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 Sat Dec 16 02:38:14 2017
# Orbit generated from Bernstein formalism
# Fitting   13 observations of   13
# Arc:  34.83d
# First observation: 2016/09/22
#  Last observation: 2016/10/27
Preliminary a, adot, b, bdot, g, gdot:
   0.000005   0.044461   0.000005  -0.001826   0.033705   0.000000
# Chi-squared of fit:    14.56 DOF:   20 RMS:  0.19
# Min/Max residuals:    -0.30    0.33
# Exact a, adot, b, bdot, g, gdot:
  2.075568E-05  4.020829E-02 -2.560087E-06 -2.259822E-03  3.274911E-02 -1.064219E-02
# Covariance matrix:
  4.5502E-13 -3.5850E-12  4.2498E-14 -5.5195E-13  3.0548E-12  1.2201E-09
 -3.5850E-12  1.3867E-07  1.7318E-10  1.5326E-08  2.7048E-08  1.2288E-06
  4.2498E-14  1.7318E-10  4.9769E-13  1.3662E-11  3.4420E-11  1.8021E-09
 -5.5195E-13  1.5326E-08  1.3662E-11  1.8771E-09  2.9821E-09  1.3106E-07
  3.0548E-12  2.7048E-08  3.4420E-11  2.9821E-09  5.3227E-09  2.5785E-07
  1.2201E-09  1.2288E-06  1.8021E-09  1.3106E-07  2.5785E-07  1.8841E-05
#      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:          331.44373 +/-     4.159
Argument of Peri:      319.16445 +/-    10.773
Long of Asc Node:      142.62279 +/-     0.265
Inclination:            15.06726 +/-     0.017
Eccentricity:         0.38480927 +/-    0.1048
Semi-Major Axis:     43.29977549 +/-    3.6307
Time of Perihelion: 2465905.6660 +/-     606.0
Perihelion:          26.63762032 +/-    5.0566
Aphelion:            59.96193066 +/-    6.7719
Period (y)              284.9290 +/-     35.84
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           23.46662500 +/-    0.0500
Ecliptic Y           19.09758927 +/-    0.0426
Ecliptic Z           -7.92053761 +/-    0.0177
Ecliptic XDOT        -0.00286791 +/-    0.0003
Ecliptic YDOT         0.00196517 +/-    0.0002
Ecliptic ZDOT         0.00004828 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   31.27515501 +/-    0.0459
Geocenter to KBO     30.53517656 +/-    0.0680
# Hcoef:  9.09

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      

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    -0.28       0.00     0.30
  2   0.0000     -0.23    -0.15      -0.24     0.17
  3   0.0141   -357.73     0.12    -101.89    -0.24
  4   0.0143   -363.04     0.18    -103.25    -0.29
  5   0.0169   -431.63     0.19    -120.47    -0.30
  6   0.0172   -440.63     0.23    -122.54    -0.26
  7   0.0190   -487.71     0.10    -133.49     0.02
  8   0.0353   -954.40    -0.08    -232.00     0.33
  9   0.0353   -954.63    -0.12    -232.24     0.13
 10   0.0490  -1371.93    -0.14    -302.59     0.03
 11   0.0490  -1372.04    -0.04    -302.44     0.20
 12   0.0490  -1372.42    -0.08    -302.64     0.05
 13   0.0954  -2914.76     0.07    -449.98    -0.14

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:1

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        43.901    59.293    41.198
ecceobj         0.389     0.644     0.309
incobj         15.048    15.075    15.089
qmin           25.465    20.497    28.123
qmax           65.922   110.394    53.944
amean          44.284    61.216    40.660
amin           42.931    57.046    40.290
amax           46.465    66.077    41.198
emean           0.408     0.652     0.303
emin            0.380     0.631     0.299
emax            0.430     0.671     0.309
imean          11.166    14.740    13.846
imin            9.665    13.581    13.825
imax           13.829    16.097    13.881
excite_mean     0.452     0.700     0.386
fracstop        0.058     0.134     0.001
cjmean          2.854     2.587     2.895

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       191.0      90.2     308.5
kozaiamp        179.8     179.9       1.5