Orbit Fit and Astrometric record for 16SF57

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: 16SF57    
# Created Fri Dec  3 02:13:54 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     26 observations of     26
# Arc:   5.05y
# First observation: 2013/11/13
#  Last observation: 2018/12/01
# Chi-squared of fit:    11.05 DOF:     46 RMS:  0.12
# Min/Max residuals:    -0.28    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.544201E-05  2.832545E-02  2.259506E-06  3.147763E-03  2.749177E-02  5.613528E-03
# Covariance matrix:
  9.5912E-13 -7.1348E-13  7.7081E-14 -7.1086E-14 -1.3341E-13 -4.1394E-12
 -7.1348E-13  6.6845E-13 -7.9167E-14  7.4185E-14  1.1009E-13  4.3373E-12
  7.7081E-14 -7.9167E-14  3.9463E-13 -1.2339E-13 -2.7313E-14 -5.4736E-13
 -7.1086E-14  7.4185E-14 -1.2339E-13  4.8611E-14  1.5796E-14  5.1209E-13
 -1.3341E-13  1.1009E-13 -2.7313E-14  1.5796E-14  2.6236E-13  7.8006E-13
 -4.1394E-12  4.3373E-12 -5.4736E-13  5.1209E-13  7.8006E-13  2.9928E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -16.038433   25.589601   -0.417344   -0.247353   -0.860938  2456609.612288
# Heliocentric elements and errors
Epoch:              2456610.5000  =  2013/11/14
Mean Anomaly:           63.77127 +/-     0.024
Argument of Peri:      204.38372 +/-     0.017
Long of Asc Node:       93.60200 +/-     0.001
Inclination:            16.89399 +/-     0.000
Eccentricity:         0.20937269 +/-    0.0002
Semi-Major Axis:     39.31751165 +/-    0.0056
Time of Perihelion: 2440659.0543 +/-       6.8
Perihelion:          31.08549848 +/-    0.0089
Aphelion:            47.54952483 +/-    0.0103
Period (y)              246.5399 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.15637139 +/-    0.0006
Ecliptic Y           15.86563897 +/-    0.0003
Ecliptic Z          -10.04960234 +/-    0.0002
Ecliptic XDOT        -0.00066187 +/-    0.0000
Ecliptic YDOT         0.00281188 +/-    0.0000
Ecliptic ZDOT         0.00014697 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.23890547 +/-    0.0005
Geocenter to KBO     36.37445402 +/-    0.0007
# Hcoef:  7.83

The following table shows the complete astrometric record for 16SF57. 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 (16SF57) followed by the observatory code and reference code for the source of the astrometry.

2013 11  13.11151  01 58 04.084  -05 04 09.88  22.2z 16SF57    W84  C~55Zx      
2014 10  29.26414  02 05 07.720  -04 14 31.50  23.9r 16SF57    W84  C~55Zx      
2014 12  16.14751  02 01 38.653  -04 20 40.35  23.3i 16SF57    W84  C~55Zx      
2015 01  17.06418  02 00 55.408  -04 09 45.05  22.7z 16SF57    W84  C~55Zx      
2015 12  04.06528  02 08 00.691  -03 37 22.57  23.3i 16SF57    W84  C~55Zx      
2015 12  04.06665  02 08 00.697  -03 37 22.51  23.2r 16SF57    W84  C~55Zx      
2015 12  05.17199  02 07 56.392  -03 37 23.10  23.9r 16SF57    W84  C~55Zx      
2015 12  05.17336  02 07 56.380  -03 37 23.37  22.9i 16SF57    W84  C~55Zx      
2016 09  10.40460  02 20 01.411  -02 21 15.86  23.5i 16SF57    W84  C~55Zx      
2016 09  27.47408  02 18 58.74   -02 30 35.5   24.7g 16SF57    568  C~2eAI      
2016 09  27.53449  02 18 58.48   -02 30 37.4   24.4g 16SF57    568  C~2eAI      
2016 09  27.59433  02 18 58.22   -02 30 39.4   24.6g 16SF57    568  C~2eAI      
2016 09  28.48334  02 18 54.45   -02 31 08.2   24.4g 16SF57    568  C~2eAI      
2016 09  28.60394  02 18 53.92   -02 31 12.2   24.6g 16SF57    568  C~2eAI      
2016 09  29.54306  02 18 49.86   -02 31 42.5   24.6g 16SF57    568  C~2eAI      
2016 09  29.61594  02 18 49.54   -02 31 45.0   24.4g 16SF57    568  C~2eAI      
2016 11  07.16393  02 15 38.412  -02 48 56.75  23.2i 16SF57    W84  C~55Zx      
2016 11  07.16529  02 15 38.414  -02 48 56.64  23.2z 16SF57    W84  C~55Zx      
2017 10  29.27175  02 21 58.233  -02 01 56.54  24.0r 16SF57    W84  C~55Zx      
2017 10  29.27312  02 21 58.221  -02 01 56.64  23.2i 16SF57    W84  C~55Zx      
2017 11  23.11235  02 19 53.901  -02 08 54.40  22.7z 16SF57    W84  C~55Zx      
2017 11  23.16169  02 19 53.660  -02 08 54.83  23.7i 16SF57    W84  C~55Zx      
2017 11  23.16309  02 19 53.663  -02 08 54.74  23.8r 16SF57    W84  C~55Zx      
2017 12  15.11998  02 18 25.334  -02 09 41.69  23.2z 16SF57    W84  C~55Zx      
2018 12  01.06787  02 24 47.372  -01 26 37.84  23.4r 16SF57    W84  C~55Zx      
2018 12  01.07061  02 24 47.350  -01 26 37.95  23.3r 16SF57    W84  C~55Zx      

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     0.20       0.00    -0.02
     2   0.9587      0.00    -0.06       0.00     0.03
     3   1.0898      0.00    -0.03       0.00    -0.19
     4   1.1771      0.00    -0.23       0.00     0.03
     5   2.0560      0.00    -0.12       0.00     0.21
     6   2.0560      0.00     0.06       0.00     0.27
     7   2.0590      0.00     0.11       0.00     0.11
     8   2.0590      0.00     0.01       0.00    -0.16
     9   2.8263      0.00     0.19       0.00     0.13
    10   2.8730      0.00    -0.10       0.00    -0.01
    11   2.8732      0.00    -0.08       0.00     0.05
    12   2.8733      0.00    -0.10       0.00    -0.01
    13   2.8758      0.00     0.05       0.00     0.04
    14   2.8761      0.00     0.02       0.00    -0.05
    15   2.8787      0.00    -0.08       0.00     0.01
    16   2.8789      0.00    -0.04       0.00    -0.14
    17   2.9844      0.00     0.04       0.00    -0.28
    18   2.9844      0.00     0.17       0.00    -0.15
    19   3.9594      0.00     0.02       0.00     0.06
    20   3.9594      0.00    -0.05       0.00    -0.01
    21   4.0274      0.00     0.11       0.00     0.04
    22   4.0275      0.00    -0.00       0.00     0.08
    23   4.0275      0.00     0.14       0.00     0.18
    24   4.0876      0.00     0.02       0.00    -0.05
    25   5.0485      0.00     0.03       0.00    -0.01
    26   5.0485      0.00    -0.11       0.00    -0.10

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.

16SF57    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.571    39.572    39.571
ecceobj         0.213     0.213     0.213
incobj         16.904    16.904    16.904
qmin           28.136    28.118    28.137
qmax           51.425    51.438    51.420
amean          39.455    39.455    39.455
amin           38.950    38.954    38.961
amax           40.041    40.029    40.039
emean           0.235     0.235     0.235
emin            0.179     0.178     0.179
emax            0.285     0.285     0.285
imean          14.378    14.356    14.370
imin           11.702    11.699    11.698
imax           16.520    16.520    16.519
excite_mean     0.343     0.343     0.343
fracstop        1.000     1.000     1.000
cjmean          2.918     2.918     2.918

libcent 0       180.2     180.0     180.1
libamp  0       101.0     101.1     101.2
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       106.1     107.6     106.5
kozaiamp         94.8      94.8      94.8