Orbit Fit and Astrometric record for 16SW57

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: 16SW57    
# Created Sun Dec 22 02:10:52 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     24 observations of     24
# Arc:   5.06y
# First observation: 2013/11/08
#  Last observation: 2018/12/01
# Chi-squared of fit:     6.79 DOF:     42 RMS:  0.09
# Min/Max residuals:    -0.18    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.443839E-05  2.045863E-02  1.707774E-06  1.940049E-03  2.233380E-02 -3.769031E-03
# Covariance matrix:
  3.1964E-13 -2.0810E-13  8.9077E-15 -1.4996E-14 -2.3613E-14 -1.5159E-12
 -2.0810E-13  3.4447E-13 -2.0219E-14  3.4950E-14  4.2305E-14  3.5360E-12
  8.9077E-15 -2.0219E-14  2.6249E-13 -7.3502E-14 -1.1452E-14 -2.2383E-13
 -1.4996E-14  3.4950E-14 -7.3502E-14  2.9136E-14  5.0553E-15  3.8720E-13
 -2.3613E-14  4.2305E-14 -1.1452E-14  5.0553E-15  2.0653E-13  4.6466E-13
 -1.5159E-12  3.5360E-12 -2.2383E-13  3.8720E-13  4.6466E-13  3.9176E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
  -12.650207   34.681694   -0.188454   -0.212604   -0.947888  2456604.730878
# Heliocentric elements and errors
Epoch:              2456604.5000  =  2013/11/08
Mean Anomaly:          285.35046 +/-     0.027
Argument of Peri:       28.69792 +/-     0.020
Long of Asc Node:      100.81182 +/-     0.002
Inclination:            13.52566 +/-     0.000
Eccentricity:         0.17866379 +/-    0.0003
Semi-Major Axis:     46.47088030 +/-    0.0051
Time of Perihelion: 2480598.0436 +/-      17.4
Perihelion:          38.16821654 +/-    0.0145
Aphelion:            54.77354405 +/-    0.0151
Period (y)              316.7959 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.61659685 +/-    0.0007
Ecliptic Y           25.57002860 +/-    0.0005
Ecliptic Z           -9.80567392 +/-    0.0002
Ecliptic XDOT        -0.00176114 +/-    0.0000
Ecliptic YDOT         0.00183378 +/-    0.0000
Ecliptic ZDOT         0.00033338 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.72486772 +/-    0.0007
Geocenter to KBO     44.77534286 +/-    0.0009
# Hcoef:  6.98

The following table shows the complete astrometric record for 16SW57. 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 (16SW57) followed by the observatory code and reference code for the source of the astrometry.

2013 11  08.23010  02 26 30.781  +01 08 29.16  23.4r 16SW57    W84  C~4ybt      
2013 11  23.21444  02 25 28.411  +01 04 54.22  23.4z 16SW57    W84  C~4ybt      
2013 12  01.18848  02 24 58.008  +01 03 41.25  23.1r 16SW57    W84  C~4ybt      
2013 12  20.13920  02 23 58.769  +01 02 57.95  22.8i 16SW57    W84  C~4ybt      
2014 10  21.30882  02 32 07.873  +01 44 02.16  23.1r 16SW57    W84  C~4ybt      
2015 01  16.06930  02 27 31.18   +01 36 13.5   22.0z 16SW57    W84  C~3cyl      
2016 09  10.36578  02 43 07.369  +02 59 25.32  23.4r 16SW57    W84  C~4ybt      
2016 09  27.49201  02 42 19.85   +02 52 35.7   24.6g 16SW57    568  C~2eAJ      
2016 09  27.61245  02 42 19.44   +02 52 32.8   24.6g 16SW57    568  C~2eAJ      
2016 09  28.50135  02 42 16.49   +02 52 10.9   24.5g 16SW57    568  C~2eAJ      
2016 09  28.54927  02 42 16.32   +02 52 09.8   24.6g 16SW57    568  C~2eAJ      
2016 09  29.51325  02 42 13.06   +02 51 46.1   24.5g 16SW57    568  C~2eAJ      
2016 09  29.56047  02 42 12.89   +02 51 44.9   24.6g 16SW57    568  C~2eAJ      
2016 09  29.63378  02 42 12.64   +02 51 43.2   24.7g 16SW57    568  C~2eAJ      
2016 12  21.12749  02 36 47.406  +02 30 54.01  23.7r 16SW57    W84  C~4ybt      
2017 10  30.23247  02 44 34.769  +03 09 49.14  22.9i 16SW57    W84  C~4ybt      
2017 11  01.17965  02 44 26.155  +03 09 09.73  23.1z 16SW57    W84  C~4ybt      
2017 11  23.14743  02 42 49.988  +03 03 10.03  23.0i 16SW57    W84  C~4ybt      
2017 12  08.04071  02 41 51.547  +03 00 58.60  22.3i 16SW57    W84  C~4ybt      
2017 12  08.04484  02 41 51.540  +03 00 58.67  23.4r 16SW57    W84  C~4ybt      
2017 12  10.10599  02 41 44.215  +03 00 48.73  23.8r 16SW57    W84  C~4ybt      
2018 01  05.05704  02 40 35.099  +03 01 49.83  24.5g 16SW57    W84  C~4ybt      
2018 11  16.14680  02 47 46.930  +03 34 50.06  23.2i 16SW57    W84  C~4ybt      
2018 12  01.16418  02 46 43.454  +03 31 46.23  23.1r 16SW57    W84  C~4ybt      

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     0.03       0.00    -0.06
     2   0.0410      0.00     0.08       0.00    -0.18
     3   0.0629      0.00    -0.11       0.00    -0.01
     4   0.1147      0.00    -0.06       0.00     0.07
     5   0.9502      0.00     0.07       0.00    -0.11
     6   1.1878      0.00     0.17       0.00     0.12
     7   2.8395      0.00    -0.02       0.00    -0.06
     8   2.8864      0.00    -0.03       0.00     0.07
     9   2.8867      0.00    -0.07       0.00     0.12
    10   2.8892      0.00     0.02       0.00     0.06
    11   2.8893      0.00    -0.06       0.00     0.14
    12   2.8919      0.00    -0.00       0.00     0.14
    13   2.8921      0.00    -0.08       0.00     0.10
    14   2.8923      0.00     0.01       0.00     0.20
    15   3.1181      0.00    -0.11       0.00    -0.14
    16   3.9754      0.00     0.22       0.00    -0.03
    17   3.9807      0.00    -0.05       0.00    -0.05
    18   4.0408      0.00    -0.12       0.00    -0.16
    19   4.0816      0.00    -0.01       0.00    -0.10
    20   4.0816      0.00     0.12       0.00    -0.01
    21   4.0873      0.00     0.01       0.00    -0.04
    22   4.1583      0.00     0.02       0.00     0.01
    23   5.0210      0.00     0.02       0.00    -0.03
    24   5.0621      0.00     0.07       0.00     0.01

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.

16SW57    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        46.689    46.689    46.689
ecceobj         0.175     0.175     0.175
incobj         13.533    13.533    13.533
qmin           37.270    37.241    37.257
qmax           55.764    55.897    55.863
amean          46.336    46.326    46.328
amin           45.930    45.916    45.916
amax           46.801    46.802    46.803
emean           0.180     0.180     0.180
emin            0.166     0.166     0.166
emax            0.193     0.195     0.194
imean          11.895    11.891    11.904
imin           11.333    11.344    11.344
imax           12.511    12.501    12.511
excite_mean     0.274     0.273     0.274
fracstop        1.000     1.000     1.000
cjmean          3.038     3.038     3.038

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       173.7     173.9     173.1
kozaiamp        180.0     179.9     179.9