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: 18JU6
# Created Sun Nov 24 02:10:53 2024
# Orbit generated from Bernstein formalism
# Fitting 5 observations of 5
# Arc: 0.81y
# First observation: 2018/05/11
# Last observation: 2019/03/01
Preliminary a, adot, b, bdot, g, gdot:
-0.000005 0.012932 -0.000001 -0.000878 0.016432 0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit: 2.62 DOF: 5 RMS: 0.13
# Min/Max residuals: -0.18 0.18
# Exact a, adot, b, bdot, g, gdot:
1.105694E-05 1.239534E-02 -1.606971E-06 -8.820860E-04 1.695398E-02 7.450368E-03
# Covariance matrix:
7.9092E-13 2.4065E-11 9.0245E-16 -9.9084E-13 1.0019E-11 1.3438E-09
2.4065E-11 1.0878E-08 3.9717E-13 -4.3120E-10 4.3648E-09 5.8484E-07
9.0245E-16 3.9717E-13 7.3346E-13 -9.5554E-13 1.8587E-13 2.2737E-11
-9.9084E-13 -4.3120E-10 -9.5554E-13 1.9156E-11 -1.7433E-10 -2.3254E-08
1.0019E-11 4.3648E-09 1.8587E-13 -1.7433E-10 1.7902E-09 2.3672E-07
1.3438E-09 5.8484E-07 2.2737E-11 -2.3254E-08 2.3672E-07 3.1554E-05
# lat0 lon0 xBary yBary zBary JD0
4.242629 -165.651095 -0.584117 0.060505 -0.814559 2458249.609121
# Heliocentric elements and errors
Epoch: 2458240.5000 = 2018/05/02
Mean Anomaly: 48.53651 +/- 41.284
Argument of Peri: 22.98344 +/- 14.219
Long of Asc Node: 60.54538 +/- 0.169
Inclination: 5.84366 +/- 0.017
Eccentricity: 0.52808577 +/- 0.3402
Semi-Major Axis: 67.06586759 +/- 33.2723
Time of Perihelion: 2431193.6434 +/- 11141.8
Perihelion: 31.64933749 +/- 27.6940
Aphelion: 102.48239769 +/- 55.7263
Period (y) 549.2379 +/- 408.73
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -57.63400125 +/- 0.1422
Ecliptic Y -15.35319496 +/- 0.0364
Ecliptic Z 4.36351721 +/- 0.0109
Ecliptic XDOT -0.00066980 +/- 0.0009
Ecliptic YDOT -0.00224331 +/- 0.0002
Ecliptic ZDOT -0.00005321 +/- 0.0001
# Distances at JD0 (AU)
Heliocenter to KBO 59.80333584 +/- 0.1374
Geocenter to KBO 58.98320690 +/- 0.1472
# Hcoef: 6.89
The following table shows the complete astrometric record for 18JU6. 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 (18JU6) followed by the observatory code and reference code for the source of the astrometry.
2018 05 11.10832 12 59 24.140 -01 44 38.41 24.8r 18JU6 807 C~31M1 2018 05 12.06934 12 59 21.591 -01 44 25.96 24.7r 18JU6 807 C~31M1 2019 02 03.27740 13 06 21.344 -02 32 02.81 24.5r 18JU6 304 C~31M1 2019 02 28.37535 13 05 34.451 -02 25 54.50 24.5r 18JU6 304 C~31M1 2019 03 01.23215 13 05 32.356 -02 25 39.23 24.6r 18JU6 304 C~31M1
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 0.10 0.00 0.16
2 0.0026 -40.06 -0.10 -3.25 -0.16
3 0.7342 6869.24 0.00 -217.15 -0.02
4 0.8029 6078.13 -0.18 -147.37 -0.09
5 0.8053 6043.25 0.18 -145.35 0.11
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.
18JU6 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0