Orbit Fit and Astrometric record for 15GJ54

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: 15GJ54    
# Created Sun Apr 21 01:10:05 2019
# Orbit generated from Bernstein formalism
# Fitting   36 observations of   36
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000136   0.018147   0.000001  -0.006294   0.022349   0.000000
# Chi-squared of fit:     7.92 DOF:   66 RMS:  0.08
# Min/Max residuals:    -0.21    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.301954E-05  1.808326E-02 -4.341098E-06 -6.295749E-03  2.244457E-02  2.918471E-03
# Covariance matrix:
  1.9017E-13 -3.7268E-14  8.4624E-15 -4.3757E-14  1.4797E-13  4.4184E-12
 -3.7268E-14  2.0341E-13  1.2067E-14 -6.1821E-14  1.1349E-13  6.2275E-12
  8.4624E-15  1.2067E-14  1.0229E-13 -1.0148E-13  1.9217E-14  1.1408E-12
 -4.3757E-14 -6.1821E-14 -1.0148E-13  1.9481E-13 -9.8936E-14 -5.8402E-12
  1.4797E-13  1.1349E-13  1.9217E-14 -9.8936E-14  2.6296E-13  9.9789E-12
  4.4184E-12  6.2275E-12  1.1408E-12 -5.8402E-12  9.9789E-12  5.8819E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.358792 -154.824691    0.825859    0.003513   -0.537345  2457071.002878
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          129.75333 +/-     0.267
Argument of Peri:       34.24693 +/-     0.252
Long of Asc Node:       25.14669 +/-     0.000
Inclination:            19.11209 +/-     0.001
Eccentricity:         0.19849408 +/-    0.0006
Semi-Major Axis:     39.34813297 +/-    0.0100
Time of Perihelion: 2424576.6896 +/-      65.6
Perihelion:          31.53776158 +/-    0.0248
Aphelion:            47.15850436 +/-    0.0263
Period (y)              246.8280 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.16163448 +/-    0.0009
Ecliptic Y          -18.43361407 +/-    0.0004
Ecliptic Z            0.27880163 +/-    0.0000
Ecliptic XDOT         0.00060816 +/-    0.0000
Ecliptic YDOT        -0.00215537 +/-    0.0000
Ecliptic ZDOT        -0.00076564 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.10161872 +/-    0.0009
Geocenter to KBO     44.55420710 +/-    0.0010
# Hcoef:  7.75

The following table shows the complete astrometric record for 15GJ54. 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 (15GJ54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.50210  13 33 50.647  -09 24 28.34  24.1r 15GJ54    568  C~2lV6      
2015 02  17.54344  13 33 50.564  -09 24 27.94  24.2r 15GJ54    568  C~2lV6      
2015 02  20.47426  13 33 43.915  -09 23 59.27  24.1r 15GJ54    568  C~2lV6      
2015 03  18.52182  13 32 20.488  -09 17 25.61  24.0r 15GJ54    568  C~2lV6      
2015 03  20.52388  13 32 12.611  -09 16 47.10  24.2r 15GJ54    568  C~2lV6      
2015 04  11.41445  13 30 38.879  -09 09 01.92  24.1r 15GJ54    568  C~2lV6      
2015 04  12.36711  13 30 34.625  -09 08 40.75  24.0r 15GJ54    568  C~2lV6      
2015 04  12.40803  13 30 34.436  -09 08 39.87  23.4r 15GJ54    568  C~2lV6      
2015 04  12.45503  13 30 34.227  -09 08 38.45  24.4r 15GJ54    568  C~2lV6      
2015 04  14.46499  13 30 25.243  -09 07 53.86  24.2r 15GJ54    568  C~2lV6      
2015 04  18.42564  13 30 07.528  -09 06 25.60  24.3r 15GJ54    568  C~2lV6      
2015 04  18.47335  13 30 07.322  -09 06 24.41  23.8r 15GJ54    568  C~2lV6      
2015 05  16.27210  13 28 10.840  -08 56 51.99  24.4r 15GJ54    568  C~2lV6      
2015 05  25.37637  13 27 38.869  -08 54 21.11  24.3r 15GJ54    568  C~2lV6      
2015 05  25.43418  13 27 38.685  -08 54 20.26  24.1r 15GJ54    568  C~2lV6      
2015 06  21.32593  13 26 33.971  -08 49 49.56  24.4r 15GJ54    568  C~2lV6      
2015 06  22.28249  13 26 32.627  -08 49 45.59  24.1r 15GJ54    568  C~2lV6      
2015 07  15.26670  13 26 22.023  -08 50 17.26  24.6r 15GJ54    568  C~2lV6      
2015 07  19.26636  13 26 24.568  -08 50 48.66  24.0r 15GJ54    568  C~2lV6      
2016 02  04.57558  13 37 34.328  -10 08 19.07  24.7w 15GJ54    568  C~2lV6      
2016 02  04.60217  13 37 34.294  -10 08 19.01  24.6w 15GJ54    568  C~2lV6      
2016 02  10.56342  13 37 26.698  -10 07 57.98  24.5w 15GJ54    568  C~2lV6      
2016 02  10.62117  13 37 26.608  -10 07 57.56  24.1w 15GJ54    568  C~2lV6      
2016 02  11.58524  13 37 25.102  -10 07 52.63  24.1w 15GJ54    568  C~2lV6      
2016 03  11.58783  13 36 08.077  -10 02 20.58  24.3w 15GJ54    568  C~2lV6      
2016 03  11.63454  13 36 07.923  -10 02 19.63  24.5w 15GJ54    568  C~2lV6      
2016 03  12.48427  13 36 04.877  -10 02 05.48  24.4w 15GJ54    568  C~2lV6      
2016 04  09.44264  13 34 09.444  -09 52 46.45  24.4w 15GJ54    568  C~2lV6      
2016 05  02.32341  13 32 28.487  -09 44 28.47  24.3w 15GJ54    568  C~2lV6      
2016 05  06.33319  13 32 11.688  -09 43 06.10  24.4w 15GJ54    568  C~2lV6      
2016 05  28.31243  13 30 51.057  -09 36 39.03  24.4w 15GJ54    568  C~2lV7      
2016 05  29.31935  13 30 47.943  -09 36 24.67  24.6w 15GJ54    568  C~2lV7      
2016 06  04.38178  13 30 30.538  -09 35 05.43  24.5w 15GJ54    568  C~2lV7      
2016 06  27.29699  13 29 47.842  -09 32 19.15  24.3w 15GJ54    568  C~2lV7      
2016 07  07.29960  13 29 41.845  -09 32 20.17  24.4w 15GJ54    568  C~2lV7      
2017 03  29.46402  13 38 23.534  -10 39 39.87        15GJ54    568  C~2lV7      

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    -0.06       0.00    -0.02
  2   0.0001     -1.29     0.06      -0.08     0.05
  3   0.0081   -103.36    -0.06      -9.29     0.03
  4   0.0795  -1396.63    -0.10     -94.10     0.00
  5   0.0849  -1519.25     0.07    -100.93    -0.08
  6   0.1449  -2981.19    -0.01    -176.75    -0.06
  7   0.1475  -3047.57    -0.02    -180.18    -0.13
  8   0.1476  -3050.50    -0.05    -180.39    -0.17
  9   0.1477  -3053.90    -0.12    -180.20     0.20
 10   0.1532  -3194.06     0.07    -187.57     0.02
 11   0.1641  -3470.58     0.04    -201.83    -0.02
 12   0.1642  -3473.86     0.14    -201.84     0.15
 13   0.2403  -5289.84    -0.08    -304.56    -0.03
 14   0.2652  -5786.21    -0.03    -339.03    -0.02
 15   0.2654  -5789.06     0.10    -339.24    -0.00
 16   0.3390  -6781.27    -0.02    -441.89     0.05
 17   0.3416  -6801.27     0.05    -445.57     0.02
 18   0.4046  -6935.76    -0.05    -533.15     0.13
 19   0.4155  -6889.05     0.03    -548.39     0.03
 20   0.9639   4037.32     0.04   -1248.47    -0.00
 21   0.9640   4036.83    -0.03   -1248.59    -0.02
 22   0.9803   3924.63     0.02   -1269.64    -0.11
 23   0.9805   3923.24     0.01   -1269.73     0.03
 24   0.9831   3900.72     0.05   -1273.19    -0.05
 25   1.0625   2719.92    -0.11   -1376.52    -0.21
 26   1.0626   2717.45     0.05   -1376.46     0.03
 27   1.0650   2670.38     0.04   -1379.62    -0.14
 28   1.1415    878.30    -0.06   -1479.72     0.02
 29   1.2042   -692.75     0.13   -1561.19     0.03
 30   1.2151   -954.04     0.07   -1575.42    -0.00
 31   1.2753  -2205.36     0.04   -1652.25    -0.02
 32   1.2781  -2253.48    -0.03   -1655.80    -0.08
 33   1.2947  -2522.06    -0.06   -1676.59     0.05
 34   1.3574  -3170.68    -0.08   -1753.99     0.31
 35   1.3848  -3252.83     0.01   -1787.57     0.08
 36   2.1108   5395.86    -0.03   -2739.59    -0.04

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.

15GJ54    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.064    39.092    39.036
ecceobj         0.204     0.205     0.202
incobj         19.206    19.205    19.206
qmin           30.636    29.222    31.048
qmax           48.949    50.355    48.553
amean          39.456    39.455    39.456
amin           38.977    38.981    38.936
amax           40.010    39.989    40.056
emean           0.202     0.223     0.196
emin            0.172     0.182     0.178
emax            0.224     0.259     0.214
imean          18.677    18.054    18.780
imin           18.198    16.898    18.339
imax           19.488    19.270    19.321
excite_mean     0.378     0.382     0.377
fracstop        1.000     1.000     1.000
cjmean          2.888     2.885     2.888

libcent 0       179.9     180.9     179.6
libamp  0       111.4     100.5     123.1
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       187.1     162.5     200.2
kozaiamp        180.0     180.0     180.0