Orbit Fit and Astrometric record for 15GR65

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: 15GR65    
# Created Fri Dec  3 02:13:20 2021
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000067   0.028972   0.000002   0.000334   0.027754   0.000000
# Chi-squared of fit:     7.64 DOF:     36 RMS:  0.11
# Min/Max residuals:    -0.23    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.494589E-05  2.858982E-02  3.987990E-07  3.247895E-04  2.764245E-02 -7.711973E-03
# Covariance matrix:
  2.7475E-13  3.8473E-14 -2.0695E-15  2.1319E-15  2.3259E-13  2.4824E-12
  3.8473E-14  6.0727E-13 -4.6441E-15  1.1767E-14  3.9489E-13  1.3900E-11
 -2.0695E-15 -4.6441E-15  1.3180E-13 -9.4429E-14 -4.7833E-15 -1.2778E-13
  2.1319E-15  1.1767E-14 -9.4429E-14  1.4061E-13  8.5626E-15  3.6722E-13
  2.3259E-13  3.9489E-13 -4.7833E-15  8.5626E-15  4.7143E-13  1.0074E-11
  2.4824E-12  1.3900E-11 -1.2778E-13  3.6722E-13  1.0074E-11  4.3432E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.918345 -153.954366    0.833080    0.017750   -0.525799  2457071.093388
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          299.81679 +/-     0.059
Argument of Peri:      163.04593 +/-     0.023
Long of Asc Node:      134.74102 +/-     0.020
Inclination:             2.01146 +/-     0.000
Eccentricity:         0.28785407 +/-    0.0007
Semi-Major Axis:     39.42125120 +/-    0.0177
Time of Perihelion: 2472184.0637 +/-      10.9
Perihelion:          28.07368368 +/-    0.0312
Aphelion:            50.76881871 +/-    0.0366
Period (y)              247.5163 +/-      0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -33.32537894 +/-    0.0008
Ecliptic Y          -15.35802201 +/-    0.0004
Ecliptic Z            1.21102386 +/-    0.0000
Ecliptic XDOT         0.00192655 +/-    0.0000
Ecliptic YDOT        -0.00221401 +/-    0.0000
Ecliptic ZDOT         0.00000667 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.71397963 +/-    0.0008
Geocenter to KBO     36.17623704 +/-    0.0009
# Hcoef:  9.02

The following table shows the complete astrometric record for 15GR65. 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 (15GR65) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.59261  13 39 25.083  -08 16 14.06  24.9r 15GR65    568  C~4n9b      
2015 02  17.63360  13 39 24.975  -08 16 13.39  24.6r 15GR65    568  C~4n9b      
2015 03  18.57107  13 37 46.958  -08 05 31.87  24.8r 15GR65    568  C~4n9b      
2015 03  18.61845  13 37 46.740  -08 05 30.54  24.6r 15GR65    568  C~4n9b      
2015 03  20.57526  13 37 38.034  -08 04 36.61  24.6r 15GR65    568  C~4n9b      
2015 04  11.50958  13 35 50.411  -07 53 47.34  24.2r 15GR65    568  C~4n9b      
2015 04  13.37381  13 35 40.769  -07 52 50.52  24.7r 15GR65    568  C~4n9b      
2015 04  13.41478  13 35 40.555  -07 52 49.42  24.4r 15GR65    568  C~4n9b      
2015 04  13.51734  13 35 40.010  -07 52 46.20  24.6r 15GR65    568  C~4n9b      
2015 05  18.33721  13 32 49.756  -07 36 38.09  24.8r 15GR65    568  C~4n9b      
2015 06  22.33199  13 31 05.822  -07 27 53.37  25.4r 15GR65    568  C~4n9b      
2015 07  14.28421  13 30 56.652  -07 28 07.93  24.6r 15GR65    568  C~4n9b      
2015 07  20.27720  13 31 02.480  -07 29 01.31  24.8r 15GR65    568  C~4n9b      
2016 04  03.47362  13 42 47.233  -08 32 35.94  24.6w 15GR65    568  C~4n9b      
2016 04  09.45477  13 42 16.591  -08 29 36.04  24.8w 15GR65    568  C~4n9b      
2016 05  01.46152  13 40 22.472  -08 18 42.83  24.5w 15GR65    568  C~4n9b      
2016 05  02.33557  13 40 18.071  -08 18 18.58  25.1w 15GR65    568  C~4n9b      
2016 05  07.33893  13 39 53.371  -08 16 00.96  24.5w 15GR65    568  C~4n9b      
2016 06  27.33817  13 37 08.652  -08 02 07.02  24.7w 15GR65    568  C~4n9b      
2017 03  30.49709  13 49 35.771  -09 10 00.02  24.8w 15GR65    568  C~4n9b      
2017 06  25.27772  13 43 29.490  -08 37 11.41  24.3w 15GR65    568  C~4n9b      

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     0.29       0.00    -0.04
     2   0.0001     -1.74     0.08       0.05    -0.10
     3   0.0793  -1590.56    -0.02      71.90     0.07
     4   0.0795  -1594.06    -0.11      71.97     0.07
     5   0.0848  -1734.11    -0.13      75.42     0.01
     6   0.1449  -3459.71     0.04     100.68     0.07
     7   0.1500  -3613.87    -0.12     101.59     0.02
     8   0.1501  -3617.24    -0.04     101.46    -0.11
     9   0.1504  -3625.95    -0.13     101.52    -0.04
    10   0.2457  -6336.88    -0.07      81.93    -0.08
    11   0.3415  -7969.25     0.06       5.75     0.15
    12   0.4016  -8091.04     0.18     -57.73     0.11
    13   0.4180  -7990.69    -0.01     -75.72    -0.00
    14   1.1249   3152.24    -0.05     164.32    -0.00
    15   1.1413   2663.30    -0.05     168.89    -0.16
    16   1.2016    848.13     0.13     168.65     0.17
    17   1.2040    778.46     0.00     167.71    -0.23
    18   1.2176    386.86    -0.10     163.80     0.12
    19   1.3573  -2195.09     0.04      56.74    -0.03
    20   2.1134   9616.09     0.06     230.00    -0.13
    21   2.3510   3836.31    -0.05     132.16     0.15

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.

15GR65    quality flag:3

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

axisobj        39.096    39.137    39.055
ecceobj         0.289     0.291     0.287
incobj          2.015     2.014     2.015
qmin           27.348    27.248    27.402
qmax           52.270    52.345    52.368
amean          39.455    39.455    39.455
amin           38.959    38.973    38.928
amax           40.055    40.037    40.111
emean           0.292     0.294     0.291
emin            0.280     0.281     0.278
emax            0.307     0.308     0.306
imean           1.173     1.159     1.202
imin            0.888     0.889     0.820
imax            1.530     1.474     1.586
excite_mean     0.293     0.295     0.291
fracstop        1.000     1.000     1.000
cjmean          2.952     2.951     2.953

libcent 0       179.6     179.9     179.8
libamp  0        93.4      86.9     114.4
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       114.4     128.1     158.5
kozaiamp        110.1     179.9      82.0