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: 16SW50 # Created Sun Apr 27 01:10:53 2025 # Orbit generated from Bernstein formalism # Fitting 25 observations of 26 # Arc: 1.16y # First observation: 2016/09/22 # Last observation: 2017/11/19 Preliminary a, adot, b, bdot, g, gdot: -0.000014 0.032392 -0.000014 0.017041 0.028352 0.000000 # Chi-squared of fit: 38.70 DOF: 44 RMS: 0.22 # Min/Max residuals: -0.52 0.46 # Exact a, adot, b, bdot, g, gdot: 1.789956E-05 3.233719E-02 1.018060E-05 1.697788E-02 2.842229E-02 -1.426241E-03 # Covariance matrix: 6.3090E-13 1.6035E-12 -2.7596E-14 1.2638E-12 1.6992E-12 6.8840E-11 1.6035E-12 3.2139E-11 -4.1417E-13 1.9170E-11 2.6436E-11 1.0439E-09 -2.7596E-14 -4.1417E-13 4.9754E-13 -7.1773E-13 -3.4182E-13 -1.3748E-11 1.2638E-12 1.9170E-11 -7.1773E-13 1.2144E-11 1.5933E-11 6.3414E-10 1.6992E-12 2.6436E-11 -3.4182E-13 1.5933E-11 2.2331E-11 8.6739E-10 6.8840E-11 1.0439E-09 -1.3748E-11 6.3414E-10 8.6739E-10 3.4535E-08 # lat0 lon0 xBary yBary zBary JD0 -18.527428 31.127479 0.525708 -0.272817 -0.814668 2457653.795841 # Heliocentric elements and errors Epoch: 2457650.5000 = 2016/09/19 Mean Anomaly: 357.60340 +/- 0.243 Argument of Peri: 333.10785 +/- 0.863 Long of Asc Node: 61.06562 +/- 0.004 Inclination: 32.52567 +/- 0.003 Eccentricity: 0.50448635 +/- 0.0012 Semi-Major Axis: 72.38844223 +/- 0.1296 Time of Perihelion: 2459148.1004 +/- 152.0 Perihelion: 35.86946088 +/- 0.1064 Aphelion: 108.90742359 +/- 0.2127 Period (y) 615.9026 +/- 1.65 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X 29.56028588 +/- 0.0048 Ecliptic Y 17.23677607 +/- 0.0029 Ecliptic Z -11.17959851 +/- 0.0019 Ecliptic XDOT -0.00127512 +/- 0.0000 Ecliptic YDOT 0.00286088 +/- 0.0000 Ecliptic ZDOT 0.00159430 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 35.99861627 +/- 0.0042 Geocenter to KBO 35.18365272 +/- 0.0058 # Hcoef: 8.71
The following table shows the complete astrometric record for 16SW50. 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 (16SW50) followed by the observatory code and reference code for the source of the astrometry.
2016 09 22.295052 02 21 28.01 -05 32 29.4 23.8r 16SW50 W84 C~2b80 2016 09 26.242055 02 21 11.16 -05 34 25.0 23.5i 16SW50 W84 C~2b80 2016 10 08.117471 02 20 14.86 -05 39 54.6 23.2i 16SW50 W84 C~2b80 2016 11 22.173235 02 16 14.06 -05 50 47.4 24.1r 16SW50 W84 C~2b80 2017 09 07.242427 02 27 59.02 -03 52 14.1 23.9z 16SW50 W84 C~2b80 2017 09 12.370732 02 27 43.49 -03 54 39.9 24.1i 16SW50 W84 C~2b80 2017 09 14.204861 02 27 37.45 -03 55 31.9 24.6g 16SW50 W84 C~2b80 2017 09 14.217344 02 27 37.40 -03 55 31.9 24.3r 16SW50 W84 C~2b80 2017 09 19.271041 02 27 19.18 -03 57 56.2 24.1i 16SW50 W84 C~2b80 2017 09 23.245036 02 27 03.44 -03 59 50.0 24.4z 16SW50 W84 C~2b80 2017 09 23.298315 02 27 03.25 -03 59 51.1 24.8g 16SW50 W84 C~2b80 2017 09 23.310902 02 27 03.19 -03 59 51.7 24.3r 16SW50 W84 C~2b80 2017 10 13.217533 02 25 29.67 -04 08 41.5 25.1g 16SW50 W84 C~2b80 2017 10 14.168629 02 25 24.72 -04 09 04.3 24.1r 16SW50 W84 C~2b80 2017 10 14.199558 02 25 24.57 -04 09 04.7 24.0i 16SW50 W84 C~2b80 2017 10 17.284208 02 25 08.30 -04 10 15.7 24.8g 16SW50 W84 C~2b80 2017 10 19.118714 02 24 58.47 -04 10 56.4 24.4r 16SW50 W84 C~2b80 2017 10 19.138548 02 24 58.37 -04 10 56.5 24.1i 16SW50 W84 C~2b80 2017 10 21.176395 02 24 47.33 -04 11 39.6 24.8g 16SW50 W84 C~2b80 2017 10 26.238548 02 24 19.65 -04 13 18.8 24.1r 16SW50 W84 C~2b80 2017 10 26.258431 02 24 19.54 -04 13 19.2 24.2i 16SW50 W84 C~2b80 2017 10 31.120468 02 23 52.71 -04 14 42.2 23.9i 16SW50 W84 C~2b80 2017 11 14.097765 02 22 36.23 -04 17 22.9 24.5r 16SW50 W84 C~2b80 2017 11 14.117634 02 22 36.14 -04 17 23.0 24.2i 16SW50 W84 C~2b80 2017 11 19.188985 02 22 09.42 -04 17 49.7 24.4r 16SW50 W84 C~2b80 2017 11 19.222611 02 22 09.24 -04 17 49.8 24.0i 16SW50 W84 C~2b80
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 0.02 0.00 -0.15
2 0.0108 -275.93 0.06 -22.58 0.19
3 0.0433 -1178.42 -0.08 -45.06 -0.05
4 0.1667 -4780.40 ( 1.06) 566.09 ( 0.70)
5 0.9581 7559.01 0.26 3645.37 0.19
6 0.9721 7290.21 -0.49 3588.35 -0.43
7 0.9772 7187.30 0.11 3570.59 -0.29
8 0.9772 7186.59 0.14 3570.85 0.08
9 0.9910 6880.52 0.17 3529.07 0.46
10 1.0019 6619.89 -0.52 3503.16 0.16
11 1.0021 6616.84 0.09 3503.10 0.38
12 1.0021 6615.79 -0.10 3502.85 0.19
13 1.0566 5118.25 -0.01 3485.96 -0.30
14 1.0592 5040.81 -0.12 3489.97 -0.44
15 1.0593 5038.56 0.20 3490.37 -0.20
16 1.0677 4785.40 0.41 3507.24 -0.21
17 1.0728 4633.21 -0.06 3519.48 -0.28
18 1.0728 4631.77 0.17 3519.90 -0.01
19 1.0784 4461.75 -0.19 3536.09 0.29
20 1.0922 4038.54 -0.03 3584.97 0.12
21 1.0923 4036.85 -0.03 3585.16 0.08
22 1.1056 3631.19 0.07 3644.83 -0.13
23 1.1439 2500.97 -0.06 3885.90 0.10
24 1.1439 2499.67 0.21 3886.27 0.04
25 1.1578 2114.91 -0.09 3998.05 0.08
26 1.1579 2112.34 -0.13 3998.88 0.11
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.
16SW50 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 74.126 74.293 74.027 ecceobj 0.516 0.517 0.515 incobj 32.457 32.449 32.463 qmin 33.805 33.919 33.721 qmax 114.134 114.947 113.192 amean 72.978 73.374 72.345 amin 71.984 72.328 71.039 amax 74.411 74.909 74.121 emean 0.514 0.516 0.511 emin 0.496 0.497 0.491 emax 0.536 0.538 0.534 imean 30.983 31.018 30.909 imin 29.990 29.997 29.961 imax 31.911 31.944 31.903 excite_mean 0.728 0.729 0.725 fracstop 1.000 1.000 1.000 cjmean 2.702 2.702 2.702 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 143.7 133.4 147.9 kozaiamp 180.0 180.0 179.9