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: 21GW122
# Created Fri May 3 01:18:44 2024
# Orbit generated from Bernstein formalism
# Fitting 16 observations of 17
# Arc: 2.05y
# First observation: 2021/04/05
# Last observation: 2023/04/24
Preliminary a, adot, b, bdot, g, gdot:
-0.000004 0.024330 -0.000001 0.000052 0.024622 0.000000
# Chi-squared of fit: 20.03 DOF: 26 RMS: 0.20
# Min/Max residuals: -0.37 0.32
# Exact a, adot, b, bdot, g, gdot:
1.587258E-05 2.430878E-02 -1.424147E-06 5.182601E-05 2.466166E-02 -5.087487E-04
# Covariance matrix:
6.3602E-13 -3.4120E-12 1.0439E-15 -7.4601E-15 4.3929E-12 -9.0358E-11
-3.4120E-12 2.3776E-11 -7.4333E-15 5.3314E-14 -2.9927E-11 6.4316E-10
1.0439E-15 -7.4333E-15 1.6624E-13 -1.0647E-13 9.5253E-15 -2.0257E-13
-7.4601E-15 5.3314E-14 -1.0647E-13 1.5220E-13 -6.7543E-14 1.4515E-12
4.3929E-12 -2.9927E-11 9.5253E-15 -6.7543E-14 4.3724E-11 -8.2507E-10
-9.0358E-11 6.4316E-10 -2.0257E-13 1.4515E-12 -8.2507E-10 1.7529E-08
# lat0 lon0 xBary yBary zBary JD0
0.475450 -161.288118 0.067466 0.008209 -1.003739 2459309.635831
# Heliocentric elements and errors
Epoch: 2459300.5000 = 2021/03/27
Mean Anomaly: 309.52077 +/- 6.875
Argument of Peri: 128.87177 +/- 7.600
Long of Asc Node: 123.12204 +/- 0.107
Inclination: 0.47918 +/- 0.000
Eccentricity: 0.03218084 +/- 0.0037
Semi-Major Axis: 42.38917104 +/- 0.0520
Time of Perihelion: 2473435.3457 +/- 1925.0
Perihelion: 41.02505211 +/- 0.1661
Aphelion: 43.75328997 +/- 0.1672
Period (y) 275.9882 +/- 0.51
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -39.36908738 +/- 0.0103
Ecliptic Y -13.27212989 +/- 0.0035
Ecliptic Z 0.33641457 +/- 0.0001
Ecliptic XDOT 0.00092542 +/- 0.0000
Ecliptic YDOT -0.00253126 +/- 0.0000
Ecliptic ZDOT 0.00000509 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 41.54741445 +/- 0.0098
Geocenter to KBO 40.54877463 +/- 0.0109
# Hcoef: 7.69
The following table shows the complete astrometric record for 21GW122. 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 (21GW122) followed by the observatory code and reference code for the source of the astrometry.
2021 04 05.13503 13 09 46.85 -06 53 30.1 21GW122 W93 C~4qrl 2021 04 05.16966 13 09 46.68 -06 53 29.8 21GW122 W93 C~4qrl 2021 04 10.464605 13 09 22.442 -06 51 01.66 23.8G 21GW122 F51 C~5XzB 2021 04 12.08818 13 09 15.05 -06 50 15.8 23.9R 21GW122 W93 C~4qrl 2021 04 12.10563 13 09 14.99 -06 50 15.1 21GW122 W93 C~4qrl 2021 04 12.14765 13 09 14.75 -06 50 14.0 23.8R 21GW122 W93 C~4qrl 2021 04 12.16501 13 09 14.70 -06 50 13.7 23.8R 21GW122 W93 C~4qrl 2021 04 14.455322 13 09 04.233 -06 49 10.24 22.9G 21GW122 F51 C~5XzB 2022 03 30.13076 13 15 26.81 -07 27 46.2 23.1R 21GW122 W93 C~5XzB 2022 03 30.16581 13 15 26.67 -07 27 45.0 23.4R 21GW122 W93 C~5XzB 2022 03 30.20301 13 15 26.52 -07 27 44.2 24.0R 21GW122 W93 C~5XzB 2022 04 01.13530 13 15 17.86 -07 26 51.5 21GW122 W93 C~5XzB 2022 04 01.16679 13 15 17.67 -07 26 50.4 23.1R 21GW122 W93 C~5XzB 2022 04 01.19285 13 15 17.53 -07 26 49.7 23.2R 21GW122 W93 C~5XzB 2023 04 24.173190 13 18 46.271 -07 47 37.30 23.6G 21GW122 G37 C~6hcZ 2023 04 24.235560 13 18 45.964 -07 47 35.51 21GW122 G37 C~6hcZ 2023 04 24.295420 13 18 45.709 -07 47 33.82 21GW122 G37 C~6hcZ
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 -0.06 0.00 0.30
2 0.0001 -2.46 0.07 -0.68 -0.37
3 0.0146 -392.63 -0.12 -0.65 -0.37
4 0.0190 -511.89 0.06 -0.03 0.00
5 0.0191 -512.98 0.26 0.28 0.32
6 0.0192 -516.71 -0.33 -0.06 0.00
7 0.0192 -517.51 0.16 -0.06 0.00
8 0.0255 -685.82 -0.05 -0.57 -0.26
9 0.9829 5462.52 -0.23 9.41 -0.03
10 0.9830 5460.14 -0.05 9.74 0.31
11 0.9831 5457.77 0.30 9.64 0.22
12 0.9884 5318.51 ( 0.84) 9.94 ( 0.21)
13 0.9885 5315.47 0.12 9.89 0.17
14 0.9885 5313.28 -0.15 9.76 0.04
15 2.0508 8662.01 0.18 19.86 -0.16
16 2.0509 8657.10 -0.19 19.81 -0.18
17 2.0511 8652.95 0.01 19.96 0.00
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.
21GW122 quality flag:2 Type: CLASSICAL CLASSICAL 5:3EE axisobj 42.306 42.543 42.088 ecceobj 0.028 0.024 0.038 incobj 0.481 0.481 0.481 qmin 40.607 40.867 39.554 qmax 44.623 44.832 45.438 amean 42.531 42.772 42.331 amin 42.200 42.444 41.994 amax 42.867 43.106 42.682 emean 0.023 0.021 0.042 emin 0.000 0.001 0.021 emax 0.042 0.041 0.065 imean 2.158 1.968 1.948 imin 0.713 0.662 0.390 imax 3.008 2.667 3.170 excite_mean 0.046 0.042 0.055 fracstop 1.000 1.000 1.000 cjmean 3.082 3.085 3.078 libcent 0 -180.0 -180.0 172.3 libamp 0 -180.0 -180.0 92.3 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 174.5 172.0 169.0 kozaiamp 180.0 180.0 180.0