Orbit Fit and Astrometric record for 16PL220

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: 16PL220   
# Created Sat Nov 27 02:13:57 2021
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     14
# Arc:   3.06y
# First observation: 2015/11/08
#  Last observation: 2018/11/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000418   0.044690   0.000063   0.002151   0.032612   0.000000
# Chi-squared of fit:     5.45 DOF:     22 RMS:  0.11
# Min/Max residuals:    -0.20    0.28
# Exact a, adot, b, bdot, g, gdot:
  2.215405E-05  4.375401E-02  6.343976E-07  2.159519E-03  3.173051E-02 -6.866985E-03
# Covariance matrix:
  1.2909E-12 -1.6445E-12  5.4938E-14 -8.8863E-14 -3.8290E-13 -9.4296E-12
 -1.6445E-12  2.9058E-12 -1.8861E-13  2.0745E-13  2.6308E-13  1.8683E-11
  5.4938E-14 -1.8861E-13  3.8023E-13 -2.0700E-13  4.6570E-14 -1.3808E-12
 -8.8863E-14  2.0745E-13 -2.0700E-13  1.5648E-13 -9.8847E-15  1.4499E-12
 -3.8290E-13  2.6308E-13  4.6570E-14 -9.8847E-15  3.8030E-13  1.1841E-12
 -9.4296E-12  1.8683E-11 -1.3808E-12  1.4499E-12  1.1841E-12  1.2712E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -29.287779   -9.391006   -0.808530   -0.282911   -0.504822  2457334.589769
# Heliocentric elements and errors
Epoch:              2457330.5000  =  2015/11/04
Mean Anomaly:          355.69571 +/-     0.008
Argument of Peri:      296.89324 +/-     0.039
Long of Asc Node:       74.62420 +/-     0.001
Inclination:            28.98993 +/-     0.000
Eccentricity:         0.58849654 +/-    0.0001
Semi-Major Axis:     76.05822068 +/-    0.0172
Time of Perihelion: 2460227.2879 +/-       5.3
Perihelion:          31.29822127 +/-    0.0105
Aphelion:           120.81822010 +/-    0.0284
Period (y)              663.3266 +/-      0.22
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.81783427 +/-    0.0005
Ecliptic Y           -3.78214889 +/-    0.0001
Ecliptic Z          -15.41725770 +/-    0.0003
Ecliptic XDOT         0.00019470 +/-    0.0000
Ecliptic YDOT         0.00378746 +/-    0.0000
Ecliptic ZDOT         0.00045241 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   32.02855583 +/-    0.0005
Geocenter to KBO     31.51540715 +/-    0.0006
# Hcoef:  8.66

The following table shows the complete astrometric record for 16PL220. 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 (16PL220) followed by the observatory code and reference code for the source of the astrometry.

2015 11  08.08898  00 17 01.208  -30 21 37.56  23.7i 16PL220   W84  C~55ZE      
2016 08  14.38661  00 34 56.659  -28 28 49.14  23.9r 16PL220   W84  C~55ZE      
2016 08  14.38798  00 34 56.660  -28 28 49.24  22.7i 16PL220   W84  C~55ZE      
2016 08  14.38935  00 34 56.671  -28 28 49.40  24.0g 16PL220   W84  C~55ZE      
2016 09  07.27208  00 33 02.675  -28 49 23.86  23.0i 16PL220   W84  C~55ZE      
2016 10  28.13524  00 27 53.133  -29 07 15.85  23.7r 16PL220   W84  C~55ZE      
2016 11  05.08795  00 27 12.193  -29 05 31.96  23.9i 16PL220   W84  C~55ZE      
2016 11  06.22283  00 27 06.774  -29 05 10.88  23.6i 16PL220   W84  C~55ZE      
2016 11  06.22419  00 27 06.753  -29 05 10.91  23.6r 16PL220   W84  C~55ZE      
2017 09  24.23453  00 41 17.139  -27 37 41.61  23.8r 16PL220   W84  C~55ZE      
2017 09  24.23591  00 41 17.144  -27 37 41.56  23.2i 16PL220   W84  C~55ZE      
2017 09  26.34959  00 41 03.908  -27 38 49.88  24.1g 16PL220   W84  C~55ZE      
2018 11  29.10036  00 45 11.097  -26 10 26.07  24.1r 16PL220   W84  C~55ZE      
2018 11  29.10174  00 45 11.108  -26 10 25.89  24.6g 16PL220   W84  C~55ZE      

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    -0.07       0.00     0.09
     2   0.7674  15610.22    -0.04    -667.14     0.04
     3   0.7674  15610.19     0.02    -667.23    -0.02
     4   0.7674  15610.24     0.17    -667.44    -0.20
     5   0.8328  13688.84    -0.03   -1015.44    -0.07
     6   0.9721   9598.14     0.08      -1.87    -0.16
     7   0.9938   9174.46    -0.01     344.76     0.28
     8   0.9969   9121.82     0.14     397.05    -0.01
     9   0.9969   9121.56    -0.05     397.15     0.03
    10   1.8786  21552.94    -0.18    -490.64    -0.06
    11   1.8786  21553.02     0.03    -490.63    -0.07
    12   1.8844  21364.51    -0.16    -461.72     0.12
    13   3.0582  26966.23    -0.07    2482.50     0.01
    14   3.0582  26966.45     0.18    2482.58     0.01

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.

16PL220    quality flag:2

Type:       SCATNEAR  CENTAURS  CENTAURS

axisobj        77.745    77.802    77.688
ecceobj         0.598     0.598     0.597
incobj         29.011    29.011    29.011
qmin           30.380    29.476    29.949
qmax          128.940   132.132   129.827
amean          77.582    78.634    77.767
amin           75.655    75.436    74.523
amax           80.976    81.599    80.730
emean           0.586     0.597     0.591
emin            0.567     0.561     0.560
emax            0.607     0.629     0.617
imean          28.510    27.870    28.160
imin           27.158    25.531    26.403
imax           29.954    29.854    29.740
excite_mean     0.756     0.759     0.756
fracstop        1.000     1.000     1.000
cjmean          2.673     2.674     2.674

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       166.7     170.7     168.7
kozaiamp        180.0     180.0     180.0