Orbit Fit and Astrometric record for 16FX185

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: 16FX185   
# Created Tue Apr  1 01:10:46 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     20 observations of     20
# Arc:   5.16y
# First observation: 2012/01/26
#  Last observation: 2017/03/26
# Chi-squared of fit:    32.11 DOF:     34 RMS:  0.22
# Min/Max residuals:    -0.34    0.76
# Exact a, adot, b, bdot, g, gdot:
  1.463594E-05  1.753743E-02 -3.249895E-07  4.977065E-04  1.933381E-02 -8.486595E-03
# Covariance matrix:
  4.9035E-13  9.4201E-13 -2.9211E-16  3.5323E-14  1.0409E-12  1.4285E-11
  9.4201E-13  1.3074E-09 -3.8971E-13  4.2756E-11  1.3064E-09  1.7574E-08
 -2.9211E-16 -3.8971E-13  4.8861E-13 -1.2945E-13 -3.8983E-13 -5.2374E-12
  3.5323E-14  4.2756E-11 -1.2945E-13  1.4319E-12  4.2713E-11  5.7478E-10
  1.0409E-12  1.3064E-09 -3.8983E-13  4.2713E-11  1.3057E-09  1.7560E-08
  1.4285E-11  1.7574E-08 -5.2374E-12  5.7478E-10  1.7560E-08  2.3623E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    9.786618 -155.502157    0.965088    0.033747   -0.195603  2455953.157782
# Heliocentric elements and errors
Epoch:              2455952.5000  =  2012/01/26
Mean Anomaly:          332.20218 +/-     1.811
Argument of Peri:      163.42398 +/-     0.746
Long of Asc Node:      123.94803 +/-     0.005
Inclination:             9.91200 +/-     0.000
Eccentricity:         0.53984061 +/-    0.0297
Semi-Major Axis:     77.55207757 +/-    1.5501
Time of Perihelion: 2475214.2967 +/-    7014.8
Perihelion:          35.68631708 +/-    2.4106
Aphelion:           119.41783806 +/-    3.3166
Period (y)              682.9649 +/-     20.48
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -46.95904643 +/-    0.0846
Ecliptic Y          -20.33858205 +/-    0.0386
Ecliptic Z            8.79179788 +/-    0.0160
Ecliptic XDOT         0.00211389 +/-    0.0001
Ecliptic YDOT        -0.00175942 +/-    0.0000
Ecliptic ZDOT        -0.00013473 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   51.92440860 +/-    0.0781
Geocenter to KBO     51.72325030 +/-    0.0944
# Hcoef:  6.27

The following table shows the complete astrometric record for 16FX185. 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 (16FX185) followed by the observatory code and reference code for the source of the astrometry.

2012 01  26.657016 13 45 03.69   -00 22 39.0         16FX185   T14  C~8Djz      
2012 01  26.659834 13 45 03.70   -00 22 39.0         16FX185   T14  C~8Djz      
2012 01  26.662575 13 45 03.69   -00 22 39.0         16FX185   T14  C~8Djz      
2016 03  07.58831  13 59 59.99   -01 34 08.8   23.3g 16FX185   T09  C~89TP      
2016 03  07.62208  13 59 59.92   -01 34 08.0   23.9g 16FX185   T09  C~89TP      
2016 03  07.63555  13 59 59.88   -01 34 07.6   24.1g 16FX185   T09  C~89TP      
2016 03  16.45267  13 59 35.84   -01 30 38.9   22.8z 16FX185   T09  C~89TP      
2016 03  16.45608  13 59 35.84   -01 30 38.9   23.0z 16FX185   T09  C~89TP      
2016 03  16.48283  13 59 35.76   -01 30 38.0   22.8z 16FX185   T09  C~89TP      
2016 03  16.53534  13 59 35.59   -01 30 37.0   23.4z 16FX185   T09  C~89TP      
2016 03  16.55995  13 59 35.54   -01 30 36.5   23.4z 16FX185   T09  C~89TP      
2016 03  16.58177  13 59 35.46   -01 30 35.8   23.4z 16FX185   T09  C~89TP      
2016 04  15.46627  13 57 51.61   -01 18 42.1   22.3y 16FX185   T09  C~89TP      
2016 04  15.49615  13 57 51.49   -01 18 41.6   22.8y 16FX185   T09  C~89TP      
2016 04  15.52858  13 57 51.37   -01 18 40.7   22.9y 16FX185   T09  C~89TP      
2016 04  15.53670  13 57 51.34   -01 18 40.4   23.4y 16FX185   T09  C~89TP      
2016 06  08.254890 13 54 49.58   -01 05 54.8         16FX185   T09  C~8COS      
2016 06  08.362536 13 54 49.31   -01 05 54.5         16FX185   T09  C~8COS      
2017 03  23.345591 14 03 25.46   -01 50 01.3         16FX185   W84  C~8Djz      
2017 03  26.337226 14 03 15.64   -01 48 48.4         16FX185   W84  C~8Djz      

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     0.16
     2   0.0000      0.00     0.15       0.00     0.13
     3   0.0000      0.00    -0.00       0.00     0.09
     4   4.1121      0.00    -0.16       0.00    -0.22
     5   4.1122      0.00     0.08       0.00    -0.20
     6   4.1122      0.00    -0.00       0.00    -0.11
     7   4.1363      0.00    -0.18       0.00    -0.16
     8   4.1363      0.00    -0.03       0.00    -0.24
     9   4.1364      0.00    -0.02       0.00     0.02
    10   4.1366      0.00    -0.19       0.00    -0.25
    11   4.1366      0.00     0.17       0.00    -0.34
    12   4.1367      0.00    -0.04       0.00    -0.17
    13   4.2185      0.00    -0.10       0.00    -0.02
    14   4.2186      0.00    -0.16       0.00    -0.19
    15   4.2187      0.00    -0.08       0.00    -0.01
    16   4.2187      0.00    -0.06       0.00     0.11
    17   4.3658      0.00     0.09       0.00     0.02
    18   4.3661      0.00    -0.01       0.00    -0.08
    19   5.1545      0.00     0.27       0.00     0.75
    20   5.1627      0.00     0.20       0.00     0.76

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.

16FX185    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        77.271    77.270    77.272
ecceobj         0.539     0.539     0.539
incobj          9.913     9.913     9.913
qmin           34.880    34.808    34.841
qmax          125.663   125.292   125.986
amean          77.800    77.407    78.802
amin           75.892    75.642    76.182
amax           80.783    80.438    80.899
emean           0.540     0.538     0.546
emin            0.523     0.524     0.527
emax            0.556     0.558     0.558
imean           8.061     8.087     8.014
imin            7.233     7.276     7.418
imax            8.817     8.896     8.637
excite_mean     0.558     0.556     0.563
fracstop        1.000     1.000     1.000
cjmean          3.066     3.065     3.067

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       184.2     188.3     181.8
kozaiamp        180.0     180.0     180.0