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: 20FY30
# Created Sun Jul 27 01:11:50 2025
# Orbit generated from Bernstein formalism
# Fitting 14 observations of 14
# Arc: 4.84y
# First observation: 2016/03/17
# Last observation: 2021/01/18
Preliminary a, adot, b, bdot, g, gdot:
0.000009 0.004574 -0.000003 -0.000922 0.010076 0.000000
# Chi-squared of fit: 2.57 DOF: 22 RMS: 0.08
# Min/Max residuals: -0.22 0.15
# Exact a, adot, b, bdot, g, gdot:
7.318850E-06 4.575811E-03 -1.255162E-06 -9.193601E-04 1.011405E-02 -1.175468E-03
# Covariance matrix:
4.8859E-13 -2.0183E-13 -1.3804E-15 1.8020E-14 -1.8995E-13 -4.3946E-12
-2.0183E-13 2.4843E-12 2.8357E-14 -4.6599E-13 5.7332E-12 1.1512E-10
-1.3804E-15 2.8357E-14 4.8272E-13 -1.1767E-13 6.4030E-14 1.3531E-12
1.8020E-14 -4.6599E-13 -1.1767E-13 1.2219E-13 -1.0835E-12 -2.1946E-11
-1.8995E-13 5.7332E-12 6.4030E-14 -1.0835E-12 1.3543E-11 2.6804E-10
-4.3946E-12 1.1512E-10 1.3531E-12 -2.1946E-11 2.6804E-10 5.4180E-09
# lat0 lon0 xBary yBary zBary JD0
8.143230 -147.527835 0.574432 0.114611 -0.800038 2457465.083014
# Heliocentric elements and errors
Epoch: 2457460.5000 = 2016/03/13
Mean Anomaly: 220.43699 +/- 1.229
Argument of Peri: 307.47833 +/- 0.984
Long of Asc Node: 67.20976 +/- 0.008
Inclination: 13.87303 +/- 0.003
Eccentricity: 0.47886306 +/- 0.0023
Semi-Major Axis: 69.99850016 +/- 0.2449
Time of Perihelion: 2540388.1509 +/- 586.5
Perihelion: 36.47880451 +/- 0.2081
Aphelion: 103.51819581 +/- 0.3977
Period (y) 585.6543 +/- 3.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -83.56652846 +/- 0.0300
Ecliptic Y -52.50019945 +/- 0.0191
Ecliptic Z 14.00500228 +/- 0.0051
Ecliptic XDOT 0.00090099 +/- 0.0000
Ecliptic YDOT -0.00090179 +/- 0.0000
Ecliptic ZDOT -0.00029142 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 99.67836130 +/- 0.0271
Geocenter to KBO 98.87240227 +/- 0.0360
# Hcoef: 4.62
The following table shows the complete astrometric record for 20FY30. 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 (20FY30) followed by the observatory code and reference code for the source of the astrometry.
2016 03 17.582225 14 12 18.68 -04 40 18.8 20FY30 T09 C~8vLV 2016 03 17.604944 14 12 18.65 -04 40 18.4 20FY30 T09 C~8vLV 2016 03 17.632021 14 12 18.60 -04 40 18.3 20FY30 T09 C~8vLV 2020 03 24.43069 14 15 50.393 -05 12 20.36 24.3r 20FY30 568 C~4ZhP 2020 03 24.60765 14 15 50.065 -05 12 18.25 24.2r 20FY30 568 C~4ZhP 2020 05 27.16312 14 13 42.797 -05 01 46.26 24.6r 20FY30 G37 C~4ZhP 2020 05 27.16918 14 13 42.791 -05 01 45.96 24.7r 20FY30 G37 C~4ZhP 2020 05 27.17673 14 13 42.778 -05 01 45.85 24.5r 20FY30 G37 C~4ZhP 2020 05 27.23629 14 13 42.661 -05 01 45.61 24.5r 20FY30 G37 C~4ZhP 2020 05 27.24364 14 13 42.652 -05 01 45.65 24.6r 20FY30 G37 C~4ZhP 2020 06 11.21302 14 13 18.240 -05 00 33.87 24.4r 20FY30 G37 C~4ZhP 2020 06 11.27376 14 13 18.154 -05 00 33.51 24.8r 20FY30 G37 C~4ZhP 2021 01 17.36133 14 17 33.389 -05 29 06.30 24.5r 20FY30 304 C~4ZhP 2021 01 18.36326 14 17 33.907 -05 29 04.29 24.5r 20FY30 304 C~4ZhP
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 -0.03 0.00 -0.04
2 0.0001 -0.56 0.02 0.23 0.13
3 0.0001 -1.29 0.01 0.07 -0.09
4 4.0188 3626.06 0.08 -746.50 -0.03
5 4.0192 3620.73 -0.09 -746.16 0.01
6 4.1932 1617.16 0.03 -789.40 -0.22
7 4.1933 1616.97 0.02 -789.15 0.06
8 4.1933 1616.75 0.01 -789.11 0.12
9 4.1934 1615.02 -0.06 -789.47 -0.04
10 4.1935 1614.91 0.03 -789.56 -0.10
11 4.2344 1247.22 -0.01 -844.62 -0.01
12 4.2346 1245.89 -0.01 -844.72 0.15
13 4.8372 5413.35 0.06 -1178.98 -0.01
14 4.8399 5419.97 -0.05 -1174.49 0.06
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.
20FY30 quality flag:2 Type: 7:2EEEEE SCATNEAR 7:2EEEEE axisobj 69.411 70.195 68.755 ecceobj 0.491 0.498 0.485 incobj 13.961 13.967 13.955 qmin 35.126 34.766 35.164 qmax 106.119 108.789 105.768 amean 69.410 70.722 69.409 amin 68.154 69.635 68.353 amax 71.050 72.308 70.880 emean 0.480 0.493 0.480 emin 0.466 0.479 0.466 emax 0.496 0.508 0.494 imean 12.916 12.705 12.725 imin 12.231 11.774 12.054 imax 13.529 13.648 13.449 excite_mean 0.530 0.540 0.528 fracstop 1.000 1.000 1.000 cjmean 3.030 3.028 3.033 libcent 0 179.6 -180.0 179.1 libamp 0 171.8 -180.0 117.8 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 165.5 155.6 148.1 kozaiamp 179.9 180.0 180.0