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: 18VO137 # Created Sun Dec 22 02:11:03 2024 # Orbit generated from Bernstein formalism # Fitting 9 observations of 9 # Arc: 1.06y # First observation: 2018/11/08 # Last observation: 2019/12/01 Preliminary a, adot, b, bdot, g, gdot: -0.000031 0.009273 -0.000005 0.007483 0.016066 0.000000 # Chi-squared of fit: 1.45 DOF: 12 RMS: 0.07 # Min/Max residuals: -0.18 0.13 # Exact a, adot, b, bdot, g, gdot: 8.743675E-06 9.305550E-03 7.226788E-06 7.482053E-03 1.624981E-02 -1.672226E-03 # Covariance matrix: 6.8064E-13 3.6737E-13 -9.0645E-14 1.0677E-12 1.4764E-12 1.2547E-10 3.6737E-13 9.7201E-12 -1.0592E-12 1.5324E-11 6.6635E-12 1.8070E-09 -9.0645E-14 -1.0592E-12 3.8022E-13 -2.1424E-12 -8.3468E-13 -2.1835E-10 1.0677E-12 1.5324E-11 -2.1424E-12 2.7810E-11 1.1449E-11 3.1654E-09 1.4764E-12 6.6635E-12 -8.3468E-13 1.1449E-11 7.5806E-12 1.3489E-09 1.2547E-10 1.8070E-09 -2.1835E-10 3.1654E-09 1.3489E-09 3.7328E-07 # lat0 lon0 xBary yBary zBary JD0 -3.826986 37.945074 -0.137723 -0.065736 -0.984097 2458430.817951 # Heliocentric elements and errors Epoch: 2458430.5000 = 2018/11/08 Mean Anomaly: 232.72067 +/- 11.096 Argument of Peri: 136.15141 +/- 10.444 Long of Asc Node: 42.71670 +/- 0.002 Inclination: 39.07803 +/- 0.013 Eccentricity: 0.18830292 +/- 0.0270 Semi-Major Axis: 55.18218981 +/- 0.5734 Time of Perihelion: 2511366.6314 +/- 4540.7 Perihelion: 44.79122247 +/- 1.5608 Aphelion: 65.57315716 +/- 1.6383 Period (y) 409.9271 +/- 6.39 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 49.11476161 +/- 0.0082 Ecliptic Y 38.46463774 +/- 0.0064 Ecliptic Z -4.10694362 +/- 0.0007 Ecliptic XDOT -0.00111177 +/- 0.0001 Ecliptic YDOT 0.00111290 +/- 0.0001 Ecliptic ZDOT 0.00127642 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 62.51923824 +/- 0.0076 Geocenter to KBO 61.53918822 +/- 0.0104 # Hcoef: 7.22
The following table shows the complete astrometric record for 18VO137. 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 (18VO137) followed by the observatory code and reference code for the source of the astrometry.
2018 11 08.31715 02 27 21.218 +10 32 01.31 24.9r 18VO137 568 C~4ZZR 2018 11 08.47653 02 27 20.649 +10 31 59.46 24.8r 18VO137 568 C~4ZZR 2018 12 09.08898 02 25 43.692 +10 27 03.20 25.1r 18VO137 304 C~4ZZR 2018 12 09.15092 02 25 43.514 +10 27 02.82 25.2r 18VO137 304 C~4ZZR 2018 12 10.08937 02 25 40.998 +10 26 56.72 25.3r 18VO137 304 C~4ZZR 2018 12 12.14328 02 25 35.639 +10 26 44.69 25.0r 18VO137 304 C~4ZZR 2019 02 03.04593 02 24 37.200 +10 28 55.04 25.4r 18VO137 304 C~4ZZR 2019 11 30.19270 02 27 39.389 +11 02 45.19 25.2r 18VO137 304 C~4ZZR 2019 12 01.18651 02 27 36.374 +11 02 36.61 25.1r 18VO137 304 C~4ZZR
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 0.06 0.00 0.01
2 0.0004 -8.54 -0.01 0.92 0.13
3 0.0842 -1458.27 0.08 177.37 -0.03
4 0.0844 -1460.88 -0.02 177.85 0.03
5 0.0870 -1498.00 -0.18 183.96 -0.10
6 0.0926 -1576.74 0.01 197.89 -0.02
7 0.2375 -2351.47 0.06 597.87 -0.04
8 1.0592 841.89 -0.08 1662.23 -0.03
9 1.0619 797.08 0.07 1668.25 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.
18VO137 quality flag:1 Type: 5:2EEE SCATNEAR SCATEXTD axisobj 55.730 58.399 54.962 ecceobj 0.181 0.280 0.137 incobj 38.802 38.760 38.837 qmin 34.966 40.640 45.638 qmax 77.129 76.242 64.194 amean 55.461 58.077 54.675 amin 54.817 57.492 54.205 amax 56.318 58.782 55.226 emean 0.297 0.277 0.148 emin 0.181 0.262 0.137 emax 0.370 0.297 0.162 imean 35.974 38.373 38.256 imin 34.174 37.991 38.048 imax 38.442 38.759 38.483 excite_mean 0.660 0.680 0.637 fracstop 1.000 1.000 1.000 cjmean 2.637 2.611 2.644 libcent 0 193.7 -180.0 -180.0 libamp 0 135.2 -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 97.2 227.2 199.3 kozaiamp 49.3 180.0 179.9