Orbit Fit and Astrometric record for 13WA139

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: 13WA139   
# Created Tue Apr  1 01:09:55 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     25 observations of     25
# Arc:   5.01y
# First observation: 2013/11/22
#  Last observation: 2018/11/26
# Chi-squared of fit:     6.20 DOF:     44 RMS:  0.09
# Min/Max residuals:    -0.22    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.454254E-05  1.999427E-02  1.100622E-06  2.979935E-04  2.223186E-02 -3.065346E-03
# Covariance matrix:
  2.5928E-13 -1.6210E-13  1.5194E-16 -1.6536E-15 -1.3507E-13 -1.1519E-12
 -1.6210E-13  2.4678E-13 -1.2513E-15  2.4968E-15  4.4605E-14  2.0132E-12
  1.5194E-16 -1.2513E-15  1.6380E-13 -4.0734E-14  1.5315E-15 -9.3788E-15
 -1.6536E-15  2.4968E-15 -4.0734E-14  1.5537E-14  1.6875E-15  2.2764E-14
 -1.3507E-13  4.4605E-14  1.5315E-15  1.6875E-15  4.0082E-13  7.2320E-13
 -1.1519E-12  2.0132E-12 -9.3788E-15  2.2764E-14  7.2320E-13  1.7811E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -2.155792    1.597817   -0.836522   -0.019501   -0.521663  2456618.590508
# Heliocentric elements and errors
Epoch:              2456618.5000  =  2013/11/22
Mean Anomaly:          259.03906 +/-     0.057
Argument of Peri:       49.09128 +/-     0.044
Long of Asc Node:       69.90611 +/-     0.008
Inclination:             2.31029 +/-     0.000
Eccentricity:         0.14324721 +/-    0.0002
Semi-Major Axis:     43.50762902 +/-    0.0051
Time of Perihelion: 2486015.1236 +/-      21.2
Perihelion:          37.27528267 +/-    0.0092
Aphelion:            49.73997538 +/-    0.0100
Period (y)              286.9831 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           45.42892511 +/-    0.0013
Ecliptic Y            2.10709631 +/-    0.0000
Ecliptic Z           -1.69202174 +/-    0.0001
Ecliptic XDOT        -0.00045052 +/-    0.0000
Ecliptic YDOT         0.00244899 +/-    0.0000
Ecliptic ZDOT         0.00005101 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.50931776 +/-    0.0013
Geocenter to KBO     44.98064285 +/-    0.0013
# Hcoef:  6.72

The following table shows the complete astrometric record for 13WA139. 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 (13WA139) followed by the observatory code and reference code for the source of the astrometry.

2013 11  22.08973  00 09 17.601  -01 20 33.05  23.8g 13WA139   W84  C~52Rz      
2013 11  22.09111  00 09 17.598  -01 20 32.90  23.3r 13WA139   W84  C~52S0      
2013 11  22.09392  00 09 17.597  -01 20 32.84  23.0i 13WA139   W84  C~52S0      
2013 11  23.08715  00 09 15.733  -01 20 42.09  23.7r 13WA139   W84  C~52S0      
2013 11  23.10126  00 09 15.692  -01 20 41.96  22.6i 13WA139   W84  C~52S0      
2014 08  18.30786  00 19 12.474  -00 16 07.09  23.1i 13WA139   W84  C~52S0      
2014 10  02.24991  00 16 20.721  -00 35 11.28  23.3r 13WA139   W84  C~52S0      
2014 10  02.25263  00 16 20.708  -00 35 11.62  22.9i 13WA139   W84  C~52S0      
2014 10  28.19540  00 14 39.193  -00 45 37.41  23.4r 13WA139   W84  C~52S0      
2014 11  18.03260  00 13 37.933  -00 51 24.95  23.1z 13WA139   W84  C~52S0      
2015 10  17.16107  00 19 35.852  -00 12 37.55  23.1r 13WA139   W84  C~52S0      
2016 10  23.13956  00 23 25.669  +00 13 38.49  23.1r 13WA139   W84  C~52S0      
2016 11  08.13786  00 22 30.466  +00 08 13.37  23.1i 13WA139   W84  C~52S0      
2016 11  08.13923  00 22 30.446  +00 08 13.26  22.6z 13WA139   W84  C~52S0      
2017 09  27.21025  00 29 30.565  +00 53 54.35  23.4r 13WA139   W84  C~52S0      
2017 09  27.21161  00 29 30.567  +00 53 54.26  22.8i 13WA139   W84  C~52S0      
2017 09  27.21299  00 29 30.563  +00 53 54.23  23.6g 13WA139   W84  C~52S0      
2017 10  29.14670  00 27 21.349  +00 40 32.83  22.7z 13WA139   W84  C~52S0      
2018 09  09.22996  00 35 04.342  +01 31 15.95  22.9z 13WA139   W84  C~52S0      
2018 09  09.33142  00 35 03.958  +01 31 13.28  23.1r 13WA139   W84  C~52S0      
2018 09  09.33280  00 35 03.954  +01 31 13.28  23.0i 13WA139   W84  C~52S0      
2018 10  10.25683  00 32 56.249  +01 17 30.70  23.5r 13WA139   W84  C~52S0      
2018 10  10.25820  00 32 56.244  +01 17 30.73  22.7i 13WA139   W84  C~52S0      
2018 10  18.18917  00 32 23.515  +01 14 08.14  22.8z 13WA139   W84  C~52S0      
2018 11  26.07111  00 30 18.141  +01 02 03.84  24.7g 13WA139   W84  C~52S0      

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     0.01       0.00    -0.19
     2   0.0000      0.00     0.01       0.00    -0.03
     3   0.0000      0.00     0.08       0.00     0.06
     4   0.0027      0.00     0.10       0.00    -0.04
     5   0.0028      0.00    -0.12       0.00     0.21
     6   0.7371      0.00     0.04       0.00     0.15
     7   0.8601      0.00    -0.06       0.00     0.14
     8   0.8601      0.00    -0.09       0.00    -0.13
     9   0.9312      0.00    -0.02       0.00    -0.07
    10   0.9882      0.00     0.04       0.00     0.06
    11   1.9003      0.00     0.00       0.00    -0.13
    12   2.9187      0.00     0.00       0.00    -0.03
    13   2.9625      0.00     0.10       0.00     0.02
    14   2.9625      0.00    -0.14       0.00    -0.06
    15   3.8470      0.00    -0.01       0.00     0.06
    16   3.8470      0.00     0.10       0.00     0.01
    17   3.8470      0.00     0.13       0.00     0.01
    18   3.9344      0.00     0.05       0.00    -0.07
    19   4.7971      0.00    -0.22       0.00     0.10
    20   4.7974      0.00    -0.04       0.00     0.02
    21   4.7974      0.00    -0.02       0.00     0.05
    22   4.8820      0.00     0.04       0.00    -0.03
    23   4.8820      0.00     0.05       0.00     0.04
    24   4.9038      0.00     0.08       0.00     0.03
    25   5.0102      0.00    -0.01       0.00    -0.11

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.

13WA139    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.752    43.752    43.752
ecceobj         0.139     0.139     0.139
incobj          2.310     2.310     2.310
qmin           36.089    36.068    36.076
qmax           51.445    51.455    51.470
amean          43.580    43.582    43.579
amin           43.199    43.178    43.179
amax           44.003    44.016    44.007
emean           0.142     0.141     0.142
emin            0.118     0.118     0.118
emax            0.170     0.170     0.170
imean           1.992     1.990     1.988
imin            1.061     1.062     1.061
imax            3.384     3.381     3.374
excite_mean     0.147     0.146     0.147
fracstop        1.000     1.000     1.000
cjmean          3.070     3.070     3.070

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       169.2     168.9     169.1
kozaiamp        180.0     180.0     179.9