Orbit Fit and Astrometric record for 13TD228

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: 13TD228   
# Created Wed Dec  8 02:12:12 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     18 observations of     18
# Arc:   5.15y
# First observation: 2013/10/04
#  Last observation: 2018/11/29
# Chi-squared of fit:     3.77 DOF:     30 RMS:  0.08
# Min/Max residuals:    -0.13    0.19
# Exact a, adot, b, bdot, g, gdot:
  2.034896E-05  3.920676E-02  1.901321E-06  3.651288E-03  3.139785E-02 -2.446307E-03
# Covariance matrix:
  3.0488E-13 -2.2343E-13  9.7399E-15 -1.7592E-14 -4.6720E-14 -9.2639E-13
 -2.2343E-13  4.1544E-13 -2.7866E-14  3.9036E-14  2.6796E-13  2.1046E-12
  9.7399E-15 -2.7866E-14  2.2526E-13 -6.2376E-14 -2.8752E-14 -1.4382E-13
 -1.7592E-14  3.9036E-14 -6.2376E-14  2.9152E-14  2.0746E-14  2.1454E-13
 -4.6720E-14  2.6796E-13 -2.8752E-14  2.0746E-14  5.0866E-13  1.2276E-12
 -9.2639E-13  2.1046E-12 -1.4382E-13  2.1454E-13  1.2276E-12  1.1494E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -14.590237   18.565788    0.134696   -0.249586   -0.959288  2456569.730338
# Heliocentric elements and errors
Epoch:              2456570.5000  =  2013/10/05
Mean Anomaly:          352.14832 +/-     0.010
Argument of Peri:      305.96476 +/-     0.020
Long of Asc Node:       87.67416 +/-     0.001
Inclination:            15.08314 +/-     0.000
Eccentricity:         0.31934401 +/-    0.0001
Semi-Major Axis:     47.75372648 +/-    0.0062
Time of Perihelion: 2459199.3710 +/-      23.2
Perihelion:          32.50385998 +/-    0.0056
Aphelion:            63.00359299 +/-    0.0090
Period (y)              330.0039 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.20010713 +/-    0.0007
Ecliptic Y           10.00456894 +/-    0.0002
Ecliptic Z           -8.02295703 +/-    0.0002
Ecliptic XDOT        -0.00121435 +/-    0.0000
Ecliptic YDOT         0.00319930 +/-    0.0000
Ecliptic ZDOT         0.00036199 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   32.81018871 +/-    0.0006
Geocenter to KBO     31.84939361 +/-    0.0007
# Hcoef:  8.08

The following table shows the complete astrometric record for 13TD228. 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 (13TD228) followed by the observatory code and reference code for the source of the astrometry.

2013 10  04.22956  01 30 37.148  -06 13 54.75  22.8r 13TD228   W84  C~52Rf      
2013 10  04.23211  01 30 37.136  -06 13 54.66  23.1r 13TD228   W84  C~52Rf      
2013 10  04.23349  01 30 37.131  -06 13 54.79  22.4i 13TD228   W84  C~52Rf      
2013 10  13.19407  01 29 47.297  -06 18 49.81  22.4z 13TD228   W84  C~52Rf      
2014 08  18.35265  01 41 46.281  -04 42 13.62  23.1i 13TD228   W84  C~52Rf      
2014 10  29.26115  01 36 21.024  -05 23 03.92  23.0i 13TD228   W84  C~52Rf      
2014 10  29.26704  01 36 20.987  -05 23 03.88  23.3r 13TD228   W84  C~52Rf      
2014 12  22.08681  01 32 45.232  -05 25 08.48  23.9r 13TD228   W84  C~52Rf      
2016 01  12.06424  01 40 25.057  -04 13 56.51  23.7r 13TD228   W84  C~52Rf      
2016 11  07.15230  01 51 34.353  -03 18 57.68  22.4z 13TD228   W84  C~52Rf      
2016 11  10.11848  01 51 18.297  -03 19 49.84  23.1z 13TD228   W84  C~52Rf      
2016 11  28.16262  01 49 50.061  -03 22 49.19  22.9i 13TD228   W84  C~52Rf      
2017 09  14.37901  02 04 21.570  -01 47 02.94  23.0z 13TD228   W84  C~52Rf      
2017 09  25.34659  02 03 33.716  -01 53 30.96  22.8i 13TD228   W84  C~52Rf      
2017 10  29.24832  02 00 29.121  -02 11 13.59  23.0i 13TD228   W84  C~52Rf      
2017 11  23.12484  01 58 14.842  -02 18 19.06  23.3r 13TD228   W84  C~52Rf      
2018 11  29.18468  02 05 48.884  -01 14 35.69  23.6r 13TD228   W84  C~52Rf      
2018 11  29.18606  02 05 48.880  -01 14 35.77  24.1g 13TD228   W84  C~52Rf      

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    -0.11       0.00    -0.06
     2   0.0000      0.00    -0.08       0.00     0.12
     3   0.0000      0.00    -0.04       0.00     0.04
     4   0.0245      0.00     0.05       0.00     0.01
     5   0.8710      0.00     0.10       0.00    -0.08
     6   1.0678      0.00     0.07       0.00    -0.12
     7   1.0679      0.00     0.01       0.00     0.06
     8   1.2152      0.00     0.11       0.00     0.06
     9   2.2720      0.00    -0.13       0.00     0.02
    10   3.0936      0.00    -0.09       0.00    -0.02
    11   3.1017      0.00     0.19       0.00    -0.03
    12   3.1511      0.00     0.05       0.00     0.03
    13   3.9457      0.00     0.12       0.00    -0.05
    14   3.9757      0.00    -0.08       0.00    -0.04
    15   4.0685      0.00    -0.05       0.00     0.12
    16   4.1366      0.00    -0.11       0.00    -0.09
    17   5.1525      0.00     0.01       0.00     0.08
    18   5.1525      0.00     0.05       0.00     0.01

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.

13TD228    quality flag:2

Type:           2:1E  SCATNEAR  SCATNEAR

axisobj        48.097    48.096    48.097
ecceobj         0.324     0.324     0.324
incobj         15.092    15.092    15.092
qmin           31.715    31.719    31.706
qmax           64.893    64.893    64.909
amean          47.796    47.796    47.796
amin           47.185    47.190    47.174
amax           48.560    48.563    48.582
emean           0.265     0.234     0.238
emin            0.176     0.085     0.097
emax            0.337     0.337     0.338
imean          16.666    17.642    17.555
imin           13.019    13.021    13.016
imax           20.144    21.947    21.840
excite_mean     0.395     0.394     0.394
fracstop        1.000     1.000     1.000
cjmean          2.953     2.953     2.953

libcent 0       175.8    -180.0    -180.0
libamp  0       146.1    -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       134.4     151.8     124.3
kozaiamp        180.0     180.0     180.0