Orbit Fit and Astrometric record for 19GW184

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: 19GW184   
# Created Tue Apr  1 01:11:13 2025
# Orbit generated from Bernstein formalism
# Fitting     19 observations of     19
# Arc:   1.14y
# First observation: 2018/02/11
#  Last observation: 2019/04/05
Preliminary a, adot, b, bdot, g, gdot:
   0.000001   0.032181  -0.000006   0.002325   0.026329   0.000000
# Chi-squared of fit:     7.55 DOF:     32 RMS:  0.11
# Min/Max residuals:    -0.30    0.25
# Exact a, adot, b, bdot, g, gdot:
  1.936678E-05  3.187968E-02  1.259012E-06  2.286461E-03  2.620932E-02 -8.933284E-03
# Covariance matrix:
  1.2289E-12  1.3193E-12 -3.4507E-14  2.3588E-13  1.6791E-12  7.9157E-11
  1.3193E-12  5.1467E-12 -9.1929E-14  6.4676E-13  3.6741E-12  2.1549E-10
 -3.4507E-14 -9.1929E-14  3.7816E-13 -3.7158E-13 -7.4220E-14 -4.2164E-12
  2.3588E-13  6.4676E-13 -3.7158E-13  5.1731E-13  5.1214E-13  2.9596E-11
  1.6791E-12  3.6741E-12 -7.4220E-14  5.1214E-13  3.4032E-12  1.7146E-10
  7.9157E-11  2.1549E-10 -4.2164E-12  2.9596E-11  1.7146E-10  9.8667E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.447309  179.395173    0.597330    0.047565   -0.787697  2458161.155206
# Heliocentric elements and errors
Epoch:              2458160.5000  =  2018/02/11
Mean Anomaly:          351.77557 +/-     0.089
Argument of Peri:       82.61303 +/-     0.307
Long of Asc Node:      139.45409 +/-     0.008
Inclination:             5.34858 +/-     0.001
Eccentricity:         0.63111468 +/-    0.0031
Semi-Major Axis:     94.40350673 +/-    0.6194
Time of Perihelion: 2465814.4162 +/-      35.4
Perihelion:          34.82406788 +/-    0.3721
Aphelion:           153.98294558 +/-    1.0521
Period (y)              917.2556 +/-      9.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.86754892 +/-    0.0027
Ecliptic Y            1.00058505 +/-    0.0001
Ecliptic Z            2.29429283 +/-    0.0002
Ecliptic XDOT         0.00091679 +/-    0.0000
Ecliptic YDOT        -0.00334470 +/-    0.0000
Ecliptic ZDOT         0.00018215 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.94805912 +/-    0.0027
Geocenter to KBO     38.15437084 +/-    0.0027
# Hcoef:  8.75

The following table shows the complete astrometric record for 19GW184. 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 (19GW184) followed by the observatory code and reference code for the source of the astrometry.

2018 02  11.654405 12 03 16.32   +03 24 11.1         19GW184   T09  C~870j      
2018 03  18.486862 12 00 51.58   +03 41 53.8         19GW184   T09  C~870j      
2018 04  24.409486 11 58 12.90   +03 58 55.0         19GW184   T09  C~870j      
2018 04  24.453253 11 58 12.73   +03 58 56.1         19GW184   T09  C~870j      
2018 04  24.504079 11 58 12.55   +03 58 56.9         19GW184   T09  C~870j      
2019 02  05.53446  12 10 34.89   +02 44 34.1   24.5i 19GW184   T09  C~83GG      
2019 02  05.58442  12 10 34.74   +02 44 35.3   24.6i 19GW184   T09  C~83GG      
2019 02  05.62497  12 10 34.62   +02 44 36.4   24.1i 19GW184   T09  C~83GG      
2019 03  03.51760  12 09 00.74   +02 56 52.7   24.3z 19GW184   T09  C~83GG      
2019 03  03.52564  12 09 00.69   +02 56 52.6   24.1z 19GW184   T09  C~83GG      
2019 03  03.61973  12 09 00.29   +02 56 55.6   24.0z 19GW184   T09  C~83GG      
2019 03  03.62241  12 09 00.27   +02 56 55.9   23.7z 19GW184   T09  C~83GG      
2019 04  04.45724  12 06 35.30   +03 13 35.1   25.5g 19GW184   T09  C~83GG      
2019 04  04.46994  12 06 35.25   +03 13 35.5   25.7g 19GW184   T09  C~83GG      
2019 04  04.49094  12 06 35.16   +03 13 36.0   24.9g 19GW184   T09  C~83GG      
2019 04  05.52031  12 06 30.50   +03 14 05.9   24.3r 19GW184   T09  C~83GG      
2019 04  05.53288  12 06 30.47   +03 14 06.4   24.7r 19GW184   T09  C~83GG      
2019 04  05.55382  12 06 30.36   +03 14 07.2   24.6r 19GW184   T09  C~83GG      
2019 04  05.57477  12 06 30.28   +03 14 07.9   24.8r 19GW184   T09  C~83GG      

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    -0.03       0.00     0.02
     2   0.0954  -2410.99     0.07     112.04     0.07
     3   0.1965  -4996.96     0.05     105.08    -0.02
     4   0.1966  -4999.73    -0.14     105.07     0.08
     5   0.1967  -5002.52     0.05     104.74    -0.15
     6   0.9826   6974.46     0.08     443.68    -0.06
     7   0.9827   6971.92     0.00     443.88    -0.10
     8   0.9828   6969.83    -0.08     444.17    -0.01
     9   1.0537   5384.85     0.03     556.62     0.25
    10   1.0537   5384.20    -0.03     556.23    -0.16
    11   1.0540   5377.50     0.09     556.58    -0.05
    12   1.0540   5377.11    -0.11     556.74     0.09
    13   1.1411   2986.33    -0.12     605.26    -0.03
    14   1.1412   2985.48    -0.01     605.33     0.05
    15   1.1412   2984.05     0.12     605.25    -0.02
    16   1.1441   2908.11    -0.14     604.80    -0.30
    17   1.1441   2907.49     0.18     605.08    -0.01
    18   1.1441   2905.66    -0.10     605.15     0.08
    19   1.1442   2904.29     0.07     605.32     0.25

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.

19GW184    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        91.707    92.997    90.496
ecceobj         0.620     0.627     0.613
incobj          5.357     5.356     5.358
qmin           33.982    33.817    34.031
qmax          155.448   166.298   166.042
amean          90.168    94.076    94.074
amin           87.564    88.029    89.511
amax           95.158   100.559   100.522
emean           0.612     0.629     0.627
emin            0.599     0.600     0.605
emax            0.634     0.654     0.652
imean           4.296     4.640     4.071
imin            3.731     3.976     3.575
imax            4.872     5.400     4.604
excite_mean     0.617     0.635     0.631
fracstop        1.000     1.000     1.000
cjmean          3.063     3.057     3.065

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       193.6     190.2     163.7
kozaiamp        180.0     180.0     180.0