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: 181855
# Created Sat Nov 23 02:06:59 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 35 observations of 35
# Arc: 22.15y
# First observation: 1998/11/18
# Last observation: 2021/01/11
# Chi-squared of fit: 79.51 DOF: 64 RMS: 0.27
# Min/Max residuals: -0.77 0.70
# Exact a, adot, b, bdot, g, gdot:
1.425259E-05 2.490896E-02 6.369456E-06 1.362452E-02 2.635905E-02 -2.951405E-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
1.411798 43.810608 -0.207891 0.023465 -0.961996 2451135.620281
# Heliocentric elements and errors
Epoch: 2451136.5000 = 1998/11/19
Mean Anomaly: 334.58814 +/- 0.000
Argument of Peri: 39.78947 +/- 0.000
Long of Asc Node: 41.58298 +/- 0.000
Inclination: 28.61544 +/- 0.000
Eccentricity: 0.18641646 +/- 0.0000
Semi-Major Axis: 46.31401904 +/- 0.0000
Time of Perihelion: 2459262.9525 +/- 0.0
Perihelion: 37.68032356 +/- 0.0000
Aphelion: 54.94771453 +/- 0.0000
Period (y) 315.1932 +/- 0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 27.92720090 +/- 0.0000
Ecliptic Y 27.07124269 +/- 0.0000
Ecliptic Z 0.93497308 +/- 0.0000
Ecliptic XDOT -0.00203799 +/- 0.0000
Ecliptic YDOT 0.00163984 +/- 0.0000
Ecliptic ZDOT 0.00140713 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 38.90578106 +/- 0.0000
Geocenter to KBO 37.93772437 +/- 0.0000
# Hcoef: 7.70
The following table shows the complete astrometric record for 181855. 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 (181855) followed by the observatory code and reference code for the source of the astrometry.
1998 11 18.11955 02 43 38.73 +17 19 52.0 22.6R 181855 695 a3608 1998 11 18.18843 02 43 38.36 +17 19 50.7 181855 695 a3608 1998 11 18.27206 02 43 37.91 +17 19 49.2 181855 695 a3608 1998 12 17.93517 02 41 18.13 +17 12 39.5 22.9R 181855 950 a3608 1998 12 17.97547 02 41 17.97 +17 12 39.3 181855 950 a3608 1998 12 18.01794 02 41 17.78 +17 12 38.4 181855 950 a3608 1999 11 30.20597 02 47 23.35 +18 27 08.3 22.5R 181855 695 Cc3588 1999 11 30.21307 02 47 23.31 +18 27 08.2 181855 695 Cc3588 1999 11 30.33792 02 47 22.67 +18 27 06.2 22.3R 181855 695 Cc3588 1999 11 30.34501 02 47 22.64 +18 27 06.2 22.3R 181855 695 Cc3588 2000 12 21.32043 02 50 35.99 +19 32 23.3 181855 568 Cc3588 2000 12 21.41583 02 50 35.65 +19 32 22.1 181855 568 Cc3588 2000 12 22.29839 02 50 32.35 +19 32 11.7 181855 568 Cc3588 2002 11 05.42689 03 04 33.87 +22 04 23.9 22.9R 181855 568 Cl8244 2002 11 05.48447 03 04 33.55 +22 04 23.1 181855 568 Cl8244 2002 11 06.49798 03 04 27.71 +22 04 08.6 181855 568 Cl8244 2007 09 16.48930 03 35 22.18 +27 46 54.6 181855 675 Cy6664 2007 09 17.42275 03 35 20.01 +27 47 06.2 23.8R 181855 675 Cy6664 2007 09 17.50186 03 35 19.84 +27 47 07.6 23.9R 181855 675 Cy6664 2008 03 03.12511 03 25 51.33 +27 27 24.8 181855 695 Cy7583 2008 03 04.12070 03 25 54.39 +27 27 29.8 181855 695 Cy7583 2008 03 05.11459 03 25 57.55 +27 27 34.8 181855 695 Cy7583 2008 09 20.85310 03 40 55.52 +28 53 42.7 24.9R 181855 250 S~06I2 2008 09 20.85935 03 40 55.52 +28 53 43.0 181855 250 S~06I2 2008 09 20.87254 03 40 55.48 +28 53 43.1 181855 250 S~06I2 2008 11 16.59471 03 36 15.56 +28 53 58.4 181855 250 S~06I2 2008 11 16.60166 03 36 15.52 +28 53 58.3 181855 250 S~06I2 2008 11 16.60791 03 36 15.48 +28 53 58.2 181855 250 S~06I2 2008 11 16.61485 03 36 15.44 +28 53 58.1 181855 250 S~06I2 2017 12 20.31068 04 32 02.656 +38 13 46.57 23.3R 181855 G37 C~2VMM 2017 12 20.38478 04 32 02.195 +38 13 45.60 181855 G37 C~2VMM 2017 12 20.43855 04 32 01.819 +38 13 44.66 181855 G37 C~2VMM 2021 01 11.273630 04 52 41.937 +40 52 23.65 24.2G 181855 G37 C~4X2D 2021 01 11.319620 04 52 41.660 +40 52 22.75 181855 G37 C~4X2D 2021 01 11.364400 04 52 41.404 +40 52 21.43 181855 G37 C~4X2D
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 0.03 0.00 0.40
2 0.0002 0.00 0.09 0.00 0.23
3 0.0004 0.00 0.17 0.00 0.12
4 0.0816 0.00 0.23 0.00 0.06
5 0.0817 0.00 0.18 0.00 0.31
6 0.0819 0.00 -0.20 0.00 -0.11
7 1.0324 0.00 -0.14 0.00 -0.22
8 1.0324 0.00 -0.19 0.00 -0.21
9 1.0328 0.00 -0.20 0.00 -0.24
10 1.0328 0.00 -0.11 0.00 -0.13
11 2.0923 0.00 -0.28 0.00 0.04
12 2.0925 0.00 0.12 0.00 -0.02
13 2.0949 0.00 -0.35 0.00 -0.10
14 3.9652 0.00 0.14 0.00 0.03
15 3.9654 0.00 0.37 0.00 0.04
16 3.9682 0.00 -0.02 0.00 -0.21
17 8.8278 0.00 0.24 0.00 -0.53
18 8.8304 0.00 0.17 0.00 -0.77
19 8.8306 0.00 0.55 0.00 -0.36
20 9.2895 0.00 -0.06 0.00 0.01
21 9.2923 0.00 0.06 0.00 0.27
22 9.2950 0.00 0.15 0.00 0.10
23 9.8418 0.00 -0.33 0.00 0.48
24 9.8419 0.00 -0.07 0.00 0.70
25 9.8419 0.00 -0.14 0.00 0.63
26 9.9972 0.00 -0.25 0.00 0.04
27 9.9972 0.00 -0.20 0.00 0.02
28 9.9972 0.00 -0.22 0.00 -0.01
29 9.9972 0.00 -0.17 0.00 -0.04
30 19.0888 0.00 0.05 0.00 0.10
31 19.0890 0.00 0.56 0.00 0.12
32 19.0892 0.00 0.27 0.00 -0.10
33 22.1496 0.00 -0.05 0.00 0.16
34 22.1498 0.00 -0.27 0.00 0.13
35 22.1499 0.00 -0.29 0.00 -0.34
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.
181855 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 46.420 46.420 46.420 ecceobj 0.189 0.189 0.189 incobj 28.600 28.600 28.600 qmin 36.799 36.799 36.799 qmax 55.673 55.672 55.674 amean 46.041 46.042 46.040 amin 45.643 45.650 45.652 amax 46.486 46.495 46.487 emean 0.182 0.182 0.182 emin 0.165 0.166 0.166 emax 0.198 0.198 0.198 imean 27.943 27.942 27.944 imin 27.562 27.568 27.570 imax 28.328 28.329 28.319 excite_mean 0.503 0.503 0.503 fracstop 1.000 1.000 1.000 cjmean 2.803 2.803 2.803 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 167.7 167.6 167.6 kozaiamp 179.9 179.9 179.9