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: 19EM8 # Created Mon Apr 28 01:11:14 2025 # Orbit generated from Bernstein formalism # Fitting 11 observations of 11 # Arc: 112.78d # First observation: 2018/11/15 # Last observation: 2019/03/08 Preliminary a, adot, b, bdot, g, gdot: 0.000002 0.021701 0.000009 -0.000248 0.023179 0.000000 # Chi-squared of fit: 5.88 DOF: 16 RMS: 0.13 # Min/Max residuals: -0.22 0.31 # Exact a, adot, b, bdot, g, gdot: 1.467347E-05 2.094411E-02 2.737406E-07 -2.685465E-04 2.259964E-02 -9.746322E-04 # Covariance matrix: 4.8488E-13 -3.9252E-12 3.8482E-15 -3.9257E-13 -2.5793E-14 9.1674E-11 -3.9252E-12 4.8343E-10 7.1329E-12 3.4384E-11 2.1227E-10 1.9210E-08 3.8482E-15 7.1329E-12 4.8939E-13 -9.9546E-13 3.6154E-12 3.6397E-10 -3.9257E-13 3.4384E-11 -9.9546E-13 1.1554E-11 1.3188E-11 1.0052E-09 -2.5793E-14 2.1227E-10 3.6154E-12 1.3188E-11 1.0615E-10 1.0576E-08 9.1674E-11 1.9210E-08 3.6397E-10 1.0052E-09 1.0576E-08 1.1285E-06 # lat0 lon0 xBary yBary zBary JD0 -10.061332 146.300551 0.993252 0.009670 0.053896 2458438.058881 # Heliocentric elements and errors Epoch: 2458430.5000 = 2018/11/08 Mean Anomaly: 246.41596 +/- 16.931 Argument of Peri: 26.09842 +/- 16.559 Long of Asc Node: 240.69411 +/- 0.059 Inclination: 10.12112 +/- 0.001 Eccentricity: 0.08096178 +/- 0.0427 Semi-Major Axis: 42.59987279 +/- 0.2033 Time of Perihelion: 2490472.9473 +/- 4770.8 Perihelion: 39.15091135 +/- 1.8277 Aphelion: 46.04883423 +/- 1.8313 Period (y) 278.0486 +/- 1.99 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -35.65012855 +/- 0.0165 Ecliptic Y 24.96121080 +/- 0.0110 Ecliptic Z -7.73033782 +/- 0.0035 Ecliptic XDOT -0.00129866 +/- 0.0001 Ecliptic YDOT -0.00218090 +/- 0.0001 Ecliptic ZDOT -0.00001160 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 44.20126506 +/- 0.0147 Geocenter to KBO 44.24848534 +/- 0.0202 # Hcoef: 8.18
The following table shows the complete astrometric record for 19EM8. 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 (19EM8) followed by the observatory code and reference code for the source of the astrometry.
2018 11 15.55808 09 40 32.37 +03 16 07.8 23.8z 19EM8 T09 C~870Y 2018 11 15.60564 09 40 32.40 +03 16 07.0 23.9z 19EM8 T09 C~870Y 2018 11 15.63220 09 40 32.42 +03 16 06.6 23.8z 19EM8 T09 C~870Y 2019 01 06.49177 09 39 13.26 +03 11 07.6 25.7g 19EM8 T09 C~870Y 2019 01 06.57641 09 39 13.00 +03 11 08.3 25.3g 19EM8 T09 C~870Y 2019 01 06.59969 09 39 12.90 +03 11 08.4 25.7g 19EM8 T09 C~870Y 2019 01 06.61913 09 39 12.82 +03 11 08.8 26.2g 19EM8 T09 C~870Y 2019 03 08.27291 09 34 56.95 +03 30 38.2 24.6r 19EM8 T09 C~870Y 2019 03 08.27500 09 34 56.95 +03 30 38.2 24.5r 19EM8 T09 C~870Y 2019 03 08.29600 09 34 56.88 +03 30 38.5 24.4r 19EM8 T09 C~870Y 2019 03 08.33820 09 34 56.69 +03 30 39.7 24.3r 19EM8 T09 C~870Y
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 -0.00 0.00 -0.10
2 0.0001 0.69 -0.01 -0.61 -0.01
3 0.0002 1.10 0.02 -0.88 0.10
4 0.1422 -1018.40 -0.22 -675.79 -0.14
5 0.1424 -1022.31 0.31 -676.42 0.10
6 0.1425 -1023.75 0.08 -676.82 -0.07
7 0.1425 -1025.02 -0.17 -676.84 0.11
8 0.3086 -5028.68 -0.18 -840.22 0.09
9 0.3086 -5028.68 -0.04 -840.22 0.08
10 0.3087 -5029.77 0.26 -840.29 -0.08
11 0.3088 -5032.85 -0.04 -840.09 -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.
19EM8 quality flag:2 Type: CLASSICAL 7:4EEE CLASSICAL axisobj 42.661 43.537 42.555 ecceobj 0.075 0.197 0.066 incobj 10.102 10.103 10.103 qmin 38.598 34.050 38.763 qmax 47.021 54.054 46.553 amean 42.675 43.726 42.559 amin 42.340 43.227 42.222 amax 43.026 44.294 42.923 emean 0.077 0.197 0.069 emin 0.062 0.172 0.052 emax 0.093 0.222 0.086 imean 11.702 12.197 11.742 imin 10.933 11.234 10.976 imax 12.429 13.309 12.461 excite_mean 0.217 0.289 0.215 fracstop 1.000 1.000 1.000 cjmean 3.030 2.998 3.030 libcent 0 -180.0 177.8 -180.0 libamp 0 -180.0 132.3 -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 177.2 174.1 175.4 kozaiamp 179.9 179.9 180.0