.1r 500887 568 C~2LSW 2014 02 28.60816 15 53 27.877 -11 11 43.28 24.4r 500887 568 C~2LSW 2014 03 06.53575 15 53 26.637 -11 10 11.27 24.1r 500887 568 C~1XRg 2014 04 04.52511 15 52 32.532 -11 00 53.73 23.7r 500887 568 C~2LSW 2014 04 30.39739 15 50 51.003 -10 51 40.54 24.1r 500887 568 C~1XRg 2014 04 30.44891 15 50 50.769 -10 51 39.62 24.1r 500887 568 C~1XRg 2014 04 30.50065 15 50 50.519 -10 51 38.51 24.3r 500887 568 C~1XRg 2014 05 05.45039 15 50 27.466 -10 49 57.44 24.2r 500887 568 C~1XRg 2014 05 06.39222 15 50 22.992 -10 49 38.72 24.1r 500887 568 C~1XRg 2014 05 06.45909 15 50 22.668 -10 49 37.29 24.3r 500887 568 C~1XRg 2014 05 06.51006 15 50 22.423 -10 49 36.32 23.9r 500887 568 C~1XRg 2014 05 06.53514 15 50 22.299 -10 49 35.77 24.4r 500887 568 C~1XRg 2014 05 22.50235 15 49 04.247 -10 44 41.14 500887 568 C~1XRg 2014 05 24.47488 15 48 54.523 -10 44 09.12 23.9r 500887 568 C~1XRg 2014 06 02.45717 15 48 10.695 -10 41 55.03 23.8r 500887 568 C~1XRg 2014 07 01.36375 15 46 07.995 -10 37 43.98 23.8r 500887 568 C~1XRg 2014 07 18.33716 15 45 19.402 -10 37 45.41 24.3r 500887 568 C~1XRg 2015 03 22.60347 15 59 02.221 -11 17 08.03 24.1r 500887 568 C~1XRg 2015 08 11.30815 15 50 43.753 -10 53 07.44 24.3r 500887 568 C~2LSW 2016 05 29.38457 16 00 28.138 -11 06 43.65 24.2w 500887 568 C~2LSW 2016 06 03.42470 16 00 03.390 -11 05 36.19 24.3w 500887 568 C~2LSW
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 -0.05
2 0.0407 0.00 -0.10 0.00 0.16
3 0.0408 0.00 -0.09 0.00 -0.20
4 0.0489 0.00 -0.08 0.00 -0.13
5 0.0491 0.00 0.05 0.00 -0.01
6 0.0492 0.00 -0.14 0.00 0.08
7 0.0545 0.00 -0.06 0.00 -0.03
8 0.0573 0.00 0.04 0.00 -0.02
9 0.1173 0.00 0.57 0.00 -0.22
10 0.1173 0.00 -0.04 0.00 -0.10
11 0.1200 0.00 -0.14 0.00 0.02
12 0.8517 0.00 -0.04 0.00 -0.01
13 0.8626 0.00 0.10 0.00 -0.01
14 0.8788 0.00 -0.07 0.00 -0.09
15 0.9582 0.00 -0.24 0.00 0.03
16 1.0290 0.00 -0.04 0.00 0.17
17 1.0291 0.00 0.05 0.00 0.03
18 1.0293 0.00 -0.08 0.00 0.07
19 1.0428 0.00 0.17 0.00 0.09
20 1.0454 0.00 0.06 0.00 -0.04
21 1.0456 0.00 0.06 0.00 0.06
22 1.0457 0.00 0.09 0.00 0.02
23 1.0458 0.00 0.06 0.00 0.07
24 1.0895 0.00 0.01 0.00 0.45
25 1.0949 0.00 0.18 0.00 0.04
26 1.1195 0.00 -0.03 0.00 -0.07
27 1.1986 0.00 0.10 0.00 0.15
28 1.2451 0.00 -0.08 0.00 -0.10
29 1.9221 0.00 0.20 0.00 -0.18
30 2.3101 0.00 -0.12 0.00 -0.01
31 3.1097 0.00 0.01 0.00 -0.05
32 3.1235 0.00 -0.15 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.
500887 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 42.160 42.160 42.160 ecceobj 0.079 0.079 0.079 incobj 9.978 9.978 9.978 qmin 35.614 35.572 35.761 qmax 49.683 49.723 49.651 amean 42.385 42.474 42.371 amin 41.814 41.805 41.803 amax 42.926 42.895 42.923 emean 0.110 0.113 0.108 emin 0.070 0.070 0.070 emax 0.158 0.161 0.157 imean 10.064 10.056 10.073 imin 8.576 8.515 8.599 imax 11.588 11.583 11.588 excite_mean 0.207 0.209 0.206 fracstop 1.000 1.000 1.000 cjmean 3.033 3.033 3.033 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 183.5 182.7 180.7 kozaiamp 179.9 179.9 180.0