Orbit Fit and Astrometric record for 16SY55

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: 16SY55    
# Created Fri Dec  3 02:13:53 2021
# Orbit generated from Bernstein formalism
# Fitting     33 observations of     33
# Arc:   4.11y
# First observation: 2014/09/25
#  Last observation: 2018/11/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000048   0.031468  -0.000039  -0.000831   0.028730   0.000000
# Chi-squared of fit:    12.34 DOF:     60 RMS:  0.11
# Min/Max residuals:    -0.33    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.599064E-05  3.102220E-02 -8.895939E-07 -8.209792E-04  2.862853E-02 -4.693162E-03
# Covariance matrix:
  3.4848E-13 -2.3438E-13 -8.3356E-15  5.0494E-15  6.8448E-14 -1.5356E-12
 -2.3438E-13  2.9224E-13  2.9458E-15 -5.6414E-15  1.8631E-14  2.4698E-12
 -8.3356E-15  2.9458E-15  2.1569E-13 -7.5869E-14 -1.4070E-14  3.1671E-14
  5.0494E-15 -5.6414E-15 -7.5869E-14  3.3573E-14  3.0670E-15 -5.4693E-14
  6.8448E-14  1.8631E-14 -1.4070E-14  3.0670E-15  1.7611E-13  1.3415E-13
 -1.5356E-12  2.4698E-12  3.1671E-14 -5.4693E-14  1.3415E-13  2.3576E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -17.657924   21.980615    0.346360   -0.286150   -0.899421  2456925.759868
# Heliocentric elements and errors
Epoch:              2456920.5000  =  2014/09/20
Mean Anomaly:          308.38375 +/-     0.015
Argument of Peri:      335.16722 +/-     0.030
Long of Asc Node:      116.97836 +/-     0.001
Inclination:            17.27704 +/-     0.000
Eccentricity:         0.18394635 +/-    0.0001
Semi-Major Axis:     39.36377084 +/-    0.0028
Time of Perihelion: 2469854.3379 +/-       3.4
Perihelion:          32.12294880 +/-    0.0061
Aphelion:            46.60459288 +/-    0.0066
Period (y)              246.9751 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.86724415 +/-    0.0005
Ecliptic Y           12.49206835 +/-    0.0002
Ecliptic Z          -10.59555020 +/-    0.0002
Ecliptic XDOT        -0.00153376 +/-    0.0000
Ecliptic YDOT         0.00257753 +/-    0.0000
Ecliptic ZDOT         0.00006144 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.83069502 +/-    0.0004
Geocenter to KBO     34.93018596 +/-    0.0005
# Hcoef:  7.79

The following table shows the complete astrometric record for 16SY55. 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 (16SY55) followed by the observatory code and reference code for the source of the astrometry.

2014 09  25.25909  01 47 31.053  -07 50 29.28  22.6i 16SY55    W84  C~55Zw      
2014 11  27.06097  01 42 19.140  -08 14 59.12  23.4i 16SY55    W84  C~55Zw      
2014 12  24.12239  01 41 01.001  -08 10 34.95  23.7g 16SY55    W84  C~55Zw      
2014 12  24.12375  01 41 01.006  -08 10 34.89  23.0r 16SY55    W84  C~55Zw      
2015 01  14.06682  01 40 50.436  -08 00 42.34  23.3r 16SY55    W84  C~55Zw      
2015 09  04.33612  01 55 37.589  -06 58 59.96  22.7z 16SY55    W84  C~55Zw      
2015 11  15.18655  01 49 55.958  -07 36 46.66  23.8r 16SY55    W84  C~55Zw      
2016 09  27.43401  02 00 51.05   -06 36 47.5   23.7g 16SY55    568  C~2eAH      
2016 09  27.50625  02 00 50.71   -06 36 50.3   23.7g 16SY55    568  C~2eAH      
2016 09  27.55355  02 00 50.48   -06 36 52.2   24.5g 16SY55    568  C~2eAH      
2016 09  28.44300  02 00 46.35   -06 37 26.2   24.1g 16SY55    568  C~2eAH      
2016 09  28.56272  02 00 45.77   -06 37 30.8   23.5g 16SY55    568  C~2eAH      
2016 09  29.45468  02 00 41.57   -06 38 04.7   23.6g 16SY55    568  C~2eAH      
2016 09  29.51512  02 00 41.28   -06 38 07.0   23.8g 16SY55    568  C~2eAH      
2016 09  29.57452  02 00 41.00   -06 38 09.3   24.4g 16SY55    568  C~2eAH      
2016 10  03.23625  02 00 23.323  -06 40 26.04  23.4r 16SY55    W84  C~55Zw      
2016 10  03.23761  02 00 23.315  -06 40 26.07  23.4i 16SY55    W84  C~55Zw      
2016 10  03.23897  02 00 23.317  -06 40 25.88  23.7g 16SY55    W84  C~55Zw      
2016 10  23.20688  01 58 39.139  -06 51 22.01  23.8r 16SY55    W84  C~55Zw      
2017 09  18.38916  02 08 20.923  -05 51 57.79  23.2i 16SY55    W84  C~55Zw      
2017 09  26.28827  02 07 47.485  -05 57 07.75  22.5r 16SY55    W84  C~55Zw      
2017 09  26.28964  02 07 47.483  -05 57 07.70  23.1g 16SY55    W84  C~55Zw      
2017 10  22.21056  02 05 36.603  -06 12 06.43  23.6r 16SY55    W84  C~55Zw      
2017 11  15.17764  02 03 29.170  -06 20 47.28  22.6i 16SY55    W84  C~55Zw      
2017 11  15.17902  02 03 29.168  -06 20 47.23  23.0r 16SY55    W84  C~55Zw      
2017 11  15.18039  02 03 29.157  -06 20 47.28  23.6g 16SY55    W84  C~55Zw      
2017 11  27.14363  02 02 32.421  -06 22 32.25  22.5z 16SY55    W84  C~55Zw      
2017 11  27.14500  02 02 32.421  -06 22 31.99  22.6i 16SY55    W84  C~55Zw      
2017 12  14.06076  02 01 28.241  -06 21 41.64  24.1g 16SY55    W84  C~55Zw      
2018 01  05.07979  02 00 43.354  -06 14 50.23  22.9z 16SY55    W84  C~55Zw      
2018 11  06.17085  02 11 10.474  -05 38 54.44  23.2r 16SY55    W84  C~55Zw      
2018 11  06.17224  02 11 10.480  -05 38 54.54  23.4i 16SY55    W84  C~55Zw      
2018 11  06.17362  02 11 10.468  -05 38 54.56  23.7g 16SY55    W84  C~55Zw      

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     0.24       0.00     0.09
     2   0.1719  -4848.26     0.03     353.22    -0.07
     3   0.2460  -5829.65    -0.13    1027.13    -0.01
     4   0.2460  -5829.56    -0.01    1027.15    -0.02
     5   0.3034  -5757.03    -0.01    1636.10     0.00
     6   0.9420   7871.09    -0.11     154.30    -0.33
     7   1.1387   2305.33    -0.11     -40.14    -0.08
     8   2.0073  12709.52    -0.04    -376.98     0.13
     9   2.0075  12703.75    -0.02    -377.65     0.10
    10   2.0077  12699.84    -0.13    -378.11     0.05
    11   2.0101  12629.75    -0.01    -386.25     0.06
    12   2.0104  12619.97    -0.12    -387.23     0.07
    13   2.0129  12548.95    -0.16    -394.89     0.12
    14   2.0130  12544.06    -0.13    -395.38     0.09
    15   2.0132  12539.31    -0.05    -395.93     0.00
    16   2.0232  12242.70     0.09    -422.69    -0.07
    17   2.0232  12242.58     0.08    -422.67    -0.05
    18   2.0232  12242.68     0.29    -422.50     0.12
    19   2.0779  10552.84     0.13    -442.37     0.15
    20   2.9819  19982.56     0.06    -445.12     0.03
    21   3.0035  19397.79    -0.07    -541.18    -0.01
    22   3.0035  19397.78     0.03    -541.12     0.06
    23   3.0745  17233.42     0.11    -626.63    -0.24
    24   3.1401  15266.01    -0.03    -383.74    -0.03
    25   3.1401  15266.00     0.06    -383.68     0.00
    26   3.1401  15265.83    -0.00    -383.67    -0.00
    27   3.1729  14439.33    -0.07    -158.66    -0.27
    28   3.1729  14439.43     0.12    -158.42    -0.06
    29   3.2192  13569.41     0.13     252.28     0.03
    30   3.2795  13104.22    -0.09     887.98     0.09
    31   4.1147  22648.32    -0.12    -692.33     0.09
    32   4.1148  22648.36     0.04    -692.45    -0.05
    33   4.1148  22648.19    -0.02    -692.40    -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.

16SY55    quality flag:3

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

axisobj        39.665    39.673    39.658
ecceobj         0.184     0.185     0.184
incobj         17.274    17.274    17.274
qmin           31.810    31.797    31.794
qmax           47.749    47.793    47.865
amean          39.456    39.456    39.456
amin           38.968    38.978    38.963
amax           40.006    40.022    39.994
emean           0.177     0.177     0.178
emin            0.160     0.160     0.160
emax            0.195     0.196     0.197
imean          15.754    15.742    15.733
imin           15.269    15.254    15.267
imax           16.257    16.260    16.215
excite_mean     0.324     0.324     0.324
fracstop        1.000     1.000     1.000
cjmean          2.932     2.932     2.932

libcent 0       180.1     180.1     179.9
libamp  0       114.5     113.4     114.9
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       185.6     186.6     183.7
kozaiamp        179.9     180.0     179.9