Orbit Fit and Astrometric record for 13SW112

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: 13SW112   
# Created Tue Apr  1 01:09:43 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     16 observations of     16
# Arc:   5.10y
# First observation: 2013/09/30
#  Last observation: 2018/11/07
# Chi-squared of fit:     3.39 DOF:     26 RMS:  0.08
# Min/Max residuals:    -0.14    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.607221E-05  2.337262E-02 -6.475381E-08  1.239711E-04  2.402940E-02  1.996479E-03
# Covariance matrix:
  2.6208E-13 -3.8658E-14  4.2941E-16  8.7349E-17  2.3786E-13  2.2635E-13
 -3.8658E-14  5.3765E-13  4.2642E-17  2.6769E-15  2.8755E-13  5.1704E-12
  4.2941E-16  4.2642E-17  1.8292E-13 -4.4363E-14  1.2965E-15  1.3449E-15
  8.7349E-17  2.6769E-15 -4.4363E-14  2.1857E-14  1.6637E-15  2.6957E-14
  2.3786E-13  2.8755E-13  1.2965E-15  1.6637E-15  8.5664E-13  3.3843E-12
  2.2635E-13  5.1704E-12  1.3449E-15  2.6957E-14  3.3843E-12  5.2190E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.631313    1.140512   -0.098690    0.011080   -0.996707  2456565.633408
# Heliocentric elements and errors
Epoch:              2456566.5000  =  2013/10/01
Mean Anomaly:           67.30817 +/-     0.055
Argument of Peri:      346.28928 +/-     0.084
Long of Asc Node:      297.84750 +/-     0.028
Inclination:             0.68932 +/-     0.000
Eccentricity:         0.08948257 +/-    0.0003
Semi-Major Axis:     43.81146920 +/-    0.0065
Time of Perihelion: 2436762.8398 +/-      16.7
Perihelion:          39.89110616 +/-    0.0147
Aphelion:            47.73183224 +/-    0.0152
Period (y)              289.9946 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.59909014 +/-    0.0016
Ecliptic Y            0.94990848 +/-    0.0000
Ecliptic Z            0.45851253 +/-    0.0000
Ecliptic XDOT         0.00016808 +/-    0.0000
Ecliptic YDOT         0.00266569 +/-    0.0000
Ecliptic ZDOT         0.00001677 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.61209209 +/-    0.0016
Geocenter to KBO     41.61566569 +/-    0.0016
# Hcoef:  7.23

The following table shows the complete astrometric record for 13SW112. 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 (13SW112) followed by the observatory code and reference code for the source of the astrometry.

2013 09  30.13263  00 03 10.873  +01 01 58.35  22.9r 13SW112   W84  C~52RV      
2013 09  30.13409  00 03 10.877  +01 01 58.41  23.1i 13SW112   W84  C~52RV      
2013 10  11.11811  00 02 23.876  +00 56 51.23  23.1z 13SW112   W84  C~52RV      
2013 10  13.10922  00 02 15.659  +00 55 57.42  23.0i 13SW112   W84  C~52RV      
2013 10  28.07069  00 01 18.636  +00 49 40.70  23.4r 13SW112   W84  C~52RV      
2013 10  28.07351  00 01 18.605  +00 49 40.63  23.7i 13SW112   W84  C~52RV      
2013 11  22.06260  00 00 11.468  +00 42 07.19  24.3r 13SW112   W84  C~52RV      
2013 11  23.08855  00 00 09.674  +00 41 54.74  23.4r 13SW112   W84  C~52RV      
2015 11  07.07175  00 10 30.254  +01 50 14.61  23.8r 13SW112   W84  C~52RV      
2017 08  22.31634  00 25 13.393  +03 26 15.02  22.9i 13SW112   W84  C~52RV      
2017 08  28.26891  00 24 52.868  +03 24 06.41  23.7r 13SW112   W84  C~52RV      
2017 09  27.17455  00 22 50.343  +03 11 06.57  23.2z 13SW112   W84  C~52RV      
2017 10  22.17055  00 21 03.998  +02 59 36.28  23.6r 13SW112   W84  C~52RV      
2017 10  22.17193  00 21 03.993  +02 59 36.27  23.5i 13SW112   W84  C~52RV      
2018 09  09.32722  00 28 56.319  +03 50 40.24  23.3i 13SW112   W84  C~52RV      
2018 11  07.13052  00 24 55.141  +03 24 42.16  23.2r 13SW112   W84  C~52RV      

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    -0.14       0.00    -0.03
     2   0.0000      0.00     0.01       0.00     0.07
     3   0.0301      0.00    -0.06       0.00    -0.06
     4   0.0355      0.00    -0.02       0.00     0.07
     5   0.0765      0.00     0.21       0.00     0.09
     6   0.0765      0.00    -0.11       0.00     0.08
     7   0.1449      0.00     0.04       0.00    -0.13
     8   0.1477      0.00     0.06       0.00    -0.09
     9   2.1025      0.00     0.10       0.00    -0.07
    10   3.8937      0.00     0.04       0.00     0.18
    11   3.9100      0.00    -0.08       0.00    -0.01
    12   3.9919      0.00    -0.00       0.00     0.01
    13   4.0603      0.00    -0.02       0.00    -0.02
    14   4.0603      0.00    -0.01       0.00     0.01
    15   4.9424      0.00     0.06       0.00     0.01
    16   5.1033      0.00    -0.02       0.00    -0.08

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.

13SW112    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.069    44.069    44.069
ecceobj         0.093     0.093     0.093
incobj          0.689     0.689     0.689
qmin           39.192    39.227    39.226
qmax           48.860    48.814    48.792
amean          43.866    43.867    43.867
amin           43.513    43.501    43.513
amax           44.270    44.254    44.254
emean           0.085     0.085     0.085
emin            0.066     0.066     0.067
emax            0.104     0.104     0.103
imean           2.644     2.644     2.646
imin            1.811     1.811     1.813
imax            3.417     3.416     3.417
excite_mean     0.097     0.097     0.097
fracstop        1.000     1.000     1.000
cjmean          3.089     3.089     3.089

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       183.4     182.9     183.0
kozaiamp        179.9     179.9     180.0