Orbit Fit and Astrometric record for 15HT171

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: 15HT171   
# Created Sun Oct 22 01:38:35 2017
# Orbit generated from Bernstein formalism
# Fitting   47 observations of   49
# Arc:   2.27y
# First observation: 2014/03/27
#  Last observation: 2016/07/01
Preliminary a, adot, b, bdot, g, gdot:
   0.000476   0.355364   0.000070  -0.134209   0.192968   0.000000
# Chi-squared of fit:   111.15 DOF:   88 RMS:  0.27
# Min/Max residuals:    -0.91    0.67
# Exact a, adot, b, bdot, g, gdot:
  3.766092E-05  3.129921E-01 -1.419277E-05 -1.324300E-01  1.366464E-01 -1.650246E-02
# Covariance matrix:
  5.3217E-14 -6.1641E-14 -1.8513E-15  1.4401E-14 -6.0087E-15 -4.9257E-14
 -6.1641E-14  5.0357E-13  2.0876E-14 -1.6030E-13  3.0359E-13  5.8011E-13
 -1.8513E-15  2.0876E-14  5.1211E-14 -4.1075E-14  8.4879E-15  3.1256E-14
  1.4401E-14 -1.6030E-13 -4.1075E-14  1.1841E-13 -6.3135E-14 -2.4172E-13
 -6.0087E-15  3.0359E-13  8.4879E-15 -6.3135E-14  3.5375E-13  2.5997E-13
 -4.9257E-14  5.8011E-13  3.1256E-14 -2.4172E-13  2.5997E-13  8.4820E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   28.379132 -165.719866    0.133468    0.469499   -0.868929  2456743.915648
# Heliocentric elements and errors
Epoch:              2456740.5000  =  2014/03/24
Mean Anomaly:          354.50433 +/-     0.000
Argument of Peri:      139.70335 +/-     0.001
Long of Asc Node:       58.72460 +/-     0.000
Inclination:            33.28854 +/-     0.000
Eccentricity:         0.29180693 +/-    0.0000
Semi-Major Axis:     11.54027792 +/-    0.0003
Time of Perihelion: 2456959.0952 +/-       0.0
Perihelion:           8.17274479 +/-    0.0002
Aphelion:            14.90781104 +/-    0.0004
Period (y)               39.2042 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -7.23125581 +/-    0.0000
Ecliptic Y           -1.70069774 +/-    0.0000
Ecliptic Z            3.47829136 +/-    0.0000
Ecliptic XDOT         0.00060100 +/-    0.0000
Ecliptic YDOT        -0.00631986 +/-    0.0000
Ecliptic ZDOT        -0.00249152 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    8.20255718 +/-    0.0000
Geocenter to KBO      7.31815800 +/-    0.0000
# Hcoef: 12.21

The following table shows the complete astrometric record for 15HT171. 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 (15HT171) followed by the observatory code and reference code for the source of the astrometry.

2014 03  27.41487  13 37 54.76   +20 28 20.9   20.9V 15HT171   G96  C~12hA      
2014 03  27.41995  13 37 54.68   +20 28 21.6   21.1V 15HT171   G96  C~12hA      
2014 03  27.42503  13 37 54.57   +20 28 21.4   20.8V 15HT171   G96  C~12hA      
2014 03  27.43012  13 37 54.49   +20 28 22.5   20.8V 15HT171   G96  C~12hA      
2014 03  27.48091  13 37 53.40   +20 28 26.9   21.1V 15HT171   G96  C~12hA      
2014 03  27.48353  13 37 53.30   +20 28 27.3   20.9V 15HT171   G96  C~12hA      
2014 03  27.48614  13 37 53.27   +20 28 27.2   20.5V 15HT171   G96  C~12hA      
2014 03  27.48875  13 37 53.21   +20 28 27.7   20.8V 15HT171   G96  C~12hA      
2014 03  28.29814  13 37 36.36   +20 29 38.5   21.6R 15HT171   926  C~12hA      
2014 03  28.32115  13 37 35.85   +20 29 40.4   22.2R 15HT171   926  C~12hA      
2014 03  28.34433  13 37 35.39   +20 29 42.3   22.0R 15HT171   926  C~12hA      
2014 03  28.44190  13 37 33.24   +20 29 50.5         15HT171   G96  C~12hA      
2014 03  28.44769  13 37 33.14   +20 29 50.7         15HT171   G96  C~12hA      
2014 03  28.45058  13 37 33.06   +20 29 51.2         15HT171   G96  C~12hA      
2014 03  29.43315  13 37 12.24   +20 31 13.9   22.2V 15HT171   G96  C~12hA      
2014 03  29.43794  13 37 12.19   +20 31 13.7   21.1V 15HT171   G96  C~12hA      
2014 03  29.44274  13 37 12.07   +20 31 14.3   21.4V 15HT171   G96  C~12hA      
2014 03  29.44754  13 37 11.95   +20 31 14.7   21.2V 15HT171   G96  C~12hA      
2014 03  30.33724  13 36 53.02   +20 32 26.5   21.1V 15HT171   G96  C~12hA      
2014 03  30.34260  13 36 52.92   +20 32 26.9   20.9V 15HT171   G96  C~12hA      
2014 03  30.34798  13 36 52.80   +20 32 27.3   21.1V 15HT171   G96  C~12hA      
2014 03  30.35335  13 36 52.69   +20 32 27.9   21.0V 15HT171   G96  C~12hA      
2014 03  30.374136 13 36 52.21   +20 32 29.3   21.2V 15HT171   V37  C~12hA      
2014 03  30.377495 13 36 52.14   +20 32 29.3   21.9V 15HT171   V37  C~12hA      
2014 03  30.442653 13 36 50.70   +20 32 34.2   21.7V 15HT171   V37  C~12hA      
2014 03  30.446010 13 36 50.65   +20 32 34.6   21.8V 15HT171   V37  C~12hA      
2014 03  30.449359 13 36 50.57   +20 32 35.1   22.1V 15HT171   V37  C~12hA      
2015 04  23.49565  14 22 08.345  +06 07 15.42  21.7w 15HT171   F51  C~1RNE      
2015 04  23.50990  14 22 08.030  +06 07 15.70  21.4w 15HT171   F51  C~1RNE      
2015 04  23.52409  14 22 07.701  +06 07 16.22  21.6w 15HT171   F51  C~1RNE      
2015 04  23.53834  14 22 07.382  +06 07 16.31  21.6w 15HT171   F51  C~1RNE      
2015 04  27.18200  14 20 46.23   +06 08 02.2   21.2R 15HT171   291  C~1RNE      
2015 04  27.19931  14 20 45.86   +06 08 02.5   21.1R 15HT171   291  C~1RNE      
2015 04  27.21666  14 20 45.41   +06 08 02.1   20.8R 15HT171   291  C~1RNE      
2015 04  29.19403  14 20 01.41   +06 08 08.6         15HT171   291  C~1RNE      
2015 04  29.20995  14 20 01.03   +06 08 10.2   20.8R 15HT171   291  C~1RNE      
2015 04  29.22587  14 20 00.62   +06 08 10.1   21.0R 15HT171   291  C~1RNE      
2015 05  01.39184  14 19 12.36   +06 08 06.2   21.0R 15HT171   291  C~1RNE      
2015 05  01.40904  14 19 11.97   +06 08 05.8   21.1R 15HT171   291  C~1RNE      
2015 05  01.42620  14 19 11.61   +06 08 06.3   21.7R 15HT171   291  C~1RNE      
2015 05  18.42646  14 13 09.674  +05 58 58.10  21.2w 15HT171   F51  C~1SMx      
2015 05  18.43881  14 13 09.421  +05 58 57.35  21.2w 15HT171   F51  C~1SMx      
2015 05  18.45110  14 13 09.166  +05 58 56.52  21.3w 15HT171   F51  C~1SMx      
2015 05  18.46340  14 13 08.912  +05 58 55.78  21.3w 15HT171   F51  C~1SMx      
2016 03  13.42196  15 23 09.24   -08 35 30.0   21.0R 15HT171   G37  C~1pQv      
2016 03  13.51246  15 23 08.62   -08 35 30.4         15HT171   G37  C~1pQv      
2016 07  01.96321  14 51 22.99   -09 22 05.1   21.5R 15HT171   J04  C~1v0d      
2016 07  01.97423  14 51 22.88   -09 22 06.2   22.0R 15HT171   J04  C~1v0d      
2016 07  01.98525  14 51 22.75   -09 22 07.0   21.4R 15HT171   J04  C~1v0d      

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    -0.30       0.00    -0.23
  2   0.0000     -1.31    -0.04       0.18     0.16
  3   0.0000     -2.64     0.20      -0.64    -0.44
  4   0.0000     -4.12     0.29      -0.10     0.32
  5   0.0002    -19.89     0.16      -2.40     0.21
  6   0.0002    -21.33    -0.48      -2.61     0.11
  7   0.0002    -21.68    -0.02      -2.87    -0.04
  8   0.0002    -22.65    -0.19      -2.76     0.18
  9   0.0024   -267.59     0.10     -35.60     0.39
 10   0.0025   -274.90    -0.07     -36.81     0.22
 11   0.0025   -281.57     0.46     -37.74     0.35
 12   0.0028   -312.48    -0.18     -42.68    -0.04
 13   0.0028   -313.85     0.25     -43.07    -0.17
 14   0.0028   -315.08    -0.09     -43.08    -0.04
 15   0.0055   -615.74    -0.69     -87.82     0.07
 16   0.0055   -616.30     0.24     -88.29    -0.15
 17   0.0056   -618.08    -0.05     -88.43    -0.05
 18   0.0056   -619.78    -0.26     -88.76    -0.14
 19   0.0080   -891.75    -0.17    -132.37    -0.03
 20   0.0080   -893.19     0.06    -132.59     0.04
 21   0.0080   -894.89     0.04    -132.91     0.01
 22   0.0080   -896.55     0.07    -133.00     0.21
 23   0.0081   -903.27    -0.04    -134.49    -0.13
 24   0.0081   -904.17     0.12    -134.89    -0.35
 25   0.0083   -924.63    -0.03    -138.71    -0.60
 26   0.0083   -925.43     0.21    -138.64    -0.34
 27   0.0083   -926.66     0.02    -138.64    -0.16
 28   1.0735  59208.75    -0.01  -30688.95    -0.10
 29   1.0735  59204.08     0.10  -30690.84    -0.01
 30   1.0735  59199.07    -0.15  -30692.60     0.20
 31   1.0736  59194.43    -0.02  -30694.71     0.08
 32   1.0836  58003.77    -0.60  -31207.23     0.67
 33   1.0836  57998.30 (  -0.37) -31209.48 (   0.97)
 34   1.0836  57992.04    -0.91  -31212.94     0.07
 35   1.0891  57356.84 (   1.71) -31507.61 (  -1.15)
 36   1.0891  57350.57     0.63  -31508.67     0.22
 37   1.0891  57344.74    -0.02  -31511.57    -0.24
 38   1.0951  56654.37     0.22  -31844.67     0.09
 39   1.0951  56648.98     0.35  -31847.71    -0.21
 40   1.0952  56643.56     0.43  -31849.69     0.54
 41   1.1417  51745.05     0.24  -34824.61     0.05
 42   1.1417  51741.82     0.20  -34827.03     0.03
 43   1.1418  51738.59     0.16  -34829.54    -0.09
 44   1.1418  51735.34     0.09  -34831.96    -0.11
 45   1.9631 154963.82    -0.06  -60908.74    -0.27
 46   1.9633 154951.57     0.10  -60913.82     0.17
 47   2.2657 120914.50     0.27  -77836.11    -0.20
 48   2.2657 120913.33     0.07  -77838.20    -0.22
 49   2.2658 120911.59    -0.71  -77840.07    -0.01

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.

15HT171    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        11.518    11.518    11.517
ecceobj         0.285     0.285     0.285
incobj         33.245    33.245    33.245
qmin            6.260     7.073     6.839
qmax           20.684    20.711    17.424
amean          11.776    12.088    11.626
amin           11.297    11.370    10.748
amax           13.623    14.186    12.330
emean           0.381     0.383     0.329
emin            0.285     0.285     0.227
emax            0.527     0.460     0.421
imean          30.408    30.770    33.114
imin           26.844    29.553    30.159
imax           32.440    32.361    35.745
excite_mean     0.637     0.640     0.639
fracstop        0.011     0.009     0.028
cjmean          3.553     3.501     3.573

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       206.9     201.0     195.5
kozaiamp        176.2      80.3     179.4