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: 21RW237 # Created Sun Apr 27 01:11:27 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 2.02y # First observation: 2019/09/29 # Last observation: 2021/10/05 Preliminary a, adot, b, bdot, g, gdot: 0.000005 0.007600 -0.000003 -0.002864 0.013108 0.000000 # Chi-squared of fit: 2.32 DOF: 10 RMS: 0.10 # Min/Max residuals: -0.21 0.17 # Exact a, adot, b, bdot, g, gdot: 9.214047E-06 7.675479E-03 -3.688151E-06 -2.892112E-03 1.322402E-02 4.908855E-03 # Covariance matrix: 7.0231E-13 -1.0409E-12 -4.1673E-14 2.5904E-13 -8.8117E-13 -4.4069E-11 -1.0409E-12 1.1638E-11 7.1264E-13 -4.4502E-12 2.1917E-11 7.5725E-10 -4.1673E-14 7.1264E-13 6.6094E-13 -6.2514E-13 1.3955E-12 4.7603E-11 2.5904E-13 -4.4502E-12 -6.2514E-13 2.0247E-12 -8.7270E-12 -2.9733E-10 -8.8117E-13 2.1917E-11 1.3955E-12 -8.7270E-12 4.7150E-11 1.4851E-09 -4.4069E-11 7.5725E-10 4.7603E-11 -2.9733E-10 1.4851E-09 5.0594E-08 # lat0 lon0 xBary yBary zBary JD0 -0.469331 -9.294194 -0.259606 -0.007894 -0.965439 2458755.514497 # Heliocentric elements and errors Epoch: 2458750.5000 = 2019/09/24 Mean Anomaly: 58.06828 +/- 2.529 Argument of Peri: 61.95681 +/- 1.025 Long of Asc Node: 169.66644 +/- 0.000 Inclination: 20.67142 +/- 0.004 Eccentricity: 0.51899801 +/- 0.0177 Semi-Major Axis: 78.15441050 +/- 1.8633 Time of Perihelion: 2418043.8705 +/- 1011.4 Perihelion: 37.59242698 +/- 1.6463 Aphelion: 118.71639402 +/- 3.1493 Period (y) 690.9370 +/- 24.71 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 75.62259918 +/- 0.0388 Ecliptic Y -12.11912698 +/- 0.0063 Ecliptic Z -0.61971922 +/- 0.0003 Ecliptic XDOT 0.00126323 +/- 0.0000 Ecliptic YDOT 0.00140582 +/- 0.0000 Ecliptic ZDOT -0.00060731 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 76.59004372 +/- 0.0383 Geocenter to KBO 75.61999550 +/- 0.0393 # Hcoef: 6.29
The following table shows the complete astrometric record for 21RW237. 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 (21RW237) followed by the observatory code and reference code for the source of the astrometry.
2019 09 29.013696 23 26 35.049 -04 06 53.41 25.0r 21RW237 W84 C~7XPo 2019 09 29.177510 23 26 34.643 -04 06 56.31 25.0r 21RW237 W84 C~7XPo 2020 10 17.010669 23 27 44.658 -04 10 41.87 25.2r 21RW237 W84 C~7XPo 2020 10 17.174574 23 27 44.308 -04 10 44.30 25.2r 21RW237 W84 C~7XPo 2021 09 07.105479 23 31 13.342 -03 57 57.03 24.9r 21RW237 W84 C~7XPo 2021 09 07.194942 23 31 13.098 -03 57 59.02 24.9r 21RW237 W84 C~7XPo 2021 10 05.001523 23 30 03.865 -04 06 09.48 25.1r 21RW237 W84 C~7XPo 2021 10 05.173614 23 30 03.452 -04 06 12.32 25.1r 21RW237 W84 C~7XPo
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 0.05
2 0.0004 -6.73 0.03 -0.28 -0.01
3 1.0513 867.33 -0.02 -620.05 -0.03
4 1.0518 861.56 -0.04 -620.22 -0.03
5 1.9414 4038.80 0.17 -1148.80 0.04
6 1.9416 4034.66 -0.20 -1149.18 -0.21
7 2.0178 2888.91 0.02 -1190.87 0.09
8 2.0182 2882.11 0.03 -1191.04 0.11
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.
21RW237 quality flag:1 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 77.725 83.646 73.191 ecceobj 0.513 0.564 0.464 incobj 20.625 20.633 20.616 qmin 36.601 35.210 37.919 qmax 120.868 135.070 110.187 amean 77.663 83.538 73.037 amin 76.606 82.195 72.092 amax 79.228 85.527 74.425 emean 0.514 0.563 0.465 emin 0.500 0.546 0.451 emax 0.528 0.579 0.481 imean 20.313 20.445 20.178 imin 19.705 19.537 19.559 imax 21.165 21.598 20.871 excite_mean 0.620 0.663 0.579 fracstop 1.000 1.000 1.000 cjmean 2.972 2.940 3.001 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 201.0 205.1 187.9 kozaiamp 145.0 180.0 180.0