Orbit Fit and Astrometric record for 19GT187

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: 19GT187   
# Created Thu Apr  3 01:11:18 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   1.14y
# First observation: 2018/02/11
#  Last observation: 2019/04/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000008   0.024813   0.000004  -0.004328   0.024755   0.000000
# Chi-squared of fit:     3.03 DOF:     18 RMS:  0.09
# Min/Max residuals:    -0.30    0.13
# Exact a, adot, b, bdot, g, gdot:
  1.582223E-05  2.469112E-02 -2.639914E-06 -4.290663E-03  2.468858E-02 -3.205727E-03
# Covariance matrix:
  1.4615E-12  5.8901E-13  3.1008E-14 -4.1487E-13  1.7050E-12  8.1801E-11
  5.8901E-13  4.5183E-12  8.8622E-14 -1.1689E-12  3.9936E-12  2.3180E-10
  3.1008E-14  8.8622E-14  8.5895E-13 -8.1041E-13  9.1482E-14  5.6597E-12
 -4.1487E-13 -1.1689E-12 -8.1041E-13  1.2052E-12 -1.2203E-12 -7.4382E-11
  1.7050E-12  3.9936E-12  9.1482E-14 -1.2203E-12  4.8356E-12  2.4090E-10
  8.1801E-11  2.3180E-10  5.6597E-12 -7.4382E-11  2.4090E-10  1.4771E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.482304 -178.752249    0.622682    0.046842   -0.767860  2458161.144004
# Heliocentric elements and errors
Epoch:              2458160.5000  =  2018/02/11
Mean Anomaly:          313.05386 +/-     0.362
Argument of Peri:      224.44220 +/-     0.785
Long of Asc Node:       19.40246 +/-     0.004
Inclination:            10.38614 +/-     0.002
Eccentricity:         0.17366983 +/-    0.0047
Semi-Major Axis:     45.83218968 +/-    0.0779
Time of Perihelion: 2472939.7269 +/-     107.6
Perihelion:          37.87252120 +/-    0.2234
Aphelion:            53.79185816 +/-    0.2326
Period (y)              310.2874 +/-      0.79
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.20439969 +/-    0.0036
Ecliptic Y           -0.28157544 +/-    0.0001
Ecliptic Z            2.46014996 +/-    0.0002
Ecliptic XDOT         0.00039163 +/-    0.0000
Ecliptic YDOT        -0.00273510 +/-    0.0000
Ecliptic ZDOT        -0.00049668 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.27873759 +/-    0.0036
Geocenter to KBO     40.50456481 +/-    0.0036
# Hcoef:  8.68

The following table shows the complete astrometric record for 19GT187. 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 (19GT187) followed by the observatory code and reference code for the source of the astrometry.

2018 02  11.643203 12 10 07.33   +02 41 55.0         19GT187   T09  C~8Aj1      
2018 04  22.367255 12 05 10.18   +03 11 30.9         19GT187   T09  C~8Aj1      
2019 02  05.587078 12 15 16.02   +01 52 10.5         19GT187   T09  C~8Aj1      
2019 03  03.528310 12 13 42.25   +02 02 28.6         19GT187   T09  C~8Aj1      
2019 03  03.608930 12 13 41.90   +02 02 30.8         19GT187   T09  C~8Aj1      
2019 04  04.45934  12 11 17.37   +02 16 58.3   25.0g 19GT187   T09  C~8Aj1      
2019 04  04.48250  12 11 17.25   +02 16 59.0   25.2g 19GT187   T09  C~8Aj1      
2019 04  04.50140  12 11 17.17   +02 16 59.3   25.1g 19GT187   T09  C~8Aj1      
2019 04  04.51189  12 11 17.12   +02 16 59.6   25.5g 19GT187   T09  C~8Aj1      
2019 04  05.52240  12 11 12.55   +02 17 25.5   24.5r 19GT187   T09  C~8Aj1      
2019 04  05.57477  12 11 12.31   +02 17 26.5   25.1r 19GT187   T09  C~8Aj1      
2019 04  05.58315  12 11 12.27   +02 17 27.2   24.5r 19GT187   T09  C~8Aj1      

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    -0.00       0.00    -0.02
     2   0.1909  -4791.33     0.00    -140.54     0.01
     3   0.9827   5434.07     0.06    -893.44     0.03
     4   1.0538   3897.66    -0.04    -887.20     0.04
     5   1.0540   3891.97    -0.06    -887.27     0.07
     6   1.1412   1558.86     0.09    -954.94     0.05
     7   1.1412   1556.93    -0.13    -955.02     0.07
     8   1.1413   1555.71     0.04    -955.22    -0.06
     9   1.1413   1554.90     0.00    -955.24    -0.04
    10   1.1441   1481.75     0.00    -958.77     0.01
    11   1.1442   1478.06     0.12    -959.29    -0.30
    12   1.1443   1477.23    -0.10    -958.88     0.13

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.

19GT187    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        45.379    45.534    45.243
ecceobj         0.166     0.177     0.155
incobj         10.430    10.431    10.428
qmin           37.236    36.840    37.778
qmax           54.353    55.070    53.645
amean          45.599    45.758    45.492
amin           45.214    45.340    45.087
amax           46.047    46.263    45.940
emean           0.166     0.175     0.157
emin            0.151     0.160     0.147
emax            0.182     0.192     0.168
imean          10.162    10.193    10.064
imin            9.491     9.482     9.575
imax           10.765    10.989    10.574
excite_mean     0.242     0.249     0.235
fracstop        1.000     1.000     1.000
cjmean          3.049     3.047     3.052

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       182.7     188.0     190.0
kozaiamp        179.9     179.9     180.0