Orbit Fit and Astrometric record for 17DK160

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: 17DK160   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     23 observations of     23
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000168   0.031741   0.000020   0.009560   0.027539   0.000000
# Chi-squared of fit:     9.57 DOF:     40 RMS:  0.11
# Min/Max residuals:    -0.31    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.798835E-05  3.213346E-02  5.789976E-06  9.665523E-03  2.803165E-02  4.035998E-03
# Covariance matrix:
  3.4842E-13 -4.2887E-13  4.5904E-14 -1.0349E-13 -1.5494E-13 -3.2333E-12
 -4.2887E-13  9.4310E-13 -1.2040E-13  2.6454E-13  3.9018E-14  8.2594E-12
  4.5904E-14 -1.2040E-13  1.8362E-13 -1.0974E-13  2.2180E-15 -1.1207E-12
 -1.0349E-13  2.6454E-13 -1.0974E-13  1.3195E-13  4.3728E-15  2.4585E-12
 -1.5494E-13  3.9018E-14  2.2180E-15  4.3728E-15  4.9271E-13  1.4449E-13
 -3.2333E-12  8.2594E-12 -1.1207E-12  2.4585E-12  1.4449E-13  7.6754E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.663941 -170.648274   -0.095093    0.080760   -0.988337  2457482.963558
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           11.18462 +/-     0.018
Argument of Peri:      349.48458 +/-     0.044
Long of Asc Node:      174.74227 +/-     0.000
Inclination:            17.30080 +/-     0.000
Eccentricity:         0.37331417 +/-    0.0002
Semi-Major Axis:     56.90584073 +/-    0.0174
Time of Perihelion: 2452609.1162 +/-       7.4
Perihelion:          35.66208391 +/-    0.0175
Aphelion:            78.14959755 +/-    0.0275
Period (y)              429.2828 +/-      0.20
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.04992352 +/-    0.0009
Ecliptic Y           -6.03528791 +/-    0.0002
Ecliptic Z            2.90093302 +/-    0.0001
Ecliptic XDOT         0.00019818 +/-    0.0000
Ecliptic YDOT        -0.00315511 +/-    0.0000
Ecliptic ZDOT         0.00097297 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.66656649 +/-    0.0009
Geocenter to KBO     35.67395756 +/-    0.0009
# Hcoef:  7.99

The following table shows the complete astrometric record for 17DK160. 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 (17DK160) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.462769 12 41 41.96   +00 34 59.6         17DK160   T09  C~81Bu      
2016 04  04.557901 12 41 41.49   +00 35 03.1         17DK160   T09  C~81Bu      
2016 04  06.484435 12 41 32.19   +00 36 12.4         17DK160   T09  C~81Bu      
2016 04  06.605250 12 41 31.60   +00 36 16.7         17DK160   T09  C~81Bu      
2017 02  21.50220  12 52 22.64   -00 03 25.8   24.1z 17DK160   T09  C~7xTz      
2017 02  21.52572  12 52 22.56   -00 03 24.9   23.5z 17DK160   T09  C~7xTz      
2017 02  21.61177  12 52 22.26   -00 03 22.1   23.5z 17DK160   T09  C~7xTz      
2017 02  23.54701  12 52 15.73   -00 02 17.9   24.1r 17DK160   T09  C~7xU0      
2017 02  23.58243  12 52 15.60   -00 02 16.8   24.1r 17DK160   T09  C~7xU0      
2017 02  23.64611  12 52 15.39   -00 02 14.4   23.8r 17DK160   T09  C~7xU0      
2017 02  23.65665  12 52 15.35   -00 02 14.1   24.0r 17DK160   T09  C~7xU0      
2017 03  03.281289 12 51 47.126  +00 02 10.14  23.8r 17DK160   W84  C~8HKV      
2017 03  25.267116 12 50 09.907  +00 15 43.42  23.4V 17DK160   W84  C~8HKV      
2017 03  25.273819 12 50 09.862  +00 15 43.60  23.5V 17DK160   W84  C~8HKV      
2017 04  27.399658 12 47 34.34   +00 34 36.4         17DK160   T09  C~81Bu      
2017 04  27.411358 12 47 34.28   +00 34 36.8         17DK160   T09  C~81Bu      
2019 02  07.340762 13 07 53.086  -00 35 30.30  22.6z 17DK160   W84  C~8HKV      
2019 04  06.37036  13 04 16.89   -00 02 31.2   23.5i 17DK160   T09  C~81Bu      
2019 04  06.37374  13 04 16.86   -00 02 30.9   23.5i 17DK160   T09  C~81Bu      
2019 04  06.42173  13 04 16.64   -00 02 29.4   23.1i 17DK160   T09  C~81Bu      
2019 04  06.45208  13 04 16.48   -00 02 28.5   22.8i 17DK160   T09  C~81Bu      
2019 04  06.47931  13 04 16.36   -00 02 27.2   22.9i 17DK160   T09  C~81Bu      
2019 04  06.53387  13 04 16.06   -00 02 25.3   23.3i 17DK160   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     0.03       0.00    -0.07
     2   0.0003     -7.86    -0.02       0.45    -0.03
     3   0.0055   -163.36     0.01       9.44    -0.05
     4   0.0059   -173.18     0.02       9.92    -0.06
     5   0.8844   9750.93     0.11    1654.39     0.00
     6   0.8845   9749.47     0.05    1654.75     0.12
     7   0.8847   9744.22    -0.04    1655.56     0.05
     8   0.8900   9628.67    -0.02    1676.14    -0.02
     9   0.8901   9626.44    -0.05    1676.38    -0.13
    10   0.8903   9622.59     0.05    1677.35     0.20
    11   0.8903   9621.92     0.04    1677.39     0.13
    12   0.9112   9127.78     0.06    1754.13     0.10
    13   0.9714   7464.53    -0.16    1929.18     0.04
    14   0.9714   7463.84    -0.30    1929.08    -0.10
    15   1.0621   4871.17     0.18    2054.33    -0.04
    16   1.0621   4870.18     0.04    2054.35    -0.03
    17   2.8443  23439.84     0.05    5388.34    -0.15
    18   3.0032  19638.53     0.10    5932.83     0.03
    19   3.0032  19637.99    -0.16    5932.93     0.12
    20   3.0033  19634.34     0.14    5933.01     0.02
    21   3.0034  19631.75     0.06    5932.89    -0.22
    22   3.0035  19629.57     0.12    5933.38     0.17
    23   3.0036  19624.63    -0.31    5933.35    -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.

17DK160    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        56.045    56.103    55.988
ecceobj         0.364     0.365     0.363
incobj         17.370    17.370    17.370
qmin           34.481    34.344    33.688
qmax           79.061    79.276    80.197
amean          56.202    56.182    56.290
amin           55.492    55.439    55.386
amax           57.130    57.103    57.341
emean           0.368     0.371     0.378
emin            0.352     0.353     0.353
emax            0.385     0.389     0.402
imean          16.384    16.259    15.873
imin           15.620    15.491    14.376
imax           17.148    17.077    17.061
excite_mean     0.464     0.465     0.467
fracstop        1.000     1.000     1.000
cjmean          2.972     2.971     2.969

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       164.8     162.7     159.8
kozaiamp        180.0     180.0     180.0