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: 01UN18 # Created Sun Dec 22 02:08:19 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 15 observations of 15 # Arc: 11.96y # First observation: 2001/10/19 # Last observation: 2013/10/06 # Chi-squared of fit: 12.68 DOF: 24 RMS: 0.16 # Min/Max residuals: -0.34 0.33 # Exact a, adot, b, bdot, g, gdot: 1.552942E-05 1.980909E-02 -1.168235E-07 1.245079E-03 2.204998E-02 1.089477E-03 # Covariance matrix: 3.4402E-13 -6.0013E-14 1.7638E-15 -1.4125E-15 5.6040E-13 -9.3722E-14 -6.0013E-14 1.3116E-13 -1.1880E-14 9.0776E-15 9.2545E-13 6.0404E-13 1.7638E-15 -1.1880E-14 2.1597E-13 -2.5355E-14 -9.8138E-14 -5.7945E-14 -1.4125E-15 9.0776E-15 -2.5355E-14 5.7704E-15 7.4540E-14 4.4234E-14 5.6040E-13 9.2545E-13 -9.8138E-14 7.4540E-14 1.2453E-11 4.9619E-12 -9.3722E-14 6.0404E-13 -5.7945E-14 4.4234E-14 4.9619E-12 2.9436E-12 # lat0 lon0 xBary yBary zBary JD0 -0.264647 18.718396 -0.122310 -0.004648 -0.984044 2452201.882423 # Heliocentric elements and errors Epoch: 2452202.5000 = 2001/10/20 Mean Anomaly: 125.82518 +/- 0.303 Argument of Peri: 223.90895 +/- 0.242 Long of Asc Node: 22.98962 +/- 0.000 Inclination: 3.60599 +/- 0.000 Eccentricity: 0.06966135 +/- 0.0003 Semi-Major Axis: 44.39629798 +/- 0.0250 Time of Perihelion: 2414438.0109 +/- 96.2 Perihelion: 41.30359184 +/- 0.0272 Aphelion: 47.48900413 +/- 0.0303 Period (y) 295.8205 +/- 0.25 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 43.84699203 +/- 0.0069 Ecliptic Y 14.99181017 +/- 0.0023 Ecliptic Z -0.20947618 +/- 0.0000 Ecliptic XDOT -0.00066921 +/- 0.0000 Ecliptic YDOT 0.00237373 +/- 0.0000 Ecliptic ZDOT 0.00015418 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 46.33954810 +/- 0.0066 Geocenter to KBO 45.35151323 +/- 0.0073 # Hcoef: 6.46
The following table shows the complete astrometric record for 01UN18. 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 (01UN18) followed by the observatory code and reference code for the source of the astrometry.
2001 10 19.38168 01 09 28.96 +07 05 21.1 22.7R 01UN18 695 Ce1017 2001 10 19.42429 01 09 28.81 +07 05 19.8 01UN18 695 Ce1017 2001 10 20.37617 01 09 24.85 +07 04 56.5 01UN18 695 Ce1017 2002 11 07.13992 01 12 22.56 +07 27 51.6 22.8R 01UN18 695 Cj4622 2002 11 07.24749 01 12 22.14 +07 27 49.2 01UN18 695 Cj4622 2003 10 23.15737 01 17 30.12 +08 03 14.7 22.5R 01UN18 695 Cj4622 2003 10 23.25280 01 17 29.73 +08 03 12.4 01UN18 695 Cj4622 2005 10 27.45539 01 25 23.97 +08 59 35.1 23.0R 01UN18 568 Cp1907 2005 10 27.49229 01 25 23.82 +08 59 34.2 01UN18 568 Cp1907 2008 11 01.385062 01 37 24.53 +10 23 14.7 22.9V 01UN18 645 C~2Jx5 2008 11 01.385891 01 37 24.54 +10 23 14.7 22.7V 01UN18 645 C~2Jx5 2008 11 01.388379 01 37 24.54 +10 23 14.8 23.5V 01UN18 645 C~2Jx5 2013 10 05.42240 02 00 06.17 +12 51 19.3 23.2R 01UN18 695 C~0zdE 2013 10 05.48612 02 00 05.92 +12 51 18.2 01UN18 695 C~0zdE 2013 10 06.43442 02 00 02.11 +12 50 58.3 01UN18 695 C~0zdE
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 -0.33 0.00 0.09
2 0.0001 0.00 0.10 0.00 -0.16
3 0.0027 0.00 -0.07 0.00 -0.11
4 1.0507 0.00 0.15 0.00 0.12
5 1.0510 0.00 -0.01 0.00 0.06
6 2.0090 0.00 0.00 0.00 0.12
7 2.0092 0.00 0.19 0.00 0.13
8 4.0221 0.00 -0.05 0.00 0.13
9 4.0222 0.00 0.02 0.00 0.11
10 7.0363 0.00 -0.16 0.00 -0.34
11 7.0363 0.00 0.05 0.00 -0.32
12 7.0363 0.00 0.20 0.00 -0.17
13 11.9618 0.00 -0.10 0.00 0.11
14 11.9620 0.00 0.03 0.00 0.33
15 11.9646 0.00 -0.01 0.00 -0.08
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.
01UN18 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.588 44.588 44.588 ecceobj 0.069 0.069 0.069 incobj 3.596 3.596 3.596 qmin 40.459 40.424 40.451 qmax 48.395 48.444 48.384 amean 44.300 44.297 44.295 amin 43.953 43.938 43.947 amax 44.666 44.673 44.676 emean 0.069 0.069 0.069 emin 0.053 0.052 0.052 emax 0.084 0.085 0.083 imean 3.408 3.407 3.407 imin 2.702 2.703 2.704 imax 3.957 3.956 3.956 excite_mean 0.091 0.091 0.091 fracstop 1.000 1.000 1.000 cjmean 3.095 3.095 3.095 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 182.2 182.0 181.9 kozaiamp 179.9 179.9 179.9