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: 17QV218 # Created Mon Jul 7 01:11:33 2025 # Orbit generated from Bernstein formalism # Fitting 18 observations of 18 # Arc: 1.06y # First observation: 2016/07/29 # Last observation: 2017/08/19 Preliminary a, adot, b, bdot, g, gdot: -0.000084 0.015483 0.000004 0.005243 0.019418 0.000000 # Chi-squared of fit: 5.09 DOF: 30 RMS: 0.09 # Min/Max residuals: -0.18 0.17 # Exact a, adot, b, bdot, g, gdot: 1.294187E-05 1.552984E-02 4.286845E-06 5.273328E-03 1.968703E-02 3.913066E-03 # Covariance matrix: 4.6357E-13 6.6888E-13 -4.4154E-14 4.4583E-13 1.1417E-12 7.7297E-11 6.6888E-13 4.7704E-12 -1.9681E-13 2.0401E-12 4.4537E-12 3.6007E-10 -4.4154E-14 -1.9681E-13 2.3661E-13 -3.2988E-13 -2.1580E-13 -1.6371E-11 4.4583E-13 2.0401E-12 -3.2988E-13 1.3464E-12 2.1833E-12 1.6899E-10 1.1417E-12 4.4537E-12 -2.1580E-13 2.1833E-12 5.5279E-12 3.7905E-10 7.7297E-11 3.6007E-10 -1.6371E-11 1.6899E-10 3.7905E-10 2.9742E-08 # lat0 lon0 xBary yBary zBary JD0 14.284116 -22.428111 0.520695 0.215132 -0.844554 2457598.886169 # Heliocentric elements and errors Epoch: 2457590.5000 = 2016/07/21 Mean Anomaly: 88.46291 +/- 1.560 Argument of Peri: 283.72363 +/- 1.007 Long of Asc Node: 301.69759 +/- 0.004 Inclination: 23.42251 +/- 0.002 Eccentricity: 0.22767432 +/- 0.0086 Semi-Major Axis: 49.43870769 +/- 0.2087 Time of Perihelion: 2426390.2673 +/- 513.3 Perihelion: 38.18278363 +/- 0.4568 Aphelion: 60.69463175 +/- 0.4983 Period (y) 347.6233 +/- 2.20 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 46.10455666 +/- 0.0054 Ecliptic Y -19.59638293 +/- 0.0023 Ecliptic Z 12.53290422 +/- 0.0015 Ecliptic XDOT 0.00114545 +/- 0.0000 Ecliptic YDOT 0.00185718 +/- 0.0000 Ecliptic ZDOT 0.00084493 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 51.64031426 +/- 0.0049 Geocenter to KBO 50.79486237 +/- 0.0061 # Hcoef: 7.46
The following table shows the complete astrometric record for 17QV218. 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 (17QV218) followed by the observatory code and reference code for the source of the astrometry.
2016 07 29.38538 22 15 54.28 +04 32 54.2 24.1z 17QV218 T09 C~8vJE 2016 07 29.38807 22 15 54.28 +04 32 54.2 24.0z 17QV218 T09 C~8vJE 2016 07 29.39883 22 15 54.24 +04 32 54.2 24.8z 17QV218 T09 C~8vJE 2016 08 28.28693 22 14 02.88 +04 25 59.6 24.2i 17QV218 T09 C~8vJE 2016 08 28.29503 22 14 02.84 +04 25 59.6 24.0i 17QV218 T09 C~8vJE 2016 08 28.30317 22 14 02.81 +04 25 59.5 23.6i 17QV218 T09 C~8vJE 2016 08 28.31125 22 14 02.77 +04 25 59.3 24.1i 17QV218 T09 C~8vJE 2017 06 20.48748 22 20 22.89 +05 07 45.1 24.4z 17QV218 T09 C~8vJE 2017 06 20.49352 22 20 22.89 +05 07 45.1 24.9z 17QV218 T09 C~8vJE 2017 06 20.50436 22 20 22.87 +05 07 45.1 24.1z 17QV218 T09 C~8vJE 2017 06 20.51510 22 20 22.85 +05 07 45.1 24.5z 17QV218 T09 C~8vJE 2017 06 20.52581 22 20 22.85 +05 07 45.5 24.7z 17QV218 T09 C~8vJE 2017 08 18.32984 22 17 34.09 +05 05 23.8 25.4g 17QV218 T09 C~8vJE 2017 08 18.36270 22 17 33.99 +05 05 23.1 24.5g 17QV218 T09 C~8vJE 2017 08 19.34926 22 17 30.21 +05 05 07.6 24.9r 17QV218 T09 C~8vJE 2017 08 19.36129 22 17 30.18 +05 05 07.5 24.8r 17QV218 T09 C~8vJE 2017 08 19.37390 22 17 30.12 +05 05 07.3 25.3r 17QV218 T09 C~8vJE 2017 08 19.38230 22 17 30.09 +05 05 07.1 24.5r 17QV218 T09 C~8vJE
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 -0.01
2 0.0000 0.00 0.04 0.00 -0.04
3 0.0000 -0.56 0.03 0.22 0.05
4 0.0819 -1701.30 0.06 229.64 -0.17
5 0.0819 -1701.85 0.00 229.86 0.02
6 0.0819 -1702.31 0.05 229.93 0.06
7 0.0819 -1702.94 -0.09 229.97 0.07
8 0.8928 4503.26 -0.02 466.33 0.17
9 0.8928 4503.26 0.07 466.33 0.06
10 0.8929 4502.98 -0.04 466.44 -0.04
11 0.8929 4502.71 -0.15 466.55 -0.13
12 0.8929 4502.85 0.16 466.92 0.04
13 1.0539 2105.49 -0.18 1262.55 0.14
14 1.0540 2103.84 0.12 1262.45 -0.18
15 1.0567 2045.62 -0.12 1268.84 -0.02
16 1.0567 2045.17 0.15 1268.91 -0.02
17 1.0568 2044.26 -0.01 1269.05 0.04
18 1.0568 2043.77 0.01 1269.03 -0.04
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.
17QV218 quality flag:2 Type: SCATEXTD SCATNEAR SCATEXTD axisobj 49.688 50.316 49.144 ecceobj 0.222 0.246 0.199 incobj 23.409 23.412 23.405 qmin 37.739 36.980 38.543 qmax 62.022 64.158 60.126 amean 49.639 50.275 49.089 amin 49.196 49.823 48.659 amax 50.154 50.829 49.585 emean 0.221 0.245 0.198 emin 0.205 0.228 0.183 emax 0.237 0.262 0.213 imean 25.013 25.016 25.011 imin 24.572 24.496 24.616 imax 25.443 25.519 25.369 excite_mean 0.477 0.489 0.467 fracstop 1.000 1.000 1.000 cjmean 2.876 2.869 2.882 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 183.7 182.7 186.1 kozaiamp 180.0 180.0 180.0