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: 17FP161 # Created Wed May 21 01:11:10 2025 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 15 observations of 15 # Arc: 8.09y # First observation: 2017/03/23 # Last observation: 2025/04/23 # Chi-squared of fit: 23.98 DOF: 24 RMS: 0.22 # Min/Max residuals: -0.60 0.57 # Exact a, adot, b, bdot, g, gdot: 1.291117E-05 1.591397E-02 -8.247334E-07 4.587244E-04 1.941592E-02 -2.020217E-03 # Covariance matrix: 3.4294E-13 -3.0105E-13 8.1400E-15 -1.0767E-14 1.1080E-13 -2.1822E-12 -3.0105E-13 6.1821E-13 -1.1660E-14 2.1603E-14 1.3058E-13 4.7165E-12 8.1400E-15 -1.1660E-14 1.5817E-13 -2.4251E-14 5.6889E-15 -9.1954E-14 -1.0767E-14 2.1603E-14 -2.4251E-14 1.1230E-14 1.9944E-15 1.6813E-13 1.1080E-13 1.3058E-13 5.6889E-15 1.9944E-15 5.2294E-13 9.2459E-13 -2.1822E-12 4.7165E-12 -9.1954E-14 1.6813E-13 9.2459E-13 3.6619E-11 # lat0 lon0 xBary yBary zBary JD0 15.375274 -152.273953 0.426159 0.238092 -0.865248 2457835.762831 # Heliocentric elements and errors Epoch: 2457836.5000 = 2017/03/24 Mean Anomaly: 244.26086 +/- 0.075 Argument of Peri: 214.30317 +/- 0.066 Long of Asc Node: 123.88256 +/- 0.001 Inclination: 15.21023 +/- 0.000 Eccentricity: 0.15937405 +/- 0.0003 Semi-Major Axis: 48.15522114 +/- 0.0062 Time of Perihelion: 2497077.6058 +/- 30.0 Perihelion: 40.48052830 +/- 0.0156 Aphelion: 55.82991397 +/- 0.0164 Period (y) 334.1745 +/- 0.06 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -44.95432874 +/- 0.0016 Ecliptic Y -23.14976852 +/- 0.0009 Ecliptic Z 13.65575818 +/- 0.0005 Ecliptic XDOT 0.00130581 +/- 0.0000 Ecliptic YDOT -0.00185720 +/- 0.0000 Ecliptic ZDOT -0.00001324 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 52.37645095 +/- 0.0015 Geocenter to KBO 51.50424433 +/- 0.0019 # Hcoef: 7.03
The following table shows the complete astrometric record for 17FP161. 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 (17FP161) followed by the observatory code and reference code for the source of the astrometry.
2017 03 23.26203 14 04 49.699 +03 42 59.68 24.3r 17FP161 807 C~2b81 2017 03 23.32312 14 04 49.516 +03 43 01.64 24.2r 17FP161 807 C~2b81 2017 04 20.20703 14 03 11.584 +03 54 15.86 17FP161 G37 C~2b81 2017 04 20.28797 14 03 11.271 +03 54 17.62 17FP161 G37 C~2b81 2017 04 24.29268 14 02 56.296 +03 55 38.61 17FP161 304 C~2b81 2017 04 25.28043 14 02 52.598 +03 55 57.86 17FP161 304 C~2b81 2018 03 11.36629 14 08 52.408 +03 19 38.64 24.2r 17FP161 304 C~2b81 2018 03 11.40495 14 08 52.305 +03 19 39.69 17FP161 304 C~2b81 2018 03 12.36674 14 08 49.873 +03 20 05.19 17FP161 304 C~2b81 2018 03 12.39202 14 08 49.819 +03 20 05.83 17FP161 304 C~2b81 2018 06 14.18710 14 03 42.433 +03 45 19.22 24.0R 17FP161 G37 C~2kSp 2018 06 14.27693 14 03 42.208 +03 45 19.21 17FP161 G37 C~2kSp 2025 04 23.366160 14 31 07.570 +01 29 14.75 23.6G 17FP161 G37 C~8sw1 2025 04 23.402270 14 31 07.443 +01 29 15.39 17FP161 G37 C~8sw1 2025 04 23.445820 14 31 07.275 +01 29 16.46 17FP161 G37 C~8sw1
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 0.10 0.00 0.23
2 0.0002 0.00 0.27 0.00 0.57
3 0.0765 0.00 0.02 0.00 0.03
4 0.0767 0.00 -0.07 0.00 0.10
5 0.0877 0.00 0.08 0.00 0.13
6 0.0904 0.00 0.02 0.00 0.28
7 0.9667 0.00 -0.21 0.00 -0.06
8 0.9669 0.00 -0.26 0.00 -0.04
9 0.9695 0.00 -0.04 0.00 -0.22
10 0.9696 0.00 0.15 0.00 -0.25
11 1.2264 0.00 0.05 0.00 -0.60
12 1.2266 0.00 -0.29 0.00 -0.35
13 8.0852 0.00 -0.09 0.00 0.08
14 8.0853 0.00 0.09 0.00 -0.03
15 8.0854 0.00 0.09 0.00 0.15
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.
17FP161 quality flag:3 Type: 2:1E 2:1E 2:1E axisobj 47.579 47.579 47.579 ecceobj 0.168 0.168 0.168 incobj 15.214 15.214 15.214 qmin 37.817 37.728 37.908 qmax 58.406 58.430 58.318 amean 47.796 47.796 47.796 amin 47.271 47.262 47.274 amax 48.392 48.404 48.376 emean 0.160 0.162 0.168 emin 0.111 0.098 0.128 emax 0.207 0.208 0.206 imean 13.348 13.265 13.148 imin 11.848 11.771 11.922 imax 14.500 15.011 14.672 excite_mean 0.282 0.282 0.284 fracstop 1.000 1.000 1.000 cjmean 3.049 3.049 3.048 libcent 0 176.4 177.1 176.6 libamp 0 139.2 139.8 139.5 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 240.5 236.0 238.7 kozaiamp 31.2 51.4 38.3