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: 21RG237 # Created Sun Apr 27 01:11:27 2025 # Orbit generated from Bernstein formalism # Fitting 10 observations of 10 # Arc: 2.11y # First observation: 2019/08/29 # Last observation: 2021/10/07 Preliminary a, adot, b, bdot, g, gdot: 0.000023 0.026343 0.000001 -0.000629 0.025698 0.000000 # Chi-squared of fit: 1.95 DOF: 14 RMS: 0.08 # Min/Max residuals: -0.13 0.15 # Exact a, adot, b, bdot, g, gdot: 1.609076E-05 2.632481E-02 -2.125234E-07 -6.288742E-04 2.560406E-02 1.556576E-04 # Covariance matrix: 6.4156E-13 5.2751E-13 1.7289E-15 -1.7965E-14 1.2697E-12 1.3495E-11 5.2751E-13 4.6950E-12 1.4290E-14 -1.2171E-13 4.7559E-12 9.2169E-11 1.7289E-15 1.4290E-14 3.5097E-13 -1.9087E-13 1.3466E-14 2.9512E-13 -1.7965E-14 -1.2171E-13 -1.9087E-13 1.8120E-13 -1.2412E-13 -2.4924E-12 1.2697E-12 4.7559E-12 1.3466E-14 -1.2412E-13 6.5026E-12 9.3678E-11 1.3495E-11 9.2169E-11 2.9512E-13 -2.4924E-12 9.3678E-11 1.8882E-09 # lat0 lon0 xBary yBary zBary JD0 -1.832760 -8.813511 0.268973 -0.030947 -0.967307 2458724.712719 # Heliocentric elements and errors Epoch: 2458720.5000 = 2019/08/25 Mean Anomaly: 1.37770 +/- 1.179 Argument of Peri: 230.74635 +/- 1.373 Long of Asc Node: 118.44798 +/- 0.019 Inclination: 2.25832 +/- 0.001 Eccentricity: 0.07400084 +/- 0.0002 Semi-Major Axis: 43.22612272 +/- 0.0118 Time of Perihelion: 2458323.2456 +/- 340.0 Perihelion: 40.02735351 +/- 0.0130 Aphelion: 46.42489192 +/- 0.0145 Period (y) 284.2023 +/- 0.12 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 39.49340689 +/- 0.0038 Ecliptic Y -6.40216520 +/- 0.0006 Ecliptic Z -1.24911610 +/- 0.0001 Ecliptic XDOT 0.00045407 +/- 0.0000 Ecliptic YDOT 0.00278004 +/- 0.0000 Ecliptic ZDOT -0.00006797 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 40.02845486 +/- 0.0038 Geocenter to KBO 39.05631325 +/- 0.0039 # Hcoef: 8.94
The following table shows the complete astrometric record for 21RG237. 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 (21RG237) followed by the observatory code and reference code for the source of the astrometry.
2019 08 29.211918 23 30 30.795 -05 10 42.61 24.8r 21RG237 W84 C~7XPn 2019 08 29.387113 23 30 30.004 -05 10 47.75 24.8r 21RG237 W84 C~7XPn 2019 09 28.012277 23 28 14.618 -05 25 27.47 24.8r 21RG237 W84 C~7XPn 2019 09 28.177548 23 28 13.869 -05 25 31.97 24.8r 21RG237 W84 C~7XPn 2020 10 16.001792 23 32 33.169 -04 59 53.08 24.9r 21RG237 W84 C~7XPn 2020 10 16.175804 23 32 32.470 -04 59 57.33 24.9r 21RG237 W84 C~7XPn 2021 09 09.073508 23 40 55.070 -04 08 25.62 24.9r 21RG237 W84 C~7XPn 2021 09 09.192572 23 40 54.518 -04 08 29.09 24.9r 21RG237 W84 C~7XPn 2021 10 07.004805 23 38 48.126 -04 22 04.09 24.9r 21RG237 W84 C~7XPn 2021 10 07.169933 23 38 47.394 -04 22 08.75 24.9r 21RG237 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 0.03 0.00 -0.04
2 0.0005 -12.89 -0.06 -0.06 0.02
3 0.0816 -2218.12 -0.07 -11.26 -0.06
4 0.0820 -2230.17 0.08 -10.99 0.09
5 1.1329 1936.31 0.15 -125.62 0.03
6 1.1334 1925.03 -0.13 -125.39 -0.04
7 2.0311 10057.75 -0.01 -269.52 -0.11
8 2.0314 10048.78 0.05 -269.41 0.01
9 2.1076 7985.99 0.08 -265.06 0.12
10 2.1080 7974.08 -0.13 -264.98 -0.02
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.
21RG237 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 43.267 43.297 43.238 ecceobj 0.076 0.076 0.075 incobj 2.259 2.259 2.259 qmin 38.666 38.706 38.885 qmax 47.917 47.902 47.689 amean 43.159 43.188 43.128 amin 42.809 42.840 42.782 amax 43.528 43.556 43.509 emean 0.081 0.081 0.076 emin 0.057 0.057 0.056 emax 0.101 0.100 0.096 imean 1.966 1.952 1.885 imin 0.511 0.512 0.509 imax 3.174 3.130 2.989 excite_mean 0.089 0.088 0.084 fracstop 1.000 1.000 1.000 cjmean 3.082 3.082 3.083 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 180.1 180.6 175.1 kozaiamp 180.0 180.0 180.0