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: 16PM220
# Created Wed Dec 25 02:10:39 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 17 observations of 17
# Arc: 6.21y
# First observation: 2016/08/14
# Last observation: 2022/10/29
# Chi-squared of fit: 3.49 DOF: 28 RMS: 0.08
# Min/Max residuals: -0.23 0.19
# Exact a, adot, b, bdot, g, gdot:
1.619698E-05 3.130817E-02 6.810106E-06 1.333885E-02 2.981761E-02 3.344262E-03
# Covariance matrix:
8.3655E-13 1.5069E-13 -3.3319E-14 6.0717E-14 8.9312E-13 7.0631E-13
1.5069E-13 4.9528E-13 -1.2491E-13 2.2842E-13 5.7279E-13 2.7314E-12
-3.3319E-14 -1.2491E-13 2.0714E-13 -9.5562E-14 -1.3168E-13 -7.1853E-13
6.0717E-14 2.2842E-13 -9.5562E-14 1.2425E-13 2.4054E-13 1.3140E-12
8.9312E-13 5.7279E-13 -1.3168E-13 2.4054E-13 1.4460E-12 2.8539E-12
7.0631E-13 2.7314E-12 -7.1853E-13 1.3140E-12 2.8539E-12 1.5724E-11
# lat0 lon0 xBary yBary zBary JD0
1.875980 -2.976270 0.582946 0.027321 -0.829206 2457614.765939
# Heliocentric elements and errors
Epoch: 2457614.5000 = 2016/08/14
Mean Anomaly: 25.53208 +/- 0.031
Argument of Peri: 329.35643 +/- 0.046
Long of Asc Node: 351.76816 +/- 0.000
Inclination: 23.19360 +/- 0.000
Eccentricity: 0.16256723 +/- 0.0001
Semi-Major Axis: 39.98466148 +/- 0.0063
Time of Perihelion: 2451064.7872 +/- 8.1
Perihelion: 33.48446568 +/- 0.0067
Aphelion: 46.48485728 +/- 0.0084
Period (y) 252.8415 +/- 0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X 34.26866062 +/- 0.0013
Ecliptic Y -2.36807576 +/- 0.0001
Ecliptic Z 1.09810948 +/- 0.0001
Ecliptic XDOT 0.00041713 +/- 0.0000
Ecliptic YDOT 0.00285000 +/- 0.0000
Ecliptic ZDOT 0.00123414 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 34.36788172 +/- 0.0013
Geocenter to KBO 33.53719920 +/- 0.0014
# Hcoef: 7.74
The following table shows the complete astrometric record for 16PM220. 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 (16PM220) followed by the observatory code and reference code for the source of the astrometry.
2016 08 14.26515 23 46 05.674 +00 32 17.35 22.7z 16PM220 W84 C~55ZE 2016 09 30.10519 23 41 58.271 +00 12 31.95 22.9r 16PM220 W84 C~55ZE 2016 09 30.10656 23 41 58.262 +00 12 31.98 22.5i 16PM220 W84 C~55ZE 2016 09 30.10792 23 41 58.263 +00 12 32.05 23.6g 16PM220 W84 C~55ZE 2016 10 06.05039 23 41 26.421 +00 09 48.40 22.7z 16PM220 W84 C~55ZE 2017 09 27.14973 23 47 38.498 +01 38 57.98 22.6z 16PM220 W84 C~55ZE 2017 09 27.15112 23 47 38.489 +01 38 57.85 23.1i 16PM220 W84 C~55ZE 2017 10 26.05569 23 45 13.155 +01 26 11.02 23.1z 16PM220 W84 C~55ZE 2017 11 15.06718 23 44 03.651 +01 20 00.84 23.5g 16PM220 W84 C~55ZE 2017 11 15.06854 23 44 03.647 +01 20 00.87 23.0i 16PM220 W84 C~55ZE 2017 11 17.02077 23 43 58.778 +01 19 35.78 23.2r 16PM220 W84 C~55ZE 2021 11 05.085470 00 05 47.491 +06 54 34.58 23.3G 16PM220 G37 C~5BcT 2021 11 05.135220 00 05 47.297 +06 54 33.18 16PM220 G37 C~5BcT 2021 11 05.183830 00 05 47.091 +06 54 32.13 16PM220 G37 C~5BcT 2022 10 29.127200 00 11 36.462 +08 19 19.00 23.1G 16PM220 G37 C~5z9S 2022 10 29.165390 00 11 36.303 +08 19 18.17 16PM220 G37 C~5z9S 2022 10 29.203880 00 11 36.124 +08 19 16.82 16PM220 G37 C~5z9S
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 0.08
2 0.1282 0.00 -0.04 0.00 -0.11
3 0.1282 0.00 -0.06 0.00 -0.04
4 0.1282 0.00 0.07 0.00 0.07
5 0.1445 0.00 0.03 0.00 0.06
6 1.1195 0.00 -0.04 0.00 0.03
7 1.1195 0.00 -0.06 0.00 -0.06
8 1.1986 0.00 -0.00 0.00 0.11
9 1.2534 0.00 0.05 0.00 -0.07
10 1.2534 0.00 0.04 0.00 -0.02
11 1.2587 0.00 -0.02 0.00 0.00
12 5.2261 0.00 0.04 0.00 0.02
13 5.2262 0.00 0.13 0.00 -0.14
14 5.2263 0.00 -0.02 0.00 0.03
15 6.2063 0.00 -0.23 0.00 -0.05
16 6.2064 0.00 0.03 0.00 0.19
17 6.2065 0.00 0.02 0.00 -0.07
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.
16PM220 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 40.318 40.318 40.318 ecceobj 0.169 0.169 0.169 incobj 23.102 23.102 23.102 qmin 32.132 32.370 32.490 qmax 48.779 48.330 48.251 amean 40.204 40.055 40.056 amin 39.567 39.514 39.446 amax 40.775 40.662 40.629 emean 0.168 0.160 0.162 emin 0.147 0.129 0.136 emax 0.201 0.193 0.190 imean 23.381 23.509 23.528 imin 22.305 22.374 22.569 imax 24.119 24.403 24.382 excite_mean 0.431 0.430 0.431 fracstop 1.000 1.000 1.000 cjmean 2.839 2.839 2.838 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 172.0 176.0 172.0 kozaiamp 180.0 180.0 180.0