Orbit Fit and Astrometric record for 15GM54

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: 15GM54    
# Created Thu Dec  9 02:13:12 2021
# Orbit generated from Bernstein formalism
# Fitting     35 observations of     35
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000201   0.025587   0.000005   0.004124   0.026014   0.000000
# Chi-squared of fit:     4.20 DOF:     64 RMS:  0.06
# Min/Max residuals:    -0.13    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.528030E-05  2.560775E-02  2.633625E-06  4.143424E-03  2.623026E-02  6.812552E-03
# Covariance matrix:
  2.0337E-13 -2.2237E-14 -2.9712E-15  1.4607E-14  1.4505E-13  2.0711E-12
 -2.2237E-14  2.6676E-13 -8.7955E-15  4.2353E-14  1.5089E-13  5.9687E-12
 -2.9712E-15 -8.7955E-15  9.9679E-14 -8.4460E-14 -8.3104E-15 -3.5359E-13
  1.4607E-14  4.2353E-14 -8.4460E-14  1.2947E-13  4.0333E-14  1.7015E-12
  1.4505E-13  1.5089E-13 -8.3104E-15  4.0333E-14  2.4179E-13  5.6973E-12
  2.0711E-12  5.9687E-12 -3.5359E-13  1.7015E-12  5.6973E-12  2.3973E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.218751 -153.861147    0.834702   -0.001852   -0.523513  2457071.011078
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           69.91346 +/-     0.063
Argument of Peri:      261.49595 +/-     0.023
Long of Asc Node:      206.24143 +/-     0.000
Inclination:             9.12910 +/-     0.001
Eccentricity:         0.23642625 +/-    0.0006
Semi-Major Axis:     39.74360317 +/-    0.0115
Time of Perihelion: 2439297.6287 +/-      14.2
Perihelion:          30.34717205 +/-    0.0241
Aphelion:            49.14003429 +/-    0.0266
Period (y)              250.5585 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.06515131 +/-    0.0006
Ecliptic Y          -16.27650926 +/-    0.0003
Ecliptic Z           -0.14545864 +/-    0.0000
Ecliptic XDOT         0.00053404 +/-    0.0000
Ecliptic YDOT        -0.00271907 +/-    0.0000
Ecliptic ZDOT         0.00042986 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.65890257 +/-    0.0006
Geocenter to KBO     38.12390090 +/-    0.0007
# Hcoef:  8.18

The following table shows the complete astrometric record for 15GM54. 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 (15GM54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.51030  13 36 38.067  -10 17 47.28  23.8r 15GM54    568  C~2lV7      
2015 02  17.55169  13 36 37.970  -10 17 46.65  24.1r 15GM54    568  C~2lV7      
2015 02  20.48249  13 36 31.311  -10 17 01.91  24.1r 15GM54    568  C~2lV7      
2015 03  18.48843  13 35 03.275  -10 07 35.70  24.2r 15GM54    568  C~2lV7      
2015 03  18.53000  13 35 03.095  -10 07 34.54  24.1r 15GM54    568  C~2lV7      
2015 04  11.46838  13 33 11.833  -09 55 52.61  23.9r 15GM54    568  C~2lV7      
2015 04  12.37527  13 33 07.384  -09 55 24.57  23.6r 15GM54    568  C~2lV7      
2015 04  12.41621  13 33 07.174  -09 55 23.20  24.0r 15GM54    568  C~2lV7      
2015 04  12.46324  13 33 06.942  -09 55 21.76  23.9r 15GM54    568  C~2lV7      
2015 04  18.43380  13 32 37.559  -09 52 16.10  23.7r 15GM54    568  C~2lV7      
2015 04  18.48152  13 32 37.319  -09 52 14.61  23.8r 15GM54    568  C~2lV7      
2015 05  16.28057  13 30 29.257  -09 38 36.07  24.0r 15GM54    568  C~2lV7      
2015 05  25.38456  13 29 54.415  -09 34 48.46  24.1r 15GM54    568  C~2lV7      
2015 05  25.44235  13 29 54.212  -09 34 47.05  24.1r 15GM54    568  C~2lV7      
2015 06  21.33417  13 28 45.920  -09 26 54.53  23.8r 15GM54    568  C~2lV7      
2015 06  22.29068  13 28 44.605  -09 26 44.12  24.2r 15GM54    568  C~2lV7      
2015 07  12.28470  13 28 36.302  -09 25 01.58  24.4r 15GM54    568  C~2lV7      
2015 07  15.27496  13 28 38.305  -09 25 05.07  24.3r 15GM54    568  C~2lV7      
2015 07  19.27455  13 28 42.319  -09 25 18.10  24.2r 15GM54    568  C~2lV7      
2016 02  04.61835  13 42 49.431  -10 38 27.94  24.4w 15GM54    568  C~2lV7      
2016 02  11.60157  13 42 41.785  -10 37 27.40  24.5w 15GM54    568  C~2lV7      
2016 03  11.59247  13 41 24.130  -10 28 54.32  24.4w 15GM54    568  C~2lV7      
2016 04  03.46553  13 39 44.938  -10 18 31.67  24.2w 15GM54    568  C~2lV7      
2016 04  09.44668  13 39 16.095  -10 15 31.99  24.3w 15GM54    568  C~2lV7      
2016 05  02.34368  13 37 25.078  -10 03 58.83  24.2w 15GM54    568  C~2lV7      
2016 05  02.35991  13 37 25.002  -10 03 58.39  24.3w 15GM54    568  C~2lV7      
2016 05  07.34704  13 37 02.066  -10 01 34.47  24.2w 15GM54    568  C~2lV7      
2016 05  07.36327  13 37 02.004  -10 01 33.87  24.4w 15GM54    568  C~2lV7      
2016 05  28.31649  13 35 38.045  -09 52 39.74  23.8w 15GM54    568  C~2lV7      
2016 05  29.32340  13 35 34.659  -09 52 17.76  24.4w 15GM54    568  C~2lV7      
2016 06  04.38582  13 35 15.723  -09 50 14.09  24.4w 15GM54    568  C~2lV7      
2016 06  27.31141  13 34 30.740  -09 45 00.59  24.3w 15GM54    568  C~2lV7      
2016 07  07.30770  13 34 25.731  -09 44 08.76  24.1w 15GM54    568  C~2lV7      
2017 02  27.64549  13 47 55.989  -10 51 12.74        15GM54    568  C~2lV7      
2017 03  30.49241  13 45 58.778  -10 38 52.59  24.5w 15GM54    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     0.03       0.00    -0.03
     2   0.0001     -1.56    -0.04       0.07    -0.02
     3   0.0081   -109.38     0.05       6.08    -0.01
     4   0.0793  -1525.97     0.00      61.06    -0.04
     5   0.0795  -1528.87    -0.03      61.17    -0.00
     6   0.1450  -3315.36    -0.02     115.33    -0.00
     7   0.1475  -3386.81    -0.02     117.41    -0.08
     8   0.1476  -3390.20    -0.13     117.55    -0.01
     9   0.1477  -3393.92    -0.07     117.64    -0.01
    10   0.1641  -3866.08     0.08     131.70     0.02
    11   0.1642  -3869.92     0.07     131.79     0.02
    12   0.2403  -5932.52     0.10     199.51     0.20
    13   0.2652  -6495.91    -0.00     221.86    -0.04
    14   0.2654  -6499.22     0.07     222.07     0.04
    15   0.3390  -7613.81     0.03     289.66    -0.05
    16   0.3416  -7635.77     0.05     292.17     0.03
    17   0.3964  -7787.98    -0.05     342.26    -0.08
    18   0.4046  -7759.10    -0.12     349.94     0.15
    19   0.4155  -7699.00    -0.02     359.72    -0.03
    20   0.9640   5557.88     0.08     818.68     0.02
    21   0.9831   5430.86    -0.02     834.79    -0.02
    22   1.0625   4177.19    -0.12     902.59    -0.02
    23   1.1251   2587.25    -0.01     956.50     0.02
    24   1.1415   2125.33    -0.06     970.44    -0.04
    25   1.2042    346.37     0.07    1023.77     0.05
    26   1.2042    345.16     0.10    1023.77     0.02
    27   1.2179    -22.74    -0.01    1035.09    -0.08
    28   1.2179    -23.81     0.12    1035.32     0.11
    29   1.2753  -1373.57    -0.06    1082.53    -0.05
    30   1.2781  -1428.17     0.03    1084.81    -0.01
    31   1.2947  -1733.86    -0.07    1098.20    -0.02
    32   1.3574  -2467.37    -0.06    1148.05    -0.04
    33   1.3848  -2555.24     0.03    1169.33    -0.04
    34   2.0291  10058.27    -0.03    1715.62     0.04
    35   2.1136   8176.97     0.02    1793.57     0.00

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.

15GM54    quality flag:3

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

axisobj        39.396    39.428    39.365
ecceobj         0.235     0.236     0.233
incobj          9.165     9.165     9.165
qmin           29.283    29.598    29.061
qmax           50.266    50.133    50.324
amean          39.455    39.456    39.455
amin           38.944    38.928    38.976
amax           40.048    40.078    40.028
emean           0.235     0.227     0.238
emin            0.212     0.205     0.213
emax            0.257     0.251     0.262
imean           9.318    10.056     8.971
imin            8.622     9.297     7.909
imax           10.153    11.107    10.158
excite_mean     0.286     0.287     0.285
fracstop        1.000     1.000     1.000
cjmean          2.959     2.958     2.959

libcent 0       179.9     179.4     179.6
libamp  0       102.8     125.1      93.2
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       269.9     272.3     269.1
kozaiamp         30.4      32.5      34.6