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: 21RA237 # Created Mon Apr 28 01:11:27 2025 # Orbit generated from Bernstein formalism # Fitting 8 observations of 8 # Arc: 2.03y # First observation: 2019/09/27 # Last observation: 2021/10/07 Preliminary a, adot, b, bdot, g, gdot: 0.000035 0.032553 -0.000000 -0.000980 0.027943 0.000000 # Chi-squared of fit: 2.27 DOF: 10 RMS: 0.09 # Min/Max residuals: -0.20 0.20 # Exact a, adot, b, bdot, g, gdot: 1.881546E-05 3.293335E-02 -3.070080E-07 -9.906077E-04 2.804895E-02 5.830227E-03 # Covariance matrix: 7.3181E-13 -1.2151E-12 -4.0869E-15 2.6249E-14 -6.2403E-13 -1.3033E-11 -1.2151E-12 1.0086E-11 4.5030E-14 -3.0378E-13 1.1060E-11 1.5092E-10 -4.0869E-15 4.5030E-14 6.1782E-13 -3.4640E-13 4.9871E-14 6.9185E-13 2.6249E-14 -3.0378E-13 -3.4640E-13 2.8551E-13 -3.4919E-13 -4.6799E-12 -6.2403E-13 1.1060E-11 4.9871E-14 -3.4919E-13 1.5910E-11 1.7354E-10 -1.3033E-11 1.5092E-10 6.9185E-13 -4.6799E-12 1.7354E-10 2.3250E-09 # lat0 lon0 xBary yBary zBary JD0 -0.669601 -10.598355 -0.248502 -0.011308 -0.968650 2458753.515384 # Heliocentric elements and errors Epoch: 2458750.5000 = 2019/09/24 Mean Anomaly: 18.24174 +/- 0.088 Argument of Peri: 160.22803 +/- 0.243 Long of Asc Node: 149.08562 +/- 0.011 Inclination: 1.84395 +/- 0.001 Eccentricity: 0.36684812 +/- 0.0010 Semi-Major Axis: 54.13095950 +/- 0.0352 Time of Perihelion: 2451379.4278 +/- 34.7 Perihelion: 34.27311862 +/- 0.0580 Aphelion: 73.98880038 +/- 0.0720 Period (y) 398.2693 +/- 0.39 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 36.04237128 +/- 0.0050 Ecliptic Y -6.49759874 +/- 0.0009 Ecliptic Z -0.41667091 +/- 0.0001 Ecliptic XDOT 0.00115796 +/- 0.0000 Ecliptic YDOT 0.00305622 +/- 0.0000 Ecliptic ZDOT -0.00010357 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 36.62574138 +/- 0.0049 Geocenter to KBO 35.65195686 +/- 0.0051 # Hcoef: 9.27
The following table shows the complete astrometric record for 21RA237. 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 (21RA237) followed by the observatory code and reference code for the source of the astrometry.
2019 09 27.014583 23 22 05.316 -04 48 41.34 24.8r 21RA237 W84 C~7XPn 2019 09 27.176040 23 22 04.540 -04 48 46.17 24.8r 21RA237 W84 C~7XPn 2020 10 17.010669 23 27 34.902 -04 17 15.00 24.9r 21RA237 W84 C~7XPn 2020 10 17.174574 23 27 34.252 -04 17 19.16 24.9r 21RA237 W84 C~7XPn 2021 09 05.096099 23 37 45.471 -03 15 07.63 24.9r 21RA237 W84 C~7XPn 2021 09 05.195929 23 37 44.962 -03 15 10.86 24.9r 21RA237 W84 C~7XPn 2021 10 07.004805 23 35 13.137 -03 31 44.27 24.8r 21RA237 W84 C~7XPn 2021 10 07.169933 23 35 12.380 -03 31 49.27 24.8r 21RA237 W84 C~7XPn
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 -0.05
2 0.0004 -12.56 0.05 0.11 0.03
3 1.0568 5274.09 -0.02 -203.78 0.07
4 1.0572 5263.51 0.03 -203.77 -0.03
5 1.9414 15167.86 0.20 -395.47 0.01
6 1.9416 15159.54 -0.20 -395.41 0.10
7 2.0287 12667.28 0.07 -405.86 0.02
8 2.0292 12654.85 -0.07 -405.96 -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.
21RA237 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 54.047 54.199 53.899 ecceobj 0.365 0.369 0.362 incobj 1.837 1.837 1.837 qmin 32.021 33.537 33.206 qmax 91.419 77.587 88.282 amean 55.907 54.129 55.025 amin 51.517 52.764 52.079 amax 62.213 55.854 61.174 emean 0.392 0.361 0.378 emin 0.353 0.339 0.346 emax 0.470 0.389 0.447 imean 4.481 3.921 2.994 imin 1.233 1.233 1.233 imax 8.793 5.562 4.882 excite_mean 0.400 0.367 0.382 fracstop 1.000 1.000 1.000 cjmean 3.035 3.051 3.046 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 176.6 186.2 179.2 kozaiamp 179.9 179.9 180.0