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: 181874
# Created Tue Dec 31 02:06:54 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 34 observations of 34
# Arc: 24.16y
# First observation: 1999/04/18
# Last observation: 2023/06/15
# Chi-squared of fit: 83.36 DOF: 62 RMS: 0.28
# Min/Max residuals: -0.67 0.72
# Exact a, adot, b, bdot, g, gdot:
1.207582E-05 2.520428E-02 5.773501E-06 7.742721E-03 2.474963E-02 3.852511E-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
2.094668 -155.025301 -0.045838 0.036693 -1.009841 2451286.716693
# Heliocentric elements and errors
Epoch: 2451286.5000 = 1999/04/18
Mean Anomaly: 26.11768 +/- 0.000
Argument of Peri: 323.40083 +/- 0.000
Long of Asc Node: 198.44398 +/- 0.000
Inclination: 17.25565 +/- 0.000
Eccentricity: 0.25251727 +/- 0.0000
Semi-Major Axis: 52.32722937 +/- 0.0000
Time of Perihelion: 2441256.0114 +/- 0.0
Perihelion: 39.11370009 +/- 0.0000
Aphelion: 65.54075865 +/- 0.0000
Period (y) 378.5296 +/- 0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -37.49041413 +/- 0.0000
Ecliptic Y -17.51615495 +/- 0.0000
Ecliptic Z 1.47707273 +/- 0.0000
Ecliptic XDOT 0.00081707 +/- 0.0000
Ecliptic YDOT -0.00268527 +/- 0.0000
Ecliptic ZDOT 0.00087154 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.40676695 +/- 0.0000
Geocenter to KBO 40.40458036 +/- 0.0000
# Hcoef: 6.67
The following table shows the complete astrometric record for 181874. 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 (181874) followed by the observatory code and reference code for the source of the astrometry.
1999 04 18.21595 13 35 38.83 -07 43 05.7 23.3R 181874 695 Ca4930 1999 04 18.28985 13 35 38.47 -07 43 02.9 181874 695 Ca4930 1999 04 18.39569 13 35 38.00 -07 42 59.6 181874 695 Ca4930 1999 05 06.91788 13 34 17.40 -07 33 56.4 181874 950 Ca4930 1999 05 06.98698 13 34 17.08 -07 33 54.6 181874 950 Ca4930 1999 05 07.03852 13 34 16.89 -07 33 53.5 181874 950 Ca4930 1999 06 05.90772 13 32 35.04 -07 22 37.5 22.5R 181874 950 Ca5574 1999 06 05.96142 13 32 34.92 -07 22 37.0 22.3R 181874 950 Ca5574 1999 06 06.02073 13 32 34.79 -07 22 35.8 22.8R 181874 950 Ca5574 2000 03 31.57214 13 42 55.79 -07 58 05.7 23.0R 181874 568 Cb1943 2000 03 31.59545 13 42 55.70 -07 58 05.4 22.9R 181874 568 Cb1943 2000 04 02.59146 13 42 47.13 -07 57 04.7 22.8R 181874 568 Cb1943 2000 04 02.61753 13 42 47.01 -07 57 04.0 22.7R 181874 568 Cb1943 2001 03 10.23447 13 50 16.34 -08 14 07.5 23.0 181874 304 Ce8605 2001 03 10.25463 13 50 16.28 -08 14 06.9 181874 304 Ce8605 2001 03 24.41817 13 49 25.52 -08 07 42.0 22.8R 181874 695 Cc7487 2001 03 24.49355 13 49 25.21 -08 07 40.0 181874 695 Cc7487 2001 03 25.23640 13 49 22.22 -08 07 17.8 20.2 181874 304 Ce8605 2001 03 25.26307 13 49 22.13 -08 07 17.1 181874 304 Ce8605 2002 04 09.46928 13 54 16.50 -08 05 36.5 181874 568 Ch3078 2002 04 09.52236 13 54 16.26 -08 05 34.9 181874 568 Ch3078 2008 03 03.40475 14 31 01.67 -08 48 06.6 181874 695 Cy7583 2008 03 03.51618 14 31 01.41 -08 48 04.0 181874 695 Cy7583 2008 03 04.40158 14 30 59.67 -08 47 45.3 181874 695 Cy7583 2008 03 05.45225 14 30 57.51 -08 47 22.8 181874 695 Cy7583 2008 05 04.30407 14 27 15.93 -08 21 28.9 181874 695 Cz0888 2008 05 04.33091 14 27 15.81 -08 21 28.2 181874 695 Cz0888 2018 04 10.33255 15 22 57.087 -08 51 00.66 23.4R 181874 G37 C~2cER 2018 04 10.40838 15 22 56.804 -08 50 58.77 181874 G37 C~2cER 2019 06 06.243000 15 24 11.849 -08 32 25.97 23.2G 181874 G37 C~38s5 2019 06 06.315580 15 24 11.556 -08 32 24.77 181874 G37 C~38s5 2019 06 06.354290 15 24 11.395 -08 32 24.56 181874 G37 C~38s5 2023 06 15.208350 15 43 38.068 -08 30 23.20 24.2G 181874 G37 C~6w6L 2023 06 15.252140 15 43 37.897 -08 30 22.79 181874 G37 C~6w6L
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 0.72 0.00 -0.46
2 0.0002 0.00 0.37 0.00 0.08
3 0.0005 0.00 0.56 0.00 0.13
4 0.0512 0.00 0.42 0.00 -0.06
5 0.0514 0.00 -0.02 0.00 -0.16
6 0.0515 0.00 0.38 0.00 -0.48
7 0.1333 0.00 -0.61 0.00 0.40
8 0.1335 0.00 -0.33 0.00 0.00
9 0.1336 0.00 0.01 0.00 0.21
10 0.9537 0.00 -0.10 0.00 0.35
11 0.9538 0.00 0.06 0.00 -0.05
12 0.9593 0.00 -0.24 0.00 0.41
13 0.9593 0.00 -0.33 0.00 0.32
14 1.8946 0.00 -0.13 0.00 0.04
15 1.8947 0.00 -0.04 0.00 0.13
16 1.9335 0.00 0.38 0.00 -0.13
17 1.9337 0.00 0.26 0.00 -0.30
18 1.9357 0.00 -0.67 0.00 0.31
19 1.9358 0.00 -0.40 0.00 0.24
20 2.9767 0.00 -0.28 0.00 -0.24
21 2.9769 0.00 -0.34 0.00 -0.22
22 8.8766 0.00 0.22 0.00 -0.22
23 8.8769 0.00 -0.29 0.00 0.03
24 8.8794 0.00 -0.02 0.00 -0.06
25 8.8822 0.00 0.30 0.00 -0.17
26 9.0461 0.00 0.13 0.00 -0.23
27 9.0462 0.00 0.13 0.00 -0.20
28 18.9791 0.00 0.25 0.00 -0.06
29 18.9793 0.00 0.06 0.00 0.01
30 20.1342 0.00 -0.01 0.00 -0.07
31 20.1344 0.00 -0.02 0.00 0.18
32 20.1345 0.00 -0.11 0.00 -0.12
33 24.1588 0.00 -0.08 0.00 0.19
34 24.1589 0.00 -0.11 0.00 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.
181874 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 52.349 52.350 52.349 ecceobj 0.253 0.253 0.253 incobj 17.255 17.255 17.255 qmin 38.133 38.060 38.105 qmax 68.279 68.972 68.266 amean 52.832 52.966 52.836 amin 52.286 52.307 52.292 amax 53.498 53.768 53.467 emean 0.258 0.261 0.259 emin 0.241 0.241 0.242 emax 0.277 0.283 0.278 imean 17.321 17.336 17.320 imin 16.688 16.661 16.628 imax 17.841 17.878 17.854 excite_mean 0.394 0.396 0.394 fracstop 1.000 1.000 1.000 cjmean 3.013 3.013 3.013 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 180.7 184.6 183.6 kozaiamp 180.0 180.0 180.0