Orbit Fit and Astrometric record for 19CR31

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: 19CR31    
# Created Tue Apr  1 01:11:11 2025
# Orbit generated from Bernstein formalism
# Fitting      9 observations of      9
# Arc:  57.93d
# First observation: 2019/02/05
#  Last observation: 2019/04/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000001   0.028071  -0.000001   0.000780   0.025825   0.000000
# Chi-squared of fit:     3.81 DOF:     12 RMS:  0.11
# Min/Max residuals:    -0.17    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.546017E-05  2.594827E-02  6.053940E-08  8.271761E-04  2.527142E-02 -4.407160E-03
# Covariance matrix:
  4.3784E-13  1.2126E-10 -6.1674E-14 -3.1745E-12  2.6596E-11  1.5726E-09
  1.2126E-10  2.1079E-07 -1.0025E-10 -5.5389E-09  4.3701E-08  2.1751E-06
 -6.1674E-14 -1.0025E-10  3.6886E-13  3.1055E-13 -2.0849E-11 -1.0540E-09
 -3.1745E-12 -5.5389E-09  3.1055E-13  1.7947E-10 -1.1469E-09 -5.6673E-08
  2.6596E-11  4.3701E-08 -2.0849E-11 -1.1469E-09  9.0828E-09  4.5752E-07
  1.5726E-09  2.1751E-06 -1.0540E-09 -5.6673E-08  4.5752E-07  2.4438E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.677600 -176.242153    0.735259    0.054361   -0.663607  2458520.062551
# Heliocentric elements and errors
Epoch:              2458520.5000  =  2019/02/06
Mean Anomaly:          311.09057 +/-     8.625
Argument of Peri:      138.52304 +/-    24.967
Long of Asc Node:      115.29240 +/-     0.560
Inclination:             4.97933 +/-     0.020
Eccentricity:         0.21635072 +/-    0.1806
Semi-Major Axis:     45.18671693 +/-    2.5411
Time of Perihelion: 2473593.6733 +/-    2334.2
Perihelion:          35.41053803 +/-    8.3995
Aphelion:            54.96289583 +/-    8.7258
Period (y)              303.7557 +/-     25.62
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.06530643 +/-    0.1484
Ecliptic Y           -1.90286161 +/-    0.0097
Ecliptic Z            3.22690866 +/-    0.0122
Ecliptic XDOT         0.00067443 +/-    0.0005
Ecliptic YDOT        -0.00277512 +/-    0.0001
Ecliptic ZDOT         0.00005017 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.24006215 +/-    0.1478
Geocenter to KBO     39.57038946 +/-    0.1492
# Hcoef:  7.67

The following table shows the complete astrometric record for 19CR31. 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 (19CR31) followed by the observatory code and reference code for the source of the astrometry.

2019 02  05.56175  12 21 13.51   +02 47 57.2   23.2i 19CR31    T09  C~8HR5      
2019 02  05.58976  12 21 13.42   +02 47 57.9   23.3i 19CR31    T09  C~8HR5      
2019 02  05.60340  12 21 13.38   +02 47 58.0   23.4i 19CR31    T09  C~8HR5      
2019 02  05.63031  12 21 13.30   +02 47 58.9   23.2i 19CR31    T09  C~8HR5      
2019 03  03.58751  12 19 42.19   +03 00 03.0   23.3z 19CR31    T09  C~8HR5      
2019 03  03.64387  12 19 41.93   +03 00 04.8   22.9z 19CR31    T09  C~8HR5      
2019 04  04.45230  12 17 17.88   +03 16 22.1   24.7g 19CR31    T09  C~8HR5      
2019 04  04.46143  12 17 17.82   +03 16 22.3   24.8g 19CR31    T09  C~8HR5      
2019 04  04.49512  12 17 17.67   +03 16 23.6   24.5g 19CR31    T09  C~8HR5      

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     0.16       0.00     0.09
     2   0.0001     -1.52    -0.03       0.11     0.05
     3   0.0001     -2.11     0.03      -0.04    -0.17
     4   0.0002     -3.56    -0.16       0.31     0.03
     5   0.0713  -1543.82     0.15     122.63     0.03
     6   0.0714  -1548.11    -0.15     122.74    -0.03
     7   0.1585  -3916.74     0.16     163.65    -0.01
     8   0.1585  -3917.64    -0.06     163.47    -0.17
     9   0.1586  -3920.22    -0.10     163.78     0.18

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.

19CR31    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0