Orbit Fit and Astrometric record for 15GK55

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: 15GK55    
# Created Thu Dec  9 02:13:13 2021
# Orbit generated from Bernstein formalism
# Fitting     35 observations of     36
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000240   0.032684  -0.000033   0.016743   0.030278   0.000000
# Chi-squared of fit:     9.58 DOF:     64 RMS:  0.09
# Min/Max residuals:    -0.46    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.704841E-05  3.230988E-02  8.118876E-06  1.650665E-02  3.028949E-02 -3.902707E-03
# Covariance matrix:
  1.5429E-13 -1.9606E-14 -9.2135E-15  4.4900E-14  1.2527E-13  1.6947E-12
 -1.9606E-14  3.5313E-13 -3.5716E-14  1.9299E-13  1.9174E-13  7.2798E-12
 -9.2135E-15 -3.5716E-14  9.4697E-14 -1.1185E-13 -3.0339E-14 -1.1954E-12
  4.4900E-14  1.9299E-13 -1.1185E-13  3.0689E-13  1.5670E-13  6.4918E-12
  1.2527E-13  1.9174E-13 -3.0339E-14  1.5670E-13  2.7521E-13  5.9123E-12
  1.6947E-12  7.2798E-12 -1.1954E-12  6.4918E-12  5.9123E-12  2.4487E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.347783 -154.043109    0.832264    0.021743   -0.526940  2457071.093388
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          339.35319 +/-     0.048
Argument of Peri:       40.98439 +/-     0.094
Long of Asc Node:      200.03978 +/-     0.000
Inclination:            27.25311 +/-     0.001
Eccentricity:         0.26602259 +/-    0.0003
Semi-Major Axis:     43.88794080 +/-    0.0079
Time of Perihelion: 2463161.1928 +/-      14.2
Perihelion:          32.21275713 +/-    0.0143
Aphelion:            55.56312447 +/-    0.0164
Period (y)              290.7542 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -30.50065861 +/-    0.0005
Ecliptic Y          -13.92068521 +/-    0.0002
Ecliptic Z            1.35272255 +/-    0.0000
Ecliptic XDOT         0.00164649 +/-    0.0000
Ecliptic YDOT        -0.00245041 +/-    0.0000
Ecliptic ZDOT         0.00147642 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   33.55451551 +/-    0.0005
Geocenter to KBO     33.01475402 +/-    0.0006
# Hcoef:  9.30

The following table shows the complete astrometric record for 15GK55. 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 (15GK55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.59261  13 39 42.623  -07 50 17.11  24.7r 15GK55    568  C~2lVA      
2015 02  17.63360  13 39 42.531  -07 50 16.12  25.0r 15GK55    568  C~2lVA      
2015 02  20.62674  13 39 35.687  -07 48 54.89  24.7r 15GK55    568  C~2lVA      
2015 03  18.57107  13 38 02.885  -07 34 13.96  24.9r 15GK55    568  C~2lVA      
2015 03  18.61845  13 38 02.657  -07 34 12.23  24.9r 15GK55    568  C~2lVA      
2015 03  20.57526  13 37 53.645  -07 32 55.69  25.0r 15GK55    568  C~2lVA      
2015 04  11.50958  13 36 01.574  -07 17 53.38  24.6r 15GK55    568  C~2lVA      
2015 04  11.51365  13 36 01.552  -07 17 53.18  24.4r 15GK55    568  C~2lVA      
2015 04  13.37789  13 35 51.489  -07 16 34.99  24.3r 15GK55    568  C~2lVA      
2015 04  13.41891  13 35 51.272  -07 16 33.42  24.2r 15GK55    568  C~2lVA      
2015 04  13.42365  13 35 51.248  -07 16 33.16  24.1r 15GK55    568  C~2lVA      
2015 04  13.42846  13 35 51.225  -07 16 32.96  24.4r 15GK55    568  C~2lVA      
2015 04  13.43331  13 35 51.205  -07 16 32.82  23.9r 15GK55    568  C~2lVA      
2015 04  13.43815  13 35 51.164  -07 16 32.65  24.2r 15GK55    568  C~2lVA      
2015 04  13.52145  13 35 50.714  -07 16 29.09  24.4r 15GK55    568  C~2lVA      
2015 04  19.48929  13 35 18.391  -07 12 20.76  24.3r 15GK55    568  C~2lVA      
2015 04  19.56015  13 35 17.975  -07 12 17.55  24.0r 15GK55    568  C~2lVA      
2015 05  18.34130  13 32 53.569  -06 54 06.83  24.8r 15GK55    568  C~2lVA      
2015 07  14.28829  13 31 04.879  -06 38 05.69        15GK55    568  C~2lVA      
2015 07  20.28135  13 31 12.800  -06 38 24.14  24.5r 15GK55    568  C~2lVA      
2016 02  04.53833  13 48 21.751  -07 42 14.06  24.8w 15GK55    568  C~2lVB      
2016 02  04.59350  13 48 21.726  -07 42 13.04  24.6w 15GK55    568  C~2lVB      
2016 02  04.60621  13 48 21.710  -07 42 12.87  24.4w 15GK55    568  C~2lVB      
2016 02  04.65482  13 48 21.681  -07 42 11.79  24.1w 15GK55    568  C~2lVB      
2016 02  11.58929  13 48 15.895  -07 39 47.07  25.1w 15GK55    568  C~2lVB      
2016 03  11.59678  13 46 57.547  -07 24 59.87  24.6w 15GK55    568  C~2lVB      
2016 04  03.46957  13 45 10.137  -07 09 48.79  24.4w 15GK55    568  C~2lVB      
2016 04  13.45991  13 44 16.734  -07 02 51.39  25.0w 15GK55    568  C~2lVB      
2016 04  14.36209  13 44 11.852  -07 02 13.98  24.6w 15GK55    568  C~2lVB      
2016 05  02.34774  13 42 35.082  -06 50 09.91  24.6w 15GK55    568  C~2lVB      
2016 05  07.35110  13 42 09.400  -06 47 02.41  24.7w 15GK55    568  C~2lVB      
2016 05  29.34365  13 40 31.609  -06 35 16.38  24.8w 15GK55    568  C~2lVB      
2016 06  04.40605  13 40 10.501  -06 32 44.06  24.6w 15GK55    568  C~2lVB      
2016 06  27.34644  13 39 21.170  -06 26 27.18  25.0w 15GK55    568  C~2lVB      
2016 07  07.33613  13 39 16.510  -06 25 28.30  25.8w 15GK55    568  C~2lVB      
2017 03  30.51119  13 54 05.489  -06 58 52.73        15GK55    568  C~2lVB      

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    -0.04       0.00     0.10
     2   0.0001     -1.63    -0.01       0.43     0.02
     3   0.0083   -125.80    -0.04      39.46    -0.03
     4   0.0793  -1730.51     0.14     362.11     0.14
     5   0.0795  -1734.30     0.07     362.50    -0.01
     6   0.0848  -1886.94     0.06     385.35     0.04
     7   0.1449  -3767.99     0.03     622.05    -0.01
     8   0.1449  -3768.37     0.02     622.11     0.02
     9   0.1500  -3936.33    -0.15     640.62     0.05
    10   0.1501  -3939.91     0.02     640.91    -0.04
    11   0.1501  -3940.34     0.03     641.02     0.03
    12   0.1501  -3940.73     0.08     641.09     0.05
    13   0.1501  -3941.06     0.20     641.11     0.03
    14   0.1502  -3941.69     0.01     641.05    -0.08
    15   0.1504  -3949.22     0.11     641.93     0.03
    16   0.1667  -4487.78     0.01     698.63    -0.22
    17   0.1669  -4494.72    -0.46     699.37    -0.11
    18   0.2457  -6895.84    -0.01     933.05    -0.02
    19   0.4016  -8756.70    -0.09    1237.33    -0.09
    20   0.4180  -8639.89     0.05    1263.29     0.04
    21   0.9636   7032.21    -0.00    3219.44     0.00
    22   0.9637   7031.50     0.05    3220.26     0.02
    23   0.9638   7031.21    -0.05    3220.33    -0.09
    24   0.9639   7030.42    -0.15    3221.19     0.05
    25   0.9829   6898.36     0.01    3325.82     0.03
    26   1.0623   5492.09    -0.08    3739.00    -0.05
    27   1.1249   3672.66     0.04    4018.10     0.06
    28   1.1523   2780.61    -0.03    4122.83     0.10
    29   1.1547   2699.32     0.10    4131.68    -0.01
    30   1.2040   1094.03    -0.06    4289.95     0.05
    31   1.2177    669.58     0.14    4327.33    -0.05
    32   1.2779   -944.20     0.05    4461.30     0.08
    33   1.2945  -1292.60    -0.05    4489.95    -0.15
    34   1.3573  -2114.56    -0.04    4576.12     0.04
    35   1.3847  -2200.63 (   0.10)   4605.96 (   0.53)
    36   2.1134  10901.38     0.02    7475.35    -0.03

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.

15GK55    quality flag:3

Type:         7:4EEE    7:4EEE    7:4EEE
Type:         7:4EII    7:4EII    7:4EII

axisobj        43.466    43.478    43.453
ecceobj         0.260     0.261     0.260
incobj         27.355    27.355    27.355
qmin           29.893    29.935    29.863
qmax           58.145    58.016    58.237
amean          43.724    43.724    43.724
amin           43.348    43.348    43.362
amax           44.201    44.223    44.218
emean           0.226     0.222     0.228
emin            0.120     0.109     0.126
emax            0.316     0.313     0.317
imean          28.364    28.446    28.311
imin           25.982    26.046    25.922
imax           30.490    30.590    30.427
excite_mean     0.530     0.530     0.530
fracstop        1.000     1.000     1.000
cjmean          2.749     2.748     2.749

libcent 0       181.4     180.5     182.3
libamp  0        54.9      70.9      44.6
libcent 1       186.5     186.6     185.6
libamp  1       105.5     114.6      96.9
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       146.9     153.6     144.6
kozaiamp        180.0     180.0     180.0