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: 20UH74 # Created Mon Apr 28 01:11:24 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 0.96y # First observation: 2020/10/20 # Last observation: 2021/10/06 Preliminary a, adot, b, bdot, g, gdot: 0.000002 0.022032 0.000000 0.001131 0.023572 0.000000 # Chi-squared of fit: 1.24 DOF: 10 RMS: 0.07 # Min/Max residuals: -0.11 0.11 # Exact a, adot, b, bdot, g, gdot: 1.475750E-05 2.201121E-02 1.228462E-06 1.127330E-03 2.340686E-02 5.035680E-04 # Covariance matrix: 8.4177E-13 5.1185E-11 -3.2611E-14 2.3738E-12 3.9252E-11 2.3213E-09 5.1185E-11 5.6337E-09 -3.5551E-12 2.5900E-10 4.2766E-09 2.5333E-07 -3.2611E-14 -3.5551E-12 3.7093E-13 -5.6314E-13 -2.7061E-12 -1.5999E-10 2.3738E-12 2.5900E-10 -5.6314E-13 1.2775E-11 1.9689E-10 1.1652E-08 3.9252E-11 4.2766E-09 -2.7061E-12 1.9689E-10 3.2581E-09 1.9251E-07 2.3213E-09 2.5333E-07 -1.5999E-10 1.1652E-08 1.9251E-07 1.1396E-05 # lat0 lon0 xBary yBary zBary JD0 -3.104064 -7.267347 -0.563082 -0.044361 -0.816998 2459142.505034 # Heliocentric elements and errors Epoch: 2459140.5000 = 2020/10/18 Mean Anomaly: 111.45349 +/- 84.879 Argument of Peri: 198.39988 +/- 84.446 Long of Asc Node: 39.17317 +/- 0.047 Inclination: 4.25045 +/- 0.003 Eccentricity: 0.04165970 +/- 0.1369 Semi-Major Axis: 42.83426548 +/- 0.2005 Time of Perihelion: 2427439.2360 +/- 24141.6 Perihelion: 41.04980283 +/- 5.8652 Aphelion: 44.61872812 +/- 5.8658 Period (y) 280.3465 +/- 1.97 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 43.20622301 +/- 0.1032 Ecliptic Y -4.94715900 +/- 0.0132 Ecliptic Z -2.31339093 +/- 0.0056 Ecliptic XDOT 0.00039837 +/- 0.0004 Ecliptic YDOT 0.00255070 +/- 0.0000 Ecliptic ZDOT 0.00012826 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 43.55001569 +/- 0.1024 Geocenter to KBO 42.72252503 +/- 0.1042 # Hcoef: 8.17
The following table shows the complete astrometric record for 20UH74. 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 (20UH74) followed by the observatory code and reference code for the source of the astrometry.
2020 10 20.004233 23 38 14.091 -05 44 05.68 24.5r 20UH74 W84 C~7XOQ 2020 10 20.172968 23 38 13.477 -05 44 08.74 24.5r 20UH74 W84 C~7XOQ 2020 10 22.003924 23 38 07.146 -05 44 43.20 24.5r 20UH74 W84 C~7XOQ 2020 10 22.173214 23 38 06.548 -05 44 46.33 24.5r 20UH74 W84 C~7XOQ 2021 09 09.073508 23 45 38.121 -04 53 13.49 24.4r 20UH74 W84 C~7XOQ 2021 09 09.192572 23 45 37.587 -04 53 16.72 24.4r 20UH74 W84 C~7XOQ 2021 10 06.002765 23 43 42.703 -05 05 07.75 24.5r 20UH74 W84 C~7XOQ 2021 10 06.167954 23 43 42.004 -05 05 11.77 24.5r 20UH74 W84 C~7XOQ
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 0.02 0.00 -0.10
2 0.0005 -9.63 -0.02 0.82 0.11
3 0.0055 -110.03 0.05 6.66 -0.02
4 0.0059 -119.47 -0.06 7.32 0.01
5 0.8873 7301.73 0.11 160.85 -0.11
6 0.8876 7293.11 -0.11 161.07 0.05
7 0.9610 5433.46 0.06 194.01 -0.00
8 0.9614 5422.27 -0.06 194.48 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.
20UH74 quality flag:1 Type: CLASSICAL SCATNEAR CLASSICAL axisobj 42.737 50.628 42.594 ecceobj 0.039 0.388 0.026 incobj 4.249 4.242 4.251 qmin 40.128 30.497 36.695 qmax 45.354 86.159 48.699 amean 42.631 51.541 42.486 amin 42.303 47.914 42.107 amax 42.961 58.957 42.868 emean 0.034 0.368 0.069 emin 0.013 0.331 0.016 emax 0.056 0.462 0.136 imean 3.023 9.085 3.395 imin 1.866 3.717 1.707 imax 4.060 11.781 4.587 excite_mean 0.063 0.402 0.093 fracstop 1.000 1.000 1.000 cjmean 3.081 2.983 3.072 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 184.7 185.0 176.5 kozaiamp 179.9 179.9 180.0