Orbit Fit and Astrometric record for 15HO171

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: 15HO171   
# Created Mon Oct 23 01:38:35 2017
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   68 observations of   69
# Arc:   3.04y
# First observation: 2014/05/30
#  Last observation: 2017/06/13
# Chi-squared of fit:   329.39 DOF:  130 RMS:  0.39
# Min/Max residuals:    -0.99    1.20
# Exact a, adot, b, bdot, g, gdot:
  3.678771E-05  3.597778E-01  2.124428E-05  1.997606E-01  1.574226E-01 -2.522902E-03
# Covariance matrix:
  9.6818E-14 -8.5235E-14  1.6229E-14 -2.9501E-14 -1.4560E-14 -2.5873E-14
 -8.5235E-14  1.3034E-13 -3.1461E-14  5.8380E-14  5.7229E-14  5.4414E-14
  1.6229E-14 -3.1461E-14  8.1318E-14 -5.3593E-14 -8.5273E-15 -1.6225E-14
 -2.9501E-14  5.8380E-14 -5.3593E-14  5.7020E-14  1.9228E-14  3.0002E-14
 -1.4560E-14  5.7229E-14 -8.5273E-15  1.9228E-14  9.8492E-14  2.6929E-14
 -2.5873E-14  5.4414E-14 -1.6225E-14  3.0002E-14  2.6929E-14  2.7684E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
   14.103755  -53.708229    0.855712    0.132957   -0.528999  2456807.856308
# Heliocentric elements and errors
Epoch:              2456808.5000  =  2014/05/31
Mean Anomaly:          335.59837 +/-     0.001
Argument of Peri:       63.16044 +/-     0.001
Long of Asc Node:      278.57813 +/-     0.000
Inclination:            33.26558 +/-     0.000
Eccentricity:         0.23222085 +/-    0.0000
Semi-Major Axis:      8.64831826 +/-    0.0000
Time of Perihelion: 2457438.1690 +/-       0.1
Perihelion:           6.63999847 +/-    0.0000
Aphelion:            10.65663805 +/-    0.0001
Period (y)               25.4335 +/-      0.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            3.27805968 +/-    0.0000
Ecliptic Y           -5.90987024 +/-    0.0000
Ecliptic Z            1.54812601 +/-    0.0000
Ecliptic XDOT         0.00451182 +/-    0.0000
Ecliptic YDOT         0.00441661 +/-    0.0000
Ecliptic ZDOT         0.00335889 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    6.93320810 +/-    0.0000
Geocenter to KBO      6.35234284 +/-    0.0000
# Hcoef: 12.15

The following table shows the complete astrometric record for 15HO171. 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 (15HO171) followed by the observatory code and reference code for the source of the astrometry.

2014 05  30.35553  20 20 45.09   -05 00 46.1   20.4V 15HO171   G96  C~1T2U      
2014 05  30.36023  20 20 45.06   -05 00 45.0   20.1V 15HO171   G96  C~1T2U      
2014 05  30.36489  20 20 44.99   -05 00 44.0   20.3V 15HO171   G96  C~1T2U      
2014 05  30.36955  20 20 44.96   -05 00 42.9   20.2V 15HO171   G96  C~1T2U      
2014 05  31.53609  20 20 33.729  -04 56 51.34  20.6w 15HO171   F51  C~1T2U      
2014 05  31.54913  20 20 33.588  -04 56 48.80  20.5w 15HO171   F51  C~1T2U      
2014 05  31.56219  20 20 33.447  -04 56 46.21  20.7w 15HO171   F51  C~1T2U      
2014 05  31.57526  20 20 33.310  -04 56 43.70  20.8w 15HO171   F51  C~1T2U      
2014 06  30.44112  20 12 06.186  -03 37 24.47  20.4w 15HO171   F51  C~1T2U      
2014 06  30.45369  20 12 05.891  -03 37 23.04  20.5w 15HO171   F51  C~1T2U      
2015 04  23.46548  21 24 33.17   +07 18 33.8   21.1V 15HO171   691  C~1RND      
2015 04  23.47725  21 24 33.35   +07 18 39.4   20.8V 15HO171   691  C~1RND      
2015 04  23.48902  21 24 33.62   +07 18 42.6   20.7V 15HO171   691  C~1RND      
2015 04  28.46183  21 26 08.32   +07 49 16.7   20.8V 15HO171   691  C~1RND      
2015 04  28.47066  21 26 08.44   +07 49 20.5   20.4V 15HO171   691  C~1RND      
2015 04  28.47945  21 26 08.61   +07 49 23.2   20.8V 15HO171   691  C~1RND      
2015 04  29.43424  21 26 25.54   +07 55 14.8   20.7R 15HO171   291  C~1RND      
2015 04  29.43819  21 26 25.60   +07 55 15.5   21.0R 15HO171   926  C~1RND      
2015 04  29.44727  21 26 25.79   +07 55 19.3   20.6R 15HO171   291  C~1RND      
2015 04  29.44935  21 26 25.82   +07 55 20.4   20.8R 15HO171   926  C~1RND      
2015 04  29.46030  21 26 26.00   +07 55 24.2   20.3R 15HO171   291  C~1RND      
2015 04  29.46045  21 26 26.00   +07 55 24.3   20.5R 15HO171   926  C~1RND      
2015 04  30.44337  21 26 42.92   +08 01 25.7         15HO171   291  C~1RND      
2015 04  30.44598  21 26 42.96   +08 01 26.9   20.9R 15HO171   926  C~1RND      
2015 04  30.45508  21 26 43.11   +08 01 30.0         15HO171   291  C~1RND      
2015 04  30.45862  21 26 43.14   +08 01 32.2   20.6R 15HO171   926  C~1RND      
2015 04  30.46662  21 26 43.32   +08 01 34.6         15HO171   291  C~1RND      
2015 04  30.47138  21 26 43.45   +08 01 35.8   20.4R 15HO171   926  C~1RND      
2015 06  04.54525  21 31 27.897  +11 25 43.74  20.1i 15HO171   F51  C~1T2U      
2015 06  04.55668  21 31 27.872  +11 25 47.34  20.1i 15HO171   F51  C~1T2U      
2015 06  04.56810  21 31 27.844  +11 25 51.08  20.3i 15HO171   F51  C~1T2U      
2015 06  04.57972  21 31 27.816  +11 25 54.68  20.1i 15HO171   F51  C~1T2U      
2015 06  05.53963  21 31 26.316  +11 30 58.45  20.1i 15HO171   F51  C~1T2U      
2015 06  05.56244  21 31 26.251  +11 31 05.78  20.2i 15HO171   F51  C~1T2U      
2015 06  05.57395  21 31 26.231  +11 31 09.36  20.3i 15HO171   F51  C~1T2U      
2015 06  11.38281  21 31 06.03   +12 00 52.2         15HO171   691  C~1T2U      
2015 06  11.39984  21 31 05.85   +12 00 57.5   20.7V 15HO171   691  C~1T2U      
2015 06  11.41687  21 31 05.78   +12 01 02.9   20.8V 15HO171   691  C~1T2U      
2015 07  08.58240  21 25 32.454  +13 53 05.16  20.0i 15HO171   F51  C~1UFz      
2015 07  08.59050  21 25 32.300  +13 53 06.98  20.0i 15HO171   F51  C~1UFz      
2015 07  08.59858  21 25 32.149  +13 53 08.53  20.0i 15HO171   F51  C~1UFz      
2015 07  08.60663  21 25 31.985  +13 53 10.06  19.9i 15HO171   F51  C~1UFz      
2015 07  10.27045  21 25 00.19   +13 58 16.0   19.8R 15HO171   H36  C~1UFz      
2015 07  10.30278  21 24 59.61   +13 58 20.9   19.9R 15HO171   H36  C~1UFz      
2015 09  08.55668  21 00 48.36   +14 19 07.2   20.9R 15HO171   D29  C~1Wks      
2015 09  08.56903  21 00 48.16   +14 19 05.1   20.2R 15HO171   D29  C~1Wks      
2016 05  27.40693  22 48 01.48   +24 57 47.0   20.7V 15HO171   691  C~1tb0      
2016 05  27.42219  22 48 01.69   +24 57 53.1   20.7V 15HO171   691  C~1tb0      
2016 05  27.43740  22 48 01.95   +24 57 59.6   20.3V 15HO171   691  C~1tb0      
2016 06  07.35103  22 50 29.24   +26 11 39.4         15HO171   691  C~1u6P      
2016 06  07.35752  22 50 29.30   +26 11 42.0         15HO171   691  C~1u6P      
2016 06  07.36399  22 50 29.34   +26 11 45.7   21.0V 15HO171   691  C~1u6P      
2016 06  19.55991  22 51 57.304  +27 29 51.62  20.2i 15HO171   F51  C~1unO      
2016 06  19.57030  22 51 57.331  +27 29 55.51  20.2i 15HO171   F51  C~1unO      
2016 06  19.58072  22 51 57.383  +27 29 59.48  20.2i 15HO171   F51  C~1unO      
2016 06  19.59121  22 51 57.392  +27 30 03.24  20.2i 15HO171   F51  C~1unO      
2016 07  14.26815  22 50 32.27   +29 44 39.6   21.0V 15HO171   691  C~1vYb      
2016 07  14.27745  22 50 32.13   +29 44 42.7   20.8V 15HO171   691  C~1vYb      
2016 07  14.28675  22 50 32.05   +29 44 44.9   20.5V 15HO171   691  C~1vYb      
2016 08  25.58403  22 36 14.58   +31 29 26.3   20.7R 15HO171   D29  C~1wzC      
2016 08  25.61232  22 36 13.68   +31 29 26.7   21.0R 15HO171   D29  C~1wzC      
2016 09  02.59505  22 32 39.19   +31 26 23.2   20.4R 15HO171   D29  C~1xhY      
2016 09  02.61096  22 32 38.76   +31 26 22.1   20.4R 15HO171   D29  C~1xhY      
2016 09  02.62687  22 32 38.33   +31 26 21.7   20.2R 15HO171   D29  C~1xhY      
2016 09  21.51086  22 24 36.21   +30 51 22.9   20.0R 15HO171   D29  C~1yHB      
2016 09  21.52854  22 24 35.81   +30 51 20.9   20.6R 15HO171   D29  C~1yHB      
2017 06  13.41629  00 22 54.20   +36 57 51.5   20.0R 15HO171   695  C~2Gig      
2017 06  13.42682  00 22 54.45   +36 57 55.9   20.1R 15HO171   695  C~2Gig      
2017 06  13.43735  00 22 54.72   +36 58 00.1   19.8R 15HO171   695  C~2Gig      

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 (   1.03)      0.00 (  15.91)
  2   0.0000      0.00     0.27       0.00    -0.26
  3   0.0000      0.00    -0.10       0.00    -0.19
  4   0.0000      0.00     0.13       0.00    -0.02
  5   0.0032      0.00     0.19       0.00    -0.16
  6   0.0033      0.00     0.12       0.00    -0.19
  7   0.0033      0.00     0.05       0.00    -0.17
  8   0.0033      0.00     0.05       0.00    -0.23
  9   0.0851      0.00     0.28       0.00    -0.13
 10   0.0851      0.00     0.27       0.00    -0.18
 11   0.8983      0.00     0.14       0.00    -0.65
 12   0.8983      0.00    -0.67       0.00     0.60
 13   0.8984      0.00    -0.13       0.00    -0.55
 14   0.9120      0.00    -0.23       0.00    -0.12
 15   0.9120      0.00    -0.77       0.00     0.42
 16   0.9120      0.00    -0.54       0.00    -0.12
 17   0.9147      0.00    -0.18       0.00     0.08
 18   0.9147      0.00    -0.30       0.00    -0.69
 19   0.9147      0.00     0.20       0.00    -0.23
 20   0.9147      0.00     0.12       0.00     0.09
 21   0.9147      0.00    -0.01       0.00    -0.13
 22   0.9147      0.00    -0.04       0.00    -0.10
 23   0.9174      0.00    -0.42       0.00    -0.14
 24   0.9174      0.00    -0.47       0.00     0.09
 25   0.9175      0.00    -0.51       0.00    -0.15
 26   0.9175      0.00    -0.94       0.00     0.73
 27   0.9175      0.00    -0.25       0.00     0.20
 28   0.9175      0.00     0.51       0.00    -0.37
 29   1.0135      0.00     0.16       0.00    -0.32
 30   1.0136      0.00     0.09       0.00    -0.36
 31   1.0136      0.00    -0.01       0.00    -0.25
 32   1.0136      0.00    -0.11       0.00    -0.35
 33   1.0162      0.00     0.07       0.00    -0.37
 34   1.0163      0.00    -0.09       0.00    -0.24
 35   1.0163      0.00     0.02       0.00    -0.30
 36   1.0322      0.00     0.96       0.00    -0.95
 37   1.0323      0.00    -0.33       0.00    -0.75
 38   1.0323      0.00     0.04       0.00    -0.44
 39   1.1067      0.00     0.19       0.00    -0.42
 40   1.1067      0.00     0.23       0.00    -0.11
 41   1.1068      0.00     0.31       0.00    -0.08
 42   1.1068      0.00     0.19       0.00    -0.05
 43   1.1113      0.00     0.12       0.00     0.37
 44   1.1114      0.00     1.10       0.00    -0.56
 45   1.2764      0.00    -0.03       0.00    -0.15
 46   1.2764      0.00     0.78       0.00    -0.80
 47   1.9933      0.00     0.13       0.00    -0.16
 48   1.9933      0.00    -0.39       0.00    -0.38
 49   1.9934      0.00    -0.14       0.00    -0.18
 50   2.0233      0.00     0.09       0.00    -0.90
 51   2.0233      0.00    -0.03       0.00    -0.89
 52   2.0233      0.00    -0.44       0.00     0.22
 53   2.0567      0.00     0.01       0.00    -0.33
 54   2.0567      0.00    -0.09       0.00    -0.30
 55   2.0567      0.00     0.19       0.00    -0.20
 56   2.0568      0.00    -0.18       0.00    -0.33
 57   2.1243      0.00     0.37       0.00    -0.16
 58   2.1244      0.00    -0.22       0.00     0.34
 59   2.1244      0.00     0.10       0.00    -0.05
 60   2.2402      0.00     1.20       0.00    -0.19
 61   2.2403      0.00    -0.77       0.00     0.00
 62   2.2621      0.00     0.48       0.00     0.37
 63   2.2622      0.00     0.59       0.00     0.06
 64   2.2622      0.00     0.71       0.00     0.45
 65   2.3139      0.00    -0.24       0.00    -0.99
 66   2.3140      0.00     0.05       0.00    -0.10
 67   3.0392      0.00    -0.17       0.00    -0.42
 68   3.0392      0.00    -0.33       0.00    -0.04
 69   3.0392      0.00    -0.18       0.00     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.

15HO171    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj         8.678     8.678     8.678
ecceobj         0.233     0.233     0.233
incobj         33.218    33.218    33.218
qmin            6.458     6.357     6.132
qmax           11.726    10.703    11.925
amean           8.924     8.600     8.765
amin            8.555     8.524     8.564
amax            9.188     8.678     9.155
emean           0.264     0.242     0.232
emin            0.233     0.233     0.147
emax            0.283     0.254     0.306
imean          33.408    34.789    35.332
imin           32.197    34.750    34.449
imax           34.839    34.839    36.777
excite_mean     0.611     0.620     0.624
fracstop        0.001     0.000     0.005
cjmean          4.258     4.350     4.293

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        81.0      64.8     161.3
kozaiamp         16.2       1.8      74.8