Orbit Fit and Astrometric record for 15GN55

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: 15GN55    
# Created Sat Dec  4 02:13:19 2021
# Orbit generated from Bernstein formalism
# Fitting     32 observations of     32
# Arc:   2.44y
# First observation: 2015/02/17
#  Last observation: 2017/07/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000019   0.008208   0.000003   0.001163   0.013975   0.000000
# Chi-squared of fit:     8.40 DOF:     58 RMS:  0.09
# Min/Max residuals:    -0.24    0.29
# Exact a, adot, b, bdot, g, gdot:
  9.125306E-06  8.174403E-03  2.009070E-06  1.160594E-03  1.395988E-02 -2.417557E-03
# Covariance matrix:
  2.0937E-13 -1.2454E-15 -6.1998E-15  2.0715E-14  2.0065E-13  7.8937E-12
 -1.2454E-15  1.1877E-13 -4.8104E-15  1.6685E-14  1.3577E-13  6.4275E-12
 -6.1998E-15 -4.8104E-15  1.0812E-13 -6.9144E-14 -1.3601E-14 -7.8751E-13
  2.0715E-14  1.6685E-14 -6.9144E-14  8.0061E-14  4.6502E-14  2.8664E-12
  2.0065E-13  1.3577E-13 -1.3601E-14  4.6502E-14  4.0573E-13  1.7841E-11
  7.8937E-12  6.4275E-12 -7.8751E-13  2.8664E-12  1.7841E-11  1.1189E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.842974 -158.065720    0.793472    0.018927   -0.583820  2457071.068908
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          237.83215 +/-     0.424
Argument of Peri:      164.76073 +/-     0.320
Long of Asc Node:      188.67184 +/-     0.003
Inclination:             8.30330 +/-     0.002
Eccentricity:         0.40907558 +/-    0.0012
Semi-Major Axis:     55.41028374 +/-    0.0680
Time of Perihelion: 2508196.1019 +/-     150.5
Perihelion:          32.74328968 +/-    0.0793
Aphelion:            78.07727780 +/-    0.1178
Period (y)              412.4713 +/-      0.76
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -67.25510953 +/-    0.0030
Ecliptic Y          -26.22663096 +/-    0.0012
Ecliptic Z            2.30391845 +/-    0.0001
Ecliptic XDOT         0.00104159 +/-    0.0000
Ecliptic YDOT        -0.00131295 +/-    0.0000
Ecliptic ZDOT         0.00021235 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   72.22460778 +/-    0.0029
Geocenter to KBO     71.63383202 +/-    0.0033
# Hcoef:  5.81

The following table shows the complete astrometric record for 15GN55. 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 (15GN55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.56813  13 23 52.775  -06 50 04.51  24.4r 15GN55    568  C~2lVB      
2015 02  17.60905  13 23 52.706  -06 50 03.92  24.4r 15GN55    568  C~2lVB      
2015 02  20.60184  13 23 48.051  -06 49 29.88  24.3r 15GN55    568  C~2lVB      
2015 03  18.54653  13 22 53.530  -06 43 18.41  24.0r 15GN55    568  C~2lVB      
2015 03  18.58746  13 22 53.428  -06 43 17.72  24.2r 15GN55    568  C~2lVB      
2015 03  20.55033  13 22 48.480  -06 42 45.35  24.4r 15GN55    568  C~2lVB      
2015 04  11.48481  13 21 49.200  -06 36 27.07  24.5r 15GN55    568  C~2lVB      
2015 04  13.34921  13 21 44.008  -06 35 54.74  24.3r 15GN55    568  C~2lVB      
2015 04  13.39016  13 21 43.889  -06 35 53.94  24.6r 15GN55    568  C~2lVB      
2015 04  13.45967  13 21 43.698  -06 35 52.87  24.3r 15GN55    568  C~2lVB      
2015 04  19.39003  13 21 27.188  -06 34 10.28  24.6r 15GN55    568  C~2lVB      
2015 05  18.25525  13 20 13.503  -06 26 45.23  24.2r 15GN55    568  C~2lVB      
2015 06  22.30724  13 19 18.837  -06 21 38.45  24.5r 15GN55    568  C~2lVB      
2015 07  20.26062  13 19 16.013  -06 21 48.19  24.4r 15GN55    568  C~2lVB      
2016 02  04.54710  13 25 59.823  -06 58 52.33  24.7w 15GN55    568  C~2lVB      
2016 02  10.53503  13 25 53.960  -06 58 03.51  24.4w 15GN55    568  C~2lVB      
2016 03  11.53623  13 25 00.698  -06 51 46.82  24.5w 15GN55    568  C~2lVB      
2016 04  03.42508  13 24 01.599  -06 45 24.05  24.5w 15GN55    568  C~2lVB      
2016 04  09.40482  13 23 44.964  -06 43 39.54  24.5w 15GN55    568  C~2lVB      
2016 05  01.35239  13 22 44.666  -06 37 28.96  24.6w 15GN55    568  C~2lVB      
2016 05  02.29500  13 22 42.180  -06 37 14.17  24.8w 15GN55    568  C~2lVB      
2016 05  06.30476  13 22 31.861  -06 36 12.03  24.5w 15GN55    568  C~2lVB      
2016 05  28.26791  13 21 42.805  -06 31 25.07  24.5w 15GN55    568  C~2lVB      
2016 06  04.34936  13 21 30.477  -06 30 15.68  24.8w 15GN55    568  C~2lVB      
2016 06  27.26867  13 21 05.572  -06 28 06.14  24.5w 15GN55    568  C~2lVB      
2016 07  06.30443  13 21 02.700  -06 27 58.06  24.7w 15GN55    568  C~2lVB      
2017 02  24.62428  13 27 24.739  -07 02 10.33        15GN55    568  C~2lVB      
2017 02  24.63510  13 27 24.719  -07 02 10.16        15GN55    568  C~2lVB      
2017 03  28.55556  13 26 11.132  -06 54 00.28        15GN55    568  C~2lVB      
2017 06  21.28313  13 23 01.307  -06 35 12.85  24.6w 15GN55    568  C~2lVB      
2017 07  26.25161  13 23 01.303  -06 35 50.65  23.9w 15GN55    568  C~2lVB      
2017 07  27.26646  13 23 02.242  -06 35 56.84        15GN55    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     0.03       0.00    -0.14
     2   0.0001     -1.17    -0.11       0.17    -0.05
     3   0.0083    -78.19    -0.06       6.00    -0.00
     4   0.0793   -970.20    -0.01      48.82     0.01
     5   0.0795   -971.87     0.01      48.90     0.04
     6   0.0848  -1052.33    -0.02      51.52     0.05
     7   0.1449  -2012.93     0.01      73.72     0.09
     8   0.1500  -2096.78     0.12      74.89    -0.04
     9   0.1501  -2098.72     0.05      74.97     0.03
    10   0.1503  -2101.76     0.19      74.91    -0.07
    11   0.1665  -2368.32     0.00      78.41     0.03
    12   0.2455  -3553.47    -0.19      81.67     0.03
    13   0.3415  -4424.28     0.05      61.85     0.03
    14   0.4180  -4459.71     0.00      37.08     0.06
    15   0.9637   1952.72     0.05     211.98    -0.04
    16   0.9801   1853.54    -0.09     224.97     0.02
    17   1.0622    977.24     0.07     280.66    -0.12
    18   1.1249     17.80     0.05     309.22     0.01
    19   1.1412   -251.09    -0.00     314.15    -0.06
    20   1.2013  -1222.82     0.18     324.04     0.15
    21   1.2039  -1262.71    -0.02     323.98    -0.03
    22   1.2149  -1428.55     0.01     324.43     0.20
    23   1.2750  -2213.92    -0.04     318.47    -0.01
    24   1.2944  -2410.29    -0.00     314.39    -0.03
    25   1.3572  -2803.07    -0.24     296.20    -0.09
    26   1.3819  -2845.81    -0.12     287.74    -0.05
    27   2.0207   3200.61    -0.03     496.16    -0.10
    28   2.0207   3200.27    -0.05     496.20    -0.07
    29   2.1081   2000.92    -0.05     545.65     0.02
    30   2.3401  -1043.31     0.07     542.64     0.01
    31   2.4358  -1029.30     0.05     507.53    -0.17
    32   2.4386  -1014.01     0.09     506.99     0.29

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.

15GN55    quality flag:3

Type:         5:2EEE    5:2EEE    5:2EEE

axisobj        55.027    55.228    54.834
ecceobj         0.418     0.422     0.414
incobj          8.371     8.371     8.372
qmin           31.878    31.812    31.996
qmax           80.295    80.312    80.483
amean          55.462    55.462    55.463
amin           54.739    54.765    54.610
amax           56.382    56.363    56.549
emean           0.413     0.414     0.411
emin            0.402     0.404     0.399
emax            0.425     0.426     0.424
imean           8.455     8.392     8.476
imin            8.085     8.085     8.078
imax            8.832     8.673     8.841
excite_mean     0.438     0.439     0.437
fracstop        1.000     1.000     1.000
cjmean          2.988     2.987     2.990

libcent 0       180.3     179.6     179.9
libamp  0        72.1      73.6     131.5
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       224.5     227.2     186.2
kozaiamp         69.0      69.8     179.9