Orbit Fit and Astrometric record for 17DO121

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: 17DO121   
# Created Thu Mar 28 01:18:56 2024
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   1.04y
# First observation: 2017/02/24
#  Last observation: 2018/03/12
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.011098  -0.000002   0.002267   0.016010   0.000000
# Chi-squared of fit:    21.04 DOF:     20 RMS:  0.22
# Min/Max residuals:    -0.41    0.48
# Exact a, adot, b, bdot, g, gdot:
  1.131379E-05  1.113388E-02  5.383547E-07  2.268940E-03  1.614904E-02 -8.483214E-04
# Covariance matrix:
  7.3908E-13  4.2069E-12  3.4593E-14  1.1630E-12  3.1161E-12  5.4767E-10
  4.2069E-12  1.5283E-09 -9.8455E-12  3.9313E-10  7.2507E-10  1.7822E-07
  3.4593E-14 -9.8455E-12  4.3228E-13 -2.8955E-12 -4.5075E-12 -1.1459E-09
  1.1630E-12  3.9313E-10 -2.8955E-12  1.0169E-10  1.8655E-10  4.5861E-08
  3.1161E-12  7.2507E-10 -4.5075E-12  1.8655E-10  3.4656E-10  8.4623E-08
  5.4767E-10  1.7822E-07 -1.1459E-09  4.5861E-08  8.4623E-08  2.0792E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
   11.624410  143.061704   -0.210495    0.194797   -0.946107  2457808.829281
# Heliocentric elements and errors
Epoch:              2457800.5000  =  2017/02/16
Mean Anomaly:          203.95449 +/-    80.306
Argument of Peri:      209.57261 +/-    80.352
Long of Asc Node:       98.91801 +/-     0.246
Inclination:            16.15591 +/-     0.067
Eccentricity:         0.21658510 +/-    0.0881
Semi-Major Axis:     52.22586524 +/-    2.0753
Time of Perihelion: 2517555.6934 +/-   30545.0
Perihelion:          40.91452079 +/-    4.8809
Aphelion:            63.53720968 +/-    5.2493
Period (y)              377.4302 +/-     22.50
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -49.38123155 +/-    0.0559
Ecliptic Y           36.85715704 +/-    0.0420
Ecliptic Z           12.47724854 +/-    0.0144
Ecliptic XDOT        -0.00095665 +/-    0.0006
Ecliptic YDOT        -0.00164662 +/-    0.0005
Ecliptic ZDOT         0.00034773 +/-    0.0002
# Distances at JD0 (AU)
Heliocenter to KBO   62.87000704 +/-    0.0504
Geocenter to KBO     61.92319865 +/-    0.0714
# Hcoef:  7.62

The following table shows the complete astrometric record for 17DO121. 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 (17DO121) followed by the observatory code and reference code for the source of the astrometry.

2017 02  24.32848  09 58 16.325  +24 46 19.86  25.5r 17DO121   568  C~2b81      
2017 02  24.50303  09 58 15.711  +24 46 22.87  25.5r 17DO121   568  C~2b81      
2017 04  22.03820  09 55 48.388  +24 52 56.64        17DO121   304  C~2b81      
2017 04  23.03952  09 55 47.155  +24 52 52.94        17DO121   304  C~2b81      
2017 04  24.02601  09 55 46.059  +24 52 48.57  25.6r 17DO121   304  C~2b81      
2018 03  11.09337  10 00 17.363  +24 43 42.53        17DO121   304  C~2b81      
2018 03  11.10141  10 00 17.334  +24 43 42.90        17DO121   304  C~2b81      
2018 03  11.15334  10 00 17.172  +24 43 42.99  25.5r 17DO121   304  C~2b81      
2018 03  11.16131  10 00 17.143  +24 43 43.12        17DO121   304  C~2b81      
2018 03  12.06672  10 00 14.256  +24 43 54.54        17DO121   304  C~2b81      
2018 03  12.07462  10 00 14.235  +24 43 54.74        17DO121   304  C~2b81      
2018 03  12.13219  10 00 14.040  +24 43 55.24        17DO121   304  C~2b81      
2018 03  12.14010  10 00 14.004  +24 43 55.35        17DO121   304  C~2b81      

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     0.35
     2   0.0005     -8.89    -0.05      -0.11     0.48
     3   0.1553  -2026.21     0.12    -328.98    -0.27
     4   0.1580  -2040.67    -0.23    -338.26    -0.31
     5   0.1607  -2053.16     0.27    -347.52    -0.41
     6   1.0397   1598.74    -0.18     432.92    -0.01
     7   1.0398   1598.24    -0.31     433.13     0.23
     8   1.0399   1596.14     0.00     432.43    -0.26
     9   1.0399   1595.73    -0.05     432.42    -0.24
    10   1.0424   1554.89     0.15     429.19     0.14
    11   1.0424   1554.55     0.18     429.28     0.26
    12   1.0426   1551.89     0.16     428.81     0.03
    13   1.0426   1551.39     0.02     428.74    -0.00

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.

17DO121    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