Orbit Fit and Astrometric record for 15KF172

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: 15KF172   
# Created Wed Dec  8 02:13:23 2021
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.99y
# First observation: 2015/05/20
#  Last observation: 2018/05/17
Preliminary a, adot, b, bdot, g, gdot:
   0.000003   0.011425   0.000001  -0.002102   0.015869   0.000000
# Chi-squared of fit:    11.76 DOF:     10 RMS:  0.21
# Min/Max residuals:    -0.57    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.244735E-05  1.123652E-02 -1.791668E-06 -2.069619E-03  1.578199E-02 -5.279313E-03
# Covariance matrix:
  9.1971E-13  1.5384E-11  3.2651E-15 -2.8309E-12  1.8594E-11  4.5740E-10
  1.5384E-11  4.4026E-10  9.5618E-14 -8.0244E-11  5.2299E-10  1.2967E-08
  3.2651E-15  9.5618E-14  3.6835E-13 -1.4261E-13  1.1007E-13  2.8055E-12
 -2.8309E-12 -8.0244E-11 -1.4261E-13  1.4714E-11 -9.5460E-11 -2.3641E-09
  1.8594E-11  5.2299E-10  1.1007E-13 -9.5460E-11  6.2706E-10  1.5424E-08
  4.5740E-10  1.2967E-08  2.8055E-12 -2.3641E-09  1.5424E-08  3.8202E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -6.303975 -130.439033   -0.159961   -0.109383   -0.991392  2457162.536808
# Heliocentric elements and errors
Epoch:              2457160.5000  =  2015/05/18
Mean Anomaly:          298.67681 +/-     5.614
Argument of Peri:      321.24956 +/-     2.358
Long of Asc Node:       19.03767 +/-     0.017
Inclination:            12.03646 +/-     0.005
Eccentricity:         0.41607810 +/-    0.0442
Semi-Major Axis:     66.74325765 +/-    3.1575
Time of Perihelion: 2491086.4330 +/-    1962.4
Perihelion:          38.97285007 +/-    3.4816
Aphelion:            94.51366523 +/-    5.3586
Period (y)              545.2797 +/-     38.69
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.37933020 +/-    0.0649
Ecliptic Y          -48.79736176 +/-    0.0760
Ecliptic Z           -6.95760454 +/-    0.0110
Ecliptic XDOT         0.00209684 +/-    0.0001
Ecliptic YDOT        -0.00054769 +/-    0.0001
Ecliptic ZDOT        -0.00025623 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   64.35712660 +/-    0.0712
Geocenter to KBO     63.36336916 +/-    0.1005
# Hcoef:  5.51

The following table shows the complete astrometric record for 15KF172. 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 (15KF172) followed by the observatory code and reference code for the source of the astrometry.

2015 05  20.03603  15 01 00.27   -23 40 54.9         15KF172   W84  C~2fCG      
2015 05  21.04367  15 00 56.88   -23 40 41.4   23.1r 15KF172   W84  C~2fCG      
2015 05  23.03685  15 00 50.19   -23 40 14.6         15KF172   W84  C~2fCG      
2015 05  24.03515  15 00 46.86   -23 40 01.0         15KF172   W84  C~2fCG      
2018 04  12.15925  15 11 00.118  -24 40 46.36  23.5r 15KF172   807  C~2fCG      
2018 04  13.15531  15 10 57.061  -24 40 39.75  23.7r 15KF172   807  C~2fCG      
2018 05  16.32511  15 09 03.967  -24 34 58.31  23.3r 15KF172   304  C~2fCG      
2018 05  17.34178  15 09 00.396  -24 34 45.40  23.6r 15KF172   304  C~2fCG      

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    -0.25       0.00    -0.06
     2   0.0028    -48.49    -0.00      -0.17     0.02
     3   0.0082   -144.22     0.13      -0.37    -0.01
     4   0.0109   -191.94     0.12      -0.22     0.07
     5   2.8970   8882.52    -0.02   -1212.93    -0.19
     6   2.8997   8840.51     0.07   -1217.58    -0.57
     7   2.9905   7260.77    -0.05   -1298.96     0.37
     8   2.9933   7210.32     0.01   -1299.57     0.36

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.

15KF172    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        66.317    78.821    59.504
ecceobj         0.421     0.550     0.300
incobj         12.114    12.099    12.129
qmin           37.867    34.626    41.287
qmax           97.255   128.791    79.494
amean          66.864    79.758    59.938
amin           66.035    78.160    59.307
amax           68.012    82.283    60.720
emean           0.420     0.552     0.298
emin            0.409     0.539     0.287
emax            0.432     0.569     0.310
imean          11.882    11.559    11.932
imin           11.342    10.367    11.651
imax           12.409    12.534    12.247
excite_mean     0.468     0.588     0.362
fracstop        1.000     1.000     1.000
cjmean          3.097     3.035     3.138

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       164.3     176.2     163.9
kozaiamp        180.0     180.0     180.0