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 Fri Jul 20 01:38:25 2018
# Orbit generated from Bernstein formalism
# Fitting   56 observations of   56
# Arc: 165.57d
# First observation: 2017/08/06
#  Last observation: 2018/01/19
Preliminary a, adot, b, bdot, g, gdot:
  -0.011345   0.174429   0.010156   0.405370   0.149825   0.000000
# Chi-squared of fit:   146.07 DOF:  106 RMS:  0.29
# Min/Max residuals:    -0.95    1.09
# Exact a, adot, b, bdot, g, gdot:
  1.253609E-05  1.233473E-01  5.058012E-05  4.875350E-01  1.545894E-01 -4.500745E-03
# Covariance matrix:
  2.2971E-13 -3.5434E-14 -2.3632E-14  7.1932E-13  3.3194E-13  3.8930E-12
 -3.5434E-14  1.1250E-11  1.0515E-12 -8.6438E-12  1.6544E-12 -2.0375E-11
 -2.3632E-14  1.0515E-12  2.2783E-13 -1.6618E-12  6.1739E-14 -4.0824E-12
  7.1932E-13 -8.6438E-12 -1.6618E-12  1.6531E-11  6.3348E-13  5.1613E-11
  3.3194E-13  1.6544E-12  6.1739E-14  6.3348E-13  8.9932E-13  6.2687E-12
  3.8930E-12 -2.0375E-11 -4.0824E-12  5.1613E-11  6.2687E-12  1.9722E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -36.099173   -2.657433    0.690653   -0.435893   -0.597939  2457972.024981
# Heliocentric elements and errors
Epoch:              2457970.5000  =  2017/08/05
Mean Anomaly:            0.06397 +/-     0.000
Argument of Peri:      323.04690 +/-     0.003
Long of Asc Node:        0.54451 +/-     0.000
Inclination:            74.90286 +/-     0.000
Eccentricity:         0.90740272 +/-    0.0000
Semi-Major Axis:     76.74981148 +/-    0.0300
Time of Perihelion: 2457926.8628 +/-       0.0
Perihelion:           7.10682354 +/-    0.0039
Aphelion:           146.39279941 +/-    0.0572
Period (y)              672.3945 +/-      0.39
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            5.92587634 +/-    0.0000
Ecliptic Y           -0.97180542 +/-    0.0000
Ecliptic Z           -3.81098089 +/-    0.0000
Ecliptic XDOT         0.00512346 +/-    0.0000
Ecliptic YDOT         0.00194349 +/-    0.0000
Ecliptic ZDOT         0.00702350 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.11224237 +/-    0.0000
Geocenter to KBO      6.46874974 +/-    0.0000
# Hcoef: 11.54

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 08  06.52418  00 55 39.995  -33 44 34.65  19.7i 17RG16    F51  C~2Y59      
2017 08  06.53399  00 55 39.743  -33 44 35.50  19.7i 17RG16    F51  C~2Y59      
2017 08  06.54377  00 55 39.501  -33 44 36.46  19.7i 17RG16    F51  C~2Y59      
2017 08  06.55357  00 55 39.259  -33 44 37.56  19.7i 17RG16    F51  C~2Y59      
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  19.54301  00 28 08.94   -34 19 21.4         17RG16    Q62  C~2Uf0      
2017 09  19.54627  00 28 08.80   -34 19 20.8   19.4w 17RG16    Q62  C~2Uf0      
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      
2017 11  11.42703  23 53 34.82   -31 04 57.5   19.7R 17RG16    474  C~2PmI      
2017 11  11.43103  23 53 34.71   -31 04 56.0   20.1R 17RG16    474  C~2PmI      
2017 11  11.43503  23 53 34.62   -31 04 54.5   20.3R 17RG16    474  C~2PmI      
2017 12  07.11078  23 46 15.19   -28 08 43.8         17RG16    691  C~2SFX      
2017 12  07.12293  23 46 15.12   -28 08 39.2   20.6R 17RG16    691  C~2SFX      
2017 12  07.13491  23 46 15.06   -28 08 33.5         17RG16    691  C~2SFX      
2017 12  19.07943  23 45 20.65   -26 38 10.6   20.1R 17RG16    691  C~2TL7      
2017 12  19.09058  23 45 20.63   -26 38 04.3   19.9R 17RG16    691  C~2TL8      
2017 12  19.10084  23 45 20.63   -26 38 00.9   20.7R 17RG16    691  C~2TL8      
2017 12  21.10725  23 45 20.14   -26 22 32.8   20.2R 17RG16    691  C~2TL8      
2017 12  21.11869  23 45 20.11   -26 22 28.0   20.7R 17RG16    691  C~2TL8      
2017 12  21.13016  23 45 20.11   -26 22 22.2   20.5R 17RG16    691  C~2TL8      
2018 01  05.08892  23 46 26.82   -24 25 54.7   20.8V 17RG16    691  C~2Uf0      
2018 01  05.09743  23 46 26.90   -24 25 50.8   20.9V 17RG16    691  C~2Uf0      
2018 01  05.10585  23 46 27.04   -24 25 46.8   20.3V 17RG16    691  C~2Uf0      
2018 01  06.07201  23 46 35.22   -24 18 13.9   20.3V 17RG16    691  C~2V02      
2018 01  06.08492  23 46 35.35   -24 18 07.7   20.3V 17RG16    691  C~2V02      
2018 01  06.09760  23 46 35.48   -24 18 01.5   20.8V 17RG16    691  C~2V02      
2018 01  19.07677  23 49 06.65   -22 36 52.0   20.2R 17RG16    691  C~2VWy      
2018 01  19.08448  23 49 06.72   -22 36 48.5   20.3R 17RG16    691  C~2VWy      
2018 01  19.09215  23 49 06.83   -22 36 44.4   20.3R 17RG16    691  C~2VWy      

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     0.02       0.00    -0.15
  2   0.0000     -3.17     0.13       0.76     0.01
  3   0.0001     -6.28     0.29       1.35     0.01
  4   0.0001     -9.45     0.39       1.83    -0.11
  5   0.1010 -15827.14    -0.31    5460.71     0.17
  6   0.1011 -15831.57    -0.22    5463.07     0.28
  7   0.1011 -15836.09    -0.26    5465.15     0.13
  8   0.1011 -15840.56    -0.22    5467.33     0.07
  9   0.1055 -16640.54    -0.03    5875.66    -0.23
 10   0.1056 -16642.41    -0.09    5876.66    -0.19
 11   0.1056 -16644.17    -0.03    5877.60    -0.20
 12   0.1056 -16646.01    -0.05    5878.68    -0.06
 13   0.1123 -17867.58     0.50    6527.54    -0.11
 14   0.1124 -17870.15    -0.31    6528.52    -0.09
 15   0.1124 -17871.54     0.06    6529.39    -0.18
 16   0.1124 -17873.35    -0.34    6530.23    -0.10
 17   0.1172 -18745.71    -0.14    7013.63     0.06
 18   0.1172 -18746.38     0.04    7014.27     0.22
 19   0.1172 -18747.24     0.04    7014.78     0.24
 20   0.1205 -19343.37     0.24    7355.47     0.34
 21   0.1205 -19344.71     0.53    7356.74     0.68
 22   0.1231 -19817.80    -0.05    7630.54     0.00
 23   0.1231 -19818.37    -0.03    7630.88    -0.01
 24   0.1231 -19818.98    -0.05    7631.23    -0.00
 25   0.1311 -21247.57    -0.11    8498.60    -0.01
 26   0.1311 -21248.61    -0.08    8499.26    -0.02
 27   0.1311 -21249.92    -0.12    8499.99    -0.07
 28   0.1311 -21250.90    -0.11    8500.64    -0.03
 29   0.1943 -31750.86     0.14   16883.36    -0.29
 30   0.1943 -31752.76    -0.03   16885.22    -0.19
 31   0.1943 -31754.69    -0.24   16886.99    -0.18
 32   0.2134 -34401.51     0.17   19860.62     0.24
 33   0.2135 -34409.34     0.20   19870.07     0.15
 34   0.2135 -34417.67     0.07   19880.04     0.14
 35   0.2136 -34424.83    -0.13   19888.67     0.29
 36   0.2653 -39735.56    -0.20   28629.54    -0.19
 37   0.2653 -39736.43    -0.24   28631.52    -0.15
 38   0.2653 -39737.05    -0.04   28633.40    -0.20
 39   0.3356 -41831.56    -0.39   41124.04     0.04
 40   0.3357 -41830.95    -0.16   41128.95    -0.95
 41   0.3357 -41829.83     0.58   41134.90    -0.82
 42   0.3684 -40739.23     0.18   46810.51    -0.09
 43   0.3684 -40737.39     0.50   46816.92     1.09
 44   0.3685 -40736.25     0.23   46820.32    -0.32
 45   0.3739 -40430.81     0.47   47752.17     0.09
 46   0.3740 -40429.60    -0.10   47757.13    -0.27
 47   0.3740 -40427.65     0.07   47762.94     0.20
 48   0.4150 -37141.78    -0.49   54444.18     0.24
 49   0.4150 -37139.34    -0.35   54447.69     0.07
 50   0.4150 -37136.04     0.67   54450.98    -0.29
 51   0.4177 -36867.74    -0.45   54864.93    -0.05
 52   0.4177 -36863.81    -0.10   54870.50    -0.04
 53   0.4177 -36859.89     0.31   54876.07     0.07
 54   0.4533 -32648.99     0.21   60201.20     0.00
 55   0.4533 -32646.78    -0.35   60204.37     0.11
 56   0.4533 -32643.80    -0.13   60207.93     0.63

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        74.228    74.383    74.075
ecceobj         0.904     0.905     0.904
incobj         75.098    75.098    75.099
qmin            6.335     5.357     5.909
qmax          149.160   196.220   170.536
amean          71.385    77.269    71.247
amin           63.368    54.335    51.778
amax           78.164   101.366    88.649
emean           0.905     0.917     0.907
emin            0.892     0.897     0.879
emax            0.912     0.936     0.924
imean          74.940    74.390    74.652
imin           73.778    73.283    73.675
imax           76.282    76.305    76.266
excite_mean     1.323     1.330     1.324
fracstop        0.017     0.045     0.034
cjmean          0.750     0.726     0.759

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       315.3     302.3     308.0
kozaiamp          8.2      23.9      18.2