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: 19ET8
# Created Sun Nov 24 02:10:56 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 16 observations of 16
# Arc: 5.93y
# First observation: 2013/04/01
# Last observation: 2019/03/08
# Chi-squared of fit: 2.35 DOF: 26 RMS: 0.07
# Min/Max residuals: -0.17 0.13
# Exact a, adot, b, bdot, g, gdot:
1.470717E-05 2.125711E-02 1.261839E-07 1.369725E-04 2.286842E-02 -5.919598E-04
# Covariance matrix:
1.4682E-12 -5.2425E-13 7.3520E-16 -1.8454E-15 -2.7079E-13 -2.1581E-12
-5.2425E-13 1.0476E-12 -1.5453E-15 6.8264E-15 1.7033E-12 8.2117E-12
7.3520E-16 -1.5453E-15 1.3503E-12 -2.3963E-13 -9.2413E-16 -1.1269E-14
-1.8454E-15 6.8264E-15 -2.3963E-13 4.5607E-14 1.2143E-14 5.6386E-14
-2.7079E-13 1.7033E-12 -9.2413E-16 1.2143E-14 4.1202E-12 1.4963E-11
-2.1581E-12 8.2117E-12 -1.1269E-14 5.6386E-14 1.4963E-11 6.8120E-11
# lat0 lon0 xBary yBary zBary JD0
3.430591 169.172274 -0.381011 0.055427 -0.923490 2456383.683415
# Heliocentric elements and errors
Epoch: 2456384.5000 = 2013/04/02
Mean Anomaly: 219.23727 +/- 0.860
Argument of Peri: 227.03013 +/- 0.843
Long of Asc Node: 85.33001 +/- 0.010
Inclination: 3.37592 +/- 0.000
Eccentricity: 0.02727221 +/- 0.0002
Semi-Major Axis: 43.71724282 +/- 0.0125
Time of Perihelion: 2497666.6936 +/- 253.7
Perihelion: 42.52497714 +/- 0.0139
Aphelion: 44.90950850 +/- 0.0145
Period (y) 289.0596 +/- 0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -43.85259839 +/- 0.0038
Ecliptic Y 8.00142707 +/- 0.0007
Ecliptic Z 2.61667325 +/- 0.0002
Ecliptic XDOT -0.00041393 +/- 0.0000
Ecliptic YDOT -0.00251267 +/- 0.0000
Ecliptic ZDOT 0.00001227 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 44.65334441 +/- 0.0037
Geocenter to KBO 43.72848582 +/- 0.0039
# Hcoef: 6.58
The following table shows the complete astrometric record for 19ET8. 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 (19ET8) followed by the observatory code and reference code for the source of the astrometry.
2013 04 01.182637 11 25 36.46 +07 26 25.0 19ET8 W84 C~89Ve 2018 03 18.551980 11 49 13.27 +04 55 52.9 19ET8 T09 C~89Ve 2018 03 18.592051 11 49 13.10 +04 55 53.9 19ET8 T09 C~89Ve 2018 03 19.217669 11 49 10.43 +04 56 11.3 23.0r 19ET8 W84 C~89Ve 2018 04 24.414877 11 46 48.78 +05 10 24.7 19ET8 T09 C~89Ve 2018 04 24.461268 11 46 48.62 +05 10 25.6 19ET8 T09 C~89Ve 2019 02 04.577421 11 56 24.40 +04 07 50.5 19ET8 T09 C~89Ve 2019 02 04.601511 11 56 24.33 +04 07 51.1 19ET8 T09 C~89Ve 2019 02 06.295622 11 56 19.38 +04 08 29.5 22.5z 19ET8 W84 C~89Ve 2019 03 02.45121 11 54 52.94 +04 18 52.6 22.6y 19ET8 T09 C~89Ve 2019 03 02.54851 11 54 52.54 +04 18 55.2 22.6y 19ET8 T09 C~89Ve 2019 03 02.57800 11 54 52.42 +04 18 56.1 22.8y 19ET8 T09 C~89Ve 2019 03 02.58871 11 54 52.38 +04 18 56.3 22.9y 19ET8 T09 C~89Ve 2019 03 08.37278 11 54 28.53 +04 21 38.6 23.2r 19ET8 T09 C~89Ve 2019 03 08.38324 11 54 28.50 +04 21 38.8 23.0r 19ET8 T09 C~89Ve 2019 03 08.41689 11 54 28.35 +04 21 39.8 23.2r 19ET8 T09 C~89Ve
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 -0.01
2 4.9620 0.00 -0.09 0.00 0.07
3 4.9621 0.00 -0.03 0.00 -0.04
4 4.9638 0.00 -0.02 0.00 -0.10
5 5.0629 0.00 0.13 0.00 0.03
6 5.0630 0.00 0.02 0.00 0.11
7 5.8464 0.00 0.02 0.00 -0.07
8 5.8465 0.00 0.04 0.00 -0.00
9 5.8511 0.00 -0.01 0.00 0.02
10 5.9172 0.00 -0.03 0.00 0.02
11 5.9175 0.00 -0.00 0.00 -0.09
12 5.9176 0.00 0.02 0.00 -0.01
13 5.9176 0.00 0.08 0.00 -0.11
14 5.9334 0.00 -0.17 0.00 0.11
15 5.9335 0.00 0.05 0.00 0.02
16 5.9336 0.00 -0.05 0.00 0.07
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.