Orbit Fit and Astrometric record for 15KH172

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: 15KH172   
# Created Fri Dec  3 02:13:21 2021
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:   1.13y
# First observation: 2015/05/21
#  Last observation: 2016/07/05
Preliminary a, adot, b, bdot, g, gdot:
   0.001120   0.514181   0.001135  -0.046008   0.179911   0.000000
# Chi-squared of fit:     8.24 DOF:     26 RMS:  0.13
# Min/Max residuals:    -0.24    0.35
# Exact a, adot, b, bdot, g, gdot:
  3.999661E-05  3.921895E-01 -3.302744E-06 -3.532590E-02  1.554108E-01 -2.128026E-01
# Covariance matrix:
  2.0692E-13 -8.4714E-13 -3.4020E-15  5.9475E-14 -2.6853E-14 -1.1974E-12
 -8.4714E-13  1.9543E-10  1.5214E-12 -1.8806E-11  3.8099E-11  3.7573E-10
 -3.4020E-15  1.5214E-12  1.9547E-13 -3.4137E-13  3.0509E-13  2.9347E-12
  5.9475E-14 -1.8806E-11 -3.4137E-13  2.1441E-12 -3.6888E-12 -3.6227E-11
 -2.6853E-14  3.8099E-11  3.0509E-13 -3.6888E-12  7.9160E-12  7.3654E-11
 -1.1974E-12  3.7573E-10  2.9347E-12 -3.6227E-11  7.3654E-11  7.2375E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.122454 -123.973134   -0.068900    0.142530   -0.997989  2457163.847978
# Heliocentric elements and errors
Epoch:              2457160.5000  =  2015/05/18
Mean Anomaly:          347.58254 +/-     0.004
Argument of Peri:      200.08780 +/-     0.005
Long of Asc Node:      106.92984 +/-     0.000
Inclination:             9.08514 +/-     0.000
Eccentricity:         0.68091473 +/-    0.0001
Semi-Major Axis:     16.96384607 +/-    0.0035
Time of Perihelion: 2458040.7683 +/-       0.0
Perihelion:           5.41291341 +/-    0.0018
Aphelion:            28.51477873 +/-    0.0061
Period (y)               69.8706 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -4.06889994 +/-    0.0001
Ecliptic Y           -6.15727215 +/-    0.0001
Ecliptic Z            0.90916709 +/-    0.0000
Ecliptic XDOT         0.00775172 +/-    0.0000
Ecliptic YDOT        -0.00086214 +/-    0.0000
Ecliptic ZDOT        -0.00114570 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.43602930 +/-    0.0001
Geocenter to KBO      6.43455988 +/-    0.0001
# Hcoef: 14.91

The following table shows the complete astrometric record for 15KH172. 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 (15KH172) followed by the observatory code and reference code for the source of the astrometry.

2015 05  21.34720  15 42 35.970  -11 21 28.43  23.6r 15KH172   568  C~2ji8      
2015 05  21.38827  15 42 35.052  -11 21 26.34  23.5r 15KH172   568  C~2ji8      
2015 05  21.42959  15 42 34.132  -11 21 24.26  23.6r 15KH172   568  C~2ji8      
2015 05  22.50587  15 42 10.702  -11 20 31.69  23.5r 15KH172   568  C~2ji8      
2015 05  25.49257  15 41 05.957  -11 18 13.99  23.8r 15KH172   568  C~2ji8      
2015 06  20.39803  15 32 41.422  -11 08 53.34  23.5r 15KH172   568  C~2ji8      
2015 06  23.41822  15 31 54.567  -11 09 15.44  23.5r 15KH172   568  C~2ji8      
2015 07  11.28721  15 28 35.308  -11 18 25.94  23.7r 15KH172   568  C~2ji8      
2015 07  18.35664  15 27 57.992  -11 25 23.72  23.6r 15KH172   568  C~2ji8      
2016 04  03.61583  17 39 52.770  -18 26 19.56  21.0w 15KH172   568  C~2ji8      
2016 04  30.53159  17 39 29.813  -18 25 25.19  22.4w 15KH172   568  C~2ji8      
2016 04  30.59933  17 39 29.143  -18 25 25.25  21.2w 15KH172   568  C~2ji8      
2016 05  03.50240  17 39 00.062  -18 25 30.14  22.7w 15KH172   568  C~2ji8      
2016 05  07.56770  17 38 11.163  -18 25 42.53  24.1w 15KH172   568  C~2ji8      
2016 05  07.57303  17 38 11.086  -18 25 42.49  27.3w 15KH172   568  C~2ji8      
2016 07  05.41922  17 17 09.750  -18 47 38.42  22.7w 15KH172   568  C~2ji8      

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    -0.02       0.00    -0.06
     2   0.0001    -13.62    -0.09      -1.03    -0.00
     3   0.0002    -27.27    -0.08      -2.07     0.04
     4   0.0032   -374.79     0.01     -29.06     0.02
     5   0.0113  -1333.43    -0.06    -111.63    -0.01
     6   0.0823  -8690.05    -0.01   -1285.18     0.05
     7   0.0905  -9356.37    -0.04   -1469.16    -0.04
     8   0.1395 -12081.89     0.17   -2701.27     0.04
     9   0.1588 -12516.89     0.14   -3239.21    -0.02
    10   0.8714 114756.38    -0.18   -8987.26     0.19
    11   0.9451 114323.56     0.22   -8956.26    -0.06
    12   0.9452 114311.16     0.15   -8957.24    -0.06
    13   0.9532 113774.03     0.35   -9002.44    -0.18
    14   0.9643 112874.19    -0.16   -9083.67    -0.06
    15   0.9643 112872.76    -0.24   -9083.73     0.00
    16   1.1255  90891.42    -0.15  -12466.17     0.16

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.

15KH172    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        16.714    16.722    16.706
ecceobj         0.679     0.679     0.679
incobj          9.064     9.064     9.064
qmin            5.366     5.372     5.362
qmax           33.805    29.668    29.323
amean          18.249    17.121    17.044
amin           16.714    16.722    16.706
amax           19.586    17.520    17.383
emean           0.704     0.686     0.683
emin            0.679     0.679     0.679
emax            0.726     0.693     0.687
imean           7.393     7.379     7.389
imin            7.257     7.273     7.294
imax            7.485     7.485     7.485
excite_mean     0.716     0.698     0.695
fracstop        0.000     0.000     0.000
cjmean          2.749     2.845     2.855

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       204.3     202.2     201.7
kozaiamp          3.4       2.0       1.4