Orbit Fit and Astrometric record for 16UQ273

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: 16UQ273   
# Created Thu Dec  9 02:13:59 2021
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:   3.22y
# First observation: 2015/08/18
#  Last observation: 2018/11/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000005   0.024432   0.000031   0.010932   0.025763   0.000000
# Chi-squared of fit:     1.26 DOF:     24 RMS:  0.05
# Min/Max residuals:    -0.11    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.459888E-05  2.444152E-02  6.663661E-06  1.095688E-02  2.577189E-02  3.636923E-03
# Covariance matrix:
  6.3748E-13 -5.5234E-14  7.0186E-16  2.6572E-14  3.9022E-13  5.4220E-13
 -5.5234E-14  2.6430E-12 -6.3596E-13  1.2750E-12  2.7138E-12  3.4976E-11
  7.0186E-16 -6.3596E-13  5.3546E-13 -4.8772E-13 -6.4885E-13 -8.8527E-12
  2.6572E-14  1.2750E-12 -4.8772E-13  7.4209E-13  1.3302E-12  1.7643E-11
  3.9022E-13  2.7138E-12 -6.4885E-13  1.3302E-12  3.1817E-12  3.6295E-11
  5.4220E-13  3.4976E-11 -8.8527E-12  1.7643E-11  3.6295E-11  4.8469E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -16.955266   20.098739    0.831603   -0.169517   -0.556595  2457252.907119
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:           44.68605 +/-     0.104
Argument of Peri:      264.97367 +/-     0.189
Long of Asc Node:       52.03864 +/-     0.001
Inclination:            28.72603 +/-     0.001
Eccentricity:         0.14807842 +/-    0.0007
Semi-Major Axis:     43.37901731 +/-    0.0073
Time of Perihelion: 2444296.9904 +/-      30.0
Perihelion:          36.95552110 +/-    0.0320
Aphelion:            49.80251352 +/-    0.0325
Period (y)              285.7115 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           35.68360636 +/-    0.0024
Ecliptic Y           12.17331698 +/-    0.0009
Ecliptic Z          -11.31538683 +/-    0.0008
Ecliptic XDOT        -0.00022843 +/-    0.0000
Ecliptic YDOT         0.00267568 +/-    0.0000
Ecliptic ZDOT         0.00100078 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.36429077 +/-    0.0022
Geocenter to KBO     38.80196219 +/-    0.0027
# Hcoef:  6.95

The following table shows the complete astrometric record for 16UQ273. 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 (16UQ273) followed by the observatory code and reference code for the source of the astrometry.

2015 08  18.40633  01 39 43.699  -07 51 47.98  22.6r 16UQ273   W84  C~55b1      
2015 08  18.40770  01 39 43.685  -07 51 48.12  23.4g 16UQ273   W84  C~55b1      
2016 10  28.18004  01 39 05.281  -07 17 31.79  23.1r 16UQ273   W84  C~55b1      
2016 11  03.24731  01 38 35.140  -07 18 58.50  23.0r 16UQ273   W84  C~55b1      
2016 11  04.15990  01 38 30.686  -07 19 09.71  22.7i 16UQ273   W84  C~55b1      
2016 11  04.16127  01 38 30.687  -07 19 09.75  23.4g 16UQ273   W84  C~55b1      
2016 11  28.09529  01 36 46.232  -07 20 43.22  22.6i 16UQ273   W84  C~55b1      
2016 11  28.09667  01 36 46.218  -07 20 43.36  23.0r 16UQ273   W84  C~55b1      
2016 11  28.17735  01 36 45.914  -07 20 42.91  23.2g 16UQ273   W84  C~55b1      
2017 11  16.11931  01 41 51.721  -06 14 26.19  22.8r 16UQ273   W84  C~55b1      
2017 11  17.13031  01 41 47.237  -06 14 31.38  22.6i 16UQ273   W84  C~55b1      
2017 11  18.12651  01 41 42.866  -06 14 35.64  23.2g 16UQ273   W84  C~55b1      
2018 09  21.36019  01 50 34.439  -04 49 36.47  23.1i 16UQ273   W84  C~55b1      
2018 11  07.19230  01 46 47.724  -05 06 57.55  22.8r 16UQ273   W84  C~55b1      
2018 11  07.19367  01 46 47.722  -05 06 57.62  23.4g 16UQ273   W84  C~55b1      

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     0.08       0.00     0.01
     2   0.0000     -0.25    -0.11      -0.05    -0.02
     3   1.1958    245.94     0.07    2119.92    -0.03
     4   1.2124   -202.17     0.03    2208.50     0.06
     5   1.2149   -267.78    -0.07    2223.06     0.01
     6   1.2149   -267.79     0.03    2223.02    -0.06
     7   1.2805  -1743.08     0.11    2720.82     0.03
     8   1.2805  -1743.33    -0.07    2720.76    -0.05
     9   1.2807  -1747.35    -0.03    2722.88     0.02
    10   2.2470   3971.94     0.01    4690.89     0.10
    11   2.2498   3908.04    -0.04    4711.37    -0.04
    12   2.2525   3846.06    -0.04    4732.07     0.01
    13   3.0936  13146.49     0.02    6440.25    -0.02
    14   3.2219   9605.16    -0.02    6766.76     0.03
    15   3.2219   9605.10     0.02    6766.70    -0.05

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.

16UQ273    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.835    43.860    43.809
ecceobj         0.155     0.157     0.154
incobj         28.665    28.665    28.666
qmin           36.518    36.448    36.513
qmax           50.938    51.084    50.864
amean          43.583    43.606    43.553
amin           43.222    43.238    43.215
amax           43.974    44.018    43.952
emean           0.140     0.141     0.140
emin            0.122     0.121     0.123
emax            0.159     0.162     0.158
imean          27.829    27.842    27.814
imin           27.400    27.369    27.377
imax           28.247    28.302    28.228
excite_mean     0.488     0.488     0.487
fracstop        1.000     1.000     1.000
cjmean          2.798     2.798     2.798

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       177.7     180.9     175.8
kozaiamp        180.0     180.0     180.0