Orbit Fit and Astrometric record for 17OK69

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: 17OK69    
# Created Sat Dec  4 02:14:00 2021
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   1.86y
# First observation: 2017/07/26
#  Last observation: 2019/06/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000056   0.011115   0.000002  -0.003953   0.016537   0.000000
# Chi-squared of fit:     2.35 DOF:     20 RMS:  0.08
# Min/Max residuals:    -0.14    0.15
# Exact a, adot, b, bdot, g, gdot:
  9.935955E-06  1.103568E-02 -3.454185E-06 -3.952240E-03  1.670364E-02 -2.490166E-03
# Covariance matrix:
  7.0869E-13 -2.7475E-12 -4.9891E-14  6.0173E-13  1.9231E-13 -6.8471E-11
 -2.7475E-12  1.6488E-11  4.6757E-13 -4.0362E-12  2.3975E-13  4.6051E-10
 -4.9891E-14  4.6757E-13  2.0293E-13 -2.6763E-13  6.2296E-14  1.4637E-11
  6.0173E-13 -4.0362E-12 -2.6763E-13  1.3089E-12 -1.6406E-13 -1.1724E-10
  1.9231E-13  2.3975E-13  6.2296E-14 -1.6406E-13  5.0796E-13  1.9118E-11
 -6.8471E-11  4.6051E-10  1.4637E-11 -1.1724E-10  1.9118E-11  1.3386E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   13.505379  -58.035991   -0.027861    0.236494   -0.984323  2457960.790941
# Heliocentric elements and errors
Epoch:              2457960.5000  =  2017/07/26
Mean Anomaly:          235.14022 +/-     1.339
Argument of Peri:      291.79146 +/-     1.188
Long of Asc Node:      154.53733 +/-     0.007
Inclination:            23.68863 +/-     0.004
Eccentricity:         0.28631516 +/-    0.0045
Semi-Major Axis:     50.43139385 +/-    0.1105
Time of Perihelion: 2503330.6225 +/-     463.1
Perihelion:          35.99212131 +/-    0.2403
Aphelion:            64.87066639 +/-    0.2678
Period (y)              358.1456 +/-      1.18
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           31.37397137 +/-    0.0013
Ecliptic Y          -50.23482039 +/-    0.0021
Ecliptic Z           13.98104676 +/-    0.0006
Ecliptic XDOT         0.00140917 +/-    0.0000
Ecliptic YDOT         0.00116004 +/-    0.0000
Ecliptic ZDOT        -0.00072531 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   60.85501563 +/-    0.0019
Geocenter to KBO     59.86720678 +/-    0.0026
# Hcoef:  5.79

The following table shows the complete astrometric record for 17OK69. 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 (17OK69) followed by the observatory code and reference code for the source of the astrometry.

2017 07  26.29014  20 04 49.460  -06 32 18.26  23.5r 17OK69    568  C~31Lz      
2017 07  26.48039  20 04 48.792  -06 32 20.79  23.5r 17OK69    568  C~31Lz      
2017 09  21.11600  20 02 17.531  -06 48 49.15  23.6r 17OK69    G37  C~31Lz      
2017 09  21.12891  20 02 17.514  -06 48 49.33  23.6r 17OK69    G37  C~31Lz      
2017 09  21.15699  20 02 17.475  -06 48 49.82        17OK69    G37  C~31Lz      
2017 09  21.16423  20 02 17.456  -06 48 50.19        17OK69    G37  C~31Lz      
2017 09  21.20540  20 02 17.399  -06 48 50.82        17OK69    G37  C~31Lz      
2017 09  21.21292  20 02 17.385  -06 48 50.89        17OK69    G37  C~31Lz      
2017 09  22.11356  20 02 16.117  -06 49 07.56        17OK69    G37  C~31Lz      
2018 05  16.34986  20 10 38.449  -06 32 54.19  23.5r 17OK69    304  C~31Lz      
2018 05  17.38082  20 10 37.258  -06 32 47.69  23.4r 17OK69    304  C~31Lz      
2019 06  06.330090 20 12 45.499  -06 36 46.04  23.8G 17OK69    G37  C~36sk      
2019 06  06.425150 20 12 45.282  -06 36 46.14        17OK69    G37  C~36sk      

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     0.11       0.00    -0.06
     2   0.0005    -10.26    -0.10      -0.36     0.05
     3   0.1556  -2421.88    -0.05    -490.18    -0.01
     4   0.1556  -2422.17    -0.00    -490.31     0.04
     5   0.1557  -2422.84     0.05    -490.66     0.06
     6   0.1557  -2423.19    -0.11    -490.97    -0.14
     7   0.1558  -2424.16    -0.01    -491.40    -0.03
     8   0.1558  -2424.37    -0.04    -491.43     0.05
     9   0.1583  -2446.35     0.15    -503.75     0.06
    10   0.8051   5074.38     0.11   -1145.02     0.05
    11   0.8079   5058.43    -0.11   -1134.86    -0.09
    12   1.8618   6874.88     0.04   -1779.53     0.06
    13   1.8621   6871.70    -0.04   -1778.93    -0.05

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.

17OK69    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        50.372    50.722    50.077
ecceobj         0.292     0.306     0.279
incobj         23.616    23.625    23.607
qmin           35.335    34.604    35.329
qmax           66.246    67.647    65.631
amean          50.412    50.800    50.161
amin           49.891    50.287    49.705
amax           51.027    51.407    50.743
emean           0.275     0.296     0.273
emin            0.256     0.275     0.255
emax            0.298     0.318     0.293
imean          23.254    23.082    22.894
imin           22.486    22.299    22.194
imax           23.835    23.765    23.372
excite_mean     0.481     0.491     0.475
fracstop        1.000     1.000     1.000
cjmean          2.883     2.875     2.888

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       178.8     175.8     179.9
kozaiamp        180.0     180.0     180.0