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: 17FW241 # Created Sun Oct 19 01:11:49 2025 # Orbit generated from Bernstein formalism # Fitting 17 observations of 17 # Arc: 3.24y # First observation: 2016/01/09 # Last observation: 2019/04/05 Preliminary a, adot, b, bdot, g, gdot: 0.000027 0.032671 -0.000011 -0.004888 0.029901 0.000000 # Chi-squared of fit: 3.64 DOF: 28 RMS: 0.08 # Min/Max residuals: -0.15 0.24 # Exact a, adot, b, bdot, g, gdot: 1.675828E-05 3.267753E-02 -2.349302E-06 -4.890300E-03 2.988611E-02 1.926354E-03 # Covariance matrix: 3.5981E-13 -4.3254E-13 -2.7253E-14 6.1377E-14 -1.2298E-13 -4.0682E-12 -4.3254E-13 2.2078E-12 1.6664E-13 -3.5187E-13 1.6762E-12 2.3472E-11 -2.7253E-14 1.6664E-13 2.5067E-13 -1.4844E-13 1.2796E-13 1.8725E-12 6.1377E-14 -3.5187E-13 -1.4844E-13 1.5554E-13 -2.6392E-13 -3.9840E-12 -1.2298E-13 1.6762E-12 1.2796E-13 -2.6392E-13 1.5346E-12 1.7648E-11 -4.0682E-12 2.3472E-11 1.8725E-12 -3.9840E-12 1.7648E-11 2.6555E-10 # lat0 lon0 xBary yBary zBary JD0 -7.934307 152.236350 0.682546 -0.097585 -0.701527 2457397.097588 # Heliocentric elements and errors Epoch: 2457390.5000 = 2016/01/03 Mean Anomaly: 27.17983 +/- 0.279 Argument of Peri: 190.65226 +/- 0.335 Long of Asc Node: 289.48579 +/- 0.002 Inclination: 11.61092 +/- 0.000 Eccentricity: 0.07575939 +/- 0.0003 Semi-Major Axis: 36.58776981 +/- 0.0029 Time of Perihelion: 2451287.4541 +/- 62.6 Perihelion: 33.81590260 +/- 0.0104 Aphelion: 39.35963701 +/- 0.0106 Period (y) 221.3156 +/- 0.03 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -29.63764300 +/- 0.0012 Ecliptic Y 16.36941401 +/- 0.0006 Ecliptic Z -4.61889114 +/- 0.0002 Ecliptic XDOT -0.00149519 +/- 0.0000 Ecliptic YDOT -0.00260325 +/- 0.0000 Ecliptic ZDOT -0.00046804 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 34.17135867 +/- 0.0011 Geocenter to KBO 33.46036084 +/- 0.0014 # Hcoef: 9.02
The following table shows the complete astrometric record for 17FW241. 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 (17FW241) followed by the observatory code and reference code for the source of the astrometry.
2016 01 09.596799 10 05 31.51 +03 15 37.4 17FW241 T09 C~86vL 2016 01 09.61288 10 05 31.43 +03 15 37.6 23.6y 17FW241 T09 C~94uP 2016 01 09.62724 10 05 31.37 +03 15 37.8 24.5y 17FW241 T09 C~94uP 2016 01 09.655918 10 05 31.27 +03 15 38.0 17FW241 T09 C~86vL 2017 03 22.41317 10 05 55.03 +02 49 23.6 23.4z 17FW241 T09 C~86vL 2017 03 22.43886 10 05 54.91 +02 49 24.6 23.9z 17FW241 T09 C~86vL 2017 03 22.48627 10 05 54.70 +02 49 25.8 23.9z 17FW241 T09 C~86vL 2017 03 25.24382 10 05 42.27 +02 50 50.7 25.0r 17FW241 T09 C~86vL 2017 03 25.25752 10 05 42.20 +02 50 51.0 24.7r 17FW241 T09 C~86vL 2017 03 25.27122 10 05 42.14 +02 50 51.4 24.5r 17FW241 T09 C~86vL 2017 03 25.28496 10 05 42.08 +02 50 51.9 24.6r 17FW241 T09 C~86vL 2017 03 29.275308 10 05 25.02 +02 52 52.3 17FW241 T09 C~86vL 2017 03 29.303176 10 05 24.91 +02 52 53.3 17FW241 T09 C~86vL 2018 01 17.494013 10 18 09.94 +01 26 09.0 17FW241 T09 C~86vL 2018 01 17.649648 10 18 09.25 +01 26 10.8 17FW241 T09 C~86vL 2019 04 04.376876 10 18 14.87 +01 04 52.3 17FW241 T09 C~86vL 2019 04 05.371659 10 18 10.99 +01 05 22.7 17FW241 T09 C~86vL
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 0.11 0.00 -0.05
2 0.0000 -1.19 -0.11 -0.24 -0.07
3 0.0001 -2.10 -0.15 -0.36 0.00
4 0.0002 -3.57 0.12 -0.71 0.05
5 1.1987 884.61 0.04 -1348.53 -0.03
6 1.1987 882.58 -0.02 -1348.23 0.17
7 1.1989 879.21 0.24 -1348.21 -0.01
8 1.2064 675.00 0.00 -1334.43 0.08
9 1.2065 673.92 -0.07 -1334.52 -0.07
10 1.2065 672.94 -0.04 -1334.46 -0.08
11 1.2065 671.92 -0.04 -1334.31 0.01
12 1.2175 390.29 -0.07 -1311.74 -0.09
13 1.2175 388.40 -0.02 -1311.39 0.11
14 2.0230 12972.55 -0.04 -2125.70 0.02
15 2.0234 12962.20 0.05 -2127.69 -0.01
16 3.2328 13497.08 0.04 -3296.05 0.03
17 3.2355 13431.60 -0.05 -3288.20 -0.08
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.
17FW241 quality flag:3 Type: 4:3E 4:3E 4:3E axisobj 36.426 36.438 36.415 ecceobj 0.073 0.074 0.072 incobj 11.611 11.611 11.611 qmin 32.927 32.795 32.873 qmax 40.371 40.375 40.544 amean 36.480 36.481 36.480 amin 36.132 36.136 36.128 amax 36.857 36.821 36.855 emean 0.069 0.068 0.071 emin 0.044 0.042 0.046 emax 0.098 0.099 0.101 imean 15.857 15.708 16.041 imin 13.028 12.589 13.103 imax 17.704 17.577 17.906 excite_mean 0.282 0.279 0.286 fracstop 1.000 1.000 1.000 cjmean 2.934 2.936 2.932 libcent 0 178.6 179.4 179.9 libamp 0 93.9 86.0 100.1 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 180.0 180.2 179.7 kozaiamp 180.0 180.0 180.0