Orbit Fit and Astrometric record for 16PO220

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: 16PO220   
# Created Sat Dec  4 02:13:52 2021
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:   2.09y
# First observation: 2016/08/15
#  Last observation: 2018/09/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000039   0.021337  -0.000020   0.011567   0.024613   0.000000
# Chi-squared of fit:     4.23 DOF:     26 RMS:  0.09
# Min/Max residuals:    -0.17    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.442458E-05  2.123779E-02  7.731866E-06  1.153226E-02  2.460972E-02 -3.763944E-04
# Covariance matrix:
  9.6233E-13  3.1054E-13 -6.5739E-14  3.6445E-13  1.1514E-12  1.5413E-11
  3.1054E-13  6.9376E-13 -8.5012E-14  4.7229E-13  7.7974E-13  1.9978E-11
 -6.5739E-14 -8.5012E-14  1.9325E-13 -1.8848E-13 -1.2093E-13 -3.1186E-12
  3.6445E-13  4.7229E-13 -1.8848E-13  5.5870E-13  6.7091E-13  1.7326E-11
  1.1514E-12  7.7974E-13 -1.2093E-13  6.7091E-13  1.7699E-12  2.8376E-11
  1.5413E-11  1.9978E-11 -3.1186E-12  1.7326E-11  2.8376E-11  7.3290E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.507896   -4.542183    0.545893    0.022643   -0.854057  2457615.756729
# Heliocentric elements and errors
Epoch:              2457610.5000  =  2016/08/10
Mean Anomaly:          290.38747 +/-     0.560
Argument of Peri:       75.74828 +/-     0.674
Long of Asc Node:      351.99246 +/-     0.000
Inclination:            28.63223 +/-     0.001
Eccentricity:         0.02825417 +/-    0.0011
Semi-Major Axis:     41.87134667 +/-    0.0078
Time of Perihelion: 2476746.8330 +/-     153.8
Perihelion:          40.68830658 +/-    0.0462
Aphelion:            43.05438676 +/-    0.0463
Period (y)              270.9465 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.29752177 +/-    0.0022
Ecliptic Y           -3.83108599 +/-    0.0002
Ecliptic Z            1.06959620 +/-    0.0001
Ecliptic XDOT         0.00011316 +/-    0.0000
Ecliptic YDOT         0.00235431 +/-    0.0000
Ecliptic ZDOT         0.00128140 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.48863170 +/-    0.0022
Geocenter to KBO     40.63435737 +/-    0.0022
# Hcoef:  6.98

The following table shows the complete astrometric record for 16PO220. 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 (16PO220) followed by the observatory code and reference code for the source of the astrometry.

2016 08  15.25594  23 40 55.937  -00 25 15.44  22.6z 16PO220   W84  C~55ZE      
2016 09  30.09716  23 37 26.935  -00 42 04.01  23.1r 16PO220   W84  C~55ZE      
2016 09  30.09852  23 37 26.929  -00 42 03.82  23.1i 16PO220   W84  C~55ZE      
2016 09  30.09989  23 37 26.930  -00 42 04.04  23.9g 16PO220   W84  C~55ZE      
2016 10  05.08483  23 37 04.145  -00 43 59.42  22.7z 16PO220   W84  C~55ZE      
2016 10  05.14856  23 37 03.856  -00 44 00.97  23.2i 16PO220   W84  C~55ZE      
2016 10  05.14994  23 37 03.845  -00 44 00.93  23.0r 16PO220   W84  C~55ZE      
2016 10  05.15132  23 37 03.829  -00 44 01.04  24.0g 16PO220   W84  C~55ZF      
2016 11  05.05332  23 35 06.687  -00 53 45.50  22.8z 16PO220   W84  C~55ZF      
2017 09  27.14836  23 41 07.144  +00 24 42.67  22.5z 16PO220   W84  C~55ZF      
2017 11  15.06304  23 38 05.241  +00 09 11.05  23.7g 16PO220   W84  C~55ZF      
2017 11  15.06581  23 38 05.242  +00 09 10.96  22.9i 16PO220   W84  C~55ZF      
2017 11  25.04539  23 37 47.621  +00 07 52.89  22.6z 16PO220   W84  C~55ZF      
2018 09  17.27023  23 45 21.296  +01 34 24.08  23.2i 16PO220   W84  C~55ZF      
2018 09  17.27161  23 45 21.287  +01 34 24.11  22.7r 16PO220   W84  C~55ZF      
2018 09  17.27297  23 45 21.285  +01 34 24.20  23.7g 16PO220   W84  C~55ZF      

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    -0.16       0.00    -0.07
     2   0.1255  -3278.11    -0.03     317.02    -0.07
     3   0.1255  -3278.12     0.06     317.23     0.13
     4   0.1255  -3278.19     0.09     317.02    -0.08
     5   0.1392  -3637.78     0.09     346.57     0.05
     6   0.1393  -3642.38     0.09     346.86    -0.05
     7   0.1393  -3642.51     0.05     346.96     0.04
     8   0.1393  -3642.78    -0.11     346.96     0.03
     9   0.2239  -5488.41    -0.09     506.77    -0.05
    10   1.1167   1343.29     0.12    2685.85    -0.14
    11   1.2507  -1531.27    -0.01    2912.59     0.12
    12   1.2507  -1531.30     0.06    2912.50     0.02
    13   1.2780  -1804.95    -0.17    2945.66     0.19
    14   2.0890   6503.88    -0.03    5015.63    -0.12
    15   2.0890   6503.77    -0.04    5015.71    -0.04
    16   2.0890   6503.78     0.07    5015.80     0.04

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.

16PO220    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        42.203    42.222    42.184
ecceobj         0.033     0.034     0.032
incobj         28.500    28.500    28.501
qmin           40.221    40.176    40.262
qmax           44.130    44.161    44.035
amean          42.069    42.088    42.050
amin           41.742    41.757    41.733
amax           42.393    42.433    42.378
emean           0.029     0.030     0.028
emin            0.018     0.019     0.017
emax            0.041     0.041     0.039
imean          29.134    29.135    29.134
imin           28.819    28.833    28.835
imax           29.415    29.417    29.411
excite_mean     0.488     0.488     0.488
fracstop        1.000     1.000     1.000
cjmean          2.779     2.779     2.779

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       183.2     182.9     183.9
kozaiamp        180.0     179.9     180.0