Orbit Fit and Astrometric record for 16SQ55

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: 16SQ55    
# Created Wed Dec  8 02:13:56 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     52 observations of     52
# Arc:   5.07y
# First observation: 2013/11/04
#  Last observation: 2018/11/29
# Chi-squared of fit:    20.29 DOF:     98 RMS:  0.11
# Min/Max residuals:    -0.32    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.396159E-05  2.103260E-02 -2.092495E-06 -3.577446E-03  2.302243E-02  2.031574E-03
# Covariance matrix:
  3.0085E-13 -2.5133E-13 -3.1836E-14  3.4822E-14 -4.6393E-14 -2.0036E-12
 -2.5133E-13  2.6822E-13  3.7973E-14 -4.1044E-14  2.7884E-14  2.3657E-12
 -3.1836E-14  3.7973E-14  1.2366E-13 -4.5490E-14  2.7162E-15  3.5766E-13
  3.4822E-14 -4.1044E-14 -4.5490E-14  2.3988E-14 -5.4181E-15 -3.8709E-13
 -4.6393E-14  2.7884E-14  2.7162E-15 -5.4181E-15  1.4082E-13  2.9149E-13
 -2.0036E-12  2.3657E-12  3.5766E-13 -3.8709E-13  2.9149E-13  2.2307E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -15.074961   23.440860   -0.306489   -0.244910   -0.909733  2456600.551578
# Heliocentric elements and errors
Epoch:              2456600.5000  =  2013/11/04
Mean Anomaly:           99.24208 +/-     0.078
Argument of Peri:      127.19006 +/-     0.066
Long of Asc Node:      147.47367 +/-     0.001
Inclination:            17.55430 +/-     0.000
Eccentricity:         0.10165755 +/-    0.0002
Semi-Major Axis:     43.22007760 +/-    0.0042
Time of Perihelion: 2427990.3529 +/-      22.8
Perihelion:          38.82643034 +/-    0.0090
Aphelion:            47.61372485 +/-    0.0094
Period (y)              284.1427 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           39.22131949 +/-    0.0006
Ecliptic Y           17.34318539 +/-    0.0003
Ecliptic Z          -11.29704714 +/-    0.0002
Ecliptic XDOT        -0.00088865 +/-    0.0000
Ecliptic YDOT         0.00234192 +/-    0.0000
Ecliptic ZDOT        -0.00047349 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.34766847 +/-    0.0006
Geocenter to KBO     43.43587898 +/-    0.0007
# Hcoef:  6.86

The following table shows the complete astrometric record for 16SQ55. 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 (16SQ55) followed by the observatory code and reference code for the source of the astrometry.

2013 11  04.05080  01 48 55.14   -04 55 25.5         16SQ55    W84  C~3Rlw      
2013 11  04.11428  01 48 54.86   -04 55 26.8   23.4r 16SQ55    W84  C~3Rlw      
2013 11  04.23521  01 48 54.34   -04 55 29.1         16SQ55    W84  C~3Rlw      
2014 09  25.26599  01 56 30.206  -04 22 11.62  23.0r 16SQ55    W84  C~4ybs      
2014 09  25.26599  01 56 30.21   -04 22 11.7   22.8r 16SQ55    W84  C~3cyk      
2014 10  23.28773  01 54 34.557  -04 35 53.40  24.0g 16SQ55    W84  C~4ybs      
2014 10  23.28910  01 54 34.569  -04 35 53.64  23.1r 16SQ55    W84  C~4ybs      
2014 10  23.28910  01 54 34.57   -04 35 53.6   23.3r 16SQ55    W84  C~3cyk      
2014 10  23.29047  01 54 34.567  -04 35 53.49  23.2i 16SQ55    W84  C~4ybs      
2014 10  23.29047  01 54 34.57   -04 35 53.5   23.0i 16SQ55    W84  C~3cyk      
2014 11  28.17932  01 52 09.712  -04 45 42.22  24.0g 16SQ55    W84  C~4ybs      
2014 12  16.14205  01 51 18.844  -04 45 56.45  24.0g 16SQ55    W84  C~4ybs      
2014 12  16.14342  01 51 18.85   -04 45 56.3   23.7r 16SQ55    W84  C~3cyk      
2014 12  16.14342  01 51 18.849  -04 45 56.33  23.6r 16SQ55    W84  C~4ybs      
2014 12  16.14479  01 51 18.858  -04 45 56.38  22.4i 16SQ55    W84  C~4ybs      
2014 12  16.14479  01 51 18.86   -04 45 56.4   22.6i 16SQ55    W84  C~3cyk      
2015 10  10.490606 02 00 16.411  -04 14 51.07  23.1r 16SQ55    568  C~2TuW      
2015 10  10.503339 02 00 16.355  -04 14 51.43  23.2r 16SQ55    568  C~2TuW      
2015 10  10.590069 02 00 15.984  -04 14 54.00  23.2r 16SQ55    568  C~2TuW      
2015 10  14.482071 01 59 59.571  -04 16 46.35  24.0g 16SQ55    568  C~2TuW      
2015 10  14.493297 01 59 59.523  -04 16 46.67  24.1g 16SQ55    568  C~2TuW      
2015 10  14.505211 01 59 59.467  -04 16 47.09  24.1g 16SQ55    568  C~2TuW      
2015 10  14.565827 01 59 59.209  -04 16 48.70  24.1g 16SQ55    568  C~2TuW      
2015 10  14.591882 01 59 59.095  -04 16 49.50  24.3g 16SQ55    568  C~2TuW      
2015 11  15.14808  01 57 44.27   -04 28 24.5   23.6r 16SQ55    W84  C~3cyk      
2015 11  15.14808  01 57 44.268  -04 28 24.50  23.3r 16SQ55    W84  C~4ybs      
2015 11  15.14946  01 57 44.267  -04 28 24.53  23.0g 16SQ55    W84  C~4ybs      
2015 11  15.18934  01 57 44.11   -04 28 25.1   23.3i 16SQ55    W84  C~3cyk      
2015 11  15.18934  01 57 44.107  -04 28 25.14  23.0i 16SQ55    W84  C~4ybs      
2016 09  05.31427  02 06 58.18   -03 41 36.3   22.8r 16SQ55    W84  C~3cyk      
2016 09  05.31427  02 06 58.171  -03 41 36.25  22.5r 16SQ55    W84  C~4ybs      
2016 09  10.40321  02 06 44.81   -03 44 19.2   23.2i 16SQ55    W84  C~3cyk      
2016 09  10.40321  02 06 44.809  -03 44 19.13  22.8i 16SQ55    W84  C~4ybs      
2016 09  11.26251  02 06 42.396  -03 44 46.87  23.0z 16SQ55    W84  C~4ybs      
2016 09  27.42366  02 05 49.03   -03 53 26.7   24.2g 16SQ55    568  C~2eAH      
2016 09  27.49551  02 05 48.76   -03 53 28.9   24.0g 16SQ55    568  C~2eAH      
2016 09  27.54339  02 05 48.58   -03 53 30.5   24.1g 16SQ55    568  C~2eAH      
2016 09  28.43258  02 05 45.27   -03 53 58.6   24.1g 16SQ55    568  C~2eAH      
2016 09  28.50482  02 05 44.99   -03 54 00.8   24.3g 16SQ55    568  C~2eAH      
2016 09  28.55228  02 05 44.81   -03 54 02.4   24.3g 16SQ55    568  C~2eAH      
2016 09  29.44412  02 05 41.45   -03 54 30.5   24.1g 16SQ55    568  C~2eAH      
2016 09  29.56380  02 05 40.98   -03 54 34.2   24.2g 16SQ55    568  C~2eAH      
2016 10  03.23486  02 05 26.78   -03 56 28.5   23.2r 16SQ55    W84  C~3cyk      
2016 10  03.23486  02 05 26.783  -03 56 28.47  23.2r 16SQ55    W84  C~4ybs      
2017 11  01.18806  02 08 07.620  -03 54 09.74  22.9z 16SQ55    W84  C~4ybs      
2017 11  15.18176  02 07 08.311  -03 58 24.33  23.5r 16SQ55    W84  C~4ybs      
2017 11  15.18313  02 07 08.307  -03 58 24.36  22.9i 16SQ55    W84  C~4ybs      
2018 01  05.08117  02 04 49.498  -03 57 58.00  22.5z 16SQ55    W84  C~4ybs      
2018 10  21.17913  02 13 38.045  -03 34 28.28  22.5z 16SQ55    W84  C~4ybs      
2018 11  15.09676  02 11 50.835  -03 43 10.26  22.9i 16SQ55    W84  C~4ybs      
2018 11  29.19158  02 10 56.154  -03 45 45.86  23.4r 16SQ55    W84  C~4ybs      
2018 11  29.19296  02 10 56.154  -03 45 45.90  23.9g 16SQ55    W84  C~4ybs      

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     0.12       0.00    -0.03
     2   0.0002      0.00     0.01       0.00    -0.09
     3   0.0005      0.00     0.02       0.00    -0.03
     4   0.8904      0.00     0.11       0.00    -0.11
     5   0.8904      0.00     0.05       0.00    -0.03
     6   0.9671      0.00    -0.32       0.00     0.10
     7   0.9671      0.00    -0.05       0.00    -0.10
     8   0.9671      0.00    -0.03       0.00    -0.06
     9   0.9671      0.00     0.06       0.00     0.07
    10   0.9671      0.00     0.01       0.00     0.08
    11   1.0654      0.00     0.01       0.00    -0.07
    12   1.1146      0.00    -0.20       0.00    -0.22
    13   1.1146      0.00    -0.06       0.00    -0.07
    14   1.1146      0.00    -0.08       0.00    -0.10
    15   1.1146      0.00     0.10       0.00    -0.16
    16   1.1146      0.00     0.13       0.00    -0.18
    17   1.9314      0.00     0.09       0.00     0.12
    18   1.9314      0.00     0.06       0.00     0.13
    19   1.9317      0.00     0.02       0.00     0.11
    20   1.9423      0.00     0.02       0.00     0.13
    21   1.9423      0.00     0.03       0.00     0.13
    22   1.9424      0.00    -0.04       0.00     0.05
    23   1.9425      0.00     0.03       0.00     0.15
    24   1.9426      0.00     0.01       0.00     0.09
    25   2.0290      0.00     0.02       0.00     0.02
    26   2.0290      0.00     0.05       0.00     0.02
    27   2.0290      0.00     0.09       0.00     0.01
    28   2.0291      0.00     0.13       0.00    -0.03
    29   2.0291      0.00     0.18       0.00     0.01
    30   2.8371      0.00    -0.03       0.00     0.26
    31   2.8371      0.00     0.10       0.00     0.21
    32   2.8511      0.00     0.06       0.00    -0.04
    33   2.8511      0.00     0.08       0.00    -0.11
    34   2.8534      0.00     0.04       0.00    -0.13
    35   2.8977      0.00    -0.20       0.00     0.09
    36   2.8979      0.00    -0.16       0.00     0.17
    37   2.8980      0.00    -0.14       0.00     0.08
    38   2.9004      0.00    -0.09       0.00     0.10
    39   2.9006      0.00    -0.14       0.00     0.18
    40   2.9008      0.00    -0.11       0.00     0.08
    41   2.9032      0.00    -0.08       0.00     0.06
    42   2.9035      0.00    -0.17       0.00     0.12
    43   2.9136      0.00     0.13       0.00    -0.06
    44   2.9136      0.00     0.08       0.00    -0.09
    45   3.9922      0.00    -0.01       0.00    -0.10
    46   4.0305      0.00    -0.00       0.00    -0.00
    47   4.0305      0.00     0.02       0.00    -0.01
    48   4.1698      0.00     0.12       0.00    -0.32
    49   4.9613      0.00    -0.01       0.00    -0.14
    50   5.0296      0.00     0.09       0.00     0.06
    51   5.0681      0.00     0.02       0.00    -0.09
    52   5.0682      0.00     0.10       0.00    -0.12

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.

16SQ55    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        43.469    43.469    43.469
ecceobj         0.103     0.103     0.103
incobj         17.520    17.520    17.520
qmin           38.154    38.163    38.163
qmax           48.539    48.549    48.519
amean          43.203    43.203    43.203
amin           42.864    42.864    42.856
amax           43.565    43.578    43.575
emean           0.100     0.100     0.100
emin            0.087     0.088     0.086
emax            0.114     0.115     0.114
imean          16.591    16.591    16.591
imin           16.089    16.088    16.090
imax           17.155    17.157    17.154
excite_mean     0.303     0.303     0.303
fracstop        1.000     1.000     1.000
cjmean          2.982     2.982     2.982

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       187.8     187.6     187.8
kozaiamp        179.9     180.0     180.0