Orbit Fit and Astrometric record for 16PK220

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: 16PK220   
# Created Tue Nov 30 02:13:55 2021
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   3.95y
# First observation: 2014/12/20
#  Last observation: 2018/11/30
Preliminary a, adot, b, bdot, g, gdot:
   0.000153   0.018810   0.000134   0.013960   0.023590   0.000000
# Chi-squared of fit:     7.86 DOF:     14 RMS:  0.16
# Min/Max residuals:    -0.27    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.291701E-05  1.901967E-02  9.460377E-06  1.409437E-02  2.350793E-02  4.409217E-03
# Covariance matrix:
  1.2996E-12 -7.6058E-13  2.5865E-13 -3.4556E-13 -4.3229E-13 -5.5870E-12
 -7.6058E-13  8.9424E-13 -4.4692E-13  5.5577E-13  1.8541E-13  9.1185E-12
  2.5865E-13 -4.4692E-13  9.6792E-13 -5.5203E-13 -5.8280E-14 -5.1892E-12
 -3.4556E-13  5.5577E-13 -5.5203E-13  4.8961E-13  1.0302E-13  6.4113E-12
 -4.3229E-13  1.8541E-13 -5.8280E-14  1.0302E-13  4.3924E-13  1.5847E-12
 -5.5870E-12  9.1185E-12 -5.1892E-12  6.4113E-12  1.5847E-12  1.0533E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -22.400688   24.026991   -0.881786   -0.165463   -0.401964  2457011.650128
# Heliocentric elements and errors
Epoch:              2457010.5000  =  2014/12/19
Mean Anomaly:           43.83364 +/-     0.023
Argument of Peri:      258.44980 +/-     0.035
Long of Asc Node:       51.80011 +/-     0.001
Inclination:            42.41188 +/-     0.001
Eccentricity:         0.24123949 +/-    0.0005
Semi-Major Axis:     49.80834624 +/-    0.0158
Time of Perihelion: 2441376.9834 +/-       3.4
Perihelion:          37.79260637 +/-    0.0263
Aphelion:            61.82408612 +/-    0.0306
Period (y)              351.5292 +/-      0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           35.95633188 +/-    0.0010
Ecliptic Y           16.99729220 +/-    0.0005
Ecliptic Z          -16.21046044 +/-    0.0005
Ecliptic XDOT         0.00009900 +/-    0.0000
Ecliptic YDOT         0.00246604 +/-    0.0000
Ecliptic ZDOT         0.00132204 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.94816378 +/-    0.0009
Geocenter to KBO     42.53884170 +/-    0.0012
# Hcoef:  7.26

The following table shows the complete astrometric record for 16PK220. 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 (16PK220) followed by the observatory code and reference code for the source of the astrometry.

2014 12  20.14935  02 01 54.627  -11 31 50.97  23.7r 16PK220   W84  C~55ZE      
2016 08  15.42631  02 15 34.225  -08 46 04.93  23.5i 16PK220   W84  C~55ZE      
2016 09  08.34864  02 14 44.794  -08 57 16.29  23.2r 16PK220   W84  C~55ZE      
2016 10  27.19992  02 11 18.348  -09 17 01.23  23.1i 16PK220   W84  C~55ZE      
2016 10  27.20130  02 11 18.337  -09 17 00.92  23.8r 16PK220   W84  C~55ZE      
2016 12  31.08714  02 07 11.380  -09 09 48.09  23.4r 16PK220   W84  C~55ZE      
2017 12  14.06763  02 10 40.482  -08 08 30.75  24.3g 16PK220   W84  C~55ZE      
2018 11  16.11363  02 15 17.099  -07 03 21.36  23.7i 16PK220   W84  C~55ZE      
2018 11  30.10951  02 14 16.402  -07 03 19.17  23.5r 16PK220   W84  C~55ZE      
2018 11  30.11088  02 14 16.393  -07 03 19.19  24.3g 16PK220   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    -0.03       0.00     0.00
     2   1.6544  14980.33     0.25    4677.13    -0.16
     3   1.7199  14042.35    -0.27    4333.08    -0.25
     4   1.8537  10751.20    -0.05    4392.89    -0.00
     5   1.8537  10751.17     0.02    4393.24     0.33
     6   2.0313   7519.59     0.20    6170.77     0.18
     7   2.9840  11788.99    -0.20    8422.33    -0.16
     8   3.9068  17110.00     0.10   10503.77     0.10
     9   3.9451  16268.89     0.02   10848.73    -0.02
    10   3.9451  16268.76    -0.04   10848.76    -0.03

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.

16PK220    quality flag:2

Type:       SCATEXTD  SCATEXTD  SCATNEAR

axisobj        50.323    50.371    50.274
ecceobj         0.248     0.249     0.246
incobj         42.340    42.341    42.340
qmin           37.255    36.703    37.291
qmax           63.311    63.954    63.236
amean          50.007    50.043    49.956
amin           49.564    49.587    49.506
amax           50.532    50.573    50.508
emean           0.234     0.248     0.234
emin            0.216     0.230     0.219
emax            0.253     0.266     0.252
imean          41.659    41.447    41.639
imin           41.329    41.065    41.335
imax           42.063    41.801    41.976
excite_mean     0.705     0.707     0.704
fracstop        1.000     1.000     1.000
cjmean          2.475     2.475     2.475

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       173.2     172.1     171.2
kozaiamp        180.0     180.0     179.9