Orbit Fit and Astrometric record for 13FD28

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: 13FD28    
# Created Mon Jul 16 01:37:59 2018
# Orbit generated from Bernstein formalism
# Fitting   12 observations of   12
# Arc:   2.99y
# First observation: 2013/03/17
#  Last observation: 2016/03/13
Preliminary a, adot, b, bdot, g, gdot:
   0.000054   0.023559   0.000010   0.001857   0.024925   0.000000
# Chi-squared of fit:    28.90 DOF:   18 RMS:  0.27
# Min/Max residuals:    -0.45    0.42
# Exact a, adot, b, bdot, g, gdot:
  1.611031E-05  2.384747E-02  1.933405E-06  1.883214E-03  2.509613E-02  4.770507E-03
# Covariance matrix:
  4.2256E-13 -2.8749E-13  4.1657E-15 -1.0866E-14  3.3231E-13 -1.9006E-12
 -2.8749E-13  9.6586E-13 -2.0771E-14  6.9543E-14  3.8470E-13  1.2563E-11
  4.1657E-15 -2.0771E-14  2.3443E-13 -1.1717E-13 -9.6161E-15 -3.0895E-13
 -1.0866E-14  6.9543E-14 -1.1717E-13  1.2628E-13  4.0428E-14  1.0475E-12
  3.3231E-13  3.8470E-13 -9.6161E-15  4.0428E-14  1.2724E-12  7.4702E-12
 -1.9006E-12  1.2563E-11 -3.0895E-13  1.0475E-12  7.4702E-12  1.8951E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -5.346804 -157.849865    0.426375   -0.083791   -0.895993  2456368.774498
# Heliocentric elements and errors
Epoch:              2456360.5000  =  2013/03/09
Mean Anomaly:           87.17098 +/-     0.103
Argument of Peri:      201.64444 +/-     0.069
Long of Asc Node:      251.07125 +/-     0.005
Inclination:             6.85982 +/-     0.001
Eccentricity:         0.18942727 +/-    0.0005
Semi-Major Axis:     39.70286787 +/-    0.0102
Time of Perihelion: 2434234.6141 +/-      24.8
Perihelion:          32.18206184 +/-    0.0215
Aphelion:            47.22367390 +/-    0.0233
Period (y)              250.1733 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.73866383 +/-    0.0017
Ecliptic Y          -14.90071252 +/-    0.0007
Ecliptic Z           -3.71301795 +/-    0.0002
Ecliptic XDOT         0.00047697 +/-    0.0000
Ecliptic YDOT        -0.00261162 +/-    0.0000
Ecliptic ZDOT         0.00015620 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.74339804 +/-    0.0016
Geocenter to KBO     39.84678004 +/-    0.0018
# Hcoef:  6.52

The following table shows the complete astrometric record for 13FD28. 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 (13FD28) followed by the observatory code and reference code for the source of the astrometry.

2013 03  17.27372  13 13 43.87   -13 34 51.2   22.7r 13FD28    W84  C~2J9e      
2013 03  17.31628  13 13 43.69   -13 34 50.2         13FD28    W84  C~2J9e      
2013 03  17.36301  13 13 43.48   -13 34 49.2         13FD28    W84  C~2J9e      
2013 05  09.08269  13 09 43.32   -13 09 48.0         13FD28    W84  C~2TH2      
2013 05  10.12576  13 09 39.16   -13 09 17.4   22.6r 13FD28    W84  C~2TH2      
2014 03  28.26117  13 18 17.593  -13 55 16.33        13FD28    807  C~14Qh      
2014 03  28.32672  13 18 17.302  -13 55 14.46  22.1r 13FD28    807  C~14Qh      
2014 03  28.36935  13 18 17.100  -13 55 13.70        13FD28    807  C~14Qh      
2014 05  01.26484  13 15 38.844  -13 38 54.79  22.2r 13FD28    304  C~14Qh      
2014 05  02.27723  13 15 34.405  -13 38 24.39        13FD28    304  C~14Qh      
2016 03  13.26497  13 29 58.44   -14 48 24.2   22.6R 13FD28    G37  C~1pQU      
2016 03  13.31385  13 29 58.29   -14 48 24.0         13FD28    G37  C~1pQU      

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    -0.22       0.00    -0.15
  2   0.0001     -2.81    -0.14      -0.07    -0.09
  3   0.0002     -6.02    -0.19      -0.30    -0.19
  4   0.1446  -3818.79     0.25      52.77    -0.21
  5   0.1474  -3886.66     0.26      57.78    -0.03
  6   1.0294   4156.38     0.17     368.12     0.14
  7   1.0296   4151.75     0.31     368.27     0.38
  8   1.0297   4148.74     0.40     367.87     0.04
  9   1.1225   1643.85    -0.40     408.27     0.17
 10   1.1253   1572.46    -0.40     412.01     0.32
 11   2.9897  14823.09    -0.45    1163.03     0.03
 12   2.9898  14820.98     0.42    1162.42    -0.41

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.

13FD28    quality flag:2

Type:       SCATNEAR  SCATNEAR      3:2E

axisobj        39.552    39.582    39.522
ecceobj         0.189     0.190     0.188
incobj          6.856     6.856     6.857
qmin           31.558    31.730    30.207
qmax           48.074    48.071    49.587
amean          39.456    39.473    39.457
amin           38.871    38.819    38.859
amax           40.118    40.174    40.130
emean           0.142     0.150     0.208
emin            0.076     0.102     0.159
emax            0.202     0.198     0.237
imean          14.055     9.827     6.859
imin            8.176     6.075     4.728
imax           16.903    13.424     8.988
excite_mean     0.284     0.230     0.241
fracstop        1.000     1.000     1.000
cjmean          2.956     2.991     2.985

libcent 0      -180.0    -180.0     180.6
libamp  0      -180.0    -180.0     138.2
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       190.8     183.9     177.1
kozaiamp        180.0     180.0      64.5