Orbit Fit and Astrometric record for 16SU55

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: 16SU55    
# Created Thu Dec  9 02:13:53 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     32 observations of     32
# Arc:   7.05y
# First observation: 2013/10/02
#  Last observation: 2020/10/20
# Chi-squared of fit:     9.64 DOF:     58 RMS:  0.10
# Min/Max residuals:    -0.26    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.442608E-05  2.408732E-02  5.900850E-06  1.015161E-02  2.628770E-02  6.882930E-04
# Covariance matrix:
  3.8804E-13 -1.9211E-13  8.5198E-14 -6.3401E-14 -4.1166E-14 -8.8391E-13
 -1.9211E-13  1.2891E-13 -6.8727E-14  4.9953E-14  6.5547E-14  6.9118E-13
  8.5198E-14 -6.8727E-14  2.4509E-13 -8.2169E-14 -4.5275E-14 -4.2239E-13
 -6.3401E-14  4.9953E-14 -8.2169E-14  3.9317E-14  2.6052E-14  3.0971E-13
 -4.1166E-14  6.5547E-14 -4.5275E-14  2.6052E-14  2.2933E-13  3.2955E-13
 -8.8391E-13  6.9118E-13 -4.2239E-13  3.0971E-13  3.2955E-13  4.2974E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
  -16.889878   27.754990    0.323650   -0.275085   -0.906371  2456567.762448
# Heliocentric elements and errors
Epoch:              2456568.5000  =  2013/10/03
Mean Anomaly:          139.18014 +/-     0.142
Argument of Peri:      181.08934 +/-     0.139
Long of Asc Node:       61.47242 +/-     0.000
Inclination:            27.75869 +/-     0.000
Eccentricity:         0.03021865 +/-    0.0001
Semi-Major Axis:     38.06515688 +/-    0.0025
Time of Perihelion: 2423404.6740 +/-      34.0
Perihelion:          36.91487910 +/-    0.0032
Aphelion:            39.21543466 +/-    0.0033
Period (y)              234.8549 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           33.20013373 +/-    0.0006
Ecliptic Y           17.10868754 +/-    0.0003
Ecliptic Z          -11.05187166 +/-    0.0002
Ecliptic XDOT        -0.00084190 +/-    0.0000
Ecliptic YDOT         0.00239370 +/-    0.0000
Ecliptic ZDOT         0.00099099 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.94995557 +/-    0.0005
Geocenter to KBO     38.04061857 +/-    0.0007
# Hcoef:  7.83

The following table shows the complete astrometric record for 16SU55. 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 (16SU55) followed by the observatory code and reference code for the source of the astrometry.

2013 10  02.26167  02 07 04.707  -05 07 25.65  23.3r 16SU55    W84  C~4ybs      
2013 10  02.26305  02 07 04.703  -05 07 25.66  23.4i 16SU55    W84  C~4ybs      
2014 08  19.37785  02 13 44.820  -03 44 19.17  23.9r 16SU55    W84  C~4ybs      
2015 01  17.06699  02 04 48.540  -04 07 54.75  23.1i 16SU55    W84  C~4ybs      
2015 01  19.05770  02 04 48.686  -04 06 48.38  23.8i 16SU55    W84  C~4ybs      
2015 10  10.523797 02 15 09.015  -03 07 15.17  23.6r 16SU55    568  C~2TuW      
2015 10  10.581358 02 15 08.729  -03 07 16.69  23.7r 16SU55    568  C~2TuW      
2015 10  10.605157 02 15 08.615  -03 07 17.30  23.7r 16SU55    568  C~2TuW      
2015 10  14.525580 02 14 49.256  -03 08 58.51  24.2g 16SU55    568  C~2TuW      
2015 10  14.583178 02 14 48.964  -03 08 59.96  24.3g 16SU55    568  C~2TuW      
2015 10  14.606931 02 14 48.841  -03 09 00.53  24.3g 16SU55    568  C~2TuX      
2015 12  04.06665  02 10 41.557  -03 20 08.02  23.8r 16SU55    W84  C~4ybs      
2016 09  10.40460  02 21 27.677  -01 51 47.47  22.9i 16SU55    W84  C~4ybs      
2016 09  11.31942  02 21 24.807  -01 52 13.30  23.8r 16SU55    W84  C~4ybs      
2016 09  27.42649  02 20 24.50   -01 59 47.7   24.3g 16SU55    568  C~2eAH      
2016 09  27.49838  02 20 24.19   -01 59 49.7   24.4g 16SU55    568  C~2eAH      
2016 09  28.43544  02 20 20.17   -02 00 15.9   24.3g 16SU55    568  C~2eAH      
2016 09  28.50767  02 20 19.85   -02 00 18.0   24.3g 16SU55    568  C~2eAH      
2016 09  28.55513  02 20 19.64   -02 00 19.3   24.2g 16SU55    568  C~2eAH      
2016 09  29.44699  02 20 15.77   -02 00 44.2   24.4g 16SU55    568  C~2eAH      
2016 09  29.56664  02 20 15.24   -02 00 47.5   24.5g 16SU55    568  C~2eAH      
2016 10  27.21542  02 17 59.731  -02 12 12.24  24.0r 16SU55    W84  C~4ybs      
2016 11  29.17841  02 15 16.886  -02 18 38.90  23.8r 16SU55    W84  C~4ybs      
2017 10  29.26760  02 22 08.888  -01 10 56.19  23.1r 16SU55    W84  C~4ybs      
2017 10  29.26898  02 22 08.886  -01 10 56.17  23.8i 16SU55    W84  C~4ybs      
2017 12  11.04046  02 18 47.235  -01 16 55.81  23.8r 16SU55    W84  C~4ybs      
2017 12  26.11053  02 18 00.652  -01 14 30.51  22.6z 16SU55    W84  C~4ybs      
2018 11  07.22958  02 25 41.686  -00 11 41.19  23.4i 16SU55    W84  C~4ybs      
2018 11  07.23094  02 25 41.681  -00 11 41.24  23.3r 16SU55    W84  C~4ybs      
2018 11  07.23231  02 25 41.672  -00 11 41.14  24.5g 16SU55    W84  C~4ybs      
2020 10  20.368140 02 35 48.326  +01 57 35.12  23.6G 16SU55    G37  C~4L11      
2020 10  20.447250 02 35 47.916  +01 57 33.42        16SU55    G37  C~4L11      

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    -0.00       0.00     0.04
     2   0.0000      0.00     0.04       0.00     0.07
     3   0.8792      0.00     0.14       0.00     0.01
     4   1.2917      0.00    -0.13       0.00    -0.11
     5   1.2972      0.00     0.19       0.00     0.21
     6   2.0213      0.00    -0.13       0.00    -0.01
     7   2.0214      0.00    -0.14       0.00    -0.01
     8   2.0215      0.00    -0.09       0.00     0.00
     9   2.0322      0.00    -0.15       0.00     0.01
    10   2.0324      0.00    -0.15       0.00     0.01
    11   2.0324      0.00    -0.19       0.00     0.03
    12   2.1706      0.00     0.13       0.00    -0.20
    13   2.9408      0.00     0.10       0.00     0.09
    14   2.9433      0.00     0.10       0.00    -0.26
    15   2.9874      0.00     0.10       0.00     0.03
    16   2.9876      0.00     0.14       0.00     0.05
    17   2.9902      0.00     0.06       0.00     0.08
    18   2.9904      0.00     0.03       0.00    -0.00
    19   2.9905      0.00     0.02       0.00     0.02
    20   2.9930      0.00    -0.01       0.00     0.00
    21   2.9933      0.00     0.05       0.00     0.03
    22   3.0690      0.00     0.03       0.00    -0.09
    23   3.1593      0.00    -0.06       0.00    -0.14
    24   4.0739      0.00    -0.03       0.00    -0.06
    25   4.0739      0.00     0.05       0.00    -0.02
    26   4.1910      0.00    -0.08       0.00     0.05
    27   4.2323      0.00     0.20       0.00     0.02
    28   5.0978      0.00     0.01       0.00     0.06
    29   5.0978      0.00     0.04       0.00     0.04
    30   5.0978      0.00     0.02       0.00     0.16
    31   7.0503      0.00    -0.03       0.00    -0.05
    32   7.0505      0.00    -0.09       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.

16SU55    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        38.252    38.252    38.252
ecceobj         0.029     0.029     0.029
incobj         27.748    27.748    27.748
qmin           36.020    36.010    36.025
qmax           40.217    40.206    40.225
amean          38.030    38.030    38.030
amin           37.750    37.751    37.749
amax           38.311    38.316    38.312
emean           0.037     0.037     0.037
emin            0.026     0.027     0.027
emax            0.050     0.050     0.050
imean          26.227    26.227    26.227
imin           25.568    25.567    25.570
imax           26.869    26.868    26.861
excite_mean     0.444     0.444     0.444
fracstop        1.000     1.000     1.000
cjmean          2.807     2.807     2.807

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       183.2     183.2     183.2
kozaiamp        180.0     179.9     179.9