Orbit Fit and Astrometric record for 16SS55

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: 16SS55    
# Created Fri Dec  3 02:13:53 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     62 observations of     62
# Arc:   5.16y
# First observation: 2013/10/03
#  Last observation: 2018/12/01
# Chi-squared of fit:    12.71 DOF:    118 RMS:  0.08
# Min/Max residuals:    -0.26    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.560656E-05  2.333199E-02 -6.837217E-06 -1.120124E-02  2.367868E-02  7.358131E-03
# Covariance matrix:
  1.5315E-13 -5.8760E-14 -1.7402E-14  2.0517E-14  7.0268E-14 -3.8924E-13
 -5.8760E-14  8.4480E-14  2.4911E-14 -4.2333E-14  1.9984E-14  8.3664E-13
 -1.7402E-14  2.4911E-14  8.7990E-14 -3.6304E-14 -9.9692E-16  2.7509E-13
  2.0517E-14 -4.2333E-14 -3.6304E-14  3.2897E-14 -1.1169E-14 -4.6995E-13
  7.0268E-14  1.9984E-14 -9.9692E-16 -1.1169E-14  1.1886E-13  2.4382E-13
 -3.8924E-13  8.3664E-13  2.7509E-13 -4.6995E-13  2.4382E-13  9.2924E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
  -12.911266   27.583476    0.303839   -0.212914   -0.929306  2456568.794858
# Heliocentric elements and errors
Epoch:              2456568.5000  =  2013/10/03
Mean Anomaly:           16.46076 +/-     0.006
Argument of Peri:      158.47108 +/-     0.011
Long of Asc Node:      182.80616 +/-     0.000
Inclination:            28.50262 +/-     0.000
Eccentricity:         0.47693544 +/-    0.0001
Semi-Major Axis:     73.42680958 +/-    0.0154
Time of Perihelion: 2446060.3102 +/-       4.9
Perihelion:          38.40696216 +/-    0.0130
Aphelion:           108.44665700 +/-    0.0250
Period (y)              629.2021 +/-      0.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           37.47039775 +/-    0.0005
Ecliptic Y           19.23590157 +/-    0.0003
Ecliptic Z           -9.43672813 +/-    0.0001
Ecliptic XDOT        -0.00077682 +/-    0.0000
Ecliptic YDOT         0.00263976 +/-    0.0000
Ecliptic ZDOT        -0.00145236 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.16347128 +/-    0.0005
Geocenter to KBO     42.23191028 +/-    0.0006
# Hcoef:  6.55

The following table shows the complete astrometric record for 16SS55. 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 (16SS55) followed by the observatory code and reference code for the source of the astrometry.

2013 10  03.29408  02 00 49.810  -01 27 34.89  23.5g 16SS55    W84  C~4ybs      
2013 10  03.29408  02 00 49.81   -01 27 34.9   23.8g 16SS55    W84  C~3cyk      
2013 10  27.14536  01 59 09.736  -01 40 21.21  23.8g 16SS55    W84  C~4ybs      
2013 11  12.18492  01 58 02.109  -01 47 07.57  22.6z 16SS55    W84  C~4ybs      
2013 11  12.18492  01 58 02.11   -01 47 07.6   22.7z 16SS55    W84  C~3cyk      
2013 11  23.19984  01 57 19.753  -01 50 34.66  22.6i 16SS55    W84  C~4ybs      
2013 11  23.19984  01 57 19.75   -01 50 34.6   22.7i 16SS55    W84  C~3cyk      
2013 11  23.20121  01 57 19.753  -01 50 34.56  21.8z 16SS55    W84  C~4ybs      
2013 11  23.20121  01 57 19.75   -01 50 34.6   22.3z 16SS55    W84  C~3cyk      
2013 12  28.10992  01 55 51.231  -01 53 45.97  22.9r 16SS55    W84  C~4ybs      
2013 12  28.10992  01 55 51.23   -01 53 46.0   23.0r 16SS55    W84  C~3cyk      
2013 12  28.11131  01 55 51.229  -01 53 46.06  22.6i 16SS55    W84  C~4ybs      
2013 12  28.11131  01 55 51.23   -01 53 46.1   22.7i 16SS55    W84  C~3cyk      
2014 08  18.37317  02 08 40.394  -01 09 17.09  23.1z 16SS55    W84  C~4ybs      
2014 10  23.29611  02 05 20.405  -01 45 59.27  22.6i 16SS55    W84  C~4ybs      
2014 10  23.29611  02 05 20.40   -01 45 59.3   22.9i 16SS55    W84  C~3cyk      
2014 11  28.182975 02 02 55.15   -01 59 15.5   23.5g 16SS55    W84  C~352t      
2014 11  28.18350  02 02 55.148  -01 59 15.61  23.8g 16SS55    W84  C~4ybs      
2014 12  26.06893  02 01 43.445  -02 01 24.51  22.5i 16SS55    W84  C~4ybs      
2014 12  26.06893  02 01 43.44   -02 01 24.5   22.7i 16SS55    W84  C~3cyk      
2015 01  14.06383  02 01 29.356  -01 58 27.79  23.0r 16SS55    W84  C~4ybs      
2015 01  14.06383  02 01 29.36   -01 58 27.8   23.1r 16SS55    W84  C~3cyk      
2015 01  19.05354  02 01 30.928  -01 57 08.76  23.9g 16SS55    W84  C~4ybs      
2015 01  19.05354  02 01 30.93   -01 57 08.8   23.9g 16SS55    W84  C~3cyk      
2015 12  04.063368 02 08 22.95   -02 07 42.5   22.7i 16SS55    W84  C~352t      
2015 12  04.06390  02 08 22.947  -02 07 42.51  22.8i 16SS55    W84  C~4ybs      
2016 09  25.26803  02 18 37.692  -01 45 44.35  23.5g 16SS55    W84  C~4ybs      
2016 09  25.26803  02 18 37.69   -01 45 44.3   23.5g 16SS55    W84  C~3cyk      
2016 09  27.42649  02 18 30.29   -01 46 59.8   23.5g 16SS55    568  C~2eAH      
2016 09  27.49838  02 18 30.03   -01 47 02.2   23.6g 16SS55    568  C~2eAH      
2016 09  27.54623  02 18 29.86   -01 47 03.9   23.6g 16SS55    568  C~2eAH      
2016 09  28.43544  02 18 26.76   -01 47 34.8   23.5g 16SS55    568  C~2eAH      
2016 09  28.50767  02 18 26.50   -01 47 37.3   23.6g 16SS55    568  C~2eAH      
2016 09  28.55513  02 18 26.33   -01 47 38.9   23.6g 16SS55    568  C~2eAH      
2016 09  29.56664  02 18 22.73   -01 48 14.0   23.6g 16SS55    568  C~2eAH      
2016 10  27.21542  02 16 31.420  -02 02 56.88  22.7r 16SS55    W84  C~4ybs      
2016 10  27.21542  02 16 31.42   -02 02 56.9   22.8r 16SS55    W84  C~3cyk      
2016 11  27.11136  02 14 25.606  -02 13 47.13  23.0g 16SS55    W84  C~4ybs      
2016 11  27.11136  02 14 25.61   -02 13 47.0   23.3g 16SS55    W84  C~3cyk      
2016 11  29.17841  02 14 18.27   -02 14 12.6   22.5r 16SS55    W84  C~3cyk      
2016 12  05.17833  02 13 58.135  -02 15 12.81  22.6i 16SS55    W84  C~4ybs      
2016 12  05.17833  02 13 58.13   -02 15 12.8   22.9i 16SS55    W84  C~3cyk      
2016 12  05.17971  02 13 58.123  -02 15 12.85  23.5g 16SS55    W84  C~4ybs      
2016 12  05.17971  02 13 58.12   -02 15 12.8   23.6g 16SS55    W84  C~3cyk      
2017 10  29.271227 02 22 00.87   -02 10 55.3   23.0r 16SS55    W84  C~352t      
2017 10  29.27175  02 22 00.873  -02 10 55.34  22.8r 16SS55    W84  C~4ybs      
2017 10  29.272593 02 22 00.86   -02 10 55.5   22.6i 16SS55    W84  C~352t      
2017 10  29.27312  02 22 00.863  -02 10 55.44  22.5i 16SS55    W84  C~4ybs      
2017 10  29.273970 02 22 00.87   -02 10 55.5   23.6g 16SS55    W84  C~352t      
2017 10  29.27450  02 22 00.863  -02 10 55.40  23.5g 16SS55    W84  C~4ybs      
2017 11  23.161157 02 20 17.98   -02 19 51.9   22.7i 16SS55    W84  C~352t      
2017 11  23.16169  02 20 17.979  -02 19 51.82  22.7i 16SS55    W84  C~4ybs      
2017 11  23.162558 02 20 17.97   -02 19 51.8   23.0r 16SS55    W84  C~352t      
2017 11  23.16309  02 20 17.972  -02 19 51.88  23.0r 16SS55    W84  C~4ybs      
2017 11  23.163935 02 20 17.97   -02 19 51.8   24.0g 16SS55    W84  C~352t      
2017 11  23.16446  02 20 17.974  -02 19 51.91  23.6g 16SS55    W84  C~4ybs      
2017 12  15.119456 02 19 05.43   -02 23 06.3   20.9z 16SS55    W84  C~352t      
2018 11  16.22466  02 26 18.610  -02 24 41.85  22.7i 16SS55    W84  C~4ybs      
2018 11  29.19983  02 25 28.235  -02 28 02.24  23.4g 16SS55    W84  C~4ybs      
2018 11  29.20119  02 25 28.229  -02 28 02.23  23.1r 16SS55    W84  C~4ybs      
2018 12  01.06787  02 25 21.517  -02 28 23.30  23.0r 16SS55    W84  C~4ybs      
2018 12  01.06924  02 25 21.511  -02 28 23.18  23.7g 16SS55    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     0.04       0.00    -0.13
     2   0.0000      0.00     0.04       0.00    -0.14
     3   0.0653      0.00    -0.08       0.00     0.11
     4   0.1092      0.00    -0.06       0.00     0.03
     5   0.1092      0.00    -0.07       0.00     0.06
     6   0.1394      0.00    -0.05       0.00     0.05
     7   0.1394      0.00    -0.00       0.00    -0.01
     8   0.1394      0.00     0.03       0.00     0.07
     9   0.1394      0.00     0.07       0.00     0.11
    10   0.2350      0.00    -0.05       0.00    -0.02
    11   0.2350      0.00    -0.04       0.00     0.01
    12   0.2350      0.00    -0.03       0.00    -0.13
    13   0.2350      0.00    -0.04       0.00    -0.09
    14   0.8736      0.00     0.12       0.00     0.04
    15   1.0541      0.00     0.05       0.00     0.04
    16   1.0541      0.00    -0.02       0.00     0.01
    17   1.1523      0.00    -0.03       0.00     0.07
    18   1.1523      0.00    -0.04       0.00    -0.04
    19   1.2287      0.00     0.01       0.00    -0.00
    20   1.2287      0.00     0.09       0.00    -0.01
    21   1.2807      0.00     0.11       0.00    -0.03
    22   1.2807      0.00     0.05       0.00    -0.02
    23   1.2943      0.00     0.07       0.00    -0.01
    24   1.2943      0.00     0.04       0.00     0.03
    25   2.1677      0.00     0.02       0.00     0.02
    26   2.1677      0.00    -0.00       0.00     0.01
    27   2.9787      0.00     0.18       0.00     0.16
    28   2.9787      0.00     0.21       0.00     0.11
    29   2.9846      0.00    -0.10       0.00    -0.01
    30   2.9848      0.00    -0.17       0.00     0.09
    31   2.9849      0.00    -0.17       0.00     0.05
    32   2.9874      0.00    -0.06       0.00     0.02
    33   2.9876      0.00    -0.06       0.00     0.02
    34   2.9877      0.00    -0.04       0.00     0.07
    35   2.9905      0.00    -0.09       0.00    -0.01
    36   3.0662      0.00    -0.03       0.00    -0.07
    37   3.0662      0.00    -0.03       0.00    -0.05
    38   3.1508      0.00    -0.08       0.00    -0.13
    39   3.1508      0.00    -0.14       0.00    -0.26
    40   3.1564      0.00     0.28       0.00    -0.06
    41   3.1729      0.00     0.02       0.00     0.03
    42   3.1729      0.00     0.10       0.00     0.02
    43   3.1729      0.00    -0.06       0.00     0.04
    44   3.1729      0.00    -0.02       0.00    -0.01
    45   4.0711      0.00    -0.01       0.00     0.08
    46   4.0711      0.00     0.07       0.00     0.06
    47   4.0711      0.00    -0.07       0.00    -0.08
    48   4.0711      0.00     0.01       0.00    -0.01
    49   4.0711      0.00     0.17       0.00    -0.04
    50   4.0711      0.00     0.10       0.00     0.07
    51   4.1393      0.00    -0.00       0.00    -0.08
    52   4.1393      0.00     0.01       0.00     0.00
    53   4.1393      0.00    -0.07       0.00     0.04
    54   4.1393      0.00    -0.01       0.00    -0.04
    55   4.1393      0.00     0.01       0.00     0.06
    56   4.1393      0.00     0.10       0.00    -0.04
    57   4.1994      0.00    -0.11       0.00     0.17
    58   5.1196      0.00     0.03       0.00    -0.07
    59   5.1551      0.00     0.02       0.00    -0.07
    60   5.1551      0.00     0.01       0.00    -0.04
    61   5.1602      0.00     0.01       0.00    -0.03
    62   5.1602      0.00    -0.00       0.00     0.11

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.

16SS55    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        74.246    74.246    74.246
ecceobj         0.483     0.483     0.483
incobj         28.431    28.431    28.431
qmin           36.605    36.556    36.584
qmax          111.674   111.429   111.694
amean          73.197    73.199    73.198
amin           72.249    72.269    72.274
amax           74.531    74.418    74.548
emean           0.480     0.480     0.480
emin            0.464     0.464     0.464
emax            0.499     0.498     0.499
imean          27.856    27.852    27.861
imin           27.039    27.017    27.042
imax           28.650    28.650    28.655
excite_mean     0.670     0.670     0.670
fracstop        1.000     1.000     1.000
cjmean          2.829     2.829     2.829

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       204.0     203.6     204.1
kozaiamp        180.0     180.0     180.0