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 Nov 22 02:10:22 2024
# 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:
3.999660E-05 3.921895E-01 -3.302743E-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 3.927 5.372 5.309 qmax 31.468 29.660 29.323 amean 12.706 17.119 14.317 amin 6.628 16.722 10.791 amax 18.431 17.516 17.383 emean 0.576 0.686 0.607 emin 0.355 0.679 0.505 emax 0.707 0.693 0.687 imean 6.946 7.380 7.967 imin 5.218 7.274 7.293 imax 8.053 7.485 9.108 excite_mean 0.589 0.698 0.623 fracstop 0.001 0.000 0.000 cjmean 3.708 2.845 3.259 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 200.5 202.2 213.9 kozaiamp 113.0 2.0 15.2