Orbit Fit and Astrometric record for 17RG16

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: 17RG16    
# Created Sat Dec 16 02:38:14 2017
# Orbit generated from Bernstein formalism
# Fitting   29 observations of   29
# Arc:  41.11d
# First observation: 2017/09/12
#  Last observation: 2017/10/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000288   0.130619   0.000129   0.485374   0.152008   0.000000
# Chi-squared of fit:    23.10 DOF:   52 RMS:  0.16
# Min/Max residuals:    -0.27    0.59
# Exact a, adot, b, bdot, g, gdot:
  1.613629E-05  1.542308E-01  4.867786E-05  4.945042E-01  1.594622E-01 -1.397572E-02
# Covariance matrix:
  1.7634E-13  1.8172E-11 -1.5761E-15  1.8489E-13  4.3311E-12  6.2335E-11
  1.8172E-11  1.5748E-08  3.1237E-11 -2.8807E-09  2.7371E-09 -1.1441E-09
 -1.5761E-15  3.1237E-11  1.7787E-13 -9.2349E-12  4.8199E-12 -4.3059E-11
  1.8489E-13 -2.8807E-09 -9.2349E-12  7.8263E-10 -4.4388E-10  4.0113E-09
  4.3311E-12  2.7371E-09  4.8199E-12 -4.4388E-10  4.9179E-10  7.9116E-10
  6.2335E-11 -1.1441E-09 -4.3059E-11  4.0113E-09  7.9116E-10  6.5178E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
  -34.467050   -7.980152    0.036657   -0.569864   -0.830376  2458008.925401
# Heliocentric elements and errors
Epoch:              2458000.5000  =  2017/09/04
Mean Anomaly:            0.10854 +/-     0.002
Argument of Peri:      323.12026 +/-     0.060
Long of Asc Node:        0.56152 +/-     0.007
Inclination:            74.87479 +/-     0.012
Eccentricity:         0.90616966 +/-    0.0006
Semi-Major Axis:     75.72794415 +/-    0.5266
Time of Perihelion: 2457927.9290 +/-       0.8
Perihelion:           7.10557885 +/-    0.0692
Aphelion:           144.35030945 +/-    1.0050
Period (y)              659.0107 +/-      6.87
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            6.11018696 +/-    0.0007
Ecliptic Y           -0.89935852 +/-    0.0001
Ecliptic Z           -3.54872972 +/-    0.0005
Ecliptic XDOT         0.00493504 +/-    0.0000
Ecliptic YDOT         0.00197714 +/-    0.0000
Ecliptic ZDOT         0.00713551 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.12297080 +/-    0.0007
Geocenter to KBO      6.27107672 +/-    0.0009
# Hcoef: 11.51

The following table shows the complete astrometric record for 17RG16. 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 (17RG16) followed by the observatory code and reference code for the source of the astrometry.

2017 09  12.42460  00 33 28.345  -34 23 08.68  20.0i 17RG16    F51  C~2KwB      
2017 09  12.43363  00 33 27.943  -34 23 08.45  20.1i 17RG16    F51  C~2KwB      
2017 09  12.44261  00 33 27.543  -34 23 08.51  19.9i 17RG16    F51  C~2KwB      
2017 09  12.45162  00 33 27.144  -34 23 08.46  19.9i 17RG16    F51  C~2KwB      
2017 09  14.074205 00 32 15.12   -34 22 41.7   19.9G 17RG16    K91  C~2KwB      
2017 09  14.077852 00 32 14.95   -34 22 41.6   19.7G 17RG16    K91  C~2KwB      
2017 09  14.081501 00 32 14.79   -34 22 41.5   19.7G 17RG16    K91  C~2KwB      
2017 09  14.085146 00 32 14.62   -34 22 41.3   19.8G 17RG16    K91  C~2KwB      
2017 09  16.55904  00 30 23.91   -34 21 32.5   19.8R 17RG16    474  C~2KwB      
2017 09  16.56256  00 30 23.69   -34 21 32.7   19.7R 17RG16    474  C~2KwB      
2017 09  16.56608  00 30 23.56   -34 21 32.5   19.6R 17RG16    474  C~2KwB      
2017 09  16.56889  00 30 23.40   -34 21 32.5   19.3R 17RG16    474  C~2KwB      
2017 09  18.33115  00 29 03.78   -34 20 21.5   19.6V 17RG16    807  C~2KwB      
2017 09  18.33285  00 29 03.71   -34 20 21.2   19.8V 17RG16    807  C~2KwB      
2017 09  18.33458  00 29 03.63   -34 20 21.1   19.9V 17RG16    807  C~2KwB      
2017 09  20.500589 00 27 25.324  -34 18 29.27  19.4G 17RG16    568  C~2KwB      
2017 09  20.501764 00 27 25.272  -34 18 29.20  19.3G 17RG16    568  C~2KwB      
2017 09  20.502939 00 27 25.216  -34 18 29.13  19.3G 17RG16    568  C~2KwB      
2017 09  23.407433 00 25 12.837  -34 15 11.10  19.5G 17RG16    568  C~2LVe      
2017 09  23.409574 00 25 12.740  -34 15 10.93  19.2G 17RG16    568  C~2LVe      
2017 09  23.412131 00 25 12.621  -34 15 10.80  19.9G 17RG16    568  C~2LVe      
2017 09  23.414119 00 25 12.528  -34 15 10.61  19.8G 17RG16    568  C~2LVe      
2017 10  16.49110  00 08 15.17   -33 16 07.9   19.5R 17RG16    474  C~2NQP      
2017 10  16.49533  00 08 14.98   -33 16 06.9   19.7R 17RG16    474  C~2NQP      
2017 10  16.49955  00 08 14.79   -33 16 06.0   20.0R 17RG16    474  C~2NQP      
2017 10  23.46870  00 03 41.28   -32 46 58.2   20.2R 17RG16    Q62  C~2Nqo      
2017 10  23.49034  00 03 40.46   -32 46 52.4   20.5R 17RG16    Q62  C~2Nqo      
2017 10  23.51294  00 03 39.59   -32 46 46.3   20.6R 17RG16    Q62  C~2Nqo      
2017 10  23.53214  00 03 38.84   -32 46 41.0   20.2R 17RG16    Q62  C~2Nqo      

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    -0.17       0.00     0.07
  2   0.0000     -4.26    -0.08       2.58     0.18
  3   0.0000     -8.64    -0.12       4.89     0.04
  4   0.0001    -12.96    -0.09       7.29    -0.03
  5   0.0045   -784.35     0.07     455.23    -0.27
  6   0.0045   -786.16     0.02     456.32    -0.22
  7   0.0045   -787.85     0.07     457.34    -0.24
  8   0.0045   -789.61     0.06     458.52    -0.10
  9   0.0113  -1965.11     0.59    1167.11    -0.09
 10   0.0113  -1967.61    -0.21    1168.21    -0.03
 11   0.0113  -1968.94     0.15    1169.15    -0.14
 12   0.0113  -1970.68    -0.24    1170.08    -0.04
 13   0.0162  -2808.28    -0.04    1695.53     0.16
 14   0.0162  -2808.90     0.14    1696.20     0.31
 15   0.0162  -2809.73     0.14    1696.75     0.33
 16   0.0221  -3835.51     0.03    2363.41     0.15
 17   0.0221  -3836.05     0.06    2363.77     0.13
 18   0.0221  -3836.63     0.04    2364.15     0.14
 19   0.0301  -5201.44    -0.10    3298.10    -0.04
 20   0.0301  -5202.43    -0.08    3298.80    -0.05
 21   0.0301  -5203.68    -0.11    3299.59    -0.10
 22   0.0301  -5204.62    -0.11    3300.29    -0.06
 23   0.0933 -15070.18     0.15   12108.56    -0.21
 24   0.0933 -15071.93    -0.01   12110.48    -0.10
 25   0.0933 -15073.73    -0.22   12112.32    -0.08
 26   0.1124 -17496.95     0.11   15166.22     0.10
 27   0.1124 -17504.08     0.13   15175.88     0.00
 28   0.1125 -17511.66     0.01   15186.08     0.00
 29   0.1125 -17518.17    -0.18   15194.92     0.16

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.

17RG16    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        73.236    75.778    70.859
ecceobj         0.903     0.906     0.900
incobj         75.071    75.068    75.074
qmin            6.316     5.491     5.593
qmax          170.772   254.586   356.470
amean          75.290    81.717   117.938
amin           66.049    62.626    70.859
amax           88.772   130.340   181.302
emean           0.909     0.920     0.942
emin            0.896     0.895     0.900
emax            0.927     0.956     0.967
imean          74.563    74.256    74.049
imin           73.122    72.416    72.167
imax           76.239    76.230    75.987
excite_mean     1.325     1.332     1.346
fracstop        0.022     0.052     0.056
cjmean          0.738     0.709     0.613

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       315.6     302.8     304.9
kozaiamp          7.4      18.9      15.6