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: 18HT14
# Created Wed May 21 01:11:13 2025
# Orbit generated from Bernstein formalism
# Fitting 13 observations of 13
# Arc: 37.03d
# First observation: 2018/03/18
# Last observation: 2018/04/24
Preliminary a, adot, b, bdot, g, gdot:
0.000001 0.032809 -0.000001 0.000853 0.026034 0.000000
# WARNING MRQMIN stopped after 13 iterations -- oscilliatory solution
# WARNING Fitting with energy constraint
# Chi-squared of fit: 4.37 DOF: 21 RMS: 0.10
# Min/Max residuals: -0.21 0.23
# Exact a, adot, b, bdot, g, gdot:
1.663297E-05 2.532473E-02 -1.317258E-07 8.316789E-04 2.485398E-02 6.610831E-04
# Covariance matrix:
3.5003E-12 4.9582E-09 8.3612E-15 1.2450E-11 7.3958E-10 -5.6755E-08
4.9582E-09 7.8536E-06 1.3192E-11 1.9635E-08 1.1686E-06 -9.0800E-05
8.3612E-15 1.3192E-11 3.6314E-13 -3.6337E-12 1.9779E-12 -1.4519E-10
1.2450E-11 1.9635E-08 -3.6337E-12 1.0394E-10 2.9470E-09 -2.1455E-07
7.3958E-10 1.1686E-06 1.9779E-12 2.9470E-09 1.7459E-07 -1.3166E-05
-5.6755E-08 -9.0800E-05 -1.4519E-10 -2.1455E-07 -1.3166E-05 1.2199E-03
# lat0 lon0 xBary yBary zBary JD0
0.534546 175.222840 -0.033524 0.009363 -0.993738 2458195.943321
# Heliocentric elements and errors
Epoch: 2458190.5000 = 2018/03/13
Mean Anomaly: 13.95604 +/- 36.118
Argument of Peri: 358.68747 +/- 200.799
Long of Asc Node: 159.74755 +/- 1.658
Inclination: 1.94746 +/- 0.204
Eccentricity: 0.09248354 +/- 0.2722
Semi-Major Axis: 45.26601147 +/- 5.3492
Time of Perihelion: 2453878.1263 +/- 233637.0
Perihelion: 41.07965033 +/- 13.2442
Aphelion: 49.45237261 +/- 13.6380
Period (y) 304.5556 +/- 53.99
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.08799831 +/- 0.6740
Ecliptic Y 3.39284498 +/- 0.0564
Ecliptic Z 0.37538298 +/- 0.0063
Ecliptic XDOT -0.00029768 +/- 0.0038
Ecliptic YDOT -0.00277850 +/- 0.0006
Ecliptic ZDOT 0.00009214 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.22955147 +/- 0.6717
Geocenter to KBO 40.23500235 +/- 0.6764
# Hcoef: 8.01
The following table shows the complete astrometric record for 18HT14. 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 (18HT14) followed by the observatory code and reference code for the source of the astrometry.
2018 03 18.44252 11 43 18.63 +02 23 20.7 23.8i 18HT14 T09 C~8swO 2018 03 18.48956 11 43 18.42 +02 23 21.9 23.8i 18HT14 T09 C~8swO 2018 03 18.49223 11 43 18.40 +02 23 21.9 23.8i 18HT14 T09 C~8swO 2018 03 18.56269 11 43 18.08 +02 23 24.1 23.9i 18HT14 T09 C~8swO 2018 04 22.39706 11 40 53.95 +02 39 04.8 24.5r 18HT14 T09 C~8swO 2018 04 22.40972 11 40 53.88 +02 39 05.3 24.8r 18HT14 T09 C~8swO 2018 04 22.42646 11 40 53.84 +02 39 05.8 24.8r 18HT14 T09 C~8swO 2018 04 24.33478 11 40 47.40 +02 39 47.1 23.8z 18HT14 T09 C~8swO 2018 04 24.35538 11 40 47.34 +02 39 47.5 23.8z 18HT14 T09 C~8swO 2018 04 24.38531 11 40 47.24 +02 39 48.3 23.9z 18HT14 T09 C~8swO 2018 04 24.42918 11 40 47.10 +02 39 49.2 23.8z 18HT14 T09 C~8swO 2018 04 24.43185 11 40 47.08 +02 39 49.2 23.5z 18HT14 T09 C~8swO 2018 04 24.47199 11 40 46.95 +02 39 50.0 23.5z 18HT14 T09 C~8swO
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 0.14
2 0.0001 -3.37 0.08 -0.15 -0.01
3 0.0001 -3.64 0.00 -0.27 -0.13
4 0.0003 -8.92 0.03 -0.15 -0.01
5 0.0957 -2364.83 0.23 6.98 -0.07
6 0.0957 -2365.99 -0.21 7.03 -0.02
7 0.0958 -2366.74 -0.01 7.25 0.21
8 0.1010 -2471.72 -0.14 6.93 -0.11
9 0.1011 -2472.70 0.01 6.94 -0.09
10 0.1011 -2474.39 -0.03 7.08 0.07
11 0.1013 -2476.68 0.10 7.07 0.09
12 0.1013 -2476.95 -0.02 6.95 -0.03
13 0.1014 -2479.06 0.07 6.92 -0.05
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.
18HT14 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