Orbit Fit and Astrometric record for 16SW105

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: 16SW105   
# Created Fri Dec  3 02:13:55 2021
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   3.00y
# First observation: 2014/10/22
#  Last observation: 2017/10/21
Preliminary a, adot, b, bdot, g, gdot:
  -0.000277   0.021999   0.000175   0.004256   0.025532   0.000000
# Chi-squared of fit:    10.61 DOF:     32 RMS:  0.13
# Min/Max residuals:    -0.32    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.374268E-05  2.157711E-02  3.761660E-06  4.220028E-03  2.440774E-02 -3.674623E-03
# Covariance matrix:
  1.2405E-12 -1.1472E-12 -1.2422E-13 -1.0765E-13 -1.1516E-12 -1.1794E-11
 -1.1472E-12  1.4900E-12 -6.2499E-14  2.0099E-13  6.8798E-13  1.7500E-11
 -1.2422E-13 -6.2499E-14  5.3895E-13 -2.1034E-13  6.0063E-13 -1.2263E-12
 -1.0765E-13  2.0099E-13 -2.1034E-13  1.3066E-13 -2.5561E-14  2.6096E-12
 -1.1516E-12  6.8798E-13  6.0063E-13 -2.5561E-14  2.8556E-12  6.8728E-12
 -1.1794E-11  1.7500E-11 -1.2263E-12  2.6096E-12  6.8728E-12  2.2085E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -28.365739  -49.602464   -0.974514   -0.100012   -0.185567  2456952.518788
# Heliocentric elements and errors
Epoch:              2456950.5000  =  2014/10/20
Mean Anomaly:          234.21600 +/-     0.153
Argument of Peri:       72.29040 +/-     0.134
Long of Asc Node:       18.07120 +/-     0.002
Inclination:            30.40429 +/-     0.000
Eccentricity:         0.19447762 +/-    0.0004
Semi-Major Axis:     36.28054572 +/-    0.0095
Time of Perihelion: 2484839.4416 +/-      32.2
Perihelion:          29.22479158 +/-    0.0160
Aphelion:            43.33629987 +/-    0.0181
Period (y)              218.5340 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           24.24114704 +/-    0.0016
Ecliptic Y          -26.98296098 +/-    0.0019
Ecliptic Z          -19.46495046 +/-    0.0014
Ecliptic XDOT         0.00174947 +/-    0.0000
Ecliptic YDOT         0.00166875 +/-    0.0000
Ecliptic ZDOT         0.00061247 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.16549149 +/-    0.0017
Geocenter to KBO     40.97060553 +/-    0.0028
# Hcoef:  7.59

The following table shows the complete astrometric record for 16SW105. 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 (16SW105) followed by the observatory code and reference code for the source of the astrometry.

2014 10  22.01801  21 32 59.950  -44 37 27.56  23.5r 16SW105   W84  C~55a1      
2015 09  13.10490  21 41 36.916  -44 10 48.96  23.9i 16SW105   W84  C~55a1      
2015 09  13.10626  21 41 36.925  -44 10 49.22  23.7r 16SW105   W84  C~55a1      
2015 09  13.10764  21 41 36.912  -44 10 49.12  24.1g 16SW105   W84  C~55a1      
2015 09  13.10904  21 41 36.905  -44 10 49.05  23.1i 16SW105   W84  C~55a1      
2015 09  13.11041  21 41 36.900  -44 10 49.01  23.7r 16SW105   W84  C~55a1      
2015 09  13.11179  21 41 36.896  -44 10 48.88  24.4g 16SW105   W84  C~55a1      
2016 09  24.07274  21 46 26.367  -43 25 30.99  23.8r 16SW105   W84  C~55a1      
2016 09  24.07412  21 46 26.353  -43 25 31.08  23.2i 16SW105   W84  C~55a1      
2016 10  02.06712  21 45 48.766  -43 23 09.92  23.8r 16SW105   W84  C~55a1      
2016 10  02.06850  21 45 48.791  -43 23 09.92  23.9i 16SW105   W84  C~55a1      
2016 10  02.07125  21 45 48.773  -43 23 09.99  23.9r 16SW105   W84  C~55a1      
2016 10  02.07262  21 45 48.792  -43 23 10.05  24.6g 16SW105   W84  C~55a1      
2016 10  22.01394  21 44 43.371  -43 13 32.05  22.5i 16SW105   W84  C~55a1      
2017 09  12.13355  21 53 21.098  -42 42 18.88  23.7r 16SW105   W84  C~55a1      
2017 09  12.13493  21 53 21.140  -42 42 19.03  24.3g 16SW105   W84  C~55a1      
2017 10  13.10552  21 50 53.258  -42 34 23.90  23.8i 16SW105   W84  C~55a1      
2017 10  21.00733  21 50 30.281  -42 30 16.18  23.8r 16SW105   W84  C~55a1      
2017 10  21.00870  21 50 30.288  -42 30 16.26  24.2g 16SW105   W84  C~55a1      

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    -0.21
     2   0.8928   5736.97    -0.11    -592.45     0.15
     3   0.8928   5736.96    -0.04    -592.73    -0.16
     4   0.8928   5736.87    -0.06    -592.58    -0.06
     5   0.8928   5736.82    -0.02    -592.49    -0.01
     6   0.8928   5736.79     0.02    -592.43     0.01
     7   0.8928   5736.80     0.11    -592.30     0.11
     8   1.9249   9692.53     0.15     675.06     0.10
     9   1.9249   9692.35     0.04     675.03     0.03
    10   1.9467   9372.43    -0.28     968.20     0.27
    11   1.9468   9372.68     0.02     968.09     0.11
    12   1.9468   9372.48    -0.09     968.10     0.02
    13   1.9468   9372.64     0.13     967.97    -0.17
    14   2.0014   8945.60     0.07    1782.55     0.18
    15   2.8915  14919.03    -0.20    1181.29     0.05
    16   2.8915  14919.39     0.24    1180.96    -0.32
    17   2.9763  13626.35    -0.04    2293.17     0.00
    18   2.9979  13496.33    -0.03    2624.13     0.03
    19   2.9979  13496.37     0.02    2624.02    -0.13

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.

16SW105    quality flag:3

Type:           4:3E      4:3E      4:3E
Type:          8:6II     8:6II     8:6II

axisobj        36.383    36.410    36.357
ecceobj         0.194     0.194     0.193
incobj         30.384    30.385    30.384
qmin           27.546    27.497    27.671
qmax           45.717    45.734    45.581
amean          36.474    36.473    36.474
amin           36.158    36.178    36.138
amax           36.846    36.832    36.861
emean           0.208     0.208     0.206
emin            0.167     0.166     0.167
emax            0.242     0.244     0.238
imean          29.891    29.874    29.925
imin           29.063    29.018    29.144
imax           30.847    30.848    30.851
excite_mean     0.540     0.540     0.540
fracstop        1.000     1.000     1.000
cjmean          2.693     2.692     2.693

libcent 0       181.0     180.1     180.5
libamp  0        38.8      26.3      53.9
libcent 1       177.2     178.0     176.5
libamp  1        98.4      75.3     128.9
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        89.2      89.2      89.3
kozaiamp         25.2      25.5      24.8