Orbit Fit and Astrometric record for 16LX89

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: 16LX89    
# Created Tue Jun 10 01:12:32 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     12 observations of     14
# Arc:   3.07y
# First observation: 2016/05/14
#  Last observation: 2019/06/08
# Chi-squared of fit:     2.17 DOF:     18 RMS:  0.08
# Min/Max residuals:    -0.12    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.272145E-05  1.723485E-02  5.224278E-07  2.280711E-05  2.073027E-02 -5.789334E-05
# Covariance matrix:
  2.7708E-13 -6.4384E-14  5.8463E-15 -7.1165E-16  3.3083E-13 -2.6640E-13
 -6.4384E-14  2.0227E-13  1.5576E-15  2.7089E-16  1.3174E-13  1.2817E-12
  5.8463E-15  1.5576E-15  1.4581E-13 -2.1008E-14  1.9436E-14  1.1655E-14
 -7.1165E-16  2.7089E-16 -2.1008E-14  1.0789E-14 -1.7399E-15  1.6843E-15
  3.3083E-13  1.3174E-13  1.9436E-14 -1.7399E-15  1.1591E-12  9.5331E-13
 -2.6640E-13  1.2817E-12  1.1655E-14  1.6843E-15  9.5331E-13  8.5841E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   13.793380 -117.402043    0.155698    0.237256   -0.965841  2457522.702202
# Heliocentric elements and errors
Epoch:              2457522.5000  =  2016/05/14
Mean Anomaly:          181.90341 +/-     0.075
Argument of Peri:      268.18922 +/-     0.062
Long of Asc Node:      152.76752 +/-     0.001
Inclination:            13.51647 +/-     0.000
Eccentricity:         0.13568165 +/-    0.0001
Semi-Major Axis:     43.33218521 +/-    0.0070
Time of Perihelion: 2509065.2310 +/-      25.3
Perihelion:          37.45280285 +/-    0.0083
Aphelion:            49.21156758 +/-    0.0097
Period (y)              285.2490 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -22.15987267 +/-    0.0011
Ecliptic Y          -42.40511522 +/-    0.0022
Ecliptic Z           11.50116911 +/-    0.0006
Ecliptic XDOT         0.00202506 +/-    0.0000
Ecliptic YDOT        -0.00104735 +/-    0.0000
Ecliptic ZDOT         0.00000110 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   49.20905297 +/-    0.0019
Geocenter to KBO     48.23868547 +/-    0.0025
# Hcoef:  5.74

The following table shows the complete astrometric record for 16LX89. 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 (16LX89) followed by the observatory code and reference code for the source of the astrometry.

2016 05  14.201413 16 12 54.62   -07 08 07.5         16LX89    W84  C~5Xra      
2016 05  14.273489 16 12 54.32   -07 08 06.2         16LX89    W84  C~5Xra      
2016 05  15.246025 16 12 50.36   -07 07 52.6         16LX89    W84  C~5Xra      
2016 05  15.300941 16 12 50.14   -07 07 51.9         16LX89    W84  C~5Xra      
2016 06  09.349163 16 11 07.090  -07 03 29.91  22.3r 16LX89    568  C~4qZm      
2016 06  09.416755 16 11 06.815  -07 03 29.48  22.5r 16LX89    568  C~4qZm      
2016 06  10.336550 16 11 03.145  -07 03 23.66  22.6r 16LX89    568  C~4qZm      
2016 06  10.412916 16 11 02.836  -07 03 23.19  22.4r 16LX89    568  C~4qZm      
2017 07  17.128011 16 12 55.81   -07 14 29.3         16LX89    W84  C~5Xra      
2017 07  17.130090 16 12 55.80   -07 14 29.6         16LX89    W84  C~5Xra      
2019 05  14.186673 16 24 45.33   -07 40 25.3         16LX89    W84  C~5Xra      
2019 06  08.157593 16 23 02.23   -07 35 59.5         16LX89    W84  C~5Xra      
2025 05  27.38276  16 47 29.177  -08 37 53.85  22.9G 16LX89    G37              
2025 05  27.42171  16 47 29.031  -08 37 53.35        16LX89    G37              

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    -0.12
     2   0.0002      0.00     0.02       0.00     0.15
     3   0.0029      0.00    -0.10       0.00    -0.04
     4   0.0030      0.00     0.01       0.00    -0.11
     5   0.0716      0.00    -0.02       0.00     0.02
     6   0.0718      0.00    -0.01       0.00     0.01
     7   0.0743      0.00    -0.01       0.00     0.01
     8   0.0745      0.00    -0.00       0.00     0.01
     9   1.1743      0.00     0.03       0.00     0.21
    10   1.1743      0.00    -0.05       0.00    -0.07
    11   2.9979      0.00    -0.07       0.00    -0.04
    12   3.0663      0.00     0.05       0.00    -0.01
    13   9.0354      0.00 (  -4.03)      0.00 (   0.32)
    14   9.0355      0.00 (  -3.74)      0.00 (   0.45)

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.

16LX89    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        42.953    42.953    42.953
ecceobj         0.145     0.145     0.145
incobj         13.526    13.526    13.526
qmin           36.152    36.119    36.124
qmax           50.718    50.679    50.695
amean          43.246    43.248    43.248
amin           42.889    42.891    42.889
amax           43.652    43.648    43.648
emean           0.145     0.145     0.145
emin            0.128     0.128     0.128
emax            0.162     0.162     0.162
imean          13.098    13.100    13.100
imin           12.218    12.218    12.218
imax           13.954    13.955    13.948
excite_mean     0.269     0.269     0.269
fracstop        1.000     1.000     1.000
cjmean          3.006     3.006     3.006

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       178.9     178.9     178.9
kozaiamp        180.0     180.0     180.0