Orbit Fit and Astrometric record for 16SS46

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: 16SS46    
# Created Thu Jul 19 01:38:25 2018
# Orbit generated from Bernstein formalism
# Fitting   15 observations of   15
# Arc:   1.24y
# First observation: 2016/09/22
#  Last observation: 2017/12/20
Preliminary a, adot, b, bdot, g, gdot:
   0.000011   0.041313   0.000003  -0.002215   0.033151   0.000000
# Chi-squared of fit:    23.89 DOF:   24 RMS:  0.22
# Min/Max residuals:    -0.38    0.47
# Exact a, adot, b, bdot, g, gdot:
  2.001181E-05  4.100448E-02 -1.002944E-06 -2.193186E-03  3.289604E-02 -6.950165E-03
# Covariance matrix:
  3.7809E-13  9.8417E-12  1.3647E-13 -1.9802E-12  4.6732E-12  9.3858E-10
  9.8417E-12  6.3674E-10  7.9488E-12 -1.3722E-10  2.6540E-10  6.6259E-08
  1.3647E-13  7.9488E-12  2.1899E-13 -1.8044E-12  3.3769E-12  8.1649E-10
 -1.9802E-12 -1.3722E-10 -1.8044E-12  3.0428E-11 -5.6413E-11 -1.4447E-08
  4.6732E-12  2.6540E-10  3.3769E-12 -5.6413E-11  1.1334E-10  2.7153E-08
  9.3858E-10  6.6259E-08  8.1649E-10 -1.4447E-08  2.7153E-08  6.9930E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
  -15.033702   40.383071    0.657197   -0.197800   -0.737197  2457653.784585
# Heliocentric elements and errors
Epoch:              2457650.5000  =  2016/09/19
Mean Anomaly:          335.37944 +/-     4.063
Argument of Peri:      304.83821 +/-    10.154
Long of Asc Node:      142.14113 +/-     0.094
Inclination:            15.03741 +/-     0.005
Eccentricity:         0.31775408 +/-    0.0552
Semi-Major Axis:     42.08336066 +/-    1.5252
Time of Perihelion: 2464470.1091 +/-    1062.5
Perihelion:          28.71120108 +/-    2.5452
Aphelion:            55.45552023 +/-    3.0716
Period (y)              273.0070 +/-     14.84
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           23.36631836 +/-    0.0072
Ecliptic Y           19.01223931 +/-    0.0061
Ecliptic Z           -7.88511512 +/-    0.0026
Ecliptic XDOT        -0.00267087 +/-    0.0002
Ecliptic YDOT         0.00220004 +/-    0.0001
Ecliptic ZDOT        -0.00002628 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   31.13880405 +/-    0.0066
Geocenter to KBO     30.39879186 +/-    0.0098
# Hcoef:  9.08

The following table shows the complete astrometric record for 16SS46. 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 (16SS46) followed by the observatory code and reference code for the source of the astrometry.

2016 09  22.283796 02 50 32.02   +00 37 31.2   23.5i 16SS46    W84  C~2B0K      
2016 09  22.289097 02 50 32.01   +00 37 30.9   23.2z 16SS46    W84  C~2B0K      
2016 09  27.44396  02 50 11.35   +00 34 05.7   24.1g 16SS46    568  C~2NQ0      
2016 09  27.51628  02 50 11.04   +00 34 02.8   24.0g 16SS46    568  C~2NQ0      
2016 09  28.45298  02 50 07.03   +00 33 25.6   24.3g 16SS46    568  C~2NQ0      
2016 09  28.57265  02 50 06.50   +00 33 20.9   24.5g 16SS46    568  C~2NQ0      
2016 09  29.206921 02 50 03.73   +00 32 56.2   23.4r 16SS46    W84  C~2B0K      
2016 10  05.178484 02 49 36.07   +00 29 00.9   23.3r 16SS46    W84  C~2B0K      
2016 10  05.180845 02 49 36.06   +00 29 00.6   23.5i 16SS46    W84  C~2B0K      
2016 10  10.173299 02 49 10.97   +00 25 47.1   23.4r 16SS46    W84  C~2B0K      
2016 10  10.175648 02 49 10.96   +00 25 47.2   23.6i 16SS46    W84  C~2B0K      
2016 10  10.179618 02 49 10.94   +00 25 46.9   23.4z 16SS46    W84  C~2B0K      
2016 10  27.115301 02 47 35.94   +00 15 39.1   23.6r 16SS46    W84  C~2B0K      
2017 12  20.27929  02 51 48.673  +00 36 44.96  23.3R 16SS46    G37              
2017 12  20.35598  02 51 48.359  +00 36 45.44        16SS46    G37              

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    -0.01
  2   0.0000     -0.23     0.06      -0.24    -0.14
  3   0.0141   -357.73     0.12    -101.89    -0.33
  4   0.0143   -363.04     0.18    -103.25    -0.38
  5   0.0169   -431.63     0.17    -120.47    -0.35
  6   0.0172   -440.63     0.21    -122.54    -0.31
  7   0.0190   -487.71     0.06    -133.49    -0.01
  8   0.0353   -954.40    -0.19    -232.00     0.47
  9   0.0353   -954.63    -0.23    -232.24     0.27
 10   0.0490  -1371.93    -0.24    -302.59     0.24
 11   0.0490  -1372.04    -0.14    -302.44     0.41
 12   0.0490  -1372.42    -0.18    -302.64     0.27
 13   0.0954  -2914.76     0.21    -449.98    -0.11
 14   1.2430   1081.69    -0.04    -392.42    -0.10
 15   1.2432   1077.34     0.04    -390.54     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.

16SS46    quality flag:2

Type:          5:3EE  CENTAURR  CENTAURR

axisobj        42.677    46.619    42.355
ecceobj         0.324     0.454     0.295
incobj         15.019    14.996    15.028
qmin           28.335    24.414    28.986
qmax           56.941    68.997    64.554
amean          42.325    46.213    44.380
amin           41.908    45.272    40.651
amax           42.841    47.244    47.767
emean           0.315     0.457     0.322
emin            0.304     0.432     0.246
emax            0.329     0.470     0.371
imean          14.030    12.751    12.312
imin           13.557    11.836     9.176
imax           14.518    14.610    15.379
excite_mean     0.397     0.507     0.388
fracstop        1.000     0.059     0.179
cjmean          2.895     2.805     2.925

libcent 0       180.1    -180.0    -180.0
libamp  0        28.4    -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       176.4     153.7     162.2
kozaiamp        180.0     180.0     179.8