Orbit Fit and Astrometric record for 16GW367

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: 16GW367   
# Created Tue Apr  1 01:10:47 2025
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:  83.93d
# First observation: 2016/03/16
#  Last observation: 2016/06/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000035   0.040373  -0.000006  -0.008549   0.028992   0.000000
# Chi-squared of fit:     6.54 DOF:     26 RMS:  0.11
# Min/Max residuals:    -0.33    0.22
# Exact a, adot, b, bdot, g, gdot:
  2.237269E-05  3.876755E-02 -5.156984E-06 -8.608519E-03  2.876929E-02 -5.180475E-03
# Covariance matrix:
  2.9525E-13  2.8744E-12 -1.5305E-14 -2.2852E-13  1.4532E-12  1.4367E-10
  2.8744E-12  7.6330E-09 -2.9405E-11  1.6488E-10  1.3046E-09 -7.4941E-09
 -1.5305E-14 -2.9405E-11  2.9190E-13 -1.9435E-12 -5.0335E-12  3.0019E-11
 -2.2852E-13  1.6488E-10 -1.9435E-12  2.4022E-11  2.6202E-11 -5.7358E-10
  1.4532E-12  1.3046E-09 -5.0335E-12  2.6202E-11  2.2830E-10 -3.3378E-10
  1.4367E-10 -7.4941E-09  3.0019E-11 -5.7358E-10 -3.3378E-10  1.9791E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   11.079482 -149.959287    0.555681    0.157896   -0.805587  2457463.960299
# Heliocentric elements and errors
Epoch:              2457460.5000  =  2016/03/13
Mean Anomaly:          358.25237 +/-     0.142
Argument of Peri:      157.34385 +/-     1.367
Long of Asc Node:       69.63399 +/-     0.070
Inclination:            16.40078 +/-     0.023
Eccentricity:         0.75712826 +/-    0.0082
Semi-Major Axis:    143.02336883 +/-    4.3793
Time of Perihelion: 2460493.3805 +/-     202.9
Perihelion:          34.73633430 +/-    1.5839
Aphelion:           251.31040336 +/-    7.7840
Period (y)             1710.4828 +/-     78.56
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -30.52147237 +/-    0.0155
Ecliptic Y          -17.00924572 +/-    0.0090
Ecliptic Z            6.67955521 +/-    0.0035
Ecliptic XDOT         0.00212943 +/-    0.0000
Ecliptic YDOT        -0.00303734 +/-    0.0000
Ecliptic ZDOT        -0.00089870 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.57374275 +/-    0.0140
Geocenter to KBO     34.75928897 +/-    0.0183
# Hcoef:  9.27

The following table shows the complete astrometric record for 16GW367. 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 (16GW367) followed by the observatory code and reference code for the source of the astrometry.

2016 03  16.45951  14 07 17.28   -01 05 41.7   24.5z 16GW367   T09  C~89Tb      
2016 03  16.48822  14 07 17.18   -01 05 41.0   25.1z 16GW367   T09  C~89Tb      
2016 03  16.51315  14 07 17.09   -01 05 40.5   25.1z 16GW367   T09  C~89Tb      
2016 03  16.53802  14 07 16.99   -01 05 39.6   24.8z 16GW367   T09  C~89Tb      
2016 03  16.57077  14 07 16.87   -01 05 39.0   24.6z 16GW367   T09  C~89Tb      
2016 04  08.53253  14 05 35.46   -00 55 09.5   24.8r 16GW367   T09  C~89Tb      
2016 04  08.54322  14 05 35.41   -00 55 09.4   24.0r 16GW367   T09  C~89Tb      
2016 04  08.56882  14 05 35.27   -00 55 08.5   24.9r 16GW367   T09  C~89Tb      
2016 04  11.43072  14 05 21.08   -00 53 54.3   24.5i 16GW367   T09  C~89Tb      
2016 04  11.45409  14 05 20.97   -00 53 53.6   24.1i 16GW367   T09  C~89Tb      
2016 04  11.47868  14 05 20.82   -00 53 52.9   24.2i 16GW367   T09  C~89Tb      
2016 04  11.50036  14 05 20.72   -00 53 52.4   24.2i 16GW367   T09  C~89Tb      
2016 04  11.52732  14 05 20.60   -00 53 51.9   24.7i 16GW367   T09  C~89Tb      
2016 04  11.54904  14 05 20.49   -00 53 51.2   24.5i 16GW367   T09  C~89Tb      
2016 06  08.265184 14 00 55.41   -00 40 43.2         16GW367   T09  C~8COT      
2016 06  08.389608 14 00 55.00   -00 40 43.5         16GW367   T09  C~8COT      

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    -0.22       0.00     0.09
     2   0.0001     -1.65    -0.04       0.14     0.06
     3   0.0001     -3.09     0.10       0.15    -0.08
     4   0.0002     -4.81    -0.03       0.47     0.10
     5   0.0003     -6.70     0.16       0.42    -0.15
     6   0.0632  -1651.41     0.10      67.48     0.07
     7   0.0632  -1652.15     0.22      67.32    -0.08
     8   0.0633  -1654.43    -0.03      67.44     0.07
     9   0.0711  -1879.81    -0.06      63.77    -0.08
    10   0.0712  -1881.60     0.04      63.86     0.06
    11   0.0712  -1883.95    -0.33      63.74    -0.00
    12   0.0713  -1885.53    -0.17      63.69    -0.00
    13   0.0714  -1887.39     0.14      63.54    -0.09
    14   0.0714  -1889.18     0.10      63.63     0.05
    15   0.2294  -5894.54     0.01    -567.24     0.00
    16   0.2298  -5900.21    -0.00    -569.64     0.00

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.

16GW367    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       135.869   146.316   127.197
ecceobj         0.745     0.764     0.726
incobj         16.421    16.371    16.485
qmin           32.641    32.901    32.972
qmax          292.462   298.144   247.208
amean         150.256   156.597   131.526
amin          135.869   144.507   126.868
amax          163.234   166.237   140.799
emean           0.771     0.780     0.737
emin            0.741     0.757     0.722
emax            0.792     0.794     0.756
imean          13.975    14.664    14.490
imin           12.775    14.211    13.020
imax           15.678    15.564    15.486
excite_mean     0.808     0.820     0.778
fracstop        1.000     1.000     1.000
cjmean          2.959     2.952     2.965

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       239.0     211.4     201.4
kozaiamp         82.2      45.1      64.2