Orbit Fit and Astrometric record for 17SE279

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: 17SE279   
# Created Tue Dec  7 02:14:11 2021
# Orbit generated from Bernstein formalism
# Fitting     11 observations of     11
# Arc:   2.09y
# First observation: 2016/09/26
#  Last observation: 2018/10/28
Preliminary a, adot, b, bdot, g, gdot:
  -0.000033   0.033460   0.000015  -0.001841   0.027692   0.000000
# Chi-squared of fit:     6.88 DOF:     16 RMS:  0.14
# Min/Max residuals:    -0.29    0.29
# Exact a, adot, b, bdot, g, gdot:
  2.042080E-05  3.296365E-02 -1.573561E-06 -1.869951E-03  2.585888E-02 -8.110347E-03
# Covariance matrix:
  4.8757E-13 -7.4700E-13 -1.0044E-14  3.1849E-14 -3.1609E-13 -7.5293E-12
 -7.4700E-13  3.1219E-12  6.2382E-14 -1.2200E-13  3.4927E-12  4.0183E-11
 -1.0044E-14  6.2382E-14  3.8214E-13 -2.4124E-13  9.0719E-14  8.4243E-13
  3.1849E-14 -1.2200E-13 -2.4124E-13  2.4148E-13  2.8362E-14 -1.9745E-12
 -3.1609E-13  3.4927E-12  9.0719E-14  2.8362E-14  9.2309E-12  4.0570E-11
 -7.5293E-12  4.0183E-11  8.4243E-13 -1.9745E-12  4.0570E-11  5.7103E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   11.668023  -33.110071   -0.597984    0.163874   -0.792682  2457657.568219
# Heliocentric elements and errors
Epoch:              2457650.5000  =  2016/09/19
Mean Anomaly:          356.79102 +/-     0.017
Argument of Peri:      137.15892 +/-     0.077
Long of Asc Node:      220.66386 +/-     0.004
Inclination:            11.94342 +/-     0.000
Eccentricity:         0.73883712 +/-    0.0009
Semi-Major Axis:    142.29347335 +/-    0.4703
Time of Perihelion: 2463176.8805 +/-      11.6
Perihelion:          37.16177269 +/-    0.1784
Aphelion:           247.42517401 +/-    0.8280
Period (y)             1697.4058 +/-      8.42
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.72421096 +/-    0.0037
Ecliptic Y          -20.63162079 +/-    0.0024
Ecliptic Z            7.82086487 +/-    0.0009
Ecliptic XDOT         0.00123742 +/-    0.0000
Ecliptic YDOT         0.00335398 +/-    0.0000
Ecliptic ZDOT        -0.00036759 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.46775503 +/-    0.0033
Geocenter to KBO     38.67143054 +/-    0.0045
# Hcoef:  7.67

The following table shows the complete astrometric record for 17SE279. 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 (17SE279) followed by the observatory code and reference code for the source of the astrometry.

2016 09  26.06743  21 40 35.222  -01 33 40.00  23.3r 17SE279   W84  C~55do      
2016 09  26.06881  21 40 35.230  -01 33 39.99  23.2i 17SE279   W84  C~55do      
2016 09  26.07017  21 40 35.213  -01 33 40.15  24.5g 17SE279   W84  C~55do      
2017 09  27.08187  21 47 51.763  -01 02 08.06  23.5i 17SE279   W84  C~55do      
2017 10  10.10439  21 47 15.847  -01 08 31.76  23.8r 17SE279   W84  C~55do      
2017 10  11.12015  21 47 13.552  -01 09 00.44  23.3i 17SE279   W84  C~55do      
2017 10  21.04069  21 46 56.019  -01 13 26.12  23.9i 17SE279   W84  C~55do      
2017 10  22.03949  21 46 54.713  -01 13 51.38  23.8r 17SE279   W84  C~55do      
2018 09  18.20691  21 55 50.585  -00 24 53.46  22.8z 17SE279   W84  C~55do      
2018 10  28.00559  21 54 10.300  -00 44 03.73  22.8i 17SE279   W84  C~55do      
2018 10  28.00698  21 54 10.292  -00 44 03.88  24.0r 17SE279   W84  C~55do      

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    -0.05       0.00     0.09
     2   0.0000      0.12     0.14      -0.03     0.07
     3   0.0000     -0.18    -0.08      -0.10     0.02
     4   1.0021   6804.99    -0.29    -400.99    -0.12
     5   1.0377   6168.51     0.20    -582.84    -0.21
     6   1.0405   6126.45    -0.20    -598.38    -0.09
     7   1.0677   5789.61     0.29    -761.05     0.04
     8   1.0704   5762.69    -0.01    -778.33     0.02
     9   1.9771  14341.20     0.18    -696.11    -0.01
    10   2.0861  12531.35    -0.02   -1278.09     0.13
    11   2.0861  12531.18    -0.15   -1278.20     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.

17SE279    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       146.318   147.527   145.135
ecceobj         0.747     0.749     0.744
incobj         11.943    11.943    11.942
qmin           35.658    35.743    35.637
qmax          261.827   270.081   270.619
amean         142.567   146.280   146.142
amin          137.427   141.292   139.890
amax          149.538   153.669   153.821
emean           0.738     0.745     0.745
emin            0.725     0.734     0.731
emax            0.752     0.758     0.759
imean          12.975    13.151    13.019
imin           12.046    12.035    12.049
imax           13.972    13.731    13.959
excite_mean     0.772     0.779     0.778
fracstop        1.000     1.000     1.000
cjmean          3.071     3.071     3.071

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       213.3     192.4     209.9
kozaiamp         77.6      58.2      71.9