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: 16YA39 # Created Mon Jul 7 01:11:22 2025 # Orbit generated from Bernstein formalism # Fitting 48 observations of 48 # Arc: 4.15y # First observation: 2016/12/25 # Last observation: 2021/02/19 Preliminary a, adot, b, bdot, g, gdot: -0.000246 0.044514 -0.000025 -0.004043 0.033418 0.000000 # Chi-squared of fit: 33.73 DOF: 90 RMS: 0.15 # Min/Max residuals: -0.47 0.29 # Exact a, adot, b, bdot, g, gdot: 2.059833E-05 4.419287E-02 -2.569521E-06 -4.018363E-03 3.347851E-02 2.202577E-03 # Covariance matrix: 8.7268E-14 -3.9446E-14 5.1640E-15 4.8768E-16 9.0702E-14 -1.5226E-13 -3.9446E-14 2.5040E-13 8.0231E-15 -2.4325E-14 5.9383E-14 1.7075E-12 5.1640E-15 8.0231E-15 4.1872E-14 -2.4250E-14 1.4688E-14 6.6524E-14 4.8768E-16 -2.4325E-14 -2.4250E-14 5.2579E-14 -1.0356E-14 -2.0640E-13 9.0702E-14 5.9383E-14 1.4688E-14 -1.0356E-14 2.1980E-13 4.7708E-13 -1.5226E-13 1.7075E-12 6.6524E-14 -2.0640E-13 4.7708E-13 1.4523E-11 # lat0 lon0 xBary yBary zBary JD0 -10.378840 151.693301 0.837107 -0.094083 -0.514775 2457748.016489 # Heliocentric elements and errors Epoch: 2457740.5000 = 2016/12/18 Mean Anomaly: 1.93061 +/- 0.008 Argument of Peri: 237.54279 +/- 0.018 Long of Asc Node: 268.60127 +/- 0.001 Inclination: 11.56751 +/- 0.000 Eccentricity: 0.36002647 +/- 0.0001 Semi-Major Axis: 47.45989315 +/- 0.0050 Time of Perihelion: 2457100.0574 +/- 2.6 Perihelion: 30.37307534 +/- 0.0044 Aphelion: 64.54671096 +/- 0.0074 Period (y) 326.9628 +/- 0.05 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -25.93528803 +/- 0.0004 Ecliptic Y 14.91300399 +/- 0.0002 Ecliptic Z -5.38135416 +/- 0.0001 Ecliptic XDOT -0.00181507 +/- 0.0000 Ecliptic YDOT -0.00313267 +/- 0.0000 Ecliptic ZDOT -0.00035574 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 30.39729965 +/- 0.0003 Geocenter to KBO 29.86990325 +/- 0.0004 # Hcoef: 9.10
The following table shows the complete astrometric record for 16YA39. 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 (16YA39) followed by the observatory code and reference code for the source of the astrometry.
2016 12 25.51570 10 00 04.64 +01 09 36.4 24.2r 16YA39 T09 C~7dL4 2016 12 25.54359 10 00 04.56 +01 09 36.1 24.0r 16YA39 T09 C~7dL4 2016 12 25.59037 10 00 04.40 +01 09 35.6 23.6i 16YA39 T09 C~7dL4 2017 01 21.41782 09 58 10.28 +01 11 55.3 23.7z 16YA39 T09 C~8Q3u 2017 01 21.43628 09 58 10.19 +01 11 55.9 23.6z 16YA39 T09 C~7dL4 2017 01 21.50822 09 58 09.80 +01 11 56.8 23.5z 16YA39 T09 C~7dL4 2017 01 21.53429 09 58 09.67 +01 11 57.3 23.1z 16YA39 T09 C~7dL4 2017 01 21.57598 09 58 09.43 +01 11 57.4 23.5z 16YA39 T09 C~8Q3u 2017 01 21.60021 09 58 09.28 +01 11 58.1 23.5z 16YA39 T09 C~8Q3u 2017 01 21.61096 09 58 09.24 +01 11 58.5 23.9z 16YA39 T09 C~8Q3u 2017 01 23.36023 09 57 59.85 +01 12 26.3 24.0r 16YA39 T09 C~7dL4 2017 01 23.36572 09 57 59.82 +01 12 26.5 24.0r 16YA39 T09 C~8vIX 2017 01 23.39391 09 57 59.67 +01 12 27.2 24.2r 16YA39 T09 C~7dL4 2017 01 23.40775 09 57 59.58 +01 12 27.2 24.6r 16YA39 T09 C~8vIX 2017 01 23.41253 09 57 59.56 +01 12 27.2 24.3r 16YA39 T09 C~8vIX 2017 01 23.42951 09 57 59.46 +01 12 27.5 24.5r 16YA39 T09 C~8vIX 2017 01 23.45024 09 57 59.35 +01 12 27.8 23.7r 16YA39 T09 C~8vIX 2017 01 23.51704 09 57 58.99 +01 12 29.0 23.5i 16YA39 T09 C~7dL4 2017 01 23.52381 09 57 58.94 +01 12 29.0 23.9i 16YA39 T09 C~8vIX 2017 01 23.52648 09 57 58.93 +01 12 29.4 24.1i 16YA39 T09 C~8vIX 2017 01 23.55808 09 57 58.75 +01 12 29.9 23.6i 16YA39 T09 C~7dL4 2017 01 23.58838 09 57 58.60 +01 12 30.4 23.8i 16YA39 T09 C~7dL4 2017 01 30.43553 09 57 20.05 +01 14 40.3 24.2i 16YA39 T09 C~7dL4 2017 01 30.61243 09 57 19.00 +01 14 44.0 23.7z 16YA39 T09 C~7dL4 2017 02 01.34247 09 57 08.94 +01 15 21.8 24.5g 16YA39 T09 C~7dL4 2017 02 01.35671 09 57 08.87 +01 15 22.3 24.7g 16YA39 T09 C~7dL4 2017 02 01.38893 09 57 08.67 +01 15 22.8 24.4g 16YA39 T09 C~7dL4 2017 02 21.32404 09 55 08.02 +01 24 29.5 23.8z 16YA39 T09 C~7dL4 2017 02 21.34959 09 55 07.85 +01 24 30.7 23.2z 16YA39 T09 C~7dL4 2017 02 21.37516 09 55 07.69 +01 24 31.4 23.4z 16YA39 T09 C~7dL4 2017 02 21.40083 09 55 07.53 +01 24 32.2 23.3z 16YA39 T09 C~7dL4 2017 02 21.42282 09 55 07.38 +01 24 32.7 23.7z 16YA39 T09 C~7dL4 2017 02 23.33356 09 54 55.82 +01 25 33.9 24.5g 16YA39 T09 C~7dL4 2017 02 23.46720 09 54 55.00 +01 25 38.2 23.9r 16YA39 T09 C~7dL4 2017 02 23.49450 09 54 54.83 +01 25 39.2 23.8r 16YA39 T09 C~7dL4 2017 02 23.51193 09 54 54.72 +01 25 39.6 23.8r 16YA39 T09 C~7dL4 2018 01 17.46727 10 07 46.77 +00 04 09.8 23.6i 16YA39 T09 C~7gus 2018 01 17.48332 10 07 46.70 +00 04 09.8 23.5i 16YA39 T09 C~7gus 2018 01 17.51296 10 07 46.53 +00 04 10.1 23.5i 16YA39 T09 C~7gus 2018 01 17.53998 10 07 46.42 +00 04 10.5 23.6i 16YA39 T09 C~7gus 2018 01 17.59100 10 07 46.15 +00 04 11.1 23.4i 16YA39 T09 C~7gus 2018 01 17.59901 10 07 46.12 +00 04 11.3 23.5i 16YA39 T09 C~7gus 2018 05 06.071948 09 59 43.92 +00 56 49.3 16YA39 W84 C~7gus 2018 05 07.041149 09 59 43.76 +00 57 09.3 16YA39 W84 C~7gus 2018 12 13.54558 10 18 41.00 -00 59 24.0 23.3i 16YA39 T09 C~7zpU 2018 12 13.58993 10 18 40.96 -00 59 25.0 24.0i 16YA39 T09 C~7zpU 2018 12 13.64039 10 18 40.89 -00 59 26.0 23.6i 16YA39 T09 C~7zpU 2021 02 19.137630 10 32 19.40 -03 03 27.3 16YA39 W84 C~7gus
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 0.06 0.00 0.14
2 0.0001 -1.02 0.19 -0.70 0.03
3 0.0002 -3.09 0.05 -2.01 -0.29
4 0.0737 -1655.11 -0.26 -470.52 -0.23
5 0.0737 -1656.59 -0.23 -470.43 0.13
6 0.0739 -1662.38 -0.14 -471.63 -0.06
7 0.0740 -1664.38 -0.00 -471.85 0.10
8 0.0741 -1667.79 0.00 -473.02 -0.47
9 0.0742 -1670.14 -0.37 -473.15 -0.26
10 0.0742 -1670.84 -0.19 -472.98 0.06
11 0.0790 -1812.49 0.02 -496.25 -0.07
12 0.0790 -1812.98 -0.02 -496.22 0.03
13 0.0791 -1815.34 -0.02 -496.35 0.28
14 0.0791 -1816.60 -0.13 -496.82 -0.01
15 0.0791 -1816.88 -0.01 -496.93 -0.05
16 0.0792 -1818.39 -0.10 -497.17 -0.06
17 0.0792 -1820.04 -0.01 -497.47 -0.08
18 0.0794 -1825.52 0.12 -498.23 0.06
19 0.0794 -1826.22 -0.01 -498.50 -0.11
20 0.0794 -1826.50 -0.06 -498.17 0.25
21 0.0795 -1829.21 -0.11 -498.65 0.20
22 0.0796 -1831.49 0.15 -498.97 0.29
23 0.0983 -2418.56 0.15 -579.69 -0.00
24 0.0988 -2434.61 0.08 -581.74 -0.09
25 0.1036 -2589.19 0.05 -599.14 -0.04
26 0.1036 -2590.34 0.19 -599.04 0.20
27 0.1037 -2593.33 0.15 -599.62 -0.05
28 0.1583 -4480.09 0.28 -720.68 -0.09
29 0.1583 -4482.90 -0.03 -720.44 0.21
30 0.1584 -4485.39 -0.01 -720.63 0.10
31 0.1585 -4487.92 -0.02 -720.72 0.08
32 0.1585 -4490.20 -0.15 -721.04 -0.18
33 0.1638 -4674.10 0.10 -724.35 -0.05
34 0.1641 -4687.13 0.15 -724.62 -0.06
35 0.1642 -4689.87 0.08 -724.58 0.04
36 0.1643 -4691.55 0.10 -724.78 -0.12
37 1.0622 7871.93 -0.08 -1248.64 0.05
38 1.0622 7870.94 0.12 -1249.00 -0.06
39 1.0623 7868.44 -0.19 -1249.62 -0.21
40 1.0624 7866.76 0.11 -1249.82 0.02
41 1.0625 7862.75 -0.13 -1250.68 -0.03
42 1.0625 7862.25 -0.03 -1250.65 0.12
43 1.3595 -22.37 0.26 -827.35 -0.05
44 1.3622 -31.62 -0.33 -809.46 0.11
45 1.9659 18444.51 0.10 -1382.62 0.21
46 1.9660 18444.29 0.22 -1383.77 0.12
47 1.9661 18443.66 -0.02 -1385.08 0.01
48 4.1523 32765.91 -0.07 -4104.10 -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.
16YA39 quality flag:2 Type: CENTAURS CENTAURS CENTAURR axisobj 47.249 47.267 47.231 ecceobj 0.356 0.356 0.356 incobj 11.548 11.548 11.548 qmin 29.567 29.487 28.789 qmax 76.889 72.391 75.585 amean 50.364 48.042 49.529 amin 46.735 44.437 46.160 amax 54.019 52.159 53.327 emean 0.378 0.350 0.382 emin 0.343 0.298 0.322 emax 0.434 0.406 0.422 imean 14.848 13.380 13.629 imin 12.118 10.077 8.791 imax 16.413 16.371 16.550 excite_mean 0.457 0.420 0.450 fracstop 1.000 1.000 0.450 cjmean 2.911 2.927 2.908 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 198.4 166.0 181.6 kozaiamp 180.0 180.0 179.7