Orbit Fit and Astrometric record for 17DP171

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: 17DP171   
# Created Tue Apr  1 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting     20 observations of     21
# Arc:   4.19y
# First observation: 2015/01/25
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000100   0.020935  -0.000006   0.001017   0.022435   0.000000
# Chi-squared of fit:     9.58 DOF:     34 RMS:  0.12
# Min/Max residuals:    -0.32    0.36
# Exact a, adot, b, bdot, g, gdot:
  1.464327E-05  2.067262E-02  1.041611E-06  1.000855E-03  2.225645E-02  1.835781E-04
# Covariance matrix:
  4.4601E-13 -3.4000E-13  1.1354E-14 -1.5976E-14 -8.4045E-14 -3.2885E-12
 -3.4000E-13  5.3439E-13 -2.5563E-14  2.6447E-14  4.3904E-13  6.2021E-12
  1.1354E-14 -2.5563E-14  3.0613E-13 -1.2216E-13 -2.5399E-14 -3.3069E-13
 -1.5976E-14  2.6447E-14 -1.2216E-13  6.4533E-14  1.3390E-14  3.8573E-13
 -8.4045E-14  4.3904E-13 -2.5399E-14  1.3390E-14  7.7427E-13  4.5357E-12
 -3.2885E-12  6.2021E-12 -3.3069E-13  3.8573E-13  4.5357E-12  8.5736E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    5.727911 -171.103925    0.882242    0.043243   -0.429627  2457048.108763
# Heliocentric elements and errors
Epoch:              2457040.5000  =  2015/01/18
Mean Anomaly:          255.85939 +/-     0.830
Argument of Peri:      168.37543 +/-     0.821
Long of Asc Node:      124.66927 +/-     0.006
Inclination:             6.35461 +/-     0.000
Eccentricity:         0.00912088 +/-    0.0004
Semi-Major Axis:     45.26759393 +/-    0.0054
Time of Perihelion: 2489221.3239 +/-     256.5
Perihelion:          44.85471373 +/-    0.0203
Aphelion:            45.68047413 +/-    0.0204
Period (y)              304.5715 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.73452580 +/-    0.0017
Ecliptic Y           -6.10859749 +/-    0.0003
Ecliptic Z            4.48433143 +/-    0.0002
Ecliptic XDOT         0.00037938 +/-    0.0000
Ecliptic YDOT        -0.00251941 +/-    0.0000
Ecliptic ZDOT         0.00012485 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.37181934 +/-    0.0017
Geocenter to KBO     44.93079461 +/-    0.0018
# Hcoef:  8.60

The following table shows the complete astrometric record for 17DP171. 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 (17DP171) followed by the observatory code and reference code for the source of the astrometry.

2015 01  25.607985 12 41 42.12   +01 44 23.7         17DP171   T14  C~89Ua      
2015 01  25.626431 12 41 42.10   +01 44 24.1         17DP171   T14  C~89Ua      
2015 01  25.635652 12 41 42.08   +01 44 24.1         17DP171   T14  C~89Ua      
2016 04  04.493549 12 42 29.76   +01 48 31.1         17DP171   T09  C~89Ua      
2016 04  04.495674 12 42 29.74   +01 48 31.1         17DP171   T09  C~89Ua      
2017 02  21.51236  12 49 40.78   +01 04 03.4   24.9z 17DP171   T09  C~89Ua      
2017 02  21.53383  12 49 40.71   +01 04 04.0   25.2z 17DP171   T09  C~89Ua      
2017 02  21.55541  12 49 40.66   +01 04 04.9   24.8z 17DP171   T09  C~89Ua      
2017 02  21.57695  12 49 40.59   +01 04 05.2   24.4z 17DP171   T09  C~89Ua      
2017 02  21.61983  12 49 40.46   +01 04 06.0   24.5z 17DP171   T09  C~89Ua      
2017 02  23.56125  12 49 34.58   +01 04 55.1   25.4r 17DP171   T09  C~89Ua      
2017 02  23.59306  12 49 34.46   +01 04 55.8   25.6r 17DP171   T09  C~89Ua      
2017 02  23.62494  12 49 34.40   +01 04 57.1   25.4r 17DP171   T09  C~89Ua      
2017 02  23.65665  12 49 34.28   +01 04 57.6   25.3r 17DP171   T09  C~89Ua      
2017 03  06.641649 12 48 57.27   +01 09 50.5         17DP171   T09  C~89Ua      
2017 04  02.334134 12 47 10.93   +01 22 14.1         17DP171   T09  C~89Ua      
2017 04  02.492036 12 47 10.26   +01 22 18.3         17DP171   T09  C~89Ua      
2017 04  27.395922 12 45 30.20   +01 32 19.0         17DP171   T09  C~89Ua      
2017 04  27.420264 12 45 30.11   +01 32 19.6         17DP171   T09  C~89Ua      
2019 04  06.383910 12 55 58.17   +00 33 20.9         17DP171   T09  C~89Ua      
2019 04  06.531186 12 55 57.54   +00 33 25.0         17DP171   T09  C~89Ua      

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     0.01       0.00    -0.07
     2   0.0001     -0.43     0.03       0.25     0.05
     3   0.0001     -0.71    -0.03       0.13    -0.14
     4   1.1907    559.44     0.07     508.33     0.08
     5   1.1907    559.16    -0.06     508.22    -0.04
     6   2.0750   7554.36    -0.13     600.45     0.06
     7   2.0751   7553.16    -0.22     600.59     0.09
     8   2.0751   7552.11 (  -0.14)    601.12 (   0.51)
     9   2.0752   7551.03    -0.11     600.98     0.26
    10   2.0753   7548.92     0.01     600.95     0.01
    11   2.0806   7448.39     0.10     611.34    -0.10
    12   2.0807   7446.46    -0.12     611.27    -0.32
    13   2.0808   7445.12     0.25     612.11     0.36
    14   2.0809   7443.26     0.10     611.86    -0.04
    15   2.1110   6816.97     0.10     662.43    -0.02
    16   2.1841   5056.81    -0.01     717.80     0.01
    17   2.1845   5045.92     0.03     717.71    -0.05
    18   2.2527   3429.48    -0.02     679.13    -0.05
    19   2.2527   3428.00    -0.03     679.15     0.06
    20   4.1938  13498.58     0.07    1139.53    -0.15
    21   4.1942  13488.24    -0.06    1139.57     0.01

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.

17DP171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.860    44.876    44.845
ecceobj         0.015     0.015     0.015
incobj          6.362     6.363     6.362
qmin           43.767    43.787    43.743
qmax           46.566    46.587    46.565
amean          45.100    45.116    45.086
amin           44.756    44.764    44.738
amax           45.454    45.471    45.435
emean           0.013     0.013     0.014
emin            0.000     0.001     0.001
emax            0.025     0.025     0.025
imean           4.990     4.991     4.991
imin            4.573     4.577     4.573
imax            5.434     5.430     5.432
excite_mean     0.088     0.088     0.088
fracstop        1.000     1.000     1.000
cjmean          3.106     3.106     3.105

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       181.6     181.8     181.8
kozaiamp        180.0     179.9     179.9