Orbit Fit and Astrometric record for 16GJ365

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: 16GJ365   
# Created Tue Apr  1 01:10:47 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000031   0.020720   0.000000  -0.000374   0.022305   0.000000
# Chi-squared of fit:     2.55 DOF:     30 RMS:  0.07
# Min/Max residuals:    -0.12    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.425418E-05  2.071401E-02 -2.897947E-07 -3.749933E-04  2.263624E-02 -2.799398E-04
# Covariance matrix:
  2.5675E-13  3.8107E-12  1.2590E-14 -7.9544E-14  1.6704E-12  1.5832E-10
  3.8107E-12  4.2798E-10  1.1318E-12 -8.1466E-12  1.4992E-10  1.5911E-08
  1.2590E-14  1.1318E-12  1.5141E-13 -2.2204E-13  4.0436E-13  4.2388E-11
 -7.9544E-14 -8.1466E-12 -2.2204E-13  7.6708E-13 -2.8693E-12 -3.0370E-10
  1.6704E-12  1.4992E-10  4.0436E-13 -2.8693E-12  5.3570E-11  5.6150E-09
  1.5832E-10  1.5911E-08  4.2388E-11 -3.0370E-10  5.6150E-09  5.9353E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.964174 -175.596588   -0.145422    0.033896   -0.984361  2457480.915394
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          196.05541 +/-    52.440
Argument of Peri:      283.52693 +/-    52.439
Long of Asc Node:       66.12699 +/-     0.059
Inclination:             2.18512 +/-     0.001
Eccentricity:         0.03750077 +/-    0.0099
Semi-Major Axis:     43.59014394 +/-    0.0149
Time of Perihelion: 2505351.8287 +/-   15312.4
Perihelion:          41.95547983 +/-    0.4334
Aphelion:            45.22480805 +/-    0.4335
Period (y)              287.7999 +/-      0.15
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.99526119 +/-    0.0142
Ecliptic Y           -3.61313150 +/-    0.0011
Ecliptic Z            1.51415919 +/-    0.0005
Ecliptic XDOT         0.00022465 +/-    0.0001
Ecliptic YDOT        -0.00250246 +/-    0.0000
Ecliptic ZDOT        -0.00004648 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.16548380 +/-    0.0142
Geocenter to KBO     44.17694850 +/-    0.0143
# Hcoef:  8.18

The following table shows the complete astrometric record for 16GJ365. 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 (16GJ365) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.414605 12 19 16.93   +00 03 10.5   24.1i 16GJ365   T09  C~81Ay      
2016 04  02.441875 12 19 16.81   +00 03 11.3   24.2i 16GJ365   T09  C~81Ay      
2016 04  02.523267 12 19 16.46   +00 03 13.4         16GJ365   T09  C~81Ay      
2016 04  04.345971 12 19 08.90   +00 04 01.4         16GJ365   T09  C~81Ay      
2016 04  04.387256 12 19 08.73   +00 04 02.4         16GJ365   T09  C~81Ay      
2016 04  04.419468 12 19 08.58   +00 04 03.2         16GJ365   T09  C~81Ay      
2016 04  08.511551 12 18 51.74   +00 05 48.8   24.3r 16GJ365   T09  C~81Ay      
2016 06  04.251947 12 16 12.28   +00 21 03.9         16GJ365   T09  C~81Ay      
2016 06  04.270359 12 16 12.26   +00 21 03.9   23.8z 16GJ365   T09  C~81Ay      
2016 06  04.327060 12 16 12.20   +00 21 04.2         16GJ365   T09  C~81Ay      
2016 06  05.339160 12 16 11.22   +00 21 07.6         16GJ365   T09  C~81Ay      
2016 06  05.356114 12 16 11.20   +00 21 07.7   24.1r 16GJ365   T09  C~81Ay      
2017 01  23.60759  12 27 27.75   -00 52 24.5   24.9i 16GJ365   T09  C~81Az      
2017 01  23.61026  12 27 27.76   -00 52 24.5   25.0i 16GJ365   T09  C~81Az      
2017 01  23.62095  12 27 27.73   -00 52 24.5   25.2i 16GJ365   T09  C~81Az      
2017 01  23.64653  12 27 27.70   -00 52 24.2   25.4i 16GJ365   T09  C~81Az      
2017 02  23.521659 12 26 09.74   -00 43 01.6         16GJ365   T09  C~81Az      
2017 02  23.595374 12 26 09.49   -00 42 59.8         16GJ365   T09  C~81Az      

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     0.04       0.00     0.01
     2   0.0001     -1.97    -0.04       0.02     0.05
     3   0.0003     -7.62    -0.09      -0.13    -0.02
     4   0.0053   -130.76     0.03      -1.05     0.13
     5   0.0054   -133.50     0.12      -1.14     0.08
     6   0.0055   -135.88    -0.05      -1.30    -0.04
     7   0.0167   -409.65    -0.01      -4.54    -0.10
     8   0.1720  -2968.51    -0.02    -113.07    -0.04
     9   0.1721  -2968.78     0.01    -113.19    -0.10
    10   0.1722  -2969.73    -0.01    -113.27    -0.01
    11   0.1750  -2984.57     0.04    -115.98    -0.00
    12   0.1751  -2984.89    -0.02    -116.00     0.02
    13   0.8109   8085.07    -0.11    -142.41     0.02
    14   0.8109   8085.21     0.09    -142.35     0.07
    15   0.8110   8084.79    -0.05    -142.53    -0.12
    16   0.8110   8084.26     0.07    -142.43    -0.07
    17   0.8956   6786.06    -0.06     -89.39     0.00
    18   0.8958   6781.90     0.05     -89.22     0.11

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.

16GJ365    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        43.164    43.665    43.132
ecceobj         0.048     0.095     0.054
incobj          2.187     2.185     2.187
qmin           40.393    35.568    40.166
qmax           46.534    52.631    46.696
amean          43.367    43.773    43.338
amin           43.035    43.215    43.000
amax           43.713    44.305    43.687
emean           0.049     0.134     0.053
emin            0.028     0.085     0.032
emax            0.065     0.189     0.069
imean           0.895     2.516     0.897
imin            0.267     0.342     0.324
imax            1.463     5.136     1.467
excite_mean     0.052     0.143     0.055
fracstop        1.000     1.000     1.000
cjmean          3.091     3.072     3.090

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       184.3     177.2     185.3
kozaiamp        180.0     180.0     179.9