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: 19ET7
# Created Thu Apr 3 01:11:16 2025
# Orbit generated from Bernstein formalism
# Fitting 20 observations of 20
# Arc: 3.16y
# First observation: 2018/03/18
# Last observation: 2021/05/13
Preliminary a, adot, b, bdot, g, gdot:
0.000096 0.024058 -0.000004 -0.000579 0.024554 0.000000
# Chi-squared of fit: 6.00 DOF: 34 RMS: 0.10
# Min/Max residuals: -0.30 0.18
# Exact a, adot, b, bdot, g, gdot:
1.580240E-05 2.424579E-02 -5.090881E-07 -5.848654E-04 2.458682E-02 2.683308E-04
# Covariance matrix:
3.6551E-13 -6.1284E-13 -7.4808E-15 1.5541E-14 -6.8567E-14 -8.4025E-12
-6.1284E-13 1.9175E-12 3.0029E-14 -6.3298E-14 -2.7815E-13 3.3644E-11
-7.4808E-15 3.0029E-14 2.1236E-13 -1.5936E-13 -6.3693E-15 5.8638E-13
1.5541E-14 -6.3298E-14 -1.5936E-13 1.8369E-13 1.4355E-14 -1.2387E-12
-6.8567E-14 -2.7815E-13 -6.3693E-15 1.4355E-14 6.2166E-13 -7.0498E-12
-8.4025E-12 3.3644E-11 5.8638E-13 -1.2387E-12 -7.0498E-12 6.5673E-10
# lat0 lon0 xBary yBary zBary JD0
1.077401 173.005233 -0.072195 0.018737 -0.991548 2458195.957119
# Heliocentric elements and errors
Epoch: 2458190.5000 = 2018/03/13
Mean Anomaly: 18.65964 +/- 1.652
Argument of Peri: 122.84486 +/- 1.769
Long of Asc Node: 30.37467 +/- 0.020
Inclination: 1.73683 +/- 0.001
Eccentricity: 0.03157261 +/- 0.0005
Semi-Major Axis: 42.94420738 +/- 0.0093
Time of Perihelion: 2452862.5994 +/- 471.8
Perihelion: 41.58834682 +/- 0.0237
Aphelion: 44.30006794 +/- 0.0239
Period (y) 281.4266 +/- 0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -41.35689293 +/- 0.0013
Ecliptic Y 4.99411359 +/- 0.0002
Ecliptic Z 0.76476143 +/- 0.0000
Ecliptic XDOT -0.00035329 +/- 0.0000
Ecliptic YDOT -0.00268048 +/- 0.0000
Ecliptic ZDOT -0.00006471 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.66435675 +/- 0.0013
Geocenter to KBO 40.67219318 +/- 0.0013
# Hcoef: 7.67
The following table shows the complete astrometric record for 19ET7. 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 (19ET7) followed by the observatory code and reference code for the source of the astrometry.
2018 03 18.456318 11 36 01.00 +03 45 58.0 19ET7 T09 C~870X 2018 03 18.503026 11 36 00.79 +03 45 59.3 19ET7 T09 C~870X 2018 03 18.573359 11 36 00.46 +03 46 01.3 19ET7 T09 C~870X 2018 04 24.442548 11 33 31.42 +04 01 24.1 19ET7 T09 C~870X 2019 02 02.650833 11 44 04.86 +02 51 28.2 19ET7 T09 C~870X 2019 02 04.584538 11 43 58.70 +02 52 09.6 19ET7 T09 C~870X 2019 02 04.658303 11 43 58.44 +02 52 11.3 19ET7 T09 C~870X 2019 02 05.468566 11 43 55.81 +02 52 29.0 19ET7 T09 C~870X 2019 03 02.51346 11 42 17.52 +03 03 15.6 23.5y 19ET7 T09 C~83GA 2019 03 02.52968 11 42 17.44 +03 03 16.3 23.5y 19ET7 T09 C~83GA 2019 03 02.55653 11 42 17.31 +03 03 17.2 23.7y 19ET7 T09 C~83GA 2019 03 07.56205 11 41 55.11 +03 05 40.6 23.5y 19ET7 T09 C~83GA 2019 03 07.56472 11 41 55.09 +03 05 40.8 23.2y 19ET7 T09 C~83GA 2019 03 07.61553 11 41 54.84 +03 05 42.3 23.4y 19ET7 T09 C~83GA 2019 03 08.35603 11 41 51.56 +03 06 03.6 24.0r 19ET7 T09 C~83GA 2019 03 08.40012 11 41 51.35 +03 06 05.0 23.7r 19ET7 T09 C~83GA 2019 03 08.40222 11 41 51.35 +03 06 05.0 23.8r 19ET7 T09 C~83GA 2019 03 08.43185 11 41 51.20 +03 06 05.8 24.0r 19ET7 T09 C~83GA 2019 04 04.438631 11 39 50.62 +03 18 51.3 19ET7 T09 C~870X 2021 05 13.963399 11 47 39.56 +02 22 51.8 19ET7 W84 C~870X
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 -0.04 0.00 0.03
2 0.0001 -3.40 0.05 -0.05 0.02
3 0.0003 -8.73 -0.02 -0.17 -0.03
4 0.1013 -2422.39 0.01 -34.31 0.08
5 0.8794 7952.24 0.12 -127.66 -0.00
6 0.8847 7850.95 0.08 -126.35 -0.04
7 0.8849 7846.70 -0.16 -126.34 -0.04
8 0.8871 7803.44 0.05 -125.76 -0.08
9 0.9557 6193.51 0.09 -117.41 -0.13
10 0.9557 6192.13 -0.11 -117.24 0.05
11 0.9558 6189.98 -0.30 -117.19 0.11
12 0.9695 5827.55 0.18 -117.63 -0.02
13 0.9695 5827.20 0.02 -117.56 0.05
14 0.9696 5823.16 -0.25 -117.67 -0.04
15 0.9717 5769.57 0.15 -117.63 -0.01
16 0.9718 5766.13 -0.01 -117.60 0.05
17 0.9718 5766.13 0.15 -117.60 0.05
18 0.9719 5763.74 -0.03 -117.75 -0.09
19 1.0458 3801.31 0.01 -131.76 0.02
20 3.1554 11594.93 0.00 -422.83 0.03
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.
19ET7 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.696 42.732 42.660 ecceobj 0.028 0.030 0.026 incobj 1.739 1.739 1.739 qmin 40.305 40.203 40.342 qmax 45.541 45.702 45.425 amean 42.822 42.858 42.787 amin 42.494 42.524 42.455 amax 43.156 43.195 43.131 emean 0.035 0.037 0.033 emin 0.015 0.017 0.012 emax 0.056 0.058 0.054 imean 1.703 1.690 1.718 imin 0.418 0.431 0.404 imax 2.459 2.450 2.469 excite_mean 0.048 0.050 0.047 fracstop 1.000 1.000 1.000 cjmean 3.085 3.085 3.085 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 174.3 173.4 174.6 kozaiamp 180.0 180.0 180.0