Orbit Fit and Astrometric record for 19EN7

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: 19EN7     
# Created Tue Apr  1 01:11:12 2025
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:   2.19y
# First observation: 2016/12/29
#  Last observation: 2019/03/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000015   0.023214   0.000003  -0.001027   0.024040   0.000000
# Chi-squared of fit:     4.83 DOF:     26 RMS:  0.10
# Min/Max residuals:    -0.19    0.30
# Exact a, adot, b, bdot, g, gdot:
  1.523058E-05  2.276354E-02 -6.472077E-07 -1.006714E-03  2.360725E-02 -3.794080E-04
# Covariance matrix:
  1.4580E-12 -2.7692E-12 -4.5269E-14  1.1086E-13 -1.6701E-12 -4.7808E-11
 -2.7692E-12  3.1238E-11  5.2713E-13 -1.5243E-12  2.8786E-11  6.3118E-10
 -4.5269E-14  5.2713E-13  7.2045E-13 -4.3035E-13  4.8519E-13  1.0738E-11
  1.1086E-13 -1.5243E-12 -4.3035E-13  3.3781E-13 -1.4216E-12 -3.1063E-11
 -1.6701E-12  2.8786E-11  4.8519E-13 -1.4216E-12  2.7243E-11  5.8691E-10
 -4.7808E-11  6.3118E-10  1.0738E-11 -3.1063E-11  5.8691E-10  1.2862E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.253654  173.951557    0.958988    0.009374   -0.232579  2457751.846162
# Heliocentric elements and errors
Epoch:              2457750.5000  =  2016/12/28
Mean Anomaly:          287.14219 +/-     1.073
Argument of Peri:      215.30927 +/-     1.581
Long of Asc Node:       34.78240 +/-     0.015
Inclination:             3.33885 +/-     0.001
Eccentricity:         0.04158739 +/-    0.0049
Semi-Major Axis:     43.06490167 +/-    0.0252
Time of Perihelion: 2478641.4033 +/-     307.0
Perihelion:          41.27394468 +/-    0.2116
Aphelion:            44.85585865 +/-    0.2119
Period (y)              282.6138 +/-      0.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.22535609 +/-    0.0093
Ecliptic Y            5.43359227 +/-    0.0010
Ecliptic Z            1.66564745 +/-    0.0004
Ecliptic XDOT        -0.00023643 +/-    0.0000
Ecliptic YDOT        -0.00263617 +/-    0.0000
Ecliptic ZDOT        -0.00011845 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.60609116 +/-    0.0092
Geocenter to KBO     42.35986304 +/-    0.0094
# Hcoef:  7.45

The following table shows the complete astrometric record for 19EN7. 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 (19EN7) followed by the observatory code and reference code for the source of the astrometry.

2016 12  29.345373 11 41 22.123  +04 28 16.68  24.1z 19EN7     W84  C~8HR7      
2018 03  18.47675  11 42 07.21   +04 21 25.7   23.6i 19EN7     T09  C~83G9      
2018 03  18.57604  11 42 06.75   +04 21 28.5   23.6i 19EN7     T09  C~83G9      
2018 03  18.60275  11 42 06.64   +04 21 29.0   23.2i 19EN7     T09  C~83G9      
2018 04  12.106153 11 40 22.301  +04 32 05.82  23.8V 19EN7     W84  C~8HR7      
2018 04  13.103871 11 40 18.442  +04 32 28.46  24.1V 19EN7     W84  C~8HR7      
2018 04  24.36908  11 39 38.21   +04 36 18.7   23.4z 19EN7     T09  C~83G9      
2018 04  24.41221  11 39 38.07   +04 36 19.5   23.5z 19EN7     T09  C~83G9      
2018 04  24.45594  11 39 37.92   +04 36 20.3   24.0z 19EN7     T09  C~83G9      
2018 04  24.49606  11 39 37.80   +04 36 21.3   23.2z 19EN7     T09  C~83G9      
2019 03  02.43089  11 48 07.63   +03 38 41.3   23.0y 19EN7     T09  C~83G9      
2019 03  02.44784  11 48 07.55   +03 38 41.8   23.3y 19EN7     T09  C~83G9      
2019 03  02.53236  11 48 07.18   +03 38 44.3   23.2y 19EN7     T09  C~83G9      
2019 03  08.34835  11 47 41.89   +03 41 28.7   23.7r 19EN7     T09  C~83G9      
2019 03  08.37068  11 47 41.80   +03 41 29.4   23.7r 19EN7     T09  C~83G9      
2019 03  08.40431  11 47 41.66   +03 41 30.4   23.5r 19EN7     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     0.00       0.00    -0.01
     2   1.2160    782.03     0.03    -109.61     0.02
     3   1.2162    774.61    -0.10    -109.77    -0.02
     4   1.2163    772.90     0.15    -109.96    -0.19
     5   1.2834   -912.08    -0.16    -144.45    -0.00
     6   1.2861   -974.03    -0.14    -146.54     0.00
     7   1.3170  -1617.60     0.03    -173.57    -0.04
     8   1.3171  -1619.84     0.08    -173.67    -0.01
     9   1.3172  -1622.22     0.02    -173.82    -0.03
    10   1.3173  -1624.26     0.09    -173.61     0.30
    11   2.1713   6752.59     0.07    -316.66    -0.00
    12   2.1714   6751.29    -0.02    -316.68    -0.02
    13   2.1716   6745.21    -0.08    -316.59     0.10
    14   2.1876   6332.06    -0.11    -316.72    -0.15
    15   2.1876   6330.55     0.00    -316.61    -0.03
    16   2.1877   6328.22     0.13    -316.53     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.

19EN7    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.701    42.740    42.672
ecceobj         0.037     0.049     0.028
incobj          3.348     3.349     3.348
qmin           40.653    40.170    41.007
qmax           45.250    45.781    44.815
amean          42.852    42.895    42.820
amin           42.521    42.559    42.495
amax           43.184    43.238    43.147
emean           0.029     0.040     0.021
emin            0.009     0.020     0.001
emax            0.048     0.059     0.039
imean           2.411     2.413     2.408
imin            1.386     1.362     1.380
imax            3.331     3.341     3.323
excite_mean     0.051     0.059     0.047
fracstop        1.000     1.000     1.000
cjmean          3.085     3.084     3.085

libcent 0      -180.0     174.0    -180.0
libamp  0      -180.0     163.0    -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       195.1     198.2     190.4
kozaiamp        179.9     180.0     180.0