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: 20UF74 # Created Mon Apr 28 01:11:24 2025 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 2.02y # First observation: 2019/09/29 # Last observation: 2021/10/04 Preliminary a, adot, b, bdot, g, gdot: 0.000000 0.025576 -0.000002 0.000828 0.025353 0.000000 # Chi-squared of fit: 2.13 DOF: 14 RMS: 0.08 # Min/Max residuals: -0.16 0.17 # Exact a, adot, b, bdot, g, gdot: 1.584867E-05 2.556858E-02 8.114024E-07 8.271556E-04 2.509727E-02 -3.287975E-05 # Covariance matrix: 7.3407E-13 -5.5842E-13 1.9661E-15 -7.8598E-15 7.2239E-13 -4.4905E-12 -5.5842E-13 1.5945E-10 -1.3756E-12 5.2323E-12 3.3561E-10 2.9466E-09 1.9661E-15 -1.3756E-12 5.5483E-13 -3.6727E-13 -2.9006E-12 -2.5463E-11 -7.8598E-15 5.2323E-12 -3.6727E-13 4.3412E-13 1.1030E-11 9.6852E-11 7.2239E-13 3.3561E-10 -2.9006E-12 1.1030E-11 7.1535E-10 6.2115E-09 -4.4905E-12 2.9466E-09 -2.5463E-11 9.6852E-11 6.2115E-09 5.4543E-08 # lat0 lon0 xBary yBary zBary JD0 -0.114208 -9.114678 -0.256580 -0.001911 -0.966278 2458755.514497 # Heliocentric elements and errors Epoch: 2458750.5000 = 2019/09/24 Mean Anomaly: 5.37790 +/- 6.420 Argument of Peri: 350.24360 +/- 7.513 Long of Asc Node: 354.68759 +/- 0.001 Inclination: 1.85111 +/- 0.001 Eccentricity: 0.07637717 +/- 0.0014 Semi-Major Axis: 44.17243889 +/- 0.1571 Time of Perihelion: 2457148.5979 +/- 1912.4 Perihelion: 40.79867320 +/- 0.1579 Aphelion: 47.54620457 +/- 0.1802 Period (y) 293.5860 +/- 1.57 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 40.33960975 +/- 0.0419 Ecliptic Y -6.21855334 +/- 0.0067 Ecliptic Z -0.07940675 +/- 0.0001 Ecliptic XDOT 0.00044698 +/- 0.0000 Ecliptic YDOT 0.00275551 +/- 0.0000 Ecliptic ZDOT 0.00009001 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 40.81618338 +/- 0.0414 Geocenter to KBO 39.84497029 +/- 0.0425 # Hcoef: 9.32
The following table shows the complete astrometric record for 20UF74. 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 (20UF74) followed by the observatory code and reference code for the source of the astrometry.
2019 09 29.013696 23 26 41.125 -03 43 03.80 25.4r 20UF74 W84 C~7XOQ 2019 09 29.177510 23 26 40.386 -03 43 08.30 25.4r 20UF74 W84 C~7XOQ 2020 10 17.010669 23 30 43.595 -03 13 51.51 25.3r 20UF74 W84 C~7XOQ 2020 10 17.174574 23 30 42.976 -03 13 55.19 25.3r 20UF74 W84 C~7XOQ 2020 10 21.004397 23 30 29.125 -03 15 22.02 25.5r 20UF74 W84 C~7XOQ 2020 10 21.174149 23 30 28.542 -03 15 25.84 25.5r 20UF74 W84 C~7XOQ 2021 10 03.011907 23 37 00.618 -02 30 24.00 25.2r 20UF74 W84 C~7XOQ 2021 10 03.165173 23 36 59.950 -02 30 28.29 25.2r 20UF74 W84 C~7XOQ 2021 10 04.002582 23 36 56.344 -02 30 51.26 25.3r 20UF74 W84 C~7XOQ 2021 10 04.175328 23 36 55.581 -02 30 55.86 25.3r 20UF74 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 0.05 0.00 -0.06
2 0.0004 -11.94 -0.05 0.22 0.01
3 1.0513 4027.63 -0.05 179.84 -0.06
4 1.0518 4017.65 0.06 180.11 0.06
5 1.0623 3792.71 -0.16 182.16 0.17
6 1.0627 3783.18 0.15 182.10 -0.06
7 2.0123 10254.48 -0.09 342.99 0.06
8 2.0127 10243.56 -0.00 343.01 -0.06
9 2.0150 10184.70 0.06 343.30 -0.10
10 2.0155 10172.35 0.03 343.61 0.04
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.
20UF74 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 44.207 44.587 43.870 ecceobj 0.078 0.082 0.079 incobj 1.855 1.854 1.855 qmin 39.974 40.087 39.419 qmax 48.399 49.056 48.352 amean 44.086 44.456 43.715 amin 43.736 44.098 43.334 amax 44.470 44.838 44.141 emean 0.074 0.079 0.070 emin 0.057 0.063 0.040 emax 0.089 0.095 0.096 imean 2.579 2.600 2.485 imin 1.790 1.855 1.498 imax 3.260 3.219 3.343 excite_mean 0.086 0.091 0.083 fracstop 1.000 1.000 1.000 cjmean 3.093 3.097 3.090 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 183.1 183.1 184.4 kozaiamp 180.0 180.0 180.0