Orbit Fit and Astrometric record for 16WB75

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: 16WB75    
# Created Fri Dec  3 02:13:56 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     12 observations of     12
# Arc:   6.20y
# First observation: 2015/08/23
#  Last observation: 2021/11/05
# Chi-squared of fit:     4.00 DOF:     18 RMS:  0.10
# Min/Max residuals:    -0.21    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.696898E-05  2.905278E-02 -2.734531E-06 -3.922742E-03  2.676855E-02  3.083229E-03
# Covariance matrix:
  1.3799E-12 -1.0146E-13 -3.8943E-14  1.8772E-14  7.9944E-13 -1.9000E-13
 -1.0146E-13  1.0367E-12  1.5441E-13 -1.4940E-13  1.1339E-12  5.5364E-12
 -3.8943E-14  1.5441E-13  3.9180E-13 -1.0743E-13  1.4440E-13  8.5160E-13
  1.8772E-14 -1.4940E-13 -1.0743E-13  5.1359E-14 -1.5501E-13 -8.2224E-13
  7.9944E-13  1.1339E-12  1.4440E-13 -1.5501E-13  1.9384E-12  6.1534E-12
 -1.9000E-13  5.5364E-12  8.5160E-13 -8.2224E-13  6.1534E-12  3.0423E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -19.356532   16.975201    0.743020   -0.228586   -0.651203  2457257.888899
# Heliocentric elements and errors
Epoch:              2457258.5000  =  2015/08/24
Mean Anomaly:           22.05693 +/-     0.042
Argument of Peri:      215.71075 +/-     0.066
Long of Asc Node:      129.48057 +/-     0.001
Inclination:            20.61722 +/-     0.000
Eccentricity:         0.18296255 +/-    0.0001
Semi-Major Axis:     45.43430911 +/-    0.0078
Time of Perihelion: 2450404.9290 +/-      13.2
Perihelion:          37.12153198 +/-    0.0082
Aphelion:            53.74708624 +/-    0.0106
Period (y)              306.2556 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           34.58327506 +/-    0.0018
Ecliptic Y            9.78114427 +/-    0.0005
Ecliptic Z          -12.38201208 +/-    0.0006
Ecliptic XDOT        -0.00071214 +/-    0.0000
Ecliptic YDOT         0.00288368 +/-    0.0000
Ecliptic ZDOT        -0.00048300 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.01294268 +/-    0.0016
Geocenter to KBO     37.35723394 +/-    0.0019
# Hcoef:  7.89

The following table shows the complete astrometric record for 16WB75. 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 (16WB75) followed by the observatory code and reference code for the source of the astrometry.

2015 08  23.38811  01 32 19.789  -11 13 01.26  23.5r 16WB75    W84  C~55bR      
2016 11  30.06859  01 31 58.238  -11 31 35.67  23.6r 16WB75    W84  C~55bR      
2016 11  30.06996  01 31 58.205  -11 31 35.61  24.5g 16WB75    W84  C~55bR      
2016 12  05.03429  01 31 42.780  -11 31 03.05  23.0z 16WB75    W84  C~55bR      
2017 11  09.19148  01 39 57.226  -11 03 33.30  23.1i 16WB75    W84  C~55bR      
2017 11  18.16587  01 39 17.628  -11 05 01.81  23.8r 16WB75    W84  C~55bR      
2017 11  18.16726  01 39 17.628  -11 05 01.98  24.4g 16WB75    W84  C~55bR      
2017 12  22.12613  01 37 35.716  -11 00 43.05  24.0r 16WB75    W84  C~55bR      
2018 11  30.09558  01 45 02.717  -10 38 34.58  24.4g 16WB75    W84  C~55bR      
2021 11  05.241720 02 06 06.282  -09 12 14.16  23.7G 16WB75    G37  C~5BeU      
2021 11  05.296640 02 06 06.002  -09 12 15.17        16WB75    G37  C~5BeU      
2021 11  05.351860 02 06 05.730  -09 12 16.16        16WB75    G37  C~5BeU      

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     0.00       0.00     0.09
     2   1.2722      0.00     0.21       0.00     0.07
     3   1.2722      0.00    -0.21       0.00     0.12
     4   1.2858      0.00    -0.00       0.00    -0.18
     5   2.2144      0.00    -0.09       0.00    -0.06
     6   2.2390      0.00    -0.01       0.00    -0.02
     7   2.2390      0.00     0.08       0.00    -0.18
     8   2.3319      0.00     0.12       0.00     0.07
     9   3.2709      0.00    -0.02       0.00     0.09
    10   6.2036      0.00     0.06       0.00    -0.02
    11   6.2037      0.00    -0.05       0.00    -0.00
    12   6.2039      0.00    -0.02       0.00     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.

16WB75    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        45.985    45.985    45.985
ecceobj         0.193     0.193     0.193
incobj         20.596    20.596    20.596
qmin           36.242    36.241    36.229
qmax           55.591    55.498    55.514
amean          45.657    45.653    45.665
amin           45.238    45.259    45.274
amax           46.135    46.103    46.129
emean           0.188     0.188     0.188
emin            0.173     0.173     0.174
emax            0.205     0.205     0.205
imean          19.094    19.110    19.095
imin           18.558    18.558    18.558
imax           19.619    19.638    19.644
excite_mean     0.377     0.377     0.378
fracstop        1.000     1.000     1.000
cjmean          2.945     2.945     2.945

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       184.5     185.2     184.8
kozaiamp        180.0     180.0     180.0