Orbit Fit and Astrometric record for 15GJ55

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: 15GJ55    
# Created Fri Dec  3 02:13:16 2021
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000152   0.030629   0.000003  -0.001928   0.027472   0.000000
# Chi-squared of fit:     5.18 DOF:     50 RMS:  0.08
# Min/Max residuals:    -0.17    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.726634E-05  3.049751E-02 -1.304210E-06 -1.926034E-03  2.752681E-02  2.670951E-03
# Covariance matrix:
  1.9109E-13  1.2514E-14  3.5470E-17 -6.3649E-15  1.6095E-13  2.1239E-12
  1.2514E-14  4.8113E-13  2.8812E-15 -2.8501E-14  3.4064E-13  9.1800E-12
  3.5470E-17  2.8812E-15  1.1756E-13 -9.0869E-14  1.6196E-15  8.4171E-14
 -6.3649E-15 -2.8501E-14 -9.0869E-14  1.2772E-13 -2.4588E-14 -7.5871E-13
  1.6095E-13  3.4064E-13  1.6196E-15 -2.4588E-14  4.1479E-13  8.0249E-12
  2.1239E-12  9.1800E-12  8.4171E-14 -7.5871E-13  8.0249E-12  2.4347E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.626491 -154.230850    0.830532    0.015185   -0.529895  2457071.093388
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           18.17092 +/-     0.114
Argument of Peri:      129.73679 +/-     0.171
Long of Asc Node:       48.64238 +/-     0.004
Inclination:             3.90937 +/-     0.001
Eccentricity:         0.17546403 +/-    0.0003
Semi-Major Axis:     44.03808156 +/-    0.0048
Time of Perihelion: 2451682.6521 +/-      33.7
Perihelion:          36.31098208 +/-    0.0124
Aphelion:            51.76518104 +/-    0.0131
Period (y)              292.2475 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -33.54351889 +/-    0.0008
Ecliptic Y          -15.26968744 +/-    0.0004
Ecliptic Z            1.03108887 +/-    0.0000
Ecliptic XDOT         0.00107104 +/-    0.0000
Ecliptic YDOT        -0.00285505 +/-    0.0000
Ecliptic ZDOT        -0.00018386 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.86996282 +/-    0.0007
Geocenter to KBO     36.32821678 +/-    0.0008
# Hcoef:  8.29

The following table shows the complete astrometric record for 15GJ55. 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 (15GJ55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.59261  13 37 56.981  -08 26 33.84  24.0r 15GJ55    568  C~2lVA      
2015 02  17.63360  13 37 56.884  -08 26 33.27  23.9r 15GJ55    568  C~2lVA      
2015 02  20.62674  13 37 49.959  -08 25 49.24  24.0r 15GJ55    568  C~2lVA      
2015 03  18.57107  13 36 19.712  -08 16 46.58  24.1r 15GJ55    568  C~2lVA      
2015 03  18.61845  13 36 19.505  -08 16 45.37  24.3r 15GJ55    568  C~2lVA      
2015 03  20.57526  13 36 10.895  -08 15 54.96  23.7r 15GJ55    568  C~2lVA      
2015 04  11.50958  13 34 24.579  -08 05 46.08  23.9r 15GJ55    568  C~2lVA      
2015 04  13.37381  13 34 15.097  -08 04 52.69  24.5r 15GJ55    568  C~2lVA      
2015 04  13.41479  13 34 14.880  -08 04 51.47  23.8r 15GJ55    568  C~2lVA      
2015 04  13.51735  13 34 14.345  -08 04 48.57  23.8r 15GJ55    568  C~2lVA      
2015 04  19.41451  13 33 44.243  -08 02 00.21  23.7r 15GJ55    568  C~2lVA      
2015 04  19.54875  13 33 43.555  -08 01 56.55  22.7r 15GJ55    568  C~2lVA      
2015 05  18.33721  13 31 27.230  -07 49 39.60  23.9r 15GJ55    568  C~2lVA      
2015 07  20.27721  13 29 46.032  -07 43 30.06  24.0r 15GJ55    568  C~2lVA      
2016 02  04.61026  13 44 40.949  -09 12 27.55  24.5w 15GJ55    568  C~2lVA      
2016 02  11.59334  13 44 33.613  -09 11 36.10  24.0w 15GJ55    568  C~2lVA      
2016 03  11.60487  13 43 14.557  -09 03 38.98  24.3w 15GJ55    568  C~2lVA      
2016 04  03.47362  13 41 31.893  -08 53 53.94  24.2w 15GJ55    568  C~2lVA      
2016 04  09.45477  13 41 01.909  -08 51 06.66  24.3w 15GJ55    568  C~2lVA      
2016 05  02.33963  13 39 06.197  -08 40 34.67  24.3w 15GJ55    568  C~2lVA      
2016 05  07.34298  13 38 42.139  -08 38 26.41  24.0w 15GJ55    568  C~2lVA      
2016 05  29.32744  13 37 10.598  -08 30 35.56  23.5w 15GJ55    568  C~2lVA      
2016 06  04.38987  13 36 50.745  -08 28 59.65  24.2w 15GJ55    568  C~2lVA      
2016 06  27.32010  13 36 03.520  -08 25 44.89  24.2w 15GJ55    568  C~2lVA      
2016 06  27.32513  13 36 03.519  -08 25 45.04  24.6w 15GJ55    568  C~2lVA      
2016 07  07.31590  13 35 58.240  -08 25 51.05  24.3w 15GJ55    568  C~2lVA      
2017 02  27.64150  13 50 23.966  -09 51 15.36        15GJ55    568  C~2lVA      
2017 03  30.49709  13 48 22.953  -09 39 50.47  24.2w 15GJ55    568  C~2lVA      

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     0.04
     2   0.0001     -1.55    -0.00       0.01     0.02
     3   0.0083   -113.27    -0.04       3.84     0.11
     4   0.0793  -1558.26    -0.03      23.83    -0.04
     5   0.0795  -1561.56     0.02      23.84    -0.03
     6   0.0848  -1698.96     0.01      24.40     0.06
     7   0.1449  -3391.08    -0.17      17.47    -0.06
     8   0.1500  -3541.71     0.00      15.90    -0.07
     9   0.1501  -3545.16    -0.07      15.86    -0.05
    10   0.1504  -3553.62    -0.08      15.67    -0.10
    11   0.1665  -4031.46     0.10       9.51     0.01
    12   0.1669  -4042.32     0.27       9.19    -0.09
    13   0.2457  -6198.22    -0.08     -44.53     0.07
    14   0.4180  -7734.81    -0.01    -251.82     0.02
    15   0.9638   6579.87     0.02    -413.12     0.05
    16   0.9829   6459.91     0.03    -403.96    -0.00
    17   1.0623   5194.85    -0.15    -378.17     0.07
    18   1.1249   3564.38    -0.04    -378.88     0.08
    19   1.1413   3089.46     0.00    -382.84     0.03
    20   1.2040   1261.35     0.23    -412.43    -0.02
    21   1.2177    882.34     0.00    -421.84     0.06
    22   1.2779   -553.78     0.07    -474.66     0.02
    23   1.2944   -863.04    -0.02    -492.11    -0.05
    24   1.3572  -1586.65    -0.09    -565.02     0.05
    25   1.3572  -1586.61     0.04    -565.16    -0.07
    26   1.3846  -1657.41    -0.07    -599.22    -0.00
    27   2.0289  12162.24     0.00    -782.60    -0.08
    28   2.1134  10241.02    -0.01    -776.71    -0.01

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.

15GJ55    quality flag:2

Type:         7:4EEE  SCATNEAR    7:4EEE

axisobj        43.571    43.590    43.553
ecceobj         0.166     0.167     0.166
incobj          3.918     3.918     3.918
qmin           35.852    35.967    35.812
qmax           52.228    52.209    52.218
amean          43.727    43.650    43.727
amin           43.229    43.228    43.235
amax           44.286    44.289    44.259
emean           0.167     0.106     0.167
emin            0.153     0.060     0.153
emax            0.180     0.179     0.180
imean           2.339     1.399     2.678
imin            0.933     0.000     1.811
imax            3.404     3.390     3.614
excite_mean     0.172     0.110     0.174
fracstop        1.000     1.000     1.000
cjmean          3.062     3.081     3.062

libcent 0       179.7    -180.0     180.1
libamp  0       144.9    -180.0     124.0
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       176.0     167.3     185.9
kozaiamp        180.0     180.0     180.0