Orbit Fit and Astrometric record for 19GZ184

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: 19GZ184   
# Created Tue Apr  1 01:11:13 2025
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   4.19y
# First observation: 2015/01/25
#  Last observation: 2019/04/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000271   0.028698   0.000036   0.009979   0.026822   0.000000
# Chi-squared of fit:    22.53 DOF:     50 RMS:  0.16
# Min/Max residuals:    -0.41    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.647550E-05  2.888520E-02  6.770096E-06  1.008413E-02  2.706022E-02  5.370744E-03
# Covariance matrix:
  5.2097E-13  1.2242E-13 -2.3223E-14  7.7254E-14  4.0952E-13  1.8212E-12
  1.2242E-13  4.0374E-13 -4.7217E-14  1.6590E-13  3.4713E-13  3.8667E-12
 -2.3223E-14 -4.7217E-14  2.1057E-13 -7.2855E-14 -4.4424E-14 -4.7401E-13
  7.7254E-14  1.6590E-13 -7.2855E-14  8.9570E-14  1.5147E-13  1.6643E-12
  4.0952E-13  3.4713E-13 -4.4424E-14  1.5147E-13  5.8071E-13  3.5523E-12
  1.8212E-12  3.8667E-12 -4.7401E-13  1.6643E-12  3.5523E-12  3.8795E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.401482  176.233855    0.766518    0.015175   -0.614028  2457048.074250
# Heliocentric elements and errors
Epoch:              2457040.5000  =  2015/01/18
Mean Anomaly:           21.37981 +/-     0.017
Argument of Peri:      324.17228 +/-     0.038
Long of Asc Node:      171.10815 +/-     0.000
Inclination:            19.22612 +/-     0.000
Eccentricity:         0.29896656 +/-    0.0002
Semi-Major Axis:     50.71689217 +/-    0.0067
Time of Perihelion: 2449205.6869 +/-       6.0
Perihelion:          35.55423727 +/-    0.0092
Aphelion:            65.87954706 +/-    0.0118
Period (y)              361.1912 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.42929211 +/-    0.0010
Ecliptic Y            3.23193561 +/-    0.0001
Ecliptic Z            0.90407467 +/-    0.0000
Ecliptic XDOT        -0.00071294 +/-    0.0000
Ecliptic YDOT        -0.00288755 +/-    0.0000
Ecliptic ZDOT         0.00103336 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.57944474 +/-    0.0010
Geocenter to KBO     36.95461761 +/-    0.0010
# Hcoef:  7.39

The following table shows the complete astrometric record for 19GZ184. 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 (19GZ184) followed by the observatory code and reference code for the source of the astrometry.

2015 01  25.573472 11 48 24.22   +02 47 00.1         19GZ184   T09  C~870j      
2015 01  25.636988 11 48 24.06   +02 47 01.7         19GZ184   T09  C~870j      
2015 04  14.052108 11 42 53.75   +03 31 31.0   22.3Y 19GZ184   W91  C~870j      
2015 04  14.067486 11 42 53.67   +03 31 31.3   22.7z 19GZ184   W91  C~870j      
2015 04  14.070821 11 42 53.66   +03 31 31.3   22.9z 19GZ184   W91  C~870j      
2015 04  14.074148 11 42 53.65   +03 31 31.5         19GZ184   W91  C~870j      
2015 04  17.096740 11 42 41.53   +03 33 04.7   23.2r 19GZ184   W84  C~870j      
2016 04  08.123763 11 50 19.20   +03 20 48.0   22.9r 19GZ184   W84  C~870j      
2018 04  12.140218 12 03 58.46   +03 06 35.5   23.3V 19GZ184   W84  C~870j      
2018 04  13.136816 12 03 54.15   +03 07 07.3   23.2V 19GZ184   W84  C~870j      
2018 04  22.367255 12 03 16.23   +03 11 44.6         19GZ184   T09  C~870j      
2018 05  16.974302 12 02 00.01   +03 20 49.4   23.2r 19GZ184   W84  C~870j      
2019 02  05.527701 12 15 26.12   +02 20 17.5         19GZ184   T09  C~870j      
2019 02  05.627630 12 15 25.86   +02 20 20.1         19GZ184   T09  C~870j      
2019 02  06.306743 12 15 23.96   +02 20 39.9   23.6g 19GZ184   W84  C~870j      
2019 03  03.52832  12 13 51.92   +02 34 39.5   23.0z 19GZ184   T09  C~83GG      
2019 03  03.56874  12 13 51.73   +02 34 41.1   22.9z 19GZ184   T09  C~83GG      
2019 03  03.62241  12 13 51.48   +02 34 43.1   22.8z 19GZ184   T09  C~83GG      
2019 03  03.62510  12 13 51.48   +02 34 42.9   22.9z 19GZ184   T09  C~83GG      
2019 04  04.44950  12 11 24.61   +02 54 02.3   23.8g 19GZ184   T09  C~83GG      
2019 04  04.45934  12 11 24.57   +02 54 02.8   23.8g 19GZ184   T09  C~83GG      
2019 04  04.49303  12 11 24.40   +02 54 03.8   23.7g 19GZ184   T09  C~83GG      
2019 04  04.51189  12 11 24.30   +02 54 04.5   23.8g 19GZ184   T09  C~83GG      
2019 04  04.51398  12 11 24.30   +02 54 04.5   23.7g 19GZ184   T09  C~83GG      
2019 04  05.52240  12 11 19.67   +02 54 39.6   23.2r 19GZ184   T09  C~83GG      
2019 04  05.55592  12 11 19.53   +02 54 40.8   23.1r 19GZ184   T09  C~83GG      
2019 04  05.57477  12 11 19.43   +02 54 41.5   23.4r 19GZ184   T09  C~83GG      
2019 04  05.57686  12 11 19.43   +02 54 41.5   23.2r 19GZ184   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     0.08       0.00    -0.18
     2   0.0002     -2.84     0.15       0.52    -0.11
     3   0.2149  -5604.38     0.05     487.77     0.27
     4   0.2149  -5605.60    -0.10     487.57     0.01
     5   0.2149  -5605.74    -0.01     487.51    -0.07
     6   0.2149  -5605.95     0.01     487.63     0.05
     7   0.2232  -5809.64    -0.10     501.34     0.13
     8   1.2007    774.03    -0.04    2545.60    -0.12
     9   3.2103  12383.22     0.00    6671.58     0.10
    10   3.2130  12311.04     0.08    6674.79     0.05
    11   3.2383  11677.14    -0.05    6700.88    -0.06
    12   3.3057  10408.80    -0.24    6742.08    -0.09
    13   4.0300  23024.36    -0.41    8288.31     0.08
    14   4.0303  23019.69     0.06    8289.12    -0.02
    15   4.0321  22985.22     0.03    8295.77    -0.08
    16   4.1012  21365.33     0.15    8507.79     0.14
    17   4.1013  21362.04    -0.08    8508.11     0.19
    18   4.1014  21357.76    -0.30    8508.42     0.15
    19   4.1014  21357.84    -0.01    8508.24    -0.05
    20   4.1886  18851.47     0.18    8681.16    -0.26
    21   4.1886  18850.71     0.20    8681.37    -0.07
    22   4.1887  18847.95     0.10    8681.26    -0.30
    23   4.1887  18846.29    -0.08    8681.30    -0.32
    24   4.1887  18846.29     0.08    8681.30    -0.33
    25   4.1915  18767.96    -0.02    8685.43     0.13
    26   4.1916  18765.54     0.17    8685.68     0.27
    27   4.1917  18763.87    -0.03    8685.72     0.25
    28   4.1917  18763.87     0.14    8685.72     0.24

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.

19GZ184    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        50.237    50.258    50.216
ecceobj         0.293     0.294     0.293
incobj         19.295    19.295    19.295
qmin           35.053    34.870    34.110
qmax           66.571    66.751    67.637
amean          50.415    50.415    50.429
amin           49.870    49.904    49.857
amax           51.076    51.073    51.146
emean           0.294     0.295     0.298
emin            0.284     0.282     0.280
emax            0.305     0.308     0.324
imean          18.747    18.676    18.573
imin           18.411    18.365    17.430
imax           19.031    19.102    19.257
excite_mean     0.435     0.435     0.436
fracstop        1.000     1.000     1.000
cjmean          2.940     2.940     2.939

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       170.6     161.1     171.6
kozaiamp        180.0     180.0     180.0