Orbit Fit and Astrometric record for 16TQ120

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: 16TQ120   
# Created Tue Apr  1 01:11:00 2025
# Orbit generated from Bernstein formalism
# Fitting      6 observations of      6
# Arc:   1.20y
# First observation: 2016/10/06
#  Last observation: 2017/12/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000001   0.011801   0.000000   0.002306   0.015622   0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit:     4.04 DOF:      7 RMS:  0.15
# Min/Max residuals:    -0.31    0.30
# Exact a, adot, b, bdot, g, gdot:
  1.162601E-05  1.192333E-02  2.529258E-06  2.324190E-03  1.578559E-02  5.219324E-03
# Covariance matrix:
  9.9663E-13  2.4920E-11  4.7248E-14  4.7912E-12  3.4144E-11  1.8134E-09
  2.4920E-11  2.4945E-09  4.6662E-12  4.6444E-10  3.3310E-09  1.7625E-07
  4.7248E-14  4.6662E-12  7.4280E-13  2.1970E-13  6.2259E-12  3.2577E-10
  4.7912E-12  4.6444E-10  2.1970E-13  8.8318E-11  6.2079E-10  3.3055E-08
  3.4144E-11  3.3310E-09  6.2259E-12  6.2079E-10  4.4496E-09  2.3552E-07
  1.8134E-09  1.7625E-07  3.2577E-10  3.3055E-08  2.3552E-07  1.2510E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -37.140661   34.113068    0.354137   -0.566984   -0.748932  2457667.880629
# Heliocentric elements and errors
Epoch:              2457660.5000  =  2016/09/29
Mean Anomaly:           48.95765 +/-    24.010
Argument of Peri:      188.00563 +/-     3.446
Long of Asc Node:      106.37914 +/-     0.258
Inclination:            37.91968 +/-     0.041
Eccentricity:         0.41015191 +/-    0.2752
Semi-Major Axis:     73.84981550 +/-   19.5852
Time of Perihelion: 2426136.5489 +/-    9041.9
Perihelion:          43.56017231 +/-   23.3787
Aphelion:           104.13945868 +/-   34.2909
Period (y)              634.6471 +/-    252.47
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.78212681 +/-    0.1767
Ecliptic Y           28.55213895 +/-    0.1197
Ecliptic Z          -38.24834298 +/-    0.1616
Ecliptic XDOT        -0.00035890 +/-    0.0004
Ecliptic YDOT         0.00224649 +/-    0.0003
Ecliptic ZDOT        -0.00022526 +/-    0.0004
# Distances at JD0 (AU)
Heliocenter to KBO   64.09735371 +/-    0.1614
Geocenter to KBO     63.34891750 +/-    0.2677
# Hcoef:  6.57

The following table shows the complete astrometric record for 16TQ120. 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 (16TQ120) followed by the observatory code and reference code for the source of the astrometry.

2016 10  06.37984  02 58 18.758  -22 05 36.48  24.6r 16TQ120   807  C~3wqx      
2016 10  07.38153  02 58 15.889  -22 06 02.15  24.7r 16TQ120   807  C~3wqx      
2017 11  22.07583  02 58 17.377  -21 54 38.31  24.6r 16TQ120   304  C~3wqx      
2017 11  23.05945  02 58 14.111  -21 54 38.83  24.5r 16TQ120   304  C~3wqx      
2017 12  16.12754  02 57 03.696  -21 51 39.13        16TQ120   304  C~3wqx      
2017 12  17.13777  02 57 01.028  -21 51 23.58        16TQ120   304  C~3wqx      

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     0.07       0.00    -0.04
     2   0.0027    -46.39    -0.07      -9.82     0.04
     3   1.1272    215.97    -0.15     622.03     0.30
     4   1.1299    173.30     0.15     637.69    -0.31
     5   1.1930   -679.50     0.04    1153.10     0.04
     6   1.1958   -708.75    -0.04    1180.78    -0.02

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.

16TQ120    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0