Orbit Fit and Astrometric record for 19VZ50

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: 19VZ50    
# Created Tue Apr  1 01:11:17 2025
# Orbit generated from Bernstein formalism
# Fitting     22 observations of     22
# Arc:   2.43y
# First observation: 2017/06/24
#  Last observation: 2019/11/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.027480   0.000001   0.001990   0.026660   0.000000
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# Chi-squared of fit:    25.05 DOF:     38 RMS:  0.19
# Min/Max residuals:    -0.47    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.609440E-05  2.682527E-02  1.092985E-06  2.010151E-03  2.574609E-02  6.643841E-03
# Covariance matrix:
  4.9967E-13  1.5012E-11 -2.9228E-15  1.2615E-12  1.4083E-11  2.6470E-10
  1.5012E-11  2.2630E-08 -4.4903E-12  1.8673E-09  2.0980E-08  3.9203E-07
 -2.9228E-15 -4.4903E-12  4.8958E-13 -5.7560E-13 -4.1661E-12 -7.7654E-11
  1.2615E-12  1.8673E-09 -5.7560E-13  1.5423E-10  1.7310E-09  3.2358E-08
  1.4083E-11  2.0980E-08 -4.1661E-12  1.7310E-09  1.9451E-08  3.6341E-07
  2.6470E-10  3.9203E-07 -7.7654E-11  3.2358E-08  3.6341E-07  6.7931E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.068431   -9.028862    0.988979    0.011452   -0.212297  2457929.002491
# Heliocentric elements and errors
Epoch:              2457920.5000  =  2017/06/16
Mean Anomaly:           43.99661 +/-     3.179
Argument of Peri:      325.36041 +/-     7.868
Long of Asc Node:      314.48023 +/-     0.045
Inclination:             5.30507 +/-     0.005
Eccentricity:         0.25822330 +/-    0.0964
Semi-Major Axis:     45.58904799 +/-    2.1825
Time of Perihelion: 2444179.8922 +/-     108.8
Perihelion:          33.81689363 +/-    4.6846
Aphelion:            57.36120235 +/-    5.1832
Period (y)              307.8215 +/-     22.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           38.35668209 +/-    0.2075
Ecliptic Y           -7.10117402 +/-    0.0330
Ecliptic Z            2.07921048 +/-    0.0113
Ecliptic XDOT         0.00113749 +/-    0.0003
Ecliptic YDOT         0.00270229 +/-    0.0000
Ecliptic ZDOT         0.00025117 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.06385606 +/-    0.2038
Geocenter to KBO     38.84084442 +/-    0.2104
# Hcoef:  8.57

The following table shows the complete astrometric record for 19VZ50. 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 (19VZ50) followed by the observatory code and reference code for the source of the astrometry.

2017 06  24.50169  23 21 59.51   -00 45 27.5   24.3i 19VZ50    T09  C~7xXH      
2017 06  24.58263  23 21 59.47   -00 45 27.2   24.1i 19VZ50    T09  C~7xXH      
2017 06  24.60432  23 21 59.46   -00 45 27.2   23.8i 19VZ50    T09  C~7xXH      
2019 10  27.21084  23 25 42.23   -00 01 26.0   24.9r 19VZ50    T09  C~7xXH      
2019 10  27.22075  23 25 42.20   -00 01 26.2   24.6r 19VZ50    T09  C~7xXH      
2019 10  27.23054  23 25 42.17   -00 01 26.4   24.6r 19VZ50    T09  C~7xXH      
2019 10  27.24037  23 25 42.13   -00 01 26.7   24.4r 19VZ50    T09  C~7xXH      
2019 10  27.24524  23 25 42.11   -00 01 26.7   24.7r 19VZ50    T09  C~7xXH      
2019 11  01.21232  23 25 27.13   -00 03 18.1   25.0g 19VZ50    T09  C~7xXH      
2019 11  01.29000  23 25 26.92   -00 03 19.8   25.2g 19VZ50    T09  C~7xXH      
2019 11  01.29495  23 25 26.89   -00 03 20.1   24.6g 19VZ50    T09  C~7xXH      
2019 11  01.37860  23 25 26.64   -00 03 21.8   24.9g 19VZ50    T09  C~7xXH      
2019 11  01.45822  23 25 26.42   -00 03 23.5   25.1g 19VZ50    T09  C~7xXH      
2019 11  02.20667  23 25 24.34   -00 03 38.6   24.1i 19VZ50    T09  C~7xXH      
2019 11  02.22066  23 25 24.32   -00 03 38.7   24.6i 19VZ50    T09  C~7xXH      
2019 11  02.23475  23 25 24.28   -00 03 39.2   23.5i 19VZ50    T09  C~7xXH      
2019 11  29.20828  23 24 40.21   -00 10 07.6   24.6r 19VZ50    T09  C~7xXH      
2019 11  29.21333  23 24 40.20   -00 10 07.8   24.9r 19VZ50    T09  C~7xXH      
2019 11  29.21828  23 24 40.20   -00 10 07.8   24.9r 19VZ50    T09  C~7xXH      
2019 11  29.22334  23 24 40.20   -00 10 07.8   25.2r 19VZ50    T09  C~7xXH      
2019 11  29.24183  23 24 40.19   -00 10 07.9   24.6r 19VZ50    T09  C~7xXH      
2019 11  29.24675  23 24 40.19   -00 10 07.9   24.6r 19VZ50    T09  C~7xXH      

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     0.03
     2   0.0002     -0.43    -0.01       0.51     0.04
     3   0.0003     -0.57    -0.05       0.57    -0.04
     4   2.3401   4110.53     0.10    1116.45     0.07
     5   2.3401   4110.04     0.15    1116.44     0.09
     6   2.3401   4109.55     0.19    1116.44     0.10
     7   2.3401   4108.88     0.05    1116.40     0.08
     8   2.3402   4108.60     0.04    1116.51     0.21
     9   2.3538   3858.11    -0.10    1102.36    -0.25
    10   2.3540   3854.54     0.12    1102.04    -0.39
    11   2.3540   3854.01    -0.17    1101.94    -0.47
    12   2.3542   3849.89    -0.23    1101.85    -0.36
    13   2.3544   3846.19    -0.10    1101.58    -0.42
    14   2.3565   3811.55     0.02    1099.96     0.27
    15   2.3565   3811.23     0.37    1099.98     0.33
    16   2.3566   3810.49     0.29    1099.76     0.15
    17   2.4304   3049.76     0.12    1002.33     0.17
    18   2.4304   3049.55    -0.05    1002.21     0.06
    19   2.4304   3049.55    -0.00    1002.21     0.08
    20   2.4304   3049.55     0.05    1002.21     0.10
    21   2.4305   3049.37     0.05    1002.18     0.13
    22   2.4305   3049.37     0.10    1002.18     0.15

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.

19VZ50    quality flag:1

Type:       SCATNEAR  CENTAURR  SCATNEAR

axisobj        45.857    57.739    42.432
ecceobj         0.259     0.501     0.049
incobj          5.305     5.288     5.322
qmin           33.219    28.500    37.360
qmax           60.358    86.673    47.616
amean          45.687    57.152    42.328
amin           44.892    56.631    41.928
amax           47.182    57.739    42.786
emean           0.248     0.496     0.069
emin            0.203     0.489     0.032
emax            0.282     0.502     0.116
imean           5.577     6.820     6.551
imin            3.303     6.717     4.858
imax            7.487     6.893     8.166
excite_mean     0.267     0.510     0.135
fracstop        1.000     0.001     1.000
cjmean          3.033     2.900     3.060

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       178.9     325.1     158.9
kozaiamp        180.0       1.8     179.8