Orbit Fit and Astrometric record for 13TU228

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: 13TU228   
# Created Tue Apr  1 01:09:49 2025
# Orbit generated from Bernstein formalism
# Fitting     11 observations of     11
# Arc:   4.91y
# First observation: 2013/10/13
#  Last observation: 2018/09/09
Preliminary a, adot, b, bdot, g, gdot:
  -0.000130   0.018285   0.000003  -0.000770   0.021132   0.000000
# Chi-squared of fit:     3.02 DOF:     16 RMS:  0.09
# Min/Max residuals:    -0.23    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.364424E-05  1.823308E-02 -2.085097E-07 -7.678169E-04  2.098094E-02 -1.808948E-04
# Covariance matrix:
  5.9419E-13 -3.6053E-13 -3.9935E-15  9.1763E-15 -1.9890E-13 -2.7385E-12
 -3.6053E-13  4.3985E-13  7.3446E-15 -1.5249E-14  2.0416E-13  4.5158E-12
 -3.9935E-15  7.3446E-15  4.4043E-13 -1.2596E-13  1.0103E-15  8.5135E-14
  9.1763E-15 -1.5249E-14 -1.2596E-13  5.2128E-14 -7.7223E-15 -1.7730E-13
 -1.9890E-13  2.0416E-13  1.0103E-15 -7.7223E-15  5.8674E-13  2.4206E-12
 -2.7385E-12  4.5158E-12  8.5135E-14 -1.7730E-13  2.4206E-12  5.2520E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.501552    5.233699   -0.247596   -0.025205   -0.965875  2456578.620048
# Heliocentric elements and errors
Epoch:              2456570.5000  =  2013/10/05
Mean Anomaly:          186.55917 +/-     0.305
Argument of Peri:       25.73025 +/-     0.304
Long of Asc Node:      154.07954 +/-     0.008
Inclination:             2.81916 +/-     0.001
Eccentricity:         0.06899736 +/-    0.0001
Semi-Major Axis:     45.50685018 +/-    0.0055
Time of Perihelion: 2510591.4772 +/-      94.6
Perihelion:          42.36699775 +/-    0.0071
Aphelion:            48.64670260 +/-    0.0076
Period (y)              306.9894 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           48.38634296 +/-    0.0017
Ecliptic Y            4.68395694 +/-    0.0002
Ecliptic Z           -1.24898632 +/-    0.0001
Ecliptic XDOT        -0.00024931 +/-    0.0000
Ecliptic YDOT         0.00236552 +/-    0.0000
Ecliptic ZDOT        -0.00009940 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.62856778 +/-    0.0017
Geocenter to KBO     47.66231388 +/-    0.0017
# Hcoef:  6.87

The following table shows the complete astrometric record for 13TU228. 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 (13TU228) followed by the observatory code and reference code for the source of the astrometry.

2013 10  13.11927  00 21 35.786  +00 42 02.76  24.0i 13TU228   W84  C~52Rg      
2013 11  23.09414  00 19 32.488  +00 29 15.81  23.6i 13TU228   W84  C~52Rg      
2014 08  18.30926  00 28 50.882  +01 26 53.90  23.1z 13TU228   W84  C~52Rg      
2014 08  18.31064  00 28 50.863  +01 26 54.02  23.2i 13TU228   W84  C~52Rg      
2016 09  09.32608  00 35 26.862  +02 03 10.37  23.6r 13TU228   W84  C~52Rg      
2016 10  02.18440  00 33 59.939  +01 53 33.34  23.0i 13TU228   W84  C~52Rg      
2016 11  18.11310  00 31 19.707  +01 36 47.42  24.1r 13TU228   W84  C~52Rg      
2016 11  30.08866  00 30 55.192  +01 34 26.92  23.2i 13TU228   W84  C~52Rg      
2017 09  27.20200  00 38 14.869  +02 18 04.36  24.0r 13TU228   W84  C~52Rg      
2017 09  27.20337  00 38 14.868  +02 18 04.26  23.9i 13TU228   W84  C~52Rg      
2018 09  09.24289  00 43 17.527  +02 47 51.17  23.2z 13TU228   W84  C~52Rg      

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     0.02       0.00    -0.08
     2   0.1122  -2001.95    -0.00      28.52     0.24
     3   0.8465   7060.27     0.07    -112.19    -0.23
     4   0.8465   7060.05    -0.08    -111.97    -0.01
     5   2.9082  13390.03    -0.03    -460.05     0.17
     6   2.9707  11959.61     0.01    -475.50    -0.05
     7   3.0992   9348.29     0.01    -449.95    -0.06
     8   3.1320   8954.33    -0.05    -433.63     0.01
     9   3.9564  16070.39     0.03    -633.05     0.08
    10   3.9564  16070.34     0.07    -633.13    -0.00
    11   4.9066  20982.48    -0.04    -778.83    -0.06

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.

13TU228    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.761    45.778    45.745
ecceobj         0.063     0.062     0.063
incobj          2.811     2.811     2.811
qmin           41.666    41.693    41.640
qmax           49.574    49.665    49.630
amean          45.542    45.559    45.526
amin           45.177    45.195    45.160
amax           45.916    45.941    45.913
emean           0.067     0.067     0.068
emin            0.055     0.054     0.055
emax            0.080     0.081     0.081
imean           2.453     2.452     2.454
imin            1.981     1.981     1.981
imax            2.885     2.880     2.888
excite_mean     0.080     0.080     0.080
fracstop        1.000     1.000     1.000
cjmean          3.113     3.113     3.112

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       177.4     177.9     177.1
kozaiamp        180.0     180.0     180.0