Orbit Fit and Astrometric record for 19JA145

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: 19JA145   
# Created Tue Apr  1 01:11:14 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:   2.18y
# First observation: 2017/03/25
#  Last observation: 2019/05/31
Preliminary a, adot, b, bdot, g, gdot:
   0.000010   0.020895  -0.000003  -0.004494   0.025102   0.000000
# Chi-squared of fit:    14.81 DOF:     36 RMS:  0.15
# Min/Max residuals:    -0.35    0.39
# Exact a, adot, b, bdot, g, gdot:
  1.371276E-05  2.067583E-02 -2.393919E-06 -4.477271E-03  2.362115E-02 -3.247981E-03
# Covariance matrix:
  5.0665E-13  3.5666E-12  1.7110E-15 -8.5029E-13  3.4197E-12  9.2446E-11
  3.5666E-12  8.1970E-10  4.3587E-13 -1.8308E-10  7.4930E-10  1.9875E-08
  1.7110E-15  4.3587E-13  4.8772E-13 -3.3059E-13  4.0905E-13  1.0513E-11
 -8.5029E-13 -1.8308E-10 -3.3059E-13  4.1029E-11 -1.6733E-10 -4.4400E-09
  3.4197E-12  7.4930E-10  4.0905E-13 -1.6733E-10  6.8691E-10  1.8161E-08
  9.2446E-11  1.9875E-08  1.0513E-11 -4.4400E-09  1.8161E-08  4.8202E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -4.908825  158.285505   -0.433332   -0.076363   -0.891133  2457837.585901
# Heliocentric elements and errors
Epoch:              2457830.5000  =  2017/03/18
Mean Anomaly:          244.18659 +/-     7.572
Argument of Peri:      333.72016 +/-     6.697
Long of Asc Node:      317.55966 +/-     0.014
Inclination:            13.02950 +/-     0.007
Eccentricity:         0.17317212 +/-    0.0211
Semi-Major Axis:     39.41208662 +/-    0.3849
Time of Perihelion: 2486904.1075 +/-    1852.5
Perihelion:          32.58701193 +/-    0.8895
Aphelion:            46.23716130 +/-    0.9454
Period (y)              247.4300 +/-      3.62
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.18114552 +/-    0.0435
Ecliptic Y           15.52900225 +/-    0.0173
Ecliptic Z           -3.62273837 +/-    0.0040
Ecliptic XDOT        -0.00049345 +/-    0.0001
Ecliptic YDOT        -0.00238820 +/-    0.0000
Ecliptic ZDOT        -0.00048490 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.22960328 +/-    0.0409
Geocenter to KBO     42.33493978 +/-    0.0470
# Hcoef:  8.11

The following table shows the complete astrometric record for 19JA145. 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 (19JA145) followed by the observatory code and reference code for the source of the astrometry.

2017 03  25.08510  10 32 22.17   +03 54 21.9   24.6V 19JA145   W84  C~83GK      
2017 03  25.17804  10 32 21.79   +03 54 24.3         19JA145   W84  C~83GK      
2017 03  26.08868  10 32 18.20   +03 54 46.5         19JA145   W84  C~83GK      
2019 04  07.30645  10 39 40.45   +02 37 32.5   24.8g 19JA145   T09  C~83GK      
2019 04  07.32324  10 39 40.39   +02 37 33.1   25.2g 19JA145   T09  C~83GK      
2019 04  07.33864  10 39 40.33   +02 37 33.1   25.1g 19JA145   T09  C~83GK      
2019 04  07.36014  10 39 40.26   +02 37 34.0   25.2g 19JA145   T09  C~83GK      
2019 04  07.39191  10 39 40.16   +02 37 34.6   25.1g 19JA145   T09  C~83GK      
2019 04  08.24482  10 39 37.26   +02 37 54.5   23.7y 19JA145   T09  C~83GK      
2019 04  08.27248  10 39 37.13   +02 37 54.8   23.6y 19JA145   T09  C~83GK      
2019 04  08.30540  10 39 37.02   +02 37 55.3   24.0y 19JA145   T09  C~83GK      
2019 04  08.33583  10 39 36.93   +02 37 56.2   24.0y 19JA145   T09  C~83GK      
2019 04  08.37648  10 39 36.79   +02 37 56.8   23.9y 19JA145   T09  C~83GK      
2019 05  08.33595  10 38 25.94   +02 47 01.3   24.1i 19JA145   T09  C~83GK      
2019 05  08.36272  10 38 25.89   +02 47 01.6   24.1i 19JA145   T09  C~83GK      
2019 05  08.36539  10 38 25.90   +02 47 01.6   24.1i 19JA145   T09  C~83GK      
2019 05  08.39491  10 38 25.85   +02 47 01.9   24.2i 19JA145   T09  C~83GK      
2019 05  31.27995  10 38 20.16   +02 49 38.7   24.8r 19JA145   T09  C~83GK      
2019 05  31.28833  10 38 20.19   +02 49 38.9   25.0r 19JA145   T09  C~83GK      
2019 05  31.34382  10 38 20.20   +02 49 38.9   25.0r 19JA145   T09  C~83GK      
2019 05  31.34592  10 38 20.21   +02 49 38.9   24.5r 19JA145   T09  C~83GK      

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     0.03       0.00    -0.12
     2   0.0003     -6.17    -0.07       0.12    -0.01
     3   0.0027    -64.30     0.04       0.84     0.15
     4   2.0348   7809.61    -0.03   -1843.75    -0.03
     5   2.0349   7808.55    -0.12   -1843.53     0.16
     6   2.0349   7807.72    -0.06   -1843.86    -0.20
     7   2.0350   7806.41    -0.13   -1843.42     0.21
     8   2.0351   7804.79     0.09   -1843.42     0.15
     9   2.0374   7756.98     0.14   -1841.11     0.39
    10   2.0375   7755.06    -0.21   -1841.55    -0.11
    11   2.0376   7753.34    -0.05   -1841.70    -0.32
    12   2.0376   7751.75     0.10   -1841.37    -0.05
    13   2.0378   7749.58     0.24   -1841.59    -0.35
    14   2.1198   6560.16     0.08   -1730.77     0.10
    15   2.1199   6559.35    -0.12   -1730.77    -0.01
    16   2.1199   6559.49     0.08   -1730.72     0.03
    17   2.1199   6558.68    -0.07   -1730.72    -0.09
    18   2.1826   6421.09    -0.04   -1616.78    -0.11
    19   2.1826   6421.43     0.23   -1616.42     0.20
    20   2.1828   6421.57    -0.13   -1616.37    -0.01
    21   2.1828   6421.71    -0.01   -1616.31     0.04

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.

19JA145    quality flag:2

Type:       SCATNEAR  CENTAURR  SCATNEAR

axisobj        39.180    40.341    38.518
ecceobj         0.174     0.235     0.129
incobj         13.050    13.027    13.072
qmin           31.132    29.292    32.722
qmax           48.517    50.764    45.114
amean          39.486    37.858    38.704
amin           38.908    34.399    38.314
amax           40.083    40.848    39.260
emean           0.145     0.184     0.135
emin            0.040     0.101     0.109
emax            0.212     0.250     0.153
imean          14.887    15.229    16.449
imin           13.180    12.593    12.707
imax           17.187    18.079    18.479
excite_mean     0.300     0.322     0.314
fracstop        1.000     0.617     1.000
cjmean          2.947     2.923     2.927

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       177.2     171.4     177.0
kozaiamp        179.8     179.9     180.0