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: 19ER7
# Created Wed Mar 26 01:11:15 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 26 observations of 26
# Arc: 11.90y
# First observation: 2013/04/01
# Last observation: 2025/02/23
# Chi-squared of fit: 21.74 DOF: 46 RMS: 0.16
# Min/Max residuals: -0.59 0.60
# Exact a, adot, b, bdot, g, gdot:
1.360637E-05 2.371634E-02 -9.305778E-06 -1.558301E-02 2.732423E-02 1.082997E-03
# Covariance matrix:
1.0377E-12 -2.7115E-13 -3.9432E-13 1.3176E-13 -6.1160E-14 -5.9386E-13
-2.7115E-13 7.9991E-14 1.2849E-13 -4.2938E-14 1.1605E-14 1.9351E-13
-3.9432E-13 1.2849E-13 6.4286E-13 -1.4339E-13 7.7255E-14 3.7046E-13
1.3176E-13 -4.2938E-14 -1.4339E-13 3.8512E-14 -2.5715E-14 -1.2378E-13
-6.1160E-14 1.1605E-14 7.7255E-14 -2.5715E-14 4.8080E-13 1.1665E-13
-5.9386E-13 1.9351E-13 3.7046E-13 -1.2378E-13 1.1665E-13 5.5796E-13
# lat0 lon0 xBary yBary zBary JD0
6.591021 167.790237 -0.403276 0.105168 -0.909608 2456383.687295
# Heliocentric elements and errors
Epoch: 2456384.5000 = 2013/04/02
Mean Anomaly: 58.84091 +/- 0.061
Argument of Peri: 103.73099 +/- 0.069
Long of Asc Node: 358.05044 +/- 0.000
Inclination: 33.92904 +/- 0.000
Eccentricity: 0.05761809 +/- 0.0000
Semi-Major Axis: 38.56106862 +/- 0.0040
Time of Perihelion: 2442089.0151 +/- 14.9
Perihelion: 36.33925331 +/- 0.0042
Aphelion: 40.78288393 +/- 0.0046
Period (y) 239.4593 +/- 0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -36.51296126 +/- 0.0009
Ecliptic Y 7.49046712 +/- 0.0002
Ecliptic Z 4.20036994 +/- 0.0001
Ecliptic XDOT -0.00078939 +/- 0.0000
Ecliptic YDOT -0.00226145 +/- 0.0000
Ecliptic ZDOT -0.00153848 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 37.50925568 +/- 0.0009
Geocenter to KBO 36.59756126 +/- 0.0009
# Hcoef: 6.92
The following table shows the complete astrometric record for 19ER7. 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 (19ER7) followed by the observatory code and reference code for the source of the astrometry.
2013 04 01.186517 11 25 32.376 +10 53 14.82 22.6z 19ER7 W84 C~8HR7 2017 03 02.226416 11 42 31.040 +05 15 21.38 22.6r 19ER7 W84 C~83GA 2017 03 02.227611 11 42 31.028 +05 15 21.45 22.8g 19ER7 W84 C~83GA 2017 03 06.209433 11 42 10.054 +05 17 03.02 22.7g 19ER7 W84 C~83GA 2017 03 31.145707 11 39 57.050 +05 27 13.68 22.5r 19ER7 W84 C~83GA 2018 03 18.47675 11 44 35.87 +04 00 53.7 22.5i 19ER7 T09 C~83GA 2018 03 18.50571 11 44 35.69 +04 00 54.4 22.5i 19ER7 T09 C~83GA 2018 03 18.57871 11 44 35.29 +04 00 56.2 22.5i 19ER7 T09 C~83GA 2018 03 19.217669 11 44 31.867 +04 01 12.28 22.4r 19ER7 W84 C~83GA 2018 04 24.36908 11 41 35.13 +04 13 41.0 22.3z 19ER7 T09 C~83GA 2018 04 24.41221 11 41 34.95 +04 13 41.5 22.5z 19ER7 T09 C~83GA 2018 04 24.44523 11 41 34.81 +04 13 42.0 22.3z 19ER7 T09 C~83GA 2018 04 24.49606 11 41 34.62 +04 13 42.8 22.6z 19ER7 T09 C~83GA 2018 05 13.049680 11 40 32.342 +04 16 38.56 22.8r 19ER7 W84 C~83GA 2018 05 16.989497 11 40 22.665 +04 16 51.74 23.6g 19ER7 W84 C~83GA 2019 03 02.41395 11 49 30.77 +02 33 03.6 22.2y 19ER7 T09 C~83GA 2019 03 02.51880 11 49 30.23 +02 33 06.2 22.9y 19ER7 T09 C~83GA 2019 03 02.55921 11 49 30.02 +02 33 07.2 22.7y 19ER7 T09 C~83GA 2019 03 02.60017 11 49 29.80 +02 33 08.1 22.3y 19ER7 T09 C~83GA 2019 03 08.36022 11 48 59.80 +02 35 30.7 22.4r 19ER7 T09 C~83GA 2019 03 08.39173 11 48 59.64 +02 35 31.6 22.5r 19ER7 T09 C~83GA 2019 03 08.40431 11 48 59.58 +02 35 31.7 22.5r 19ER7 T09 C~83GA 2019 03 08.43394 11 48 59.40 +02 35 32.6 22.5r 19ER7 T09 C~83GA 2025 02 23.426530 12 10 31.248 -05 28 49.61 22.5G 19ER7 G37 C~8iif 2025 02 23.468930 12 10 31.055 -05 28 49.54 19ER7 G37 C~8iif 2025 02 23.520530 12 10 30.821 -05 28 47.47 19ER7 G37 C~8iif
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 0.05 0.00 0.04
2 3.9180 0.00 0.01 0.00 -0.06
3 3.9180 0.00 -0.08 0.00 -0.02
4 3.9289 0.00 -0.05 0.00 -0.06
5 3.9972 0.00 0.10 0.00 -0.01
6 4.9618 0.00 0.38 0.00 0.13
7 4.9619 0.00 0.05 0.00 0.10
8 4.9621 0.00 0.01 0.00 0.08
9 4.9638 0.00 0.02 0.00 -0.03
10 5.0628 0.00 -0.12 0.00 0.17
11 5.0629 0.00 -0.15 0.00 0.06
12 5.0630 0.00 -0.21 0.00 0.09
13 5.0631 0.00 0.05 0.00 0.17
14 5.1139 0.00 0.19 0.00 -0.17
15 5.1247 0.00 0.05 0.00 -0.09
16 5.9171 0.00 -0.13 0.00 -0.05
17 5.9174 0.00 -0.01 0.00 -0.01
18 5.9175 0.00 0.00 0.00 0.01
19 5.9176 0.00 -0.09 0.00 -0.09
20 5.9334 0.00 -0.14 0.00 -0.08
21 5.9335 0.00 -0.00 0.00 0.03
22 5.9335 0.00 0.11 0.00 -0.19
23 5.9336 0.00 -0.21 0.00 -0.03
24 11.8994 0.00 -0.06 0.00 0.05
25 11.8995 0.00 0.03 0.00 -0.59
26 11.8996 0.00 0.14 0.00 0.60
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.
19ER7 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 38.466 38.466 38.466 ecceobj 0.057 0.057 0.057 incobj 33.993 33.993 33.993 qmin 35.900 35.909 35.918 qmax 41.256 41.283 41.295 amean 38.516 38.516 38.516 amin 38.233 38.238 38.239 amax 38.816 38.795 38.818 emean 0.051 0.051 0.051 emin 0.038 0.038 0.038 emax 0.064 0.064 0.064 imean 34.283 34.283 34.284 imin 33.948 33.950 33.951 imax 34.643 34.642 34.640 excite_mean 0.566 0.566 0.566 fracstop 1.000 1.000 1.000 cjmean 2.648 2.648 2.648 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 176.5 176.4 176.5 kozaiamp 180.0 179.9 180.0