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: 20UC74 # Created Fri Nov 22 02:11:07 2024 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 2.08y # First observation: 2019/08/30 # Last observation: 2021/09/29 Preliminary a, adot, b, bdot, g, gdot: 0.000000 0.026490 0.000025 -0.010622 0.026647 0.000000 # Chi-squared of fit: 1.42 DOF: 10 RMS: 0.07 # Min/Max residuals: -0.16 0.16 # Exact a, adot, b, bdot, g, gdot: 1.568040E-05 2.646475E-02 -6.608780E-06 -1.062117E-02 2.657293E-02 3.221129E-04 # Covariance matrix: 7.3600E-13 -1.4652E-13 3.2133E-15 -2.4430E-14 6.5372E-13 1.1172E-12 -1.4652E-13 2.0855E-11 1.7275E-12 -7.5626E-12 2.4381E-11 3.4981E-10 3.2133E-15 1.7275E-12 7.3329E-13 -1.0106E-12 2.0118E-12 2.9729E-11 -2.4430E-14 -7.5626E-12 -1.0106E-12 3.1463E-12 -8.8348E-12 -1.2996E-10 6.5372E-13 2.4381E-11 2.0118E-12 -8.8348E-12 3.0007E-11 4.0862E-10 1.1172E-12 3.4981E-10 2.9729E-11 -1.2996E-10 4.0862E-10 6.0115E-09 # lat0 lon0 xBary yBary zBary JD0 -2.416910 -7.965011 0.266845 -0.040825 -0.967388 2458725.713221 # Heliocentric elements and errors Epoch: 2458720.5000 = 2019/08/25 Mean Anomaly: 2.75557 +/- 1.054 Argument of Peri: 182.68947 +/- 1.375 Long of Asc Node: 165.77981 +/- 0.000 Inclination: 21.98855 +/- 0.001 Eccentricity: 0.12781277 +/- 0.0002 Semi-Major Axis: 44.25165637 +/- 0.0215 Time of Perihelion: 2457897.4962 +/- 314.7 Perihelion: 38.59572976 +/- 0.0202 Aphelion: 49.90758297 +/- 0.0254 Period (y) 294.3761 +/- 0.21 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 38.16083981 +/- 0.0077 Ecliptic Y -5.61545804 +/- 0.0011 Ecliptic Z -1.58722231 +/- 0.0003 Ecliptic XDOT 0.00037343 +/- 0.0000 Ecliptic YDOT 0.00270278 +/- 0.0000 Ecliptic ZDOT -0.00109497 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 38.60443419 +/- 0.0076 Geocenter to KBO 37.63228087 +/- 0.0078 # Hcoef: 9.44
The following table shows the complete astrometric record for 20UC74. 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 (20UC74) followed by the observatory code and reference code for the source of the astrometry.
2019 08 30.212420 23 34 34.166 -05 22 48.04 25.2r 20UC74 W84 C~7XOQ 2019 08 30.387214 23 34 33.377 -05 22 54.49 25.2r 20UC74 W84 C~7XOQ 2020 10 20.004233 23 37 18.855 -05 49 39.51 25.3r 20UC74 W84 C~7XOQ 2020 10 20.172968 23 37 18.204 -05 49 44.07 25.3r 20UC74 W84 C~7XOQ 2020 10 22.003924 23 37 11.478 -05 50 33.25 25.3r 20UC74 W84 C~7XOQ 2020 10 22.173214 23 37 10.852 -05 50 37.84 25.3r 20UC74 W84 C~7XOQ 2021 09 29.009779 23 45 23.087 -05 35 39.08 25.1r 20UC74 W84 C~7XOQ 2021 09 29.166262 23 45 22.358 -05 35 44.87 25.1r 20UC74 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 0.01 0.00 0.06
2 0.0005 -13.37 -0.02 -1.26 -0.06
3 1.1411 1618.94 0.07 -2453.85 -0.09
4 1.1416 1608.21 -0.00 -2454.18 0.00
5 1.1466 1496.56 -0.01 -2459.50 0.10
6 1.1471 1486.16 -0.05 -2460.01 -0.00
7 2.0829 8589.50 0.05 -4564.60 0.16
8 2.0834 8577.19 -0.05 -4565.55 -0.16
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.
20UC74 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 44.291 44.322 44.259 ecceobj 0.129 0.130 0.129 incobj 21.958 21.959 21.957 qmin 37.550 37.610 37.577 qmax 51.097 51.072 50.991 amean 44.186 44.211 44.143 amin 43.817 43.855 43.777 amax 44.590 44.603 44.544 emean 0.131 0.132 0.130 emin 0.117 0.118 0.117 emax 0.147 0.146 0.146 imean 21.279 21.276 21.282 imin 20.841 20.838 20.846 imax 21.675 21.699 21.696 excite_mean 0.386 0.386 0.386 fracstop 1.000 1.000 1.000 cjmean 2.920 2.920 2.920 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 189.8 191.1 192.0 kozaiamp 180.0 180.0 180.0