Orbit Fit and Astrometric record for 17DF156

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: 17DF156   
# Created Thu Oct 31 01:10:33 2024
# Orbit generated from Bernstein formalism
# Fitting     46 observations of     47
# Arc:   3.00y
# First observation: 2015/01/17
#  Last observation: 2018/01/17
Preliminary a, adot, b, bdot, g, gdot:
   0.000213   0.024179  -0.000028  -0.001729   0.024054   0.000000
# Chi-squared of fit:    22.78 DOF:     86 RMS:  0.12
# Min/Max residuals:    -0.36    0.39
# Exact a, adot, b, bdot, g, gdot:
  1.527797E-05  2.458464E-02 -9.641373E-07 -1.756775E-03  2.448670E-02  5.999905E-03
# Covariance matrix:
  6.4887E-13 -5.9769E-13 -1.9364E-14  2.9833E-14 -3.1206E-13 -5.3352E-12
 -5.9769E-13  1.0803E-12  5.1234E-14 -7.2754E-14  9.9597E-13  1.2937E-11
 -1.9364E-14  5.1234E-14  4.3952E-13 -1.9766E-13  5.4909E-14  6.6979E-13
  2.9833E-14 -7.2754E-14 -1.9766E-13  9.8346E-14 -7.3231E-14 -9.5333E-13
 -3.1206E-13  9.9597E-13  5.4909E-14 -7.3231E-14  1.1981E-12  1.2960E-11
 -5.3352E-12  1.2937E-11  6.6979E-13 -9.5333E-13  1.2960E-11  1.6954E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.339015  150.139374    0.543049   -0.132570   -0.807169  2457039.860010
# Heliocentric elements and errors
Epoch:              2457030.5000  =  2015/01/08
Mean Anomaly:           45.42888 +/-     0.018
Argument of Peri:      173.49610 +/-     0.046
Long of Asc Node:      264.29111 +/-     0.004
Inclination:            10.07547 +/-     0.000
Eccentricity:         0.26051576 +/-    0.0005
Semi-Major Axis:     48.29462446 +/-    0.0116
Time of Perihelion: 2441561.0049 +/-       2.2
Perihelion:          35.71311375 +/-    0.0262
Aphelion:            60.87613517 +/-    0.0288
Period (y)              335.6266 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -35.38951951 +/-    0.0016
Ecliptic Y           20.94209102 +/-    0.0009
Ecliptic Z           -6.62716917 +/-    0.0003
Ecliptic XDOT        -0.00191891 +/-    0.0000
Ecliptic YDOT        -0.00207550 +/-    0.0000
Ecliptic ZDOT        -0.00030259 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.65223450 +/-    0.0014
Geocenter to KBO     40.83849042 +/-    0.0018
# Hcoef:  9.05

The following table shows the complete astrometric record for 17DF156. 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 (17DF156) followed by the observatory code and reference code for the source of the astrometry.

2015 01  17.359232 09 55 46.80   +02 40 03.0         17DF156   T09  C~81Bt      
2015 01  17.368399 09 55 46.75   +02 40 03.1         17DF156   T09  C~81Bt      
2016 02  09.313312 09 59 17.37   +02 11 40.7         17DF156   T09  C~81Bt      
2016 02  09.350821 09 59 17.19   +02 11 41.5         17DF156   T09  C~81Bt      
2017 01  21.44099  10 05 41.31   +01 31 47.8   25.3z 17DF156   T09  C~83F2      
2017 01  21.48580  10 05 41.12   +01 31 48.3   25.0z 17DF156   T09  C~83F2      
2017 01  21.51187  10 05 41.01   +01 31 48.7   25.0z 17DF156   T09  C~83F2      
2017 01  21.56003  10 05 40.82   +01 31 49.4   25.6z 17DF156   T09  C~83F2      
2017 01  23.36273  10 05 33.58   +01 32 14.4   25.5r 17DF156   T09  C~7gv4      
2017 01  23.39642  10 05 33.43   +01 32 15.0   25.3r 17DF156   T09  C~7gv4      
2017 01  23.52068  10 05 32.93   +01 32 17.1   25.3i 17DF156   T09  C~7gv4      
2017 01  23.56169  10 05 32.76   +01 32 17.4   25.2i 17DF156   T09  C~7gv4      
2017 02  21.32753  10 03 24.46   +01 42 02.2   24.6z 17DF156   T09  C~7gv4      
2017 02  21.35310  10 03 24.36   +01 42 02.6   24.1z 17DF156   T09  C~7gv4      
2017 02  21.37870  10 03 24.23   +01 42 03.4   24.5z 17DF156   T09  C~7gv4      
2017 02  21.39002  10 03 24.17   +01 42 03.9   24.4z 17DF156   T09  C~7gv4      
2017 02  23.45915  10 03 14.67   +01 42 56.4   26.4r 17DF156   T09  C~7gv4      
2017 02  23.46966  10 03 14.61   +01 42 56.4   25.6r 17DF156   T09  C~7gv4      
2017 02  23.47280  10 03 14.58   +01 42 56.4   25.6r 17DF156   T09  C~7gv4      
2017 03  04.44514  10 02 34.00   +01 46 51.9   25.0i 17DF156   T09  C~7xTz      
2017 03  04.45958  10 02 33.93   +01 46 52.2   25.0i 17DF156   T09  C~7xTz      
2017 03  04.50300  10 02 33.73   +01 46 53.4   25.5i 17DF156   T09  C~7xTz      
2017 03  04.50666  10 02 33.72   +01 46 53.5   25.2i 17DF156   T09  C~7xTz      
2017 03  04.51049  10 02 33.70   +01 46 53.7   25.2i 17DF156   T09  C~7xTz      
2017 03  06.49634  10 02 24.97   +01 47 47.2   25.3r 17DF156   T09  C~7gv4      
2017 03  06.50700  10 02 24.92   +01 47 47.5   25.0r 17DF156   T09  C~7gv4      
2017 03  06.52077  10 02 24.86   +01 47 47.8   25.6r 17DF156   T09  C~7gv4      
2017 03  06.52393  10 02 24.85   +01 47 47.8   25.4r 17DF156   T09  C~7gv4      
2017 03  06.53779  10 02 24.78   +01 47 48.2   25.2r 17DF156   T09  C~7gv4      
2017 03  07.44431  10 02 20.85   +01 48 12.7   23.9y 17DF156   T09  C~7gv4      
2017 03  07.44816  10 02 20.83   +01 48 13.0   23.8y 17DF156   T09  C~7gv4      
2017 03  07.46245  10 02 20.76   +01 48 13.7   24.1y 17DF156   T09  C~7gv4      
2017 03  07.48499  10 02 20.67   +01 48 14.0   24.1y 17DF156   T09  C~7gv4      
2017 03  22.27563  10 01 20.67   +01 54 59.5   26.0g 17DF156   T09  C~7gv4      
2017 03  22.28630  10 01 20.63   +01 54 59.9   25.5g 17DF156   T09  C~7gv4      
2017 03  22.30327  10 01 20.57   +01 55 00.4   26.2g 17DF156   T09  C~7gv4      
2017 03  22.36160  10 01 20.35   +01 55 01.9   26.4g 17DF156   T09  C~7gv4      
2017 03  23.24138  10 01 17.13   +01 55 25.9   25.5i 17DF156   T09  C~7zpm      
2017 03  23.25932  10 01 17.04   +01 55 26.6   25.1i 17DF156   T09  C~7zpm      
2017 03  23.28109  10 01 16.96   +01 55 27.1   25.4i 17DF156   T09  C~7zpm      
2017 03  23.28492  10 01 16.94   +01 55 27.2   25.1i 17DF156   T09  C~7zpm      
2018 01  17.46122  10 10 57.88   +00 56 50.8   25.1i 17DF156   T09  C~81Bu      
2018 01  17.46460  10 10 57.86   +00 56 50.4   25.2i 17DF156   T09  C~81Bu      
2018 01  17.49135  10 10 57.79   +00 56 50.9   25.1i 17DF156   T09  C~81Bu      
2018 01  17.54803  10 10 57.57   +00 56 51.6   24.9i 17DF156   T09  C~81Bu      
2018 01  17.57490  10 10 57.45   +00 56 51.9   25.3i 17DF156   T09  C~81Bu      
2018 01  17.59901  10 10 57.36   +00 56 52.1   25.1i 17DF156   T09  C~81Bu      

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     0.12       0.00    -0.04
     2   0.0000     -0.74    -0.06      -0.16    -0.12
     3   1.0622   3549.95    -0.06    -506.63     0.03
     4   1.0623   3547.14    -0.13    -506.82    -0.01
     5   2.0125   9785.53     0.11    -757.86     0.05
     6   2.0127   9782.68     0.04    -758.38    -0.10
     7   2.0127   9780.99    -0.04    -758.57    -0.07
     8   2.0129   9778.07     0.03    -758.90     0.00
     9   2.0178   9667.33     0.10    -773.11    -0.20
    10   2.0179   9665.01    -0.10    -773.33    -0.15
    11   2.0182   9657.23     0.01    -773.96     0.21
    12   2.0184   9654.73     0.12    -774.56    -0.06
    13   2.0971   7644.01    -0.04    -892.87    -0.07
    14   2.0972   7642.47     0.32    -893.02    -0.19
    15   2.0972   7640.36     0.12    -892.94    -0.09
    16   2.0973   7639.34    -0.05    -892.78     0.08
    17   2.1029   7487.33 (   0.22)   -892.88 (   0.55)
    18   2.1030   7486.48     0.16    -893.19     0.24
    19   2.1030   7486.06    -0.03    -893.35     0.09
    20   2.1275   6832.94    -0.09    -883.18     0.14
    21   2.1276   6831.85    -0.13    -883.26     0.03
    22   2.1277   6828.62    -0.21    -883.17     0.04
    23   2.1277   6828.45    -0.12    -883.13     0.08
    24   2.1277   6828.10    -0.19    -883.05     0.15
    25   2.1332   6686.63    -0.07    -878.19     0.05
    26   2.1332   6685.82    -0.11    -878.16     0.05
    27   2.1332   6684.87    -0.07    -878.19    -0.02
    28   2.1332   6684.73     0.02    -878.25    -0.08
    29   2.1333   6683.60    -0.11    -878.23    -0.10
    30   2.1358   6619.78     0.10    -875.66    -0.14
    31   2.1358   6619.39    -0.01    -875.48     0.02
    32   2.1358   6618.16    -0.21    -875.18     0.28
    33   2.1359   6616.79     0.03    -875.37     0.04
    34   2.1764   5631.62     0.04    -806.40    -0.12
    35   2.1764   5630.92     0.01    -806.23    -0.02
    36   2.1764   5629.90     0.06    -806.07     0.04
    37   2.1766   5626.28     0.12    -805.81    -0.04
    38   2.1790   5572.65     0.39    -800.00     0.09
    39   2.1791   5571.14    -0.01    -799.81     0.17
    40   2.1791   5569.84     0.05    -799.76     0.09
    41   2.1791   5569.52    -0.03    -799.77     0.06
    42   3.0010  14984.70    -0.14   -1078.03     0.09
    43   3.0010  14984.56    -0.10   -1078.51    -0.36
    44   3.0010  14983.39     0.26   -1078.41    -0.01
    45   3.0012  14980.04     0.14   -1078.90     0.04
    46   3.0013  14978.24    -0.13   -1079.24    -0.05
    47   3.0013  14976.90    -0.10   -1079.52    -0.11

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.

17DF156    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        48.066    48.098    48.033
ecceobj         0.261     0.262     0.260
incobj         10.067    10.067    10.067
qmin           35.106    34.967    35.197
qmax           61.562    61.792    61.433
amean          47.797    47.797    47.797
amin           47.069    47.078    47.116
amax           48.600    48.671    48.606
emean           0.245     0.250     0.244
emin            0.224     0.228     0.220
emax            0.268     0.271     0.266
imean          12.102    11.766    12.120
imin           11.509    11.146    11.504
imax           12.884    12.519    13.025
excite_mean     0.323     0.323     0.322
fracstop        1.000     1.000     1.000
cjmean          3.018     3.018     3.018

libcent 0       180.0     180.0     181.6
libamp  0       160.5     162.9     158.8
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       204.6     204.8     191.9
kozaiamp        180.0     180.0     180.0