Orbit Fit and Astrometric record for 16RX81

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: 16RX81    
# Created Tue Apr  1 01:10:51 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     11 observations of     11
# Arc:   5.04y
# First observation: 2013/10/04
#  Last observation: 2018/10/18
# Chi-squared of fit:     3.59 DOF:     16 RMS:  0.10
# Min/Max residuals:    -0.24    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.565062E-05  2.312779E-02  1.767941E-07  6.850216E-05  2.382456E-02 -6.224523E-05
# Covariance matrix:
  6.5662E-13 -4.1167E-13  5.7511E-17 -9.8066E-16 -4.8215E-14 -2.5948E-12
 -4.1167E-13  6.9126E-13 -2.0913E-15  2.4695E-15  3.2860E-13  6.2116E-12
  5.7511E-17 -2.0913E-15  5.3519E-13 -1.4178E-13 -1.0436E-14 -2.2317E-14
 -9.8066E-16  2.4695E-15 -1.4178E-13  5.0037E-14  1.9345E-15  2.4069E-14
 -4.8215E-14  3.2860E-13 -1.0436E-14  1.9345E-15  1.1938E-12  3.4086E-12
 -2.5948E-12  6.2116E-12 -2.2317E-14  2.4069E-14  3.4086E-12  6.0221E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -4.902393    0.437857   -0.180343   -0.083976   -0.980356  2456569.727038
# Heliocentric elements and errors
Epoch:              2456570.5000  =  2013/10/05
Mean Anomaly:          358.31110 +/-     0.769
Argument of Peri:      273.95284 +/-     0.808
Long of Asc Node:       88.49953 +/-     0.007
Inclination:             4.79373 +/-     0.000
Eccentricity:         0.02439044 +/-    0.0001
Semi-Major Axis:     44.02723945 +/-    0.0077
Time of Perihelion: 2457071.0891 +/-     229.7
Perihelion:          42.95339589 +/-    0.0095
Aphelion:            45.10108301 +/-    0.0098
Period (y)              292.1396 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.80080741 +/-    0.0019
Ecliptic Y            0.51054030 +/-    0.0000
Ecliptic Z           -3.58701618 +/-    0.0002
Ecliptic XDOT        -0.00003293 +/-    0.0000
Ecliptic YDOT         0.00265629 +/-    0.0000
Ecliptic ZDOT         0.00000859 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.95388798 +/-    0.0019
Geocenter to KBO     41.97352701 +/-    0.0019
# Hcoef:  7.30

The following table shows the complete astrometric record for 16RX81. 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 (16RX81) followed by the observatory code and reference code for the source of the astrometry.

2013 10  04.22626  00 09 25.271  -04 19 22.59  23.9r 16RX81    W84  C~52Zi      
2013 10  04.22766  00 09 25.280  -04 19 22.59  23.1i 16RX81    W84  C~52Zi      
2014 11  13.14698  00 11 50.115  -04 00 44.48  22.6z 16RX81    W84  C~52Zi      
2016 09  09.34532  00 25 44.076  -02 31 41.72  23.6r 16RX81    W84  C~52Zi      
2016 09  10.34056  00 25 40.028  -02 32 10.12  22.6z 16RX81    W84  C~52Zi      
2016 11  25.09132  00 20 57.155  -02 59 10.51  23.7i 16RX81    W84  C~52Zi      
2017 09  18.23881  00 29 58.132  -02 03 38.77  23.5i 16RX81    W84  C~52Zi      
2017 09  18.24019  00 29 58.137  -02 03 39.03  23.9r 16RX81    W84  C~52Zi      
2017 09  27.21712  00 29 19.334  -02 07 54.64  24.5g 16RX81    W84  C~52Zi      
2017 10  22.18983  00 27 32.463  -02 18 42.74  23.0i 16RX81    W84  C~52Zi      
2018 10  18.18369  00 32 39.758  -01 44 51.56  23.8i 16RX81    W84  C~52Zi      

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    -0.05       0.00    -0.05
     2   0.0000      0.00     0.18       0.00    -0.01
     3   1.1086      0.00    -0.24       0.00     0.14
     4   2.9326      0.00    -0.05       0.00     0.01
     5   2.9353      0.00     0.06       0.00    -0.05
     6   3.1427      0.00     0.14       0.00     0.02
     7   3.9562      0.00    -0.09       0.00     0.04
     8   3.9562      0.00     0.07       0.00    -0.18
     9   3.9808      0.00     0.11       0.00     0.05
    10   4.0492      0.00     0.00       0.00    -0.02
    11   5.0375      0.00    -0.07       0.00     0.09

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.

16RX81    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.284    44.283    44.284
ecceobj         0.030     0.030     0.030
incobj          4.796     4.796     4.796
qmin           42.015    42.015    42.015
qmax           46.336    46.337    46.334
amean          44.072    44.072    44.072
amin           43.736    43.734    43.739
amax           44.433    44.433    44.433
emean           0.028     0.028     0.028
emin            0.012     0.012     0.012
emax            0.043     0.043     0.043
imean           3.061     3.061     3.061
imin            2.446     2.446     2.446
imax            3.657     3.657     3.657
excite_mean     0.061     0.061     0.061
fracstop        1.000     1.000     1.000
cjmean          3.098     3.098     3.098

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       178.0     177.9     178.1
kozaiamp        180.0     180.0     180.0