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: 20YP30
# Created Thu Mar 27 01:11:32 2025
# Orbit generated from Bernstein formalism
# Fitting 12 observations of 12
# Arc: 4.19y
# First observation: 2020/12/17
# Last observation: 2025/02/23
Preliminary a, adot, b, bdot, g, gdot:
0.000024 0.032904 0.000000 0.001194 0.028279 0.000000
# Chi-squared of fit: 7.76 DOF: 18 RMS: 0.14
# Min/Max residuals: -0.30 0.31
# Exact a, adot, b, bdot, g, gdot:
1.881682E-05 3.303708E-02 2.043118E-07 1.193474E-03 2.838857E-02 -5.321893E-04
# Covariance matrix:
6.7138E-13 -4.4605E-14 9.3114E-15 4.8518E-15 8.9500E-13 -1.0438E-12
-4.4605E-14 1.0386E-12 5.8074E-17 3.4847E-14 3.9871E-13 9.6586E-12
9.3114E-15 5.8074E-17 2.5227E-13 -7.2240E-14 1.9684E-14 -2.8622E-14
4.8518E-15 3.4847E-14 -7.2240E-14 4.1760E-14 2.2122E-14 3.2503E-13
8.9500E-13 3.9871E-13 1.9684E-14 2.2122E-14 2.0260E-12 1.0872E-12
-1.0438E-12 9.6586E-12 -2.8622E-14 3.2503E-13 1.0872E-12 9.7576E-11
# lat0 lon0 xBary yBary zBary JD0
7.391506 97.339323 0.192392 0.124836 -0.962740 2459200.997561
# Heliocentric elements and errors
Epoch: 2459200.5000 = 2020/12/17
Mean Anomaly: 356.38408 +/- 0.054
Argument of Peri: 79.88590 +/- 0.091
Long of Asc Node: 23.31238 +/- 0.003
Inclination: 7.49247 +/- 0.000
Eccentricity: 0.23804626 +/- 0.0002
Semi-Major Axis: 47.43524022 +/- 0.0131
Time of Perihelion: 2460399.0789 +/- 17.9
Perihelion: 36.14345857 +/- 0.0129
Aphelion: 58.72702188 +/- 0.0182
Period (y) 326.7081 +/- 0.14
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -4.38979772 +/- 0.0002
Ecliptic Y 35.62777954 +/- 0.0017
Ecliptic Z 4.53166462 +/- 0.0002
Ecliptic XDOT -0.00314474 +/- 0.0000
Ecliptic YDOT -0.00046656 +/- 0.0000
Ecliptic ZDOT 0.00010732 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 36.18210860 +/- 0.0017
Geocenter to KBO 35.22544703 +/- 0.0018
# Hcoef: 7.35
The following table shows the complete astrometric record for 20YP30. 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 (20YP30) followed by the observatory code and reference code for the source of the astrometry.
2020 12 17.49676 06 33 51.571 +30 36 55.40 22.8r 20YP30 568 C~7xYa 2020 12 17.63088 06 33 50.718 +30 36 56.46 22.8r 20YP30 568 C~7xYa 2021 01 19.12606 06 30 24.758 +30 39 07.63 22.8r 20YP30 304 C~7xYa 2021 01 19.15221 06 30 24.612 +30 39 07.82 22.8r 20YP30 304 C~7xYa 2021 02 08.237970 06 28 39.930 +30 38 11.50 22.9G 20YP30 T12 C~7xYa 2021 02 08.263394 06 28 39.816 +30 38 11.38 22.9G 20YP30 T12 C~7xYa 2024 02 05.12379 06 55 12.967 +30 24 26.88 22.8r 20YP30 304 C~7xYa 2024 02 05.16832 06 55 12.746 +30 24 26.59 22.8r 20YP30 304 C~7xYa 2024 02 13.13630 06 54 33.978 +30 24 13.75 22.8r 20YP30 G37 C~7xYa 2024 02 13.20434 06 54 33.647 +30 24 13.57 22.8r 20YP30 G37 C~7xYa 2025 02 23.118980 07 02 33.083 +30 14 47.90 23.1G 20YP30 G37 C~8il3 2025 02 23.163440 07 02 32.901 +30 14 47.71 20YP30 G37 C~8il3
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 -0.09 0.00 0.09
2 0.0004 -11.05 -0.01 0.41 0.14
3 0.0893 -2672.63 -0.00 -15.37 -0.16
4 0.0894 -2674.52 0.13 -15.28 0.05
5 0.1444 -4021.39 -0.02 -138.35 -0.01
6 0.1445 -4022.85 -0.02 -138.54 -0.01
7 3.1338 16598.74 0.09 624.55 0.15
8 3.1339 16595.91 0.31 623.96 -0.10
9 3.1558 16095.39 -0.07 558.02 -0.22
10 3.1559 16091.13 -0.30 557.39 -0.24
11 4.1851 22377.38 0.09 701.57 0.16
12 4.1853 22375.04 -0.12 701.09 0.15
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.
20YP30 quality flag:3 Type: 2:1E 2:1E 2:1E axisobj 48.208 48.253 48.164 ecceobj 0.248 0.249 0.248 incobj 7.477 7.477 7.477 qmin 35.660 35.606 35.476 qmax 60.524 60.665 60.728 amean 47.798 47.798 47.798 amin 47.296 47.285 47.283 amax 48.394 48.419 48.401 emean 0.231 0.234 0.236 emin 0.201 0.211 0.215 emax 0.253 0.254 0.256 imean 7.872 7.696 7.602 imin 7.126 7.050 7.012 imax 8.977 8.594 8.375 excite_mean 0.268 0.270 0.271 fracstop 1.000 1.000 1.000 cjmean 3.059 3.058 3.057 libcent 0 82.4 82.1 82.0 libamp 0 29.9 31.5 31.5 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 176.1 188.1 190.0 kozaiamp 179.9 180.0 179.9