Orbit Fit and Astrometric record for 19GK185

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: 19GK185   
# Created Tue Apr  1 01:11:13 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   3.88y
# First observation: 2016/03/02
#  Last observation: 2020/01/19
Preliminary a, adot, b, bdot, g, gdot:
   0.000053   0.021514  -0.000002   0.002090   0.023456   0.000000
# Chi-squared of fit:     5.38 DOF:     30 RMS:  0.10
# Min/Max residuals:    -0.25    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.469066E-05  2.160608E-02  1.395413E-06  2.111640E-03  2.320523E-02 -9.441589E-04
# Covariance matrix:
  1.4654E-12 -8.0718E-13  1.2754E-14 -3.7890E-14 -3.8296E-13 -4.9402E-12
 -8.0718E-13  1.6329E-12 -4.8672E-14  1.3858E-13  1.7810E-12  1.8641E-11
  1.2754E-14 -4.8672E-14  1.3292E-12 -4.1549E-13 -5.8232E-14 -6.0597E-13
 -3.7890E-14  1.3858E-13 -4.1549E-13  1.4853E-13  1.6158E-13  1.7257E-12
 -3.8296E-13  1.7810E-12 -5.8232E-14  1.6158E-13  2.3546E-12  2.2154E-11
 -4.9402E-12  1.8641E-11 -6.0597E-13  1.7257E-12  2.2154E-11  2.3210E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -5.897484  154.146100   -0.128287   -0.100476   -0.974650  2457449.657877
# Heliocentric elements and errors
Epoch:              2457440.5000  =  2016/02/22
Mean Anomaly:          250.91268 +/-     0.481
Argument of Peri:       67.70356 +/-     0.459
Long of Asc Node:      200.09761 +/-     0.005
Inclination:             8.02049 +/-     0.001
Eccentricity:         0.04430383 +/-    0.0006
Semi-Major Axis:     43.36958081 +/-    0.0092
Time of Perihelion: 2489052.2120 +/-     139.0
Perihelion:          41.44814222 +/-    0.0276
Aphelion:            45.29101940 +/-    0.0279
Period (y)              285.6183 +/-      0.09
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.51691756 +/-    0.0026
Ecliptic Y           19.00219478 +/-    0.0012
Ecliptic Z           -4.42780923 +/-    0.0003
Ecliptic XDOT        -0.00103515 +/-    0.0000
Ecliptic YDOT        -0.00233816 +/-    0.0000
Ecliptic ZDOT         0.00025928 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.07125678 +/-    0.0024
Geocenter to KBO     43.09372884 +/-    0.0028
# Hcoef:  7.20

The following table shows the complete astrometric record for 19GK185. 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 (19GK185) followed by the observatory code and reference code for the source of the astrometry.

2016 03  02.157088 10 15 32.04   +04 29 21.6   23.6r 19GK185   W84  C~85KE      
2019 01  02.298293 10 33 40.04   +03 09 19.4   23.8g 19GK185   W84  C~85KE      
2019 04  06.285880 10 27 46.40   +03 44 30.8   23.1i 19GK185   T09  C~85KE      
2019 04  07.31764  10 27 43.18   +03 44 56.5   24.6g 19GK185   T09  C~85KE      
2019 04  07.34315  10 27 43.10   +03 44 57.2   24.8g 19GK185   T09  C~85KE      
2019 04  07.34524  10 27 43.09   +03 44 57.3   24.7g 19GK185   T09  C~85KE      
2019 04  07.36664  10 27 43.02   +03 44 57.7   24.6g 19GK185   T09  C~85KE      
2019 04  08.25500  10 27 40.32   +03 45 19.7   23.8y 19GK185   T09  C~85KE      
2019 04  08.28056  10 27 40.25   +03 45 20.4   23.8y 19GK185   T09  C~85KE      
2019 04  08.31368  10 27 40.16   +03 45 21.0   23.8y 19GK185   T09  C~85KE      
2019 04  08.34415  10 27 40.06   +03 45 21.7   24.4y 19GK185   T09  C~85KE      
2019 05  08.343994 10 26 41.28   +03 55 10.2   22.9i 19GK185   T09  C~85KE      
2019 05  09.398121 10 26 40.47   +03 55 24.4   23.2i 19GK185   T09  C~85KE      
2019 05  31.294612 10 26 44.78   +03 58 21.9         19GK185   T09  C~85KE      
2019 06  08.297250 10 26 56.32   +03 58 27.7   22.6z 19GK185   T09  C~85KE      
2019 06  08.326765 10 26 56.36   +03 58 27.7   22.6z 19GK185   T09  C~85KE      
2019 12  31.633060 10 38 30.05   +02 48 52.5   23.0z 19GK185   T09  C~85KE      
2020 01  19.414345 10 37 41.52   +02 52 10.0   22.7z 19GK185   T09  C~85KE      

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     0.01       0.00     0.01
     2   2.8368  16956.14     0.09    1415.26    -0.04
     3   3.0941  11228.80     0.14    1457.28     0.08
     4   3.0969  11174.40    -0.07    1463.75    -0.03
     5   3.0970  11173.03    -0.08    1463.97     0.04
     6   3.0970  11172.85    -0.15    1464.01     0.06
     7   3.0971  11171.73    -0.14    1464.00    -0.07
     8   3.0995  11125.95    -0.25    1469.85    -0.04
     9   3.0996  11124.72    -0.15    1470.12     0.08
    10   3.0997  11123.24     0.10    1470.19    -0.05
    11   3.0998  11121.59     0.04    1470.30    -0.13
    12   3.1819  10085.65     0.12    1699.98     0.06
    13   3.1848  10069.17     0.06    1708.83    -0.01
    14   3.2447  10064.98     0.15    1897.87     0.04
    15   3.2666  10224.23     0.15    1966.00     0.00
    16   3.2667  10224.79    -0.01    1966.21    -0.02
    17   3.8316  21488.21     0.12    1859.93     0.09
    18   3.8830  20731.31    -0.13    1777.71    -0.07

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.

19GK185    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.097    43.119    43.074
ecceobj         0.044     0.045     0.043
incobj          8.047     8.047     8.047
qmin           40.631    40.571    40.656
qmax           45.894    45.974    45.819
amean          43.161    43.185    43.138
amin           42.833    42.853    42.812
amax           43.508    43.526    43.475
emean           0.042     0.043     0.041
emin            0.028     0.029     0.027
emax            0.055     0.056     0.054
imean           8.880     8.875     8.886
imin            8.225     8.220     8.226
imax            9.575     9.573     9.583
excite_mean     0.160     0.160     0.160
fracstop        1.000     1.000     1.000
cjmean          3.061     3.061     3.061

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       178.3     178.4     178.0
kozaiamp        180.0     180.0     179.9