Orbit Fit and Astrometric record for 19EL7

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: 19EL7     
# Created Tue Apr  1 01:11:12 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   0.97y
# First observation: 2018/03/18
#  Last observation: 2019/03/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000051   0.023081  -0.000001  -0.000839   0.023758   0.000000
# Chi-squared of fit:     6.42 DOF:     30 RMS:  0.11
# Min/Max residuals:    -0.32    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.543127E-05  2.303718E-02 -1.441345E-06 -8.421881E-04  2.400331E-02  2.239541E-04
# Covariance matrix:
  4.9306E-13  1.3297E-12  7.3362E-15 -6.9881E-14  1.2272E-12  7.7295E-11
  1.3297E-12  2.5739E-11  7.6216E-14 -9.1800E-13  1.1028E-11  1.0101E-09
  7.3362E-15  7.6216E-14  2.3904E-13 -2.7199E-13  4.1950E-14  3.2658E-12
 -6.9881E-14 -9.1800E-13 -2.7199E-13  4.9640E-13 -4.4137E-13 -3.7719E-11
  1.2272E-12  1.1028E-11  4.1950E-14 -4.4137E-13  6.6428E-12  4.8704E-10
  7.7295E-11  1.0101E-09  3.2658E-12 -3.7719E-11  4.8704E-10  4.1538E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.888355  175.272230   -0.033028    0.032837   -0.993259  2458195.963881
# Heliocentric elements and errors
Epoch:              2458190.5000  =  2018/03/13
Mean Anomaly:           92.03099 +/-     4.325
Argument of Peri:       45.58314 +/-     4.289
Long of Asc Node:       36.72857 +/-     0.023
Inclination:             2.78745 +/-     0.001
Eccentricity:         0.00812982 +/-    0.0088
Semi-Major Axis:     42.63979881 +/-    0.0123
Time of Perihelion: 2432191.7338 +/-    1221.7
Perihelion:          42.29314477 +/-    0.3757
Aphelion:            42.98645285 +/-    0.3757
Period (y)              278.4395 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.49116117 +/-    0.0045
Ecliptic Y            3.47375557 +/-    0.0004
Ecliptic Z            1.37277226 +/-    0.0001
Ecliptic XDOT        -0.00023881 +/-    0.0000
Ecliptic YDOT        -0.00262083 +/-    0.0000
Ecliptic ZDOT        -0.00009532 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.65501446 +/-    0.0044
Geocenter to KBO     41.66092620 +/-    0.0045
# Hcoef:  8.25

The following table shows the complete astrometric record for 19EL7. 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 (19EL7) followed by the observatory code and reference code for the source of the astrometry.

2018 03  18.46308  11 45 38.68   +03 36 43.4   24.1i 19EL7     T09  C~83G9      
2018 03  18.50571  11 45 38.48   +03 36 44.4   24.0i 19EL7     T09  C~83G9      
2018 03  18.57871  11 45 38.16   +03 36 46.4   24.0i 19EL7     T09  C~83G9      
2018 04  24.37247  11 43 09.01   +03 51 56.1   23.4z 19EL7     T09  C~83G9      
2018 04  24.40148  11 43 08.91   +03 51 56.3   23.5z 19EL7     T09  C~83G9      
2018 04  24.44523  11 43 08.77   +03 51 57.3   23.8z 19EL7     T09  C~83G9      
2018 04  24.49606  11 43 08.60   +03 51 57.8   24.1z 19EL7     T09  C~83G9      
2019 02  04.58875  11 53 12.93   +02 44 02.3   25.7g 19EL7     T09  C~83G9      
2019 02  04.63313  11 53 12.78   +02 44 03.3   26.1g 19EL7     T09  C~83G9      
2019 02  04.66250  11 53 12.69   +02 44 03.8   25.4g 19EL7     T09  C~83G9      
2019 02  05.45789  11 53 10.27   +02 44 20.9   24.5i 19EL7     T09  C~83G9      
2019 02  05.47392  11 53 10.22   +02 44 21.2   24.1i 19EL7     T09  C~83G9      
2019 02  05.51157  11 53 10.09   +02 44 22.1   24.6i 19EL7     T09  C~83G9      
2019 02  05.51425  11 53 10.09   +02 44 22.1   24.6i 19EL7     T09  C~83G9      
2019 03  08.35114  11 51 11.30   +02 57 37.4   24.5r 19EL7     T09  C~83G9      
2019 03  08.36022  11 51 11.26   +02 57 37.5   24.5r 19EL7     T09  C~83G9      
2019 03  08.40431  11 51 11.08   +02 57 38.9   24.9r 19EL7     T09  C~83G9      
2019 03  08.43604  11 51 10.93   +02 57 39.7   24.4r 19EL7     T09  C~83G9      

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     0.18
     2   0.0001     -3.14    -0.06      -0.27    -0.04
     3   0.0003     -8.34     0.11      -0.34    -0.04
     4   0.1011  -2418.62    -0.15     -51.41     0.23
     5   0.1011  -2420.07    -0.04     -51.82    -0.10
     6   0.1013  -2422.39     0.00     -51.73     0.10
     7   0.1014  -2424.93     0.19     -52.28    -0.32
     8   0.8847   7502.63     0.10    -191.60     0.04
     9   0.8848   7500.17    -0.09    -191.58     0.02
    10   0.8849   7498.73    -0.02    -191.66    -0.08
    11   0.8870   7458.61     0.04    -190.44     0.01
    12   0.8871   7457.80     0.06    -190.47    -0.03
    13   0.8872   7455.66    -0.11    -190.42    -0.01
    14   0.8872   7455.66     0.03    -190.42    -0.01
    15   0.9716   5504.55    -0.11    -170.54     0.05
    16   0.9717   5503.96    -0.04    -170.69    -0.10
    17   0.9718   5500.93     0.12    -170.48     0.13
    18   0.9719   5498.55     0.04    -170.64    -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.

19EL7    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.378    42.486    42.308
ecceobj         0.015     0.035     0.013
incobj          2.794     2.793     2.794
qmin           40.362    39.323    41.031
qmax           44.871    46.122    44.044
amean          42.515    42.619    42.451
amin           42.195    42.284    42.127
amax           42.859    42.978    42.776
emean           0.026     0.050     0.015
emin            0.004     0.026     0.000
emax            0.047     0.074     0.030
imean           1.941     2.015     1.955
imin            0.476     0.426     0.470
imax            2.836     2.950     2.849
excite_mean     0.045     0.063     0.038
fracstop        1.000     1.000     1.000
cjmean          3.082     3.080     3.081

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       176.5     178.3     184.9
kozaiamp        179.9     180.0     180.0