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: 16ET402 # Created Sun Oct 19 01:11:25 2025 # Orbit generated from Bernstein formalism # Fitting 17 observations of 17 # Arc: 26.00d # First observation: 2016/03/09 # Last observation: 2016/04/04 Preliminary a, adot, b, bdot, g, gdot: 0.000000 0.022474 -0.000003 -0.011484 0.024585 0.000000 # WARNING Fitting with energy constraint # Chi-squared of fit: 21.62 DOF: 29 RMS: 0.20 # Min/Max residuals: -0.53 0.63 # Exact a, adot, b, bdot, g, gdot: 1.275573E-05 2.005219E-02 -7.554010E-06 -1.086996E-02 2.392710E-02 -1.188632E-02 # Covariance matrix: 2.3577E-13 -2.4523E-11 -5.3254E-15 4.4790E-12 -2.1651E-12 1.5584E-09 -2.4523E-11 1.1387E-07 -9.1267E-11 -2.7472E-08 2.5989E-08 1.7480E-06 -5.3254E-15 -9.1267E-11 2.3088E-13 1.9480E-11 -2.1644E-11 -1.9384E-09 4.4790E-12 -2.7472E-08 1.9480E-11 6.7601E-09 -6.3031E-09 -4.4031E-07 -2.1651E-12 2.5989E-08 -2.1644E-11 -6.3031E-09 6.0350E-09 4.6531E-07 1.5584E-09 1.7480E-06 -1.9384E-09 -4.4031E-07 4.6531E-07 7.1403E-05 # lat0 lon0 xBary yBary zBary JD0 16.683639 -138.426944 0.784972 0.173201 -0.577427 2457457.114669 # Heliocentric elements and errors Epoch: 2457450.5000 = 2016/03/03 Mean Anomaly: 324.14541 +/- 28.297 Argument of Peri: 242.14453 +/- 1.916 Long of Asc Node: 68.00719 +/- 0.431 Inclination: 32.55198 +/- 0.379 Eccentricity: 0.51895204 +/- 0.3559 Semi-Major Axis: 55.96223471 +/- 27.2070 Time of Perihelion: 2472679.9154 +/- 4595.5 Perihelion: 26.92051876 +/- 23.8325 Aphelion: 85.00395066 +/- 45.8754 Period (y) 418.6497 +/- 305.30 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -30.92542893 +/- 0.0972 Ecliptic Y -26.38085902 +/- 0.0863 Ecliptic Z 11.99812539 +/- 0.0390 Ecliptic XDOT 0.00222997 +/- 0.0007 Ecliptic YDOT -0.00109591 +/- 0.0006 Ecliptic ZDOT -0.00158189 +/- 0.0003 # Distances at JD0 (AU) Heliocenter to KBO 42.38262486 +/- 0.0897 Geocenter to KBO 41.79361523 +/- 0.1357 # Hcoef: 8.54
The following table shows the complete astrometric record for 16ET402. 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 (16ET402) followed by the observatory code and reference code for the source of the astrometry.
2016 03 09.61388 14 56 52.98 +00 36 16.9 26.0r 16ET402 T09 C~94sV 2016 03 09.62752 14 56 52.94 +00 36 17.4 25.8r 16ET402 T09 C~94sV 2016 03 09.65144 14 56 52.89 +00 36 17.9 25.6r 16ET402 T09 C~94sV 2016 03 09.65573 14 56 52.87 +00 36 17.7 25.8r 16ET402 T09 C~94sV 2016 03 12.61360 14 56 45.79 +00 37 31.8 25.0z 16ET402 T09 C~94sV 2016 03 12.62712 14 56 45.75 +00 37 32.0 24.4z 16ET402 T09 C~94sV 2016 03 12.63253 14 56 45.74 +00 37 32.0 24.8z 16ET402 T09 C~94sV 2016 03 15.55911 14 56 38.05 +00 38 45.8 23.4y 16ET402 T09 C~94sV 2016 03 15.56722 14 56 38.01 +00 38 45.6 23.4y 16ET402 T09 C~94sV 2016 03 15.58344 14 56 38.02 +00 38 46.3 24.2y 16ET402 T09 C~94sV 2016 03 15.60777 14 56 37.92 +00 38 47.1 23.8y 16ET402 T09 C~94sV 2016 03 15.62394 14 56 37.89 +00 38 47.5 24.1y 16ET402 T09 C~94sV 2016 03 15.63741 14 56 37.89 +00 38 47.8 24.2y 16ET402 T09 C~94sV 2016 04 04.57957 14 55 29.66 +00 47 08.2 25.2g 16ET402 T09 C~94sV 2016 04 04.58878 14 55 29.61 +00 47 08.5 25.3g 16ET402 T09 C~94sV 2016 04 04.59302 14 55 29.61 +00 47 08.5 25.4g 16ET402 T09 C~94sV 2016 04 04.61860 14 55 29.50 +00 47 09.2 25.5g 16ET402 T09 C~94sV
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 0.10 0.00 0.08
2 0.0000 -0.72 -0.06 0.30 0.20
3 0.0001 -1.59 0.06 0.55 0.14
4 0.0001 -1.81 0.01 0.27 -0.20
5 0.0082 -125.25 -0.14 39.41 0.13
6 0.0082 -125.88 -0.17 39.43 -0.02
7 0.0083 -126.02 -0.07 39.38 -0.13
8 0.0163 -258.10 -0.24 75.51 -0.07
9 0.0163 -258.62 -0.36 75.14 -0.53
10 0.0163 -258.68 0.35 75.86 -0.00
11 0.0164 -260.35 -0.15 76.17 0.03
12 0.0165 -260.90 0.07 76.42 0.10
13 0.0165 -260.99 0.63 76.71 0.23
14 0.0711 -1386.92 0.03 249.93 -0.00
15 0.0711 -1387.73 -0.17 250.00 0.02
16 0.0711 -1387.73 0.11 250.00 -0.00
17 0.0712 -1389.51 0.01 250.17 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.
16ET402 quality flag:0 Type: ERR2LARGE ERR2LARGE ERR2LARGE axisobj 0.000 0.000 0.000 ecceobj -1.000 -1.000 -1.000 incobj -1.000 -1.000 -1.000 qmin 0.000 0.000 0.000 qmax 0.000 0.000 0.000 amean 0.000 0.000 0.000 amin 0.000 0.000 0.000 amax 0.000 0.000 0.000 emean 0.000 0.000 0.000 emin 0.000 0.000 0.000 emax 0.000 0.000 0.000 imean 0.000 0.000 0.000 imin 0.000 0.000 0.000 imax 0.000 0.000 0.000 excite_mean 0.000 0.000 0.000 fracstop 0.000 0.000 0.000 cjmean 0.000 0.000 0.000 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 0.0 0.0 0.0 kozaiamp 0.0 0.0 0.0