Orbit Fit and Astrometric record for 16SZ57

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: 16SZ57    
# Created Fri Mar 29 01:18:49 2024
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   1.85y
# First observation: 2014/11/23
#  Last observation: 2016/09/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000002   0.025405  -0.000000   0.000631   0.025606   0.000000
# Chi-squared of fit:     0.79 DOF:     18 RMS:  0.05
# Min/Max residuals:    -0.06    0.10
# Exact a, adot, b, bdot, g, gdot:
  1.538828E-05  2.542202E-02 -9.746172E-08  6.370100E-04  2.568481E-02  2.869426E-03
# Covariance matrix:
  3.7136E-13  1.2539E-11 -5.2717E-14  2.3319E-13  7.7206E-12  2.3596E-10
  1.2539E-11  1.1322E-08 -1.6895E-11  9.5724E-11  2.4936E-09  1.7880E-07
 -5.2717E-14 -1.6895E-11  2.4438E-13 -2.8697E-13 -4.8652E-12 -2.7519E-10
  2.3319E-13  9.5724E-11 -2.8697E-13  1.0672E-12  2.5351E-11  1.5430E-09
  7.7206E-12  2.4936E-09 -4.8652E-12  2.5351E-11  7.1604E-10  4.0601E-08
  2.3596E-10  1.7880E-07 -2.7519E-10  1.5430E-09  4.0601E-08  2.8326E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
  -16.994297   26.023640   -0.561204   -0.237501   -0.777667  2456984.897241
# Heliocentric elements and errors
Epoch:              2456980.5000  =  2014/11/19
Mean Anomaly:           84.56831 +/-     9.045
Argument of Peri:      176.52061 +/-     6.225
Long of Asc Node:      111.27225 +/-     0.087
Inclination:            16.72595 +/-     0.003
Eccentricity:         0.12444076 +/-    0.0639
Semi-Major Axis:     39.56685578 +/-    0.7529
Time of Perihelion: 2435625.4347 +/-    2201.1
Perihelion:          34.64312630 +/-    2.6120
Aphelion:            44.49058526 +/-    2.6655
Period (y)              248.8889 +/-      7.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           33.93997409 +/-    0.0349
Ecliptic Y           17.19852172 +/-    0.0170
Ecliptic Z          -11.37938759 +/-    0.0118
Ecliptic XDOT        -0.00091247 +/-    0.0002
Ecliptic YDOT         0.00256714 +/-    0.0001
Ecliptic ZDOT        -0.00002436 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   39.71399567 +/-    0.0309
Geocenter to KBO     38.93351891 +/-    0.0406
# Hcoef:  7.85

The following table shows the complete astrometric record for 16SZ57. 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 (16SZ57) followed by the observatory code and reference code for the source of the astrometry.

2014 11  23.396463 02 01 00.589  -05 48 41.74  23.6i 16SZ57    568  C~2Tu9      
2014 11  23.433781 02 01 00.428  -05 48 42.11  23.4i 16SZ57    568  C~2Tu9      
2014 11  23.456477 02 01 00.333  -05 48 42.32  23.5i 16SZ57    568  C~2Tu9      
2014 11  23.471514 02 01 00.266  -05 48 42.33  23.4i 16SZ57    568  C~2Tu9      
2014 11  28.379848 02 00 40.354  -05 49 07.80  23.7r 16SZ57    568  C~2Tu9      
2014 11  28.403031 02 00 40.263  -05 49 07.91  23.7r 16SZ57    568  C~2Tu9      
2014 11  28.417541 02 00 40.208  -05 49 07.90  23.7r 16SZ57    568  C~2Tu9      
2016 09  27.50910  02 16 06.33   -04 20 12.5   24.5g 16SZ57    568  C~2eAJ      
2016 09  27.55640  02 16 06.13   -04 20 14.1   24.6g 16SZ57    568  C~2eAJ      
2016 09  28.44585  02 16 02.52   -04 20 43.5   24.2g 16SZ57    568  C~2eAJ      
2016 09  28.56555  02 16 02.03   -04 20 47.5   24.7g 16SZ57    568  C~2eAJ      
2016 09  29.57736  02 15 57.85   -04 21 20.9   24.3g 16SZ57    568  C~2eAJ      

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     0.05       0.00     0.10
     2   0.0001     -2.38    -0.01       0.52     0.00
     3   0.0002     -3.77    -0.00       0.83    -0.06
     4   0.0002     -4.71    -0.01       1.18     0.05
     5   0.0136   -291.17    -0.04      84.15    -0.02
     6   0.0137   -292.48    -0.03      84.54    -0.06
     7   0.0137   -293.24     0.04      84.84    -0.02
     8   1.8456  14560.74     0.02      48.22    -0.04
     9   1.8457  14557.35    -0.06      47.82    -0.04
    10   1.8482  14496.05    -0.04      40.12     0.07
    11   1.8485  14487.73     0.09      39.06    -0.02
    12   1.8513  14416.99    -0.01      30.74     0.02

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.

16SZ57    quality flag:1

Type:           3:2E   REMOVED CLASSICAL

axisobj        39.908    43.758    38.640
ecceobj         0.127     0.295     0.035
incobj         16.729    16.722    16.735
qmin           33.195    30.424    33.529
qmax           46.410    60.838    43.652
amean          39.457    44.815    38.422
amin           38.947    43.301    38.114
amax           39.993    45.731    38.809
emean           0.132     0.313     0.052
emin            0.104     0.289     0.007
emax            0.161     0.330     0.126
imean          14.869    14.807    12.008
imin           13.886    14.530     8.704
imax           15.911    15.147    16.214
excite_mean     0.289     0.404     0.216
fracstop        1.000     0.004     1.000
cjmean          2.956     2.913     2.987

libcent 0       179.8    -180.0    -180.0
libamp  0       128.5    -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       180.6     193.8     180.1
kozaiamp        180.0       6.1     180.0