Orbit Fit and Astrometric record for 17BY244

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: 17BY244   
# Created Tue Apr  1 01:11:02 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   3.00y
# First observation: 2016/04/02
#  Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000095   0.024217  -0.000002  -0.000062   0.024017   0.000000
# Chi-squared of fit:    13.77 DOF:     30 RMS:  0.15
# Min/Max residuals:    -0.33    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.540397E-05  2.403748E-02  3.171675E-09 -6.307351E-05  2.446051E-02 -1.496622E-03
# Covariance matrix:
  6.3137E-13 -1.9765E-12  6.4395E-15  3.1625E-15  1.9379E-13 -2.4312E-11
 -1.9765E-12  8.2303E-12 -3.2666E-14 -1.2304E-14 -1.1320E-12  1.0505E-10
  6.4395E-15 -3.2666E-14  1.7661E-13 -1.0642E-13  7.6666E-15 -4.1919E-13
  3.1625E-15 -1.2304E-14 -1.0642E-13  1.2094E-13  7.9377E-16 -1.6057E-13
  1.9379E-13 -1.1320E-12  7.6666E-15  7.9377E-16  3.4907E-13 -1.4420E-11
 -2.4312E-11  1.0505E-10 -4.1919E-13 -1.6057E-13 -1.4420E-11  1.3612E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.091276 -175.352550   -0.141226    0.036102   -0.984894  2457480.915394
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          303.23806 +/-     0.624
Argument of Peri:      157.99110 +/-     0.813
Long of Asc Node:       90.35748 +/-     0.023
Inclination:             2.04816 +/-     0.000
Eccentricity:         0.06731130 +/-    0.0013
Semi-Major Axis:     43.32484469 +/-    0.0062
Time of Perihelion: 2473903.7339 +/-     180.6
Perihelion:          40.40859307 +/-    0.0556
Aphelion:            46.24109632 +/-    0.0557
Period (y)              285.1765 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.69525705 +/-    0.0010
Ecliptic Y           -3.53353924 +/-    0.0001
Ecliptic Z            1.49188061 +/-    0.0000
Ecliptic XDOT         0.00038470 +/-    0.0000
Ecliptic YDOT        -0.00267509 +/-    0.0000
Ecliptic ZDOT        -0.00001316 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.87130363 +/-    0.0010
Geocenter to KBO     40.88222123 +/-    0.0010
# Hcoef:  9.18

The following table shows the complete astrometric record for 17BY244. 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 (17BY244) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.414605 12 20 22.76   +00 04 22.4         17BY244   T09  C~89UU      
2016 04  02.469027 12 20 22.52   +00 04 24.0         17BY244   T09  C~89UU      
2016 06  05.317193 12 17 05.18   +00 23 32.2         17BY244   T09  C~89UU      
2016 06  05.33917  12 17 05.14   +00 23 31.9   25.8r 17BY244   T09  C~8COq      
2016 06  05.356114 12 17 05.13   +00 23 31.9         17BY244   T09  C~89UU      
2017 01  23.60759  12 29 30.51   -00 56 37.4   25.6i 17BY244   T09  C~89UU      
2017 01  23.62095  12 29 30.48   -00 56 37.6   25.1i 17BY244   T09  C~89UU      
2017 01  23.64653  12 29 30.45   -00 56 36.9   25.3i 17BY244   T09  C~89UU      
2017 01  28.59808  12 29 22.23   -00 55 29.9   25.2z 17BY244   T09  C~89UU      
2017 01  28.60345  12 29 22.21   -00 55 29.7   25.1z 17BY244   T09  C~89UU      
2017 01  28.61691  12 29 22.21   -00 55 29.4   25.4z 17BY244   T09  C~89UU      
2017 01  28.65069  12 29 22.16   -00 55 28.9   24.7z 17BY244   T09  C~89UU      
2017 02  01.662482 12 29 13.97   -00 54 25.2         17BY244   T09  C~89UU      
2017 02  02.636127 12 29 11.82   -00 54 08.7         17BY244   T09  C~89UU      
2017 02  23.521659 12 28 09.32   -00 46 38.0         17BY244   T09  C~89UU      
2017 02  23.605904 12 28 09.00   -00 46 35.7         17BY244   T09  C~89UU      
2019 04  03.440043 12 35 37.03   -01 34 57.1         17BY244   T09  C~89UU      
2019 04  03.464217 12 35 36.92   -01 34 56.4         17BY244   T09  C~89UU      

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    -0.01
     2   0.0001     -3.94     0.10       0.04     0.08
     3   0.1750  -3176.91    -0.02    -119.37     0.12
     4   0.1750  -3177.34    -0.11    -119.89    -0.32
     5   0.1751  -3177.48     0.01    -119.95    -0.33
     6   0.8109   8999.29    -0.10    -103.41     0.29
     7   0.8110   8998.95    -0.09    -103.77    -0.10
     8   0.8110   8998.26    -0.12    -103.31     0.31
     9   0.8246   8858.26    -0.05     -90.62    -0.16
    10   0.8246   8857.90    -0.23     -90.56    -0.10
    11   0.8246   8857.79     0.09     -90.28     0.15
    12   0.8247   8856.90     0.31     -90.12     0.24
    13   0.8357   8718.63    -0.18     -80.29    -0.03
    14   0.8384   8682.42     0.13     -77.92    -0.05
    15   0.8956   7641.53     0.20     -35.51    -0.03
    16   0.8958   7636.21     0.04     -35.30     0.08
    17   3.0008  14977.61    -0.00     -38.79    -0.07
    18   3.0008  14975.81     0.01     -38.80    -0.06

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.

17BY244    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        42.868    42.898    42.839
ecceobj         0.062     0.059     0.065
incobj          2.048     2.048     2.048
qmin           39.796    39.948    39.629
qmax           46.586    46.435    46.693
amean          43.081    43.111    43.052
amin           42.750    42.777    42.722
amax           43.430    43.458    43.405
emean           0.053     0.050     0.056
emin            0.032     0.030     0.035
emax            0.073     0.069     0.076
imean           1.012     0.980     1.049
imin            0.515     0.526     0.493
imax            1.444     1.377     1.537
excite_mean     0.056     0.053     0.060
fracstop        1.000     1.000     1.000
cjmean          3.087     3.088     3.086

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       178.1     182.1     175.8
kozaiamp        180.0     180.0     179.9