Orbit Fit and Astrometric record for 15KG172

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: 15KG172   
# Created Wed Feb 20 02:10:33 2019
# 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:
  -0.000005   0.009568   0.000001  -0.006008   0.015796   0.000000
# Chi-squared of fit:     2.03 DOF:   10 RMS:  0.09
# Min/Max residuals:    -0.16    0.11
# Exact a, adot, b, bdot, g, gdot:
  9.250409E-06  9.616901E-03 -5.390150E-06 -6.043702E-03  1.596251E-02  1.956034E-03
# Covariance matrix:
  6.7388E-13  7.7124E-12  2.6817E-14 -4.9065E-12  1.1437E-11  2.7644E-10
  7.7124E-12  2.0372E-10  6.9387E-13 -1.2722E-10  2.9306E-10  7.1676E-09
  2.6817E-14  6.9387E-13  3.7058E-13 -5.5896E-13  1.0029E-12  2.4439E-11
 -4.9065E-12 -1.2722E-10 -5.5896E-13  7.9587E-11 -1.8348E-10 -4.4792E-09
  1.1437E-11  2.9306E-10  1.0029E-12 -1.8348E-10  4.2791E-10  1.0338E-08
  2.7644E-10  7.1676E-09  2.4439E-11 -4.4792E-09  1.0338E-08  2.5237E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.536920 -132.569741   -0.197468    0.061250   -0.988782  2457162.568488
# Heliocentric elements and errors
Epoch:              2457160.5000  =  2015/05/18
Mean Anomaly:          122.18404 +/-     7.316
Argument of Peri:       32.02061 +/-     6.702
Long of Asc Node:       53.12708 +/-     0.000
Inclination:            32.30955 +/-     0.002
Eccentricity:         0.23407316 +/-    0.0230
Semi-Major Axis:     55.00108287 +/-    0.4942
Time of Perihelion: 2406593.4899 +/-    2950.1
Perihelion:          42.12680545 +/-    1.3218
Aphelion:            67.87536028 +/-    1.4057
Period (y)              407.9107 +/-      5.50
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.82668038 +/-    0.0548
Ecliptic Y          -46.91214327 +/-    0.0597
Ecliptic Z            3.86446562 +/-    0.0050
Ecliptic XDOT         0.00094216 +/-    0.0001
Ecliptic YDOT        -0.00141568 +/-    0.0001
Ecliptic ZDOT        -0.00101386 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   63.63810048 +/-    0.0574
Geocenter to KBO     62.64678142 +/-    0.0812
# Hcoef:  6.06

The following table shows the complete astrometric record for 15KG172. 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 (15KG172) followed by the observatory code and reference code for the source of the astrometry.

2015 05  20.06771  15 03 57.52   -13 38 16.6         15KG172   W84  C~2fCG      
2015 05  21.07556  15 03 54.15   -13 38 06.6   23.9r 15KG172   W84  C~2fCG      
2015 05  22.15470  15 03 50.56   -13 37 56.1         15KG172   W84  C~2fCG      
2015 05  24.06788  15 03 44.22   -13 37 37.8         15KG172   W84  C~2fCG      
2018 04  12.16494  15 11 24.425  -15 11 25.40  24.0r 15KG172   807  C~2fCG      
2018 04  13.16054  15 11 21.444  -15 11 15.80  23.9r 15KG172   807  C~2fCG      
2018 05  16.32178  15 09 32.159  -15 05 35.30  23.8r 15KG172   304  C~2fCG      
2018 05  17.33766  15 09 28.699  -15 05 25.25  24.0r 15KG172   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     0.06       0.00    -0.12
  2   0.0028    -49.97     0.01      -4.00    -0.01
  3   0.0057   -103.17     0.09      -8.40     0.06
  4   0.0110   -197.04    -0.16     -16.42     0.07
  5   2.8969   7776.21     0.10   -3605.50     0.11
  6   2.8996   7732.00    -0.12   -3607.86     0.04
  7   2.9904   6114.42     0.07   -3707.07     0.00
  8   2.9932   6063.41    -0.05   -3710.97    -0.14

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.

15KG172    quality flag:2

Type:       SCATNEAR  SCATNEAR  SCATEXTD

axisobj        54.545    56.554    53.797
ecceobj         0.238     0.309     0.195
incobj         32.460    32.463    32.458
qmin           40.847    38.623    42.625
qmax           69.510    75.983    66.138
amean          54.910    56.930    54.138
amin           54.399    56.366    53.656
amax           55.499    57.639    54.697
emean           0.238     0.308     0.195
emin            0.223     0.299     0.182
emax            0.253     0.319     0.210
imean          31.317    31.371    31.298
imin           31.012    31.125    31.073
imax           31.658    31.599    31.573
excite_mean     0.572     0.605     0.555
fracstop        1.000     1.000     1.000
cjmean          2.790     2.763     2.804

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     204.2     164.5
kozaiamp        180.0     155.8     179.9