Orbit Fit and Astrometric record for 17DN162

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: 17DN162   
# Created Tue Apr  1 01:11:04 2025
# Orbit generated from Bernstein formalism
# Fitting     22 observations of     22
# Arc:   3.00y
# First observation: 2016/04/02
#  Last observation: 2019/04/03
Preliminary a, adot, b, bdot, g, gdot:
  -0.000012   0.020423  -0.000004   0.001161   0.021756   0.000000
# Chi-squared of fit:     7.52 DOF:     38 RMS:  0.10
# Min/Max residuals:    -0.28    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.387037E-05  2.047605E-02  1.230930E-06  1.163696E-03  2.206864E-02  1.399113E-03
# Covariance matrix:
  2.0524E-13 -6.2551E-13  1.1563E-14 -2.9945E-14  6.3651E-14 -9.0709E-12
 -6.2551E-13  4.3448E-12 -9.3510E-14  2.2622E-13 -9.2106E-13  6.8407E-11
  1.1563E-14 -9.3510E-14  1.2043E-13 -7.6180E-14  2.2813E-14 -1.5007E-12
 -2.9945E-14  2.2622E-13 -7.6180E-14  1.1191E-13 -4.7500E-14  3.6493E-12
  6.3651E-14 -9.2106E-13  2.2813E-14 -4.7500E-14  4.2061E-13 -1.4303E-11
 -9.0709E-12  6.8407E-11 -1.5007E-12  3.6493E-12 -1.4303E-11  1.1037E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.438416 -174.297455   -0.123291    0.059389   -0.986176  2457480.929068
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           67.71770 +/-     0.073
Argument of Peri:      330.25983 +/-     0.136
Long of Asc Node:      139.81956 +/-     0.008
Inclination:             4.66972 +/-     0.001
Eccentricity:         0.07445092 +/-    0.0017
Semi-Major Axis:     47.40762593 +/-    0.0251
Time of Perihelion: 2435053.5402 +/-      16.5
Perihelion:          43.87808444 +/-    0.0824
Aphelion:            50.93716742 +/-    0.0836
Period (y)              326.4228 +/-      0.26
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -45.98227824 +/-    0.0013
Ecliptic Y           -4.71790949 +/-    0.0001
Ecliptic Z            2.71776970 +/-    0.0001
Ecliptic XDOT         0.00008873 +/-    0.0000
Ecliptic YDOT        -0.00255104 +/-    0.0000
Ecliptic ZDOT         0.00015453 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.30350801 +/-    0.0013
Geocenter to KBO     45.31316571 +/-    0.0013
# Hcoef:  7.90

The following table shows the complete astrometric record for 17DN162. 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 (17DN162) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.428279 12 26 23.09   +00 53 32.3         17DN162   T09  C~81Bu      
2016 04  02.444565 12 26 23.02   +00 53 32.8         17DN162   T09  C~81Bu      
2016 04  04.37012  12 26 15.23   +00 54 23.3   24.7g 17DN162   T09  C~89UX      
2016 04  04.37647  12 26 15.20   +00 54 23.6   25.0g 17DN162   T09  C~89UX      
2016 04  04.41508  12 26 15.04   +00 54 24.6   25.4g 17DN162   T09  C~89UX      
2016 04  04.45424  12 26 14.88   +00 54 25.6   24.9g 17DN162   T09  C~89UX      
2016 04  04.52167  12 26 14.60   +00 54 27.5   24.8g 17DN162   T09  C~89UX      
2016 06  05.320050 12 23 18.14   +01 11 07.7         17DN162   T09  C~81Bu      
2016 06  05.345518 12 23 18.11   +01 11 07.8         17DN162   T09  C~81Bu      
2017 01  23.630400 12 34 25.58   +00 02 24.6         17DN162   T09  C~81Bu      
2017 01  30.62613  12 34 15.10   +00 04 08.3   24.2z 17DN162   T09  C~7zpm      
2017 01  30.64832  12 34 15.05   +00 04 08.5   24.0z 17DN162   T09  C~7zpm      
2017 01  30.65099  12 34 15.04   +00 04 08.5   23.6z 17DN162   T09  C~7zpm      
2017 02  02.61286  12 34 09.51   +00 04 59.0   24.7i 17DN162   T09  C~7zpm      
2017 02  02.63046  12 34 09.47   +00 04 59.2   24.1i 17DN162   T09  C~7zpm      
2017 02  02.63889  12 34 09.45   +00 04 59.5   24.2i 17DN162   T09  C~7zpm      
2017 02  02.65005  12 34 09.43   +00 04 59.5   24.1i 17DN162   T09  C~7zpm      
2017 02  23.57406  12 33 14.11   +00 12 25.0   25.1r 17DN162   T09  C~7zpm      
2017 02  23.60801  12 33 14.00   +00 12 26.0   24.7r 17DN162   T09  C~7zpm      
2017 02  23.65038  12 33 13.83   +00 12 26.9   25.3r 17DN162   T09  C~7zpm      
2019 04  03.448087 12 39 35.08   -00 18 49.7         17DN162   T09  C~81Bu      
2019 04  03.472242 12 39 34.98   -00 18 49.0         17DN162   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     0.17       0.00    -0.08
     2   0.0000     -1.16     0.10       0.04    -0.03
     3   0.0053   -128.44     0.04       0.17    -0.07
     4   0.0053   -128.98    -0.07       0.27     0.04
     5   0.0054   -131.58    -0.08       0.23     0.02
     6   0.0055   -134.18    -0.06       0.20     0.01
     7   0.0057   -138.78    -0.16       0.29     0.12
     8   0.1749  -2965.21     0.05    -128.50    -0.03
     9   0.1750  -2965.67     0.01    -128.59    -0.01
    10   0.8110   7864.03     0.08      49.21     0.02
    11   0.8301   7678.35     0.12      82.18     0.08
    12   0.8302   7677.58     0.05      82.07    -0.12
    13   0.8302   7677.45     0.00      82.01    -0.19
    14   0.8383   7581.15    -0.01      95.53     0.02
    15   0.8383   7580.51    -0.02      95.47    -0.11
    16   0.8384   7580.12    -0.12      95.63     0.02
    17   0.8384   7579.84    -0.00      95.51    -0.15
    18   0.8957   6640.34     0.11     175.91     0.15
    19   0.8958   6638.42     0.08     176.17     0.32
    20   0.8959   6635.72    -0.28     175.99     0.02
    21   3.0007  12643.56     0.01     719.27    -0.04
    22   3.0008  12641.90    -0.01     719.32     0.02

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.

17DN162    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.905    46.984    46.828
ecceobj         0.073     0.078     0.069
incobj          4.682     4.682     4.682
qmin           42.771    42.596    42.981
qmax           51.796    52.166    51.423
amean          47.139    47.219    47.061
amin           46.740    46.824    46.681
amax           47.552    47.634    47.469
emean           0.076     0.081     0.072
emin            0.064     0.069     0.059
emax            0.089     0.095     0.084
imean           3.620     3.615     3.624
imin            3.301     3.292     3.311
imax            3.927     3.922     3.931
excite_mean     0.099     0.103     0.096
fracstop        1.000     1.000     1.000
cjmean          3.129     3.129     3.129

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       175.6     175.5     175.9
kozaiamp        180.0     180.0     180.0