Orbit Fit and Astrometric record for 15BT518

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: 15BT518   
# Created Mon Dec 18 02:38:09 2017
# Orbit generated from Bernstein formalism
# Fitting   46 observations of   46
# Arc:   4.35y
# First observation: 2011/01/16
#  Last observation: 2015/05/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000068   0.023703   0.000012  -0.000814   0.023813   0.000000
# Chi-squared of fit:    20.23 DOF:   86 RMS:  0.12
# Min/Max residuals:    -0.38    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.568270E-05  2.342709E-02 -1.287517E-06 -8.104625E-04  2.379954E-02  1.381510E-03
# Covariance matrix:
  2.0778E-13 -1.9864E-13  1.2503E-15  4.7024E-15 -1.4295E-13 -1.5462E-12
 -1.9864E-13  8.8346E-13 -1.1809E-14 -2.8593E-14  9.5228E-13  8.5393E-12
  1.2503E-15 -1.1809E-14  1.6977E-13 -4.3612E-14 -1.5022E-14 -1.1379E-13
  4.7024E-15 -2.8593E-14 -4.3612E-14  1.4960E-14 -3.2257E-14 -2.7984E-13
 -1.4295E-13  9.5228E-13 -1.5022E-14 -3.2257E-14  1.1079E-12  9.2848E-12
 -1.5462E-12  8.5393E-12 -1.1379E-13 -2.7984E-13  9.2848E-12  8.3939E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    7.890954 -154.176690    0.986070    0.000876   -0.006387  2455578.145336
# Heliocentric elements and errors
Epoch:              2455570.5000  =  2011/01/09
Mean Anomaly:           45.60626 +/-     0.294
Argument of Peri:       53.05177 +/-     0.342
Long of Asc Node:      101.62574 +/-     0.002
Inclination:             8.08795 +/-     0.000
Eccentricity:         0.04728294 +/-    0.0003
Semi-Major Axis:     43.41537072 +/-    0.0029
Time of Perihelion: 2442333.6187 +/-      85.4
Perihelion:          41.36256430 +/-    0.0127
Aphelion:            45.46817714 +/-    0.0127
Period (y)              286.0708 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.89457836 +/-    0.0017
Ecliptic Y          -17.24587651 +/-    0.0008
Ecliptic Z            5.76846250 +/-    0.0003
Ecliptic XDOT         0.00101975 +/-    0.0000
Ecliptic YDOT        -0.00249391 +/-    0.0000
Ecliptic ZDOT        -0.00007052 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.03206497 +/-    0.0015
Geocenter to KBO     42.01762709 +/-    0.0019
# Hcoef:  5.84

The following table shows the complete astrometric record for 15BT518. 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 (15BT518) followed by the observatory code and reference code for the source of the astrometry.

2011 01  16.64457  13 47 13.103  -02 37 03.51  22.2w 15BT518   F51  C~1vYB      
2011 01  16.64789  13 47 13.107  -02 37 03.79  22.2w 15BT518   F51  C~1vYB      
2011 01  16.64855  13 47 13.112  -02 37 03.77  22.4w 15BT518   F51  C~1vYB      
2011 01  16.65253  13 47 13.107  -02 37 03.59  22.0w 15BT518   F51  C~1vYB      
2011 01  16.65319  13 47 13.105  -02 37 03.57  22.2w 15BT518   F51  C~1vYB      
2011 01  16.65649  13 47 13.115  -02 37 03.68  22.1w 15BT518   F51  C~1vYB      
2011 01  16.65715  13 47 13.101  -02 37 03.63  22.1w 15BT518   F51  C~1vYB      
2013 04  10.42368  13 54 07.046  -03 11 14.62  22.4w 15BT518   F51  C~1vYB      
2013 04  10.43730  13 54 06.998  -03 11 14.27  22.3w 15BT518   F51  C~1vYB      
2013 04  10.45102  13 54 06.918  -03 11 13.92  21.9w 15BT518   F51  C~1vYB      
2013 04  10.46469  13 54 06.866  -03 11 13.76  22.2w 15BT518   F51  C~1vYB      
2013 05  03.37641  13 52 23.733  -03 01 59.78  21.9w 15BT518   F51  C~1vYB      
2013 05  03.38995  13 52 23.667  -03 01 59.60  21.9w 15BT518   F51  C~1vYB      
2013 05  03.40353  13 52 23.601  -03 01 59.21  22.3w 15BT518   F51  C~1vYB      
2013 05  03.41707  13 52 23.548  -03 01 58.85  21.9w 15BT518   F51  C~1vYB      
2014 06  29.27703  13 54 28.139  -03 25 09.79  22.3w 15BT518   F51  C~1vYB      
2014 06  29.28812  13 54 28.106  -03 25 10.14  22.3w 15BT518   F51  C~1vYB      
2014 06  29.29922  13 54 28.112  -03 25 10.13  22.2w 15BT518   F51  C~1vYB      
2014 06  29.31031  13 54 28.087  -03 25 10.16  22.3w 15BT518   F51  C~1vYB      
2015 01  28.61049  14 07 09.148  -04 40 20.89  22.4w 15BT518   F51  C~1vYB      
2015 01  28.62275  14 07 09.151  -04 40 20.64  22.3w 15BT518   F51  C~1vYB      
2015 01  28.63503  14 07 09.161  -04 40 20.47  22.3w 15BT518   F51  C~1vYB      
2015 01  28.64732  14 07 09.158  -04 40 20.42  22.2w 15BT518   F51  C~1vYB      
2015 01  30.58071  14 07 09.877  -04 40 02.09  22.2w 15BT518   F51  C~1vYB      
2015 01  30.59283  14 07 09.881  -04 40 01.98  22.1w 15BT518   F51  C~1vYB      
2015 01  30.60489  14 07 09.874  -04 40 01.94  22.2w 15BT518   F51  C~1vYB      
2015 01  30.61698  14 07 09.883  -04 40 01.78  22.2w 15BT518   F51  C~1vYB      
2015 02  24.58220  14 06 48.439  -04 33 37.31  22.1w 15BT518   F51  C~1vYB      
2015 02  24.59522  14 06 48.426  -04 33 36.95  22.2w 15BT518   F51  C~1vYB      
2015 02  24.60824  14 06 48.395  -04 33 36.74  21.8w 15BT518   F51  C~1vYB      
2015 02  24.62128  14 06 48.372  -04 33 36.71  22.0w 15BT518   F51  C~1vYB      
2015 03  21.48141  14 05 37.288  -04 23 52.79  21.7w 15BT518   F51  C~1vYB      
2015 03  21.49271  14 05 37.239  -04 23 52.40  22.2w 15BT518   F51  C~1vYB      
2015 03  21.50398  14 05 37.197  -04 23 52.21  21.8w 15BT518   F51  C~1vYB      
2015 03  21.51528  14 05 37.155  -04 23 51.93  22.3w 15BT518   F51  C~1vYB      
2015 03  21.51790  14 05 37.158  -04 23 51.93  22.1w 15BT518   F51  C~1vYB      
2015 03  21.53059  14 05 37.081  -04 23 51.75  22.0w 15BT518   F51  C~1vYB      
2015 03  21.54348  14 05 37.048  -04 23 50.96  22.1w 15BT518   F51  C~1vYB      
2015 03  21.55625  14 05 37.010  -04 23 50.93  22.2w 15BT518   F51  C~1vYB      
2015 04  21.45513  14 03 26.344  -04 10 32.08  22.1w 15BT518   F51  C~1vYB      
2015 04  21.46806  14 03 26.276  -04 10 31.92  22.3w 15BT518   F51  C~1vYB      
2015 04  21.51871  14 03 26.058  -04 10 30.63  22.2w 15BT518   F51  C~1vYB      
2015 04  21.53169  14 03 25.996  -04 10 30.30  22.2w 15BT518   F51  C~1vYB      
2015 05  25.31855  14 01 00.887  -03 59 29.98  21.7i 15BT518   F51  C~1vYB      
2015 05  25.33144  14 01 00.826  -03 59 29.62  21.7i 15BT518   F51  C~1vYB      
2015 05  25.34435  14 01 00.784  -03 59 29.26  21.6i 15BT518   F51  C~1vYB      

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     0.15
  2   0.0000      0.16     0.09      -0.24    -0.12
  3   0.0000      0.22     0.15      -0.19    -0.08
  4   0.0000      0.08    -0.04      -0.05     0.01
  5   0.0000      0.05    -0.08      -0.05     0.02
  6   0.0000      0.23     0.06      -0.09    -0.07
  7   0.0000      0.02    -0.16      -0.12    -0.11
  8   2.2307   6526.71    -0.09     303.14     0.09
  9   2.2308   6525.92     0.11     303.21     0.16
 10   2.2308   6524.67    -0.13     303.11     0.05
 11   2.2309   6523.89     0.08     302.98    -0.08
 12   2.2936   4881.93     0.06     268.60     0.06
 13   2.2936   4880.94     0.03     268.41    -0.07
 14   2.2937   4879.88    -0.08     268.42    -0.00
 15   2.2937   4879.01     0.00     268.48     0.11
 16   3.4487   7120.53     0.03    -364.63     0.23
 17   3.4487   7120.20    -0.12    -365.14    -0.15
 18   3.4487   7120.28     0.15    -365.10     0.02
 19   3.4488   7119.94     0.00    -365.26    -0.01
 20   4.0328  19421.12     0.09    -538.88    -0.10
 21   4.0328  19421.07     0.01    -538.63     0.03
 22   4.0328  19421.15     0.07    -538.42     0.11
 23   4.0329  19421.09    -0.02    -538.38     0.01
 24   4.0382  19424.70    -0.07    -517.35     0.08
 25   4.0382  19424.72    -0.05    -517.22     0.08
 26   4.0382  19424.60    -0.15    -517.22    -0.05
 27   4.0383  19424.67    -0.08    -517.02     0.03
 28   4.1066  18985.09    -0.16    -269.54    -0.12
 29   4.1066  18984.78    -0.01    -269.27     0.04
 30   4.1067  18984.26    -0.05    -269.23    -0.03
 31   4.1067  18983.93     0.08    -269.33    -0.23
 32   4.1748  17773.57     0.15     -98.33     0.14
 33   4.1748  17772.74     0.02     -98.22     0.20
 34   4.1748  17772.08     0.06     -98.27     0.10
 35   4.1749  17771.39     0.07     -98.23     0.09
 36   4.1749  17771.44     0.27     -98.21     0.10
 37   4.1749  17770.29    -0.09     -98.45    -0.20
 38   4.1749  17769.54    -0.04     -97.88     0.31
 39   4.1750  17768.99     0.20     -98.06     0.08
 40   4.2596  15644.38    -0.11     -43.02     0.03
 41   4.2596  15643.37    -0.17     -43.23    -0.16
 42   4.2598  15639.84     0.04     -43.18    -0.02
 43   4.2598  15638.85     0.00     -43.20    -0.02
 44   4.3523  13363.51     0.11    -196.61    -0.38
 45   4.3523  13362.52    -0.12    -196.60    -0.27
 46   4.3524  13361.80    -0.08    -196.48    -0.05

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.

15BT518    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.336    43.344    43.328
ecceobj         0.047     0.046     0.047
incobj          8.088     8.088     8.088
qmin           40.487    40.543    40.501
qmax           46.941    46.918    46.926
amean          43.627    43.635    43.619
amin           43.288    43.292    43.282
amax           43.982    43.991    43.968
emean           0.052     0.051     0.052
emin            0.036     0.035     0.036
emax            0.068     0.067     0.068
imean           6.421     6.417     6.424
imin            5.746     5.752     5.746
imax            7.090     7.085     7.093
excite_mean     0.123     0.123     0.123
fracstop        1.000     1.000     1.000
cjmean          3.079     3.079     3.079

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       177.0     177.1     177.1
kozaiamp        179.8     180.0     179.9