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: 138628 # Created Fri Apr 19 01:07:28 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 32 observations of 33 # Arc: 18.05y # First observation: 2000/08/25 # Last observation: 2018/09/13 # Chi-squared of fit: 157.48 DOF: 58 RMS: 0.39 # Min/Max residuals: -0.95 0.68 # Exact a, adot, b, bdot, g, gdot: 1.633815E-05 3.262424E-02 6.345769E-06 9.195031E-03 2.933696E-02 5.833465E-03 # Covariance matrix: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 # lat0 lon0 xBary yBary zBary JD0 -0.184175 -4.366139 0.403513 -0.003123 -0.923484 2451781.810033 # Heliocentric elements and errors Epoch: 2451782.5000 = 2000/08/26 Mean Anomaly: 25.77879 +/- 0.000 Argument of Peri: 314.82907 +/- 0.000 Long of Asc Node: 355.61946 +/- 0.000 Inclination: 15.68841 +/- 0.000 Eccentricity: 0.26898599 +/- 0.0000 Semi-Major Axis: 44.99017434 +/- 0.0000 Time of Perihelion: 2443889.6308 +/- 0.0 Perihelion: 32.88844791 +/- 0.0000 Aphelion: 57.09190077 +/- 0.0000 Period (y) 301.7760 +/- 0.00 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 34.88335522 +/- 0.0000 Ecliptic Y -3.06277035 +/- 0.0000 Ecliptic Z -0.10937602 +/- 0.0000 Ecliptic XDOT 0.00077008 +/- 0.0000 Ecliptic YDOT 0.00299947 +/- 0.0000 Ecliptic ZDOT 0.00085652 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 35.01762556 +/- 0.0000 Geocenter to KBO 34.08661971 +/- 0.0000 # Hcoef: 7.50
The following table shows the complete astrometric record for 138628. 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 (138628) followed by the observatory code and reference code for the source of the astrometry.
2000 08 25.30929 23 44 15.85 -01 54 15.8 22.2R 138628 807 Cd1703 2000 08 25.36669 23 44 15.56 -01 54 17.2 138628 807 Cd1703 2000 08 26.31447 23 44 10.95 -01 54 41.9 22.3R 138628 807 Cd1703 2000 08 26.38655 23 44 10.61 -01 54 43.6 138628 807 Cd1703 2000 08 28.30428 23 44 01.18 -01 55 33.9 22.5R 138628 807 Cd1703 2000 08 28.38010 23 44 00.79 -01 55 35.7 138628 807 Cd1703 2001 08 20.25131 23 50 40.20 -00 38 57.3 21.3R 138628 807 Cd7651 2001 08 20.32754 23 50 39.84 -00 38 59.2 138628 807 Cd7651 2001 09 25.40888 23 47 36.25 -00 55 24.7 138628 568 Cd5768 2001 09 25.43622 23 47 36.13 -00 55 25.4 138628 568 Cd5768 2001 09 26.43116 23 47 30.85 -00 55 54.2 138628 568 Cd5768 2002 09 10.43622 23 54 53.49 +00 24 25.0 22.1R 138628 662 Cg3073 2002 09 10.48823 23 54 53.23 +00 24 23.8 138628 662 Cg3073 2003 07 08.56118 00 04 15.99 +01 51 14.7 22.1R 138628 568 Ci2629 2003 07 09.56437 00 04 15.32 +01 51 18.0 138628 568 Ci2629 2005 12 01.13015 00 06 37.14 +03 24 10.6 22.8R 138628 695 Cp9826 2005 12 01.17084 00 06 37.06 +03 24 10.3 138628 695 Cp9826 2005 12 02.11789 00 06 35.79 +03 24 02.6 138628 695 Cp9826 2006 09 25.32395 00 16 42.46 +04 58 18.7 22.7R 138628 688 Cs0760 2006 09 25.40256 00 16 41.88 +04 58 15.0 138628 688 Cs0760 2007 09 12.36674 00 23 28.65 +06 11 56.4 138628 695 Cw0029 2007 09 12.40757 00 23 28.44 +06 11 55.4 138628 695 Cw0029 2007 09 17.35312 00 23 03.67 +06 09 48.1 138628 675 Cy7501 2007 09 17.35864 00 23 03.62 +06 09 48.4 138628 675 Cy7501 2007 09 17.39520 00 23 03.45 +06 09 47.3 138628 675 Cy7501 2007 09 17.40072 00 23 03.42 +06 09 47.1 22.6R 138628 675 Cy7501 2008 09 09.31976 00 29 15.60 +07 19 27.2 25.1R 138628 250 S~06HP 2008 09 09.32601 00 29 15.57 +07 19 27.1 138628 250 S~06HP 2008 09 09.33226 00 29 15.54 +07 19 27.0 138628 250 S~06HP 2008 09 09.38643 00 29 15.28 +07 19 25.7 138628 250 S~06HP 2018 09 13.362900 01 22 58.43 +17 19 47.9 23.5G 138628 705 C~2wYe 2018 09 13.434560 01 22 58.13 +17 19 46.6 23.9G 138628 705 C~2wYe 2018 09 14.394970 01 22 54.03 +17 19 33.8 23.5G 138628 705 C~2wYe
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 0.35 0.00 -0.16
2 0.0002 0.00 0.23 0.00 -0.08
3 0.0028 0.00 0.03 0.00 -0.20
4 0.0029 0.00 0.28 0.00 -0.03
5 0.0082 0.00 0.20 0.00 0.17
6 0.0084 0.00 0.08 0.00 0.39
7 0.9855 0.00 0.08 0.00 0.10
8 0.9857 0.00 -0.11 0.00 -0.04
9 1.0845 0.00 -0.95 0.00 -0.24
10 1.0845 0.00 -0.54 0.00 -0.15
11 1.0873 0.00 -0.75 0.00 -0.25
12 2.0428 0.00 -0.17 0.00 0.23
13 2.0429 0.00 0.04 0.00 0.49
14 2.8672 0.00 0.47 0.00 -0.26
15 2.8700 0.00 0.42 0.00 -0.32
16 5.2671 0.00 0.32 0.00 0.35
17 5.2672 0.00 0.04 0.00 0.39
18 5.2698 0.00 0.43 0.00 0.34
19 6.0835 0.00 ( 2.74) 0.00 ( 1.14)
20 6.0838 0.00 0.31 0.00 -0.32
21 7.0474 0.00 0.05 0.00 0.15
22 7.0475 0.00 -0.02 0.00 0.16
23 7.0610 0.00 0.68 0.00 -0.77
24 7.0611 0.00 0.36 0.00 -0.32
25 7.0612 0.00 0.64 0.00 -0.46
26 7.0612 0.00 0.62 0.00 -0.52
27 8.0411 0.00 -0.69 0.00 0.38
28 8.0411 0.00 -0.69 0.00 0.43
29 8.0411 0.00 -0.69 0.00 0.47
30 8.0413 0.00 -0.69 0.00 0.42
31 18.0508 0.00 -0.01 0.00 0.23
32 18.0510 0.00 0.14 0.00 -0.14
33 18.0536 0.00 0.17 0.00 -0.22
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.
138628 quality flag:2 Type: SCATNEAR SCATNEAR CENTAURR axisobj 45.096 45.097 45.096 ecceobj 0.271 0.271 0.271 incobj 15.677 15.677 15.677 qmin 31.262 30.854 29.895 qmax 59.361 64.340 63.468 amean 44.413 45.835 44.126 amin 43.172 44.308 39.647 amax 46.021 47.964 47.404 emean 0.265 0.293 0.280 emin 0.231 0.244 0.213 emax 0.299 0.346 0.345 imean 15.667 14.954 12.968 imin 13.898 12.628 7.851 imax 17.556 17.275 17.308 excite_mean 0.379 0.391 0.362 fracstop 1.000 1.000 0.711 cjmean 2.933 2.935 2.944 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 180.0 179.4 189.4 kozaiamp 180.0 180.0 179.9