Orbit Fit and Astrometric record for 13ST112

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: 13ST112   
# Created Tue Apr  1 01:09:43 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     15 observations of     15
# Arc:   5.11y
# First observation: 2013/09/30
#  Last observation: 2018/11/08
# Chi-squared of fit:     8.56 DOF:     24 RMS:  0.13
# Min/Max residuals:    -0.39    0.16
# Exact a, adot, b, bdot, g, gdot:
  1.548598E-05  2.443919E-02  1.133464E-06  1.584794E-03  2.459682E-02  7.332092E-05
# Covariance matrix:
  3.4461E-13 -3.3859E-13  5.7324E-15 -1.8466E-14  2.2122E-13 -2.5720E-12
 -3.3859E-13  1.1773E-12 -2.3610E-14  7.8173E-14 -7.0357E-13  1.0867E-11
  5.7324E-15 -2.3610E-14  2.7719E-13 -6.8102E-14  1.6790E-14 -2.2289E-13
 -1.8466E-14  7.8173E-14 -6.8102E-14  3.0018E-14 -4.7896E-14  7.3708E-13
  2.2122E-13 -7.0357E-13  1.6790E-14 -4.7896E-14  1.2551E-12 -6.7315E-12
 -2.5720E-12  1.0867E-11 -2.2289E-13  7.3708E-13 -6.7315E-12  1.0247E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.654678   -1.896632   -0.151338    0.045957   -0.989077  2456565.631898
# Heliocentric elements and errors
Epoch:              2456566.5000  =  2013/10/01
Mean Anomaly:            5.35032 +/-     0.481
Argument of Peri:       29.10677 +/-     0.527
Long of Asc Node:      323.43840 +/-     0.003
Inclination:             4.52587 +/-     0.000
Eccentricity:         0.04487326 +/-    0.0002
Semi-Major Axis:     43.59132112 +/-    0.0114
Time of Perihelion: 2455004.1591 +/-     140.4
Perihelion:          41.63523636 +/-    0.0152
Aphelion:            45.54740588 +/-    0.0160
Period (y)              287.8116 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.58400359 +/-    0.0018
Ecliptic Y           -1.22255364 +/-    0.0001
Ecliptic Z            1.88304832 +/-    0.0001
Ecliptic XDOT         0.00008385 +/-    0.0000
Ecliptic YDOT         0.00271749 +/-    0.0000
Ecliptic ZDOT         0.00017673 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.64456303 +/-    0.0018
Geocenter to KBO     40.65570631 +/-    0.0019
# Hcoef:  7.07

The following table shows the complete astrometric record for 13ST112. 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 (13ST112) followed by the observatory code and reference code for the source of the astrometry.

2013 09  30.13112  23 48 48.997  +01 40 53.40  23.4r 13ST112   W84  C~52RV      
2013 09  30.13557  23 48 48.972  +01 40 53.36  23.1i 13ST112   W84  C~52RV      
2013 10  11.11950  23 48 01.808  +01 35 44.86  23.1z 13ST112   W84  C~52RV      
2013 10  28.04236  23 46 57.969  +01 28 30.27  23.5r 13ST112   W84  C~52RV      
2013 10  28.04375  23 46 57.945  +01 28 29.68  22.7i 13ST112   W84  C~52RV      
2016 08  26.20924  00 06 17.430  +03 50 47.12  23.4r 13ST112   W84  C~52RV      
2016 08  26.21062  00 06 17.424  +03 50 46.91  24.1g 13ST112   W84  C~52RV      
2016 09  22.12861  00 04 22.435  +03 39 19.19  23.2r 13ST112   W84  C~52RV      
2017 09  27.16906  00 09 00.724  +04 15 03.65  23.3z 13ST112   W84  C~52RV      
2017 09  27.17868  00 09 00.683  +04 15 03.37  23.2r 13ST112   W84  C~52RV      
2017 09  27.18004  00 09 00.676  +04 15 03.28  22.8i 13ST112   W84  C~52RV      
2017 10  26.06409  00 06 58.111  +04 01 34.99  22.5z 13ST112   W84  C~52RV      
2018 10  18.15718  00 12 30.055  +04 43 06.19  22.2z 13ST112   W84  C~52RV      
2018 10  28.17383  00 11 50.450  +04 38 35.94  23.0i 13ST112   W84  C~52RV      
2018 11  08.13461  00 11 12.901  +04 34 09.07  23.3r 13ST112   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     0.05       0.00    -0.00
     2   0.0000      0.00    -0.02       0.00     0.08
     3   0.0301      0.00     0.08       0.00     0.09
     4   0.0764      0.00     0.12       0.00     0.16
     5   0.0764      0.00    -0.17       0.00    -0.39
     6   2.9051      0.00    -0.08       0.00     0.07
     7   2.9051      0.00    -0.09       0.00    -0.11
     8   2.9788      0.00    -0.04       0.00     0.14
     9   3.9919      0.00     0.05       0.00     0.08
    10   3.9919      0.00     0.10       0.00     0.07
    11   3.9919      0.00     0.09       0.00     0.02
    12   4.0710      0.00     0.03       0.00    -0.09
    13   5.0487      0.00     0.08       0.00     0.13
    14   5.0761      0.00    -0.28       0.00    -0.21
    15   5.1061      0.00     0.15       0.00    -0.02

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.

13ST112    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.843    43.843    43.843
ecceobj         0.051     0.051     0.051
incobj          4.514     4.514     4.514
qmin           40.787    40.786    40.787
qmax           46.693    46.692    46.693
amean          43.644    43.644    43.644
amin           43.311    43.312    43.313
amax           43.995    43.996    43.995
emean           0.045     0.045     0.045
emin            0.028     0.028     0.028
emax            0.062     0.062     0.062
imean           5.660     5.660     5.660
imin            4.923     4.922     4.923
imax            6.323     6.323     6.322
excite_mean     0.109     0.109     0.109
fracstop        1.000     1.000     1.000
cjmean          3.083     3.083     3.083

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       176.7     176.7     176.7
kozaiamp        180.0     180.0     180.0