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: 17CT58 # Created Mon Apr 28 01:11:04 2025 # Orbit generated from Bernstein formalism # Fitting 14 observations of 14 # Arc: 90.80d # First observation: 2017/01/26 # Last observation: 2017/04/27 Preliminary a, adot, b, bdot, g, gdot: -0.000009 0.028726 0.000016 -0.001409 0.022231 0.000000 # Chi-squared of fit: 12.20 DOF: 22 RMS: 0.17 # Min/Max residuals: -0.31 0.31 # Exact a, adot, b, bdot, g, gdot: 1.757931E-05 2.281871E-02 -9.106383E-07 -9.765723E-04 2.132077E-02 5.651539E-03 # Covariance matrix: 3.1521E-13 -8.1573E-12 -1.8014E-14 5.1945E-13 -2.8775E-13 2.4100E-10 -8.1573E-12 5.6808E-09 1.5342E-11 -4.1395E-10 7.0199E-10 -8.4603E-08 -1.8014E-14 1.5342E-11 2.8930E-13 -2.2721E-12 1.9082E-12 -2.2669E-10 5.1945E-13 -4.1395E-10 -2.2721E-12 3.9569E-11 -5.1157E-11 6.1940E-09 -2.8775E-13 7.0199E-10 1.9082E-12 -5.1157E-11 9.2600E-11 -9.1266E-09 2.4100E-10 -8.4603E-08 -2.2669E-10 6.1940E-09 -9.1266E-09 1.5791E-06 # lat0 lon0 xBary yBary zBary JD0 -11.445209 151.389336 0.419070 -0.176944 -0.874864 2457780.042131 # Heliocentric elements and errors Epoch: 2457780.5000 = 2017/01/27 Mean Anomaly: 11.36845 +/- 1.823 Argument of Peri: 217.47857 +/- 6.916 Long of Asc Node: 254.08152 +/- 0.047 Inclination: 11.52887 +/- 0.002 Eccentricity: 0.51789563 +/- 0.0444 Semi-Major Axis: 91.35504400 +/- 5.4318 Time of Perihelion: 2447708.9584 +/- 1342.7 Perihelion: 44.04266564 +/- 4.8309 Aphelion: 138.66742235 +/- 9.1901 Period (y) 873.1865 +/- 77.88 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -40.94335484 +/- 0.0182 Ecliptic Y 22.80343133 +/- 0.0099 Ecliptic Z -9.30698307 +/- 0.0042 Ecliptic XDOT -0.00200288 +/- 0.0001 Ecliptic YDOT -0.00225041 +/- 0.0001 Ecliptic ZDOT -0.00026698 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 47.78048472 +/- 0.0163 Geocenter to KBO 46.90261275 +/- 0.0212 # Hcoef: 8.43
The following table shows the complete astrometric record for 17CT58. 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 (17CT58) followed by the observatory code and reference code for the source of the astrometry.
2017 01 26.54133 09 57 28.01 +00 15 55.7 25.1z 17CT58 T09 C~86us 2017 01 26.55620 09 57 27.96 +00 15 55.7 24.5z 17CT58 T09 C~86us 2017 01 26.57229 09 57 27.90 +00 15 55.7 24.6z 17CT58 T09 C~86us 2017 02 02.37981 09 57 02.08 +00 17 35.4 25.6r 17CT58 T09 C~86us 2017 02 02.56306 09 57 01.35 +00 17 38.3 25.1i 17CT58 T09 C~86us 2017 02 02.58245 09 57 01.30 +00 17 38.6 24.6i 17CT58 T09 C~86us 2017 03 22.24385 09 54 01.10 +00 35 09.3 25.9g 17CT58 T09 C~86us 2017 03 22.26961 09 54 01.02 +00 35 10.1 26.4g 17CT58 T09 C~86us 2017 03 22.33107 09 54 00.79 +00 35 11.4 26.1g 17CT58 T09 C~86us 2017 04 27.32671 09 52 47.37 +00 48 30.5 24.7i 17CT58 T09 C~86us 2017 04 27.32955 09 52 47.37 +00 48 30.5 24.8i 17CT58 T09 C~86us 2017 04 27.33527 09 52 47.33 +00 48 30.7 25.1i 17CT58 T09 C~86us 2017 04 27.33816 09 52 47.33 +00 48 30.8 25.0i 17CT58 T09 C~86us 2017 04 27.34103 09 52 47.33 +00 48 30.8 24.8i 17CT58 T09 C~86us
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 -0.14 0.00 0.04
2 0.0000 -0.70 0.02 -0.26 -0.11
3 0.0001 -1.55 0.10 -0.58 -0.31
4 0.0187 -399.28 -0.06 -42.40 0.15
5 0.0192 -410.55 -0.14 -43.50 0.09
6 0.0193 -411.36 0.23 -43.49 0.22
7 0.1498 -3311.31 0.14 -2.66 -0.02
8 0.1498 -3312.71 0.12 -2.33 0.15
9 0.1500 -3316.40 -0.28 -2.31 -0.23
10 0.2486 -4627.78 0.26 362.20 0.07
11 0.2486 -4627.78 0.31 362.20 0.04
12 0.2486 -4628.41 -0.22 362.18 -0.05
13 0.2486 -4628.45 -0.20 362.27 0.00
14 0.2486 -4628.45 -0.15 362.27 -0.03
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.
17CT58 quality flag:1 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 90.941 119.137 81.005 ecceobj 0.517 0.666 0.417 incobj 11.510 11.515 11.505 qmin 42.846 38.372 46.266 qmax 141.328 204.015 117.510 amean 90.613 117.820 80.951 amin 89.266 115.236 79.890 amax 92.549 121.772 82.343 emean 0.515 0.663 0.416 emin 0.505 0.651 0.405 emax 0.527 0.675 0.427 imean 12.777 12.489 12.905 imin 12.462 12.028 12.693 imax 13.171 13.350 13.191 excite_mean 0.560 0.697 0.472 fracstop 1.000 1.000 1.000 cjmean 3.233 3.147 3.279 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 207.1 273.5 180.8 kozaiamp 180.0 180.0 180.0