Orbit Fit and Astrometric record for 17YG5

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: 17YG5     
# Created Sat Nov 27 02:14:08 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     63 observations of     63
# Arc:   3.33y
# First observation: 2017/12/14
#  Last observation: 2021/04/14
# Chi-squared of fit:    57.27 DOF:    120 RMS:  0.17
# Min/Max residuals:    -0.73    0.51
# Exact a, adot, b, bdot, g, gdot:
  3.855268E-05  3.222285E-01 -8.577659E-06 -6.314287E-02  1.241658E-01 -1.386699E-01
# Covariance matrix:
  6.8189E-14 -4.0241E-14 -3.3078E-15  4.7358E-15 -4.7857E-15 -5.6444E-15
 -4.0241E-14  3.8581E-14  4.6226E-15 -6.6117E-15  7.1998E-15  7.6398E-15
 -3.3078E-15  4.6226E-15  5.2019E-14 -1.7889E-14  1.2486E-15  1.0160E-15
  4.7358E-15 -6.6117E-15 -1.7889E-14  7.6015E-15 -1.7423E-15 -1.4682E-15
 -4.7857E-15  7.1998E-15  1.2486E-15 -1.7423E-15  5.3751E-15  4.0103E-16
 -5.6444E-15  7.6398E-15  1.0160E-15 -1.4682E-15  4.0103E-16  2.2517E-15
#      lat0       lon0       xBary       yBary       zBary        JD0
  -24.089782   86.244247    0.068333   -0.403232   -0.902282  2458101.912231
# Heliocentric elements and errors
Epoch:              2458102.5000  =  2017/12/15
Mean Anomaly:          358.49349 +/-     0.000
Argument of Peri:      296.53109 +/-     0.000
Long of Asc Node:      201.98538 +/-     0.000
Inclination:            23.72933 +/-     0.000
Eccentricity:         0.89141577 +/-    0.0000
Semi-Major Axis:     68.21399703 +/-    0.0005
Time of Perihelion: 2458963.6477 +/-       2.3
Perihelion:           7.40696445 +/-    0.0002
Aphelion:           129.02102960 +/-    0.0010
Period (y)              563.4021 +/-      0.01
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            0.61230849 +/-    0.0000
Ecliptic Y            8.31217065 +/-    0.0000
Ecliptic Z           -3.28738820 +/-    0.0000
Ecliptic XDOT        -0.00730423 +/-    0.0000
Ecliptic YDOT        -0.00289217 +/-    0.0000
Ecliptic ZDOT        -0.00002314 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    8.95972230 +/-    0.0000
Geocenter to KBO      8.05392516 +/-    0.0000
# Hcoef: 12.39

The following table shows the complete astrometric record for 17YG5. 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 (17YG5) followed by the observatory code and reference code for the source of the astrometry.

2017 12  14.41143  05 46 17.149  -00 41 42.69        17YG5     F51  C~2TwN      
2017 12  14.41143  05 46 17.161  -00 41 42.64        17YG5     F51  C~3TH8      
2017 12  14.42474  05 46 16.888  -00 41 43.34        17YG5     F51  C~2TwN      
2017 12  14.42474  05 46 16.914  -00 41 43.60        17YG5     F51  C~3TH8      
2017 12  14.43803  05 46 16.660  -00 41 44.40        17YG5     F51  C~2TwN      
2017 12  14.43803  05 46 16.647  -00 41 44.64        17YG5     F51  C~3TH8      
2017 12  14.45135  05 46 16.429  -00 41 45.08        17YG5     F51  C~2TwN      
2017 12  14.45135  05 46 16.397  -00 41 45.65        17YG5     F51  C~3TH8      
2017 12  23.35957  05 43 38.805  -00 47 39.07  22.1w 17YG5     F51  C~2TwN      
2017 12  23.38296  05 43 38.394  -00 47 39.54  21.9w 17YG5     F51  C~2TwN      
2017 12  23.39469  05 43 38.169  -00 47 39.70  21.9w 17YG5     F51  C~2TwN      
2017 12  25.20060  05 43 06.36   -00 48 19.6   22.1G 17YG5     807  C~2TwN      
2017 12  25.20704  05 43 06.24   -00 48 19.7   21.9G 17YG5     807  C~2TwN      
2017 12  25.21349  05 43 06.11   -00 48 19.6   21.9G 17YG5     807  C~2TwN      
2017 12  25.42024  05 43 02.513  -00 48 24.36  22.3w 17YG5     F51  C~2TwN      
2017 12  25.43235  05 43 02.303  -00 48 24.69  22.6w 17YG5     F51  C~2TwN      
2017 12  25.44450  05 43 02.078  -00 48 25.00  22.0w 17YG5     F51  C~2TwN      
2017 12  25.45671  05 43 01.865  -00 48 25.14  22.3w 17YG5     F51  C~2TwN      
2017 12  26.40133  05 42 45.29   -00 48 41.6         17YG5     291  C~2TwN      
2017 12  26.44019  05 42 44.60   -00 48 42.2   22.4R 17YG5     291  C~2TwN      
2019 02  16.06942  06 54 08.04   -03 27 43.2   21.0R 17YG5     304  C~2zsr      
2019 02  16.13653  06 54 07.41   -03 27 33.2   21.6R 17YG5     304  C~2zsr      
2019 02  20.13986  06 53 35.41   -03 17 34.4   21.4R 17YG5     304  C~2zsr      
2019 02  20.14770  06 53 35.35   -03 17 33.5   20.9R 17YG5     304  C~2zsr      
2019 04  05.147990 06 56 17.931  -01 16 37.44  21.8G 17YG5     G37  C~34cK      
2019 04  05.193990 06 56 18.565  -01 16 30.19        17YG5     G37  C~34cL      
2019 11  28.542214 08 52 44.080  -07 15 50.49  21.3G 17YG5     568  C~3d0B      
2019 11  28.544782 08 52 44.085  -07 15 50.95  21.4G 17YG5     568  C~3d0B      
2019 11  28.547350 08 52 44.091  -07 15 51.37  21.4G 17YG5     568  C~3d0B      
2020 01  18.324570 08 45 29.290  -08 16 28.16  21.6G 17YG5     G37  C~3k67      
2020 01  18.357850 08 45 28.732  -08 16 27.03        17YG5     G37  C~3k67      
2020 01  22.12805  08 44 24.70   -08 13 13.7   20.9G 17YG5     X01  C~3qUB      
2020 01  22.20299  08 44 23.38   -08 13 09.3   20.8G 17YG5     X01  C~3qUB      
2020 01  22.28009  08 44 22.01   -08 13 04.5   20.8G 17YG5     X01  C~3qUB      
2020 01  29.39349  08 42 17.656  -08 04 00.27  21.2w 17YG5     F52  C~3d0B      
2020 01  29.40319  08 42 17.479  -08 03 59.51  21.2w 17YG5     F52  C~3d0B      
2020 01  29.41297  08 42 17.312  -08 03 58.56  21.2w 17YG5     F52  C~3d0B      
2020 01  29.42273  08 42 17.123  -08 03 57.49  21.3w 17YG5     F52  C~3d0B      
2020 01  30.471922 08 41 58.623  -08 02 17.93  21.2G 17YG5     568  C~3k67      
2020 01  30.473794 08 41 58.587  -08 02 17.73  21.2G 17YG5     568  C~3k67      
2020 01  30.475665 08 41 58.553  -08 02 17.54  21.2G 17YG5     568  C~3k67      
2020 03  23.30881  08 31 37.793  -05 28 25.83  21.4w 17YG5     F51  C~3nUz      
2020 03  23.32056  08 31 37.773  -05 28 23.38  21.4w 17YG5     F51  C~3nUz      
2020 03  23.33232  08 31 37.745  -05 28 20.89  21.5w 17YG5     F51  C~3nUz      
2020 05  20.279357 08 44 01.688  -02 52 30.46  21.0G 17YG5     568  C~3wrI      
2020 05  20.281229 08 44 01.733  -02 52 30.31  20.8G 17YG5     568  C~3wrI      
2021 01  17.21150  10 34 22.13   -10 53 35.6   21.0G 17YG5     X01  C~4YIO      
2021 01  17.30434  10 34 21.31   -10 53 34.9   21.1G 17YG5     X01  C~4YIO      
2021 02  17.427220 10 27 36.831  -10 13 04.28  21.3w 17YG5     F52  C~4ZXp      
2021 02  17.438851 10 27 36.626  -10 13 02.25  21.3w 17YG5     F52  C~4ZXp      
2021 02  17.450479 10 27 36.417  -10 13 00.79  21.1w 17YG5     F52  C~4ZXp      
2021 02  17.462073 10 27 36.227  -10 12 59.29  21.0w 17YG5     F52  C~4ZXp      
2021 03  18.365110 10 20 12.209  -08 44 08.64  21.3w 17YG5     F51  C~4gZk      
2021 03  18.377440 10 20 12.043  -08 44 05.87  21.3w 17YG5     F51  C~4gZk      
2021 03  18.389765 10 20 11.864  -08 44 03.39  21.4w 17YG5     F51  C~4gZk      
2021 03  18.402084 10 20 11.706  -08 44 00.81  21.4w 17YG5     F51  C~4gZk      
2021 04  08.295198 10 16 50.026  -07 28 13.08  21.1w 17YG5     F51  C~4iNa      
2021 04  08.340788 10 16 49.746  -07 28 02.72  21.4w 17YG5     F51  C~4iNa      
2021 04  08.354120 10 16 49.701  -07 27 59.91  21.3w 17YG5     F51  C~4iNa      
2021 04  14.255858 10 16 23.403  -07 07 12.61  21.3w 17YG5     F51  C~4iNa      
2021 04  14.269170 10 16 23.345  -07 07 09.86  21.5w 17YG5     F51  C~4iNa      
2021 04  14.282476 10 16 23.289  -07 07 07.13  21.5w 17YG5     F51  C~4iNa      
2021 04  14.295816 10 16 23.251  -07 07 04.41  21.4w 17YG5     F51  C~4iNa      

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     0.51       0.00     0.12
     2   0.0000      0.00     0.33       0.00     0.07
     3   0.0000      0.00     0.40       0.00    -0.12
     4   0.0000      0.00     0.01       0.00     0.14
     5   0.0001      0.00    -0.02       0.00    -0.44
     6   0.0001      0.00     0.18       0.00    -0.20
     7   0.0001      0.00     0.31       0.00    -0.16
     8   0.0001      0.00    -0.17       0.00    -0.73
     9   0.0245      0.00    -0.17       0.00    -0.10
    10   0.0246      0.00     0.00       0.00     0.03
    11   0.0246      0.00    -0.19       0.00     0.17
    12   0.0295      0.00    -0.06       0.00    -0.13
    13   0.0296      0.00    -0.13       0.00    -0.11
    14   0.0296      0.00    -0.34       0.00     0.12
    15   0.0301      0.00    -0.05       0.00     0.25
    16   0.0302      0.00     0.06       0.00     0.15
    17   0.0302      0.00    -0.04       0.00     0.07
    18   0.0302      0.00     0.06       0.00     0.16
    19   0.0328      0.00    -0.20       0.00     0.12
    20   0.0329      0.00    -0.21       0.00     0.13
    21   1.1736      0.00    -0.04       0.00    -0.01
    22   1.1738      0.00    -0.10       0.00     0.19
    23   1.1847      0.00    -0.03       0.00     0.07
    24   1.1848      0.00    -0.05       0.00    -0.23
    25   1.3052      0.00     0.10       0.00     0.00
    26   1.3054      0.00    -0.30       0.00     0.12
    27   1.9552      0.00     0.02       0.00     0.07
    28   1.9552      0.00     0.02       0.00     0.04
    29   1.9552      0.00     0.02       0.00     0.05
    30   2.0942      0.00    -0.30       0.00     0.23
    31   2.0943      0.00    -0.08       0.00    -0.04
    32   2.1046      0.00     0.05       0.00     0.04
    33   2.1048      0.00     0.13       0.00    -0.01
    34   2.1050      0.00     0.08       0.00     0.13
    35   2.1245      0.00    -0.01       0.00     0.08
    36   2.1245      0.00    -0.03       0.00    -0.05
    37   2.1246      0.00     0.13       0.00    -0.01
    38   2.1246      0.00    -0.05       0.00     0.16
    39   2.1275      0.00     0.08       0.00     0.03
    40   2.1275      0.00     0.05       0.00     0.05
    41   2.1275      0.00     0.05       0.00     0.05
    42   2.2721      0.00     0.12       0.00     0.02
    43   2.2722      0.00     0.18       0.00     0.00
    44   2.2722      0.00     0.11       0.00     0.03
    45   2.4308      0.00     0.08       0.00     0.01
    46   2.4309      0.00     0.04       0.00    -0.00
    47   3.0932      0.00    -0.05       0.00     0.01
    48   3.0935      0.00    -0.18       0.00    -0.14
    49   3.1787      0.00     0.36       0.00    -0.18
    50   3.1787      0.00     0.17       0.00     0.20
    51   3.1788      0.00    -0.08       0.00     0.00
    52   3.1788      0.00    -0.05       0.00    -0.15
    53   3.2579      0.00     0.04       0.00    -0.00
    54   3.2579      0.00     0.06       0.00     0.13
    55   3.2580      0.00    -0.12       0.00    -0.02
    56   3.2580      0.00     0.02       0.00    -0.08
    57   3.3152      0.00    -0.30       0.00    -0.51
    58   3.3153      0.00    -0.24       0.00     0.07
    59   3.3154      0.00     0.33       0.00     0.01
    60   3.3315      0.00     0.12       0.00     0.01
    61   3.3316      0.00    -0.02       0.00     0.00
    62   3.3316      0.00    -0.13       0.00    -0.03
    63   3.3316      0.00     0.03       0.00    -0.07

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.

17YG5    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        69.689    69.686    69.691
ecceobj         0.893     0.893     0.893
incobj         23.605    23.605    23.605
qmin            7.279     7.129     7.058
qmax          155.986   168.525   157.748
amean          74.306    67.085    57.446
amin           66.069    47.930    38.940
amax           81.739    88.026    82.625
emean           0.898     0.886     0.867
emin            0.888     0.843     0.813
emax            0.908     0.918     0.909
imean          23.939    24.059    23.846
imin           23.616    22.845    23.008
imax           24.183    24.858    24.506
excite_mean     0.986     0.975     0.956
fracstop        0.003     0.012     0.009
cjmean          1.674     1.716     1.788

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       299.8     304.9     303.6
kozaiamp          3.4       9.1       8.3