Orbit Fit and Astrometric record for 16PM220

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 Thu Dec  9 02:13:49 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     14 observations of     14
# Arc:   5.23y
# First observation: 2016/08/14
#  Last observation: 2021/11/05
# Chi-squared of fit:     1.69 DOF:     22 RMS:  0.06
# Min/Max residuals:    -0.12    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.622193E-05  3.130812E-02  6.884078E-06  1.333874E-02  2.981761E-02  3.343571E-03
# Covariance matrix:
  8.3928E-13  1.6610E-13 -3.1918E-14  6.1967E-14  9.0754E-13  8.0305E-13
  1.6610E-13  7.9467E-13 -1.8796E-13  3.7143E-13  7.9637E-13  5.0410E-12
 -3.1918E-14 -1.8796E-13  2.3158E-13 -1.4037E-13 -1.7176E-13 -1.2581E-12
  6.1967E-14  3.7143E-13 -1.4037E-13  2.1189E-13  3.3814E-13  2.4873E-12
  9.0754E-13  7.9637E-13 -1.7176E-13  3.3814E-13  1.6173E-12  4.5454E-12
  8.0305E-13  5.0410E-12 -1.2581E-12  2.4873E-12  4.5454E-12  3.3795E-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:           25.52919 +/-     0.041
Argument of Peri:      329.36172 +/-     0.061
Long of Asc Node:      351.76813 +/-     0.000
Inclination:            23.19347 +/-     0.000
Eccentricity:         0.16254808 +/-    0.0001
Semi-Major Axis:     39.98415302 +/-    0.0063
Time of Perihelion: 2451065.6540 +/-      10.5
Perihelion:          33.48480592 +/-    0.0075
Aphelion:            46.48350013 +/-    0.0090
Period (y)              252.8367 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           34.26865670 +/-    0.0014
Ecliptic Y           -2.36807472 +/-    0.0001
Ecliptic Z            1.09811183 +/-    0.0001
Ecliptic XDOT         0.00041707 +/-    0.0000
Ecliptic YDOT         0.00285000 +/-    0.0000
Ecliptic ZDOT         0.00123413 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.36787783 +/-    0.0014
Geocenter to KBO     33.53719533 +/-    0.0014
# Hcoef:  7.73

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      

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     0.07
     2   0.1282      0.00    -0.03       0.00    -0.12
     3   0.1282      0.00    -0.06       0.00    -0.05
     4   0.1282      0.00     0.07       0.00     0.05
     5   0.1445      0.00     0.03       0.00     0.04
     6   1.1195      0.00    -0.04       0.00     0.04
     7   1.1195      0.00    -0.06       0.00    -0.05
     8   1.1986      0.00     0.00       0.00     0.12
     9   1.2534      0.00     0.05       0.00    -0.06
    10   1.2534      0.00     0.05       0.00    -0.01
    11   1.2587      0.00    -0.02       0.00     0.01
    12   5.2261      0.00    -0.01       0.00     0.04
    13   5.2262      0.00     0.07       0.00    -0.11
    14   5.2263      0.00    -0.08       0.00     0.05

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           31.245    32.110    32.738
qmax           49.825    48.607    48.026
amean          40.210    40.140    40.214
amin           39.511    39.485    39.767
amax           40.895    40.717    40.616
emean           0.174     0.171     0.157
emin            0.142     0.148     0.134
emax            0.221     0.197     0.184
imean          23.340    23.425    23.688
imin           21.783    22.366    22.592
imax           24.187    24.441    24.438
excite_mean     0.433     0.433     0.431
fracstop        1.000     1.000     1.000
cjmean          2.838     2.837     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       175.0     175.1     169.5
kozaiamp        180.0     180.0     180.0