Orbit Fit and Astrometric record for 15GJ56

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: 15GJ56    
# Created Sun Nov 24 02:10:16 2024
# Orbit generated from Bernstein formalism
# Fitting     38 observations of     39
# Arc:   2.34y
# First observation: 2015/02/17
#  Last observation: 2017/06/21
Preliminary a, adot, b, bdot, g, gdot:
  -0.000088   0.022434   0.000003  -0.001340   0.023315   0.000000
# Chi-squared of fit:    11.85 DOF:     70 RMS:  0.10
# Min/Max residuals:    -0.24    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.487586E-05  2.233354E-02 -4.909967E-07 -1.333630E-03  2.336030E-02 -1.090735E-03
# Covariance matrix:
  1.7902E-13 -1.0222E-15  8.2000E-16 -5.4182E-15  1.3653E-13  2.1666E-12
 -1.0222E-15  2.4020E-13  3.1546E-15 -1.5697E-14  1.5196E-13  6.1489E-12
  8.2000E-16  3.1546E-15  8.4102E-14 -6.2386E-14  2.6257E-15  1.2588E-13
 -5.4182E-15 -1.5697E-14 -6.2386E-14  8.5949E-14 -1.4515E-14 -6.2182E-13
  1.3653E-13  1.5196E-13  2.6257E-15 -1.4515E-14  2.3160E-13  5.7337E-12
  2.1666E-12  6.1489E-12  1.2588E-13 -6.2182E-13  5.7337E-12  2.4343E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.296523 -157.933675    0.795626    0.013299   -0.581030  2457070.990628
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          285.49169 +/-     0.045
Argument of Peri:      241.30153 +/-     0.105
Long of Asc Node:       41.63709 +/-     0.004
Inclination:             3.62657 +/-     0.001
Eccentricity:         0.06621219 +/-    0.0007
Semi-Major Axis:     43.99324927 +/-    0.0049
Time of Perihelion: 2479129.1890 +/-      12.7
Perihelion:          41.08035990 +/-    0.0309
Aphelion:            46.90613864 +/-    0.0310
Period (y)              291.8013 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.50212705 +/-    0.0008
Ecliptic Y          -15.55883585 +/-    0.0003
Ecliptic Z            0.96856665 +/-    0.0000
Ecliptic XDOT         0.00109486 +/-    0.0000
Ecliptic YDOT        -0.00238466 +/-    0.0000
Ecliptic ZDOT        -0.00015906 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.39859203 +/-    0.0008
Geocenter to KBO     42.80766896 +/-    0.0009
# Hcoef:  8.15

The following table shows the complete astrometric record for 15GJ56. 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 (15GJ56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.48985  13 23 33.290  -07 23 27.42  24.6r 15GJ56    568  C~2nvR      
2015 02  17.53111  13 23 33.200  -07 23 26.76  24.2r 15GJ56    568  C~2nvR      
2015 02  20.46189  13 23 26.316  -07 22 43.42  24.4r 15GJ56    568  C~2nvR      
2015 03  18.45830  13 22 01.335  -07 14 04.72  24.5r 15GJ56    568  C~2nvR      
2015 03  18.50960  13 22 01.129  -07 14 03.53  24.7r 15GJ56    568  C~2nvR      
2015 03  20.51135  13 21 53.153  -07 13 15.88  24.5r 15GJ56    568  C~2nvR      
2015 04  11.40216  13 20 19.381  -07 04 02.34  24.3r 15GJ56    568  C~2nvR      
2015 04  12.35479  13 20 15.140  -07 03 37.99  24.4r 15GJ56    568  C~2nvR      
2015 04  12.39573  13 20 14.947  -07 03 37.12  24.6r 15GJ56    568  C~2nvR      
2015 04  12.44139  13 20 14.742  -07 03 35.70  24.6r 15GJ56    568  C~2nvR      
2015 04  14.45255  13 20 05.828  -07 02 44.08  24.2r 15GJ56    568  C~2nvR      
2015 04  16.39045  13 19 57.264  -07 01 54.54  24.5r 15GJ56    568  C~2nvR      
2015 04  18.41130  13 19 48.357  -07 01 03.20  24.6r 15GJ56    568  C~2nvR      
2015 04  18.45422  13 19 48.170  -07 01 01.98  24.6r 15GJ56    568  C~2nvR      
2015 05  16.25241  13 17 55.416  -06 50 25.20  24.1r 15GJ56    568  C~2nvR      
2015 05  25.36134  13 17 25.456  -06 47 43.09  24.6r 15GJ56    568  C~2nvR      
2015 05  25.40527  13 17 25.316  -06 47 42.39  24.2r 15GJ56    568  C~2nvR      
2015 06  21.31362  13 16 28.786  -06 43 05.73  24.6r 15GJ56    568  C~2nvR      
2015 06  22.27001  13 16 27.787  -06 43 02.23  24.5r 15GJ56    568  C~2nvR      
2015 07  12.26411  13 16 24.083  -06 43 33.22  24.6r 15GJ56    568  C~2nvR      
2015 07  15.25415  13 16 26.427  -06 43 55.01  24.6r 15GJ56    568  C~2nvR      
2015 07  19.25345  13 16 30.705  -06 44 31.90  24.6r 15GJ56    568  C~2nvR      
2016 02  04.55519  13 28 36.489  -07 58 32.41  24.8w 15GJ56    568  C~2nvR      
2016 02  10.54313  13 28 28.589  -07 57 40.31  24.4w 15GJ56    568  C~2nvR      
2016 03  11.53623  13 27 08.338  -07 49 29.12  24.6w 15GJ56    568  C~2nvR      
2016 04  03.42508  13 25 35.353  -07 40 21.95  24.6w 15GJ56    568  C~2nvR      
2016 04  09.40482  13 25 08.986  -07 37 49.23  24.7w 15GJ56    568  C~2nvR      
2016 05  01.35644  13 23 33.261  -07 28 43.71  24.5w 15GJ56    568  C~2nvR      
2016 05  02.29905  13 23 29.348  -07 28 21.53  24.7w 15GJ56    568  C~2nvR      
2016 05  06.30882  13 23 13.029  -07 26 50.16  24.9w 15GJ56    568  C~2nvR      
2016 05  28.27599  13 21 56.321  -07 19 53.43  24.7w 15GJ56    568  C~2nvR      
2016 05  28.28814  13 21 56.284  -07 19 53.31  24.8w 15GJ56    568  C~2nvR      
2016 06  04.35749  13 21 37.489  -07 18 16.48  24.6w 15GJ56    568  C~2nvR      
2016 06  27.26867  13 21 01.819  -07 15 38.81  25.0w 15GJ56    568  C~2nvR      
2016 07  06.30443  13 20 59.354  -07 15 47.27  25.1w 15GJ56    568  C~2nvR      
2017 02  24.62769  13 32 40.848  -08 27 08.48        15GJ56    568  C~2nvR      
2017 02  24.63851  13 32 40.810  -08 27 08.37        15GJ56    568  C~2nvR      
2017 03  28.56968  13 30 47.552  -08 16 01.55        15GJ56    568  C~2nvR      
2017 06  21.28782  13 25 48.397  -07 48 46.58  24.6w 15GJ56    568  C~2nvR      

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     0.05       0.00    -0.08
     2   0.0001     -1.49     0.09       0.12     0.02
     3   0.0081   -112.66     0.04       2.28    -0.07
     4   0.0793  -1479.27     0.00      13.18     0.03
     5   0.0795  -1482.56     0.02      13.15     0.01
     6   0.0849  -1610.46    -0.09      13.15    -0.04
     7   0.1449  -3112.07 (   0.32)      6.19 (   0.48)
     8   0.1475  -3179.75     0.03       5.20     0.16
     9   0.1476  -3182.74    -0.02       4.93    -0.06
    10   0.1477  -3186.10    -0.10       5.11     0.17
    11   0.1532  -3328.51    -0.18       3.44     0.04
    12   0.1585  -3465.32    -0.17       1.77    -0.04
    13   0.1641  -3607.54    -0.09      -0.14    -0.14
    14   0.1642  -3610.58    -0.07      -0.05     0.01
    15   0.2403  -5406.71     0.13     -37.61    -0.12
    16   0.2652  -5881.53     0.10     -54.50    -0.05
    17   0.2653  -5883.72     0.05     -54.63    -0.08
    18   0.3390  -6768.91     0.09    -113.99     0.05
    19   0.3416  -6784.04     0.13    -116.33    -0.01
    20   0.3964  -6823.60    -0.05    -165.79    -0.02
    21   0.4046  -6783.01     0.05    -172.89     0.36
    22   0.4155  -6710.02    -0.06    -183.17     0.03
    23   0.9639   4967.19    -0.09    -286.00    -0.03
    24   0.9803   4838.82     0.07    -280.88    -0.02
    25   1.0624   3548.81     0.09    -264.92     0.14
    26   1.1251   2062.12    -0.05    -268.29    -0.01
    27   1.1415   1641.42     0.06    -271.79    -0.07
    28   1.2016    117.17     0.20    -293.79    -0.24
    29   1.2041     54.90     0.03    -294.83    -0.05
    30   1.2151   -204.38     0.03    -300.26     0.14
    31   1.2753  -1418.59     0.00    -338.23     0.04
    32   1.2753  -1419.15     0.02    -338.32    -0.02
    33   1.2946  -1714.74    -0.03    -352.67     0.06
    34   1.3574  -2266.04    -0.08    -404.28    -0.08
    35   1.3821  -2296.92    -0.13    -425.81    -0.08
    36   2.0209   8976.57    -0.02    -547.70     0.01
    37   2.0209   8976.01    -0.11    -547.80    -0.10
    38   2.1084   7164.96     0.14    -544.63     0.23
    39   2.3403   2429.25    -0.07    -665.17    -0.06

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.

15GJ56    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.589    43.600    43.577
ecceobj         0.067     0.068     0.066
incobj          3.639     3.639     3.639
qmin           40.345    40.293    40.364
qmax           47.688    47.754    47.564
amean          43.874    43.886    43.863
amin           43.527    43.525    43.524
amax           44.235    44.253    44.216
emean           0.060     0.062     0.059
emin            0.044     0.045     0.042
emax            0.078     0.079     0.076
imean           2.643     2.642     2.644
imin            1.853     1.851     1.855
imax            3.358     3.357     3.358
excite_mean     0.076     0.077     0.075
fracstop        1.000     1.000     1.000
cjmean          3.093     3.093     3.093

libcent 0      -180.0    -180.0    -180.0
libamp  0      -180.0    -180.0    -180.0
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       187.2     187.3     187.1
kozaiamp        180.0     180.0     180.0