Orbit Fit and Astrometric record for 17DB170

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: 17DB170   
# Created Tue Apr  1 01:11:05 2025
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000087   0.027113  -0.000002  -0.000093   0.025332   0.000000
# Chi-squared of fit:     2.59 DOF:     20 RMS:  0.08
# Min/Max residuals:    -0.26    0.15
# Exact a, adot, b, bdot, g, gdot:
  1.671452E-05  2.698995E-02  2.723674E-07 -9.483389E-05  2.555062E-02 -6.077600E-04
# Covariance matrix:
  7.3311E-13 -9.6295E-13 -2.2907E-15  2.9765E-15 -2.9869E-13 -8.8151E-12
 -9.6295E-13  2.6573E-12 -5.9814E-15 -6.3836E-15 -3.4295E-13  2.8872E-11
 -2.2907E-15 -5.9814E-15  2.8727E-13 -1.3849E-13  1.0475E-14 -8.0328E-14
  2.9765E-15 -6.3836E-15 -1.3849E-13  1.1026E-13 -1.2228E-15 -6.9665E-14
 -2.9869E-13 -3.4295E-13  1.0475E-14 -1.2228E-15  9.8345E-13 -5.1015E-12
 -8.8151E-12  2.8872E-11 -8.0328E-14 -6.9665E-14 -5.1015E-12  3.2886E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.291604 -172.994286   -0.135506    0.073984   -0.984143  2457482.957870
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          353.50781 +/-     0.234
Argument of Peri:      101.68355 +/-     0.316
Long of Asc Node:       94.21204 +/-     0.010
Inclination:             4.19145 +/-     0.000
Eccentricity:         0.14145337 +/-    0.0001
Semi-Major Axis:     46.67097776 +/-    0.0114
Time of Perihelion: 2459580.6832 +/-      75.8
Perihelion:          40.06921080 +/-    0.0115
Aphelion:            53.27274473 +/-    0.0143
Period (y)              318.8442 +/-      0.12
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.70358278 +/-    0.0015
Ecliptic Y           -5.01778742 +/-    0.0002
Ecliptic Z            2.92884108 +/-    0.0001
Ecliptic XDOT         0.00041657 +/-    0.0000
Ecliptic YDOT        -0.00286964 +/-    0.0000
Ecliptic ZDOT        -0.00001500 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.12643501 +/-    0.0015
Geocenter to KBO     39.13799352 +/-    0.0015
# Hcoef:  8.67

The following table shows the complete astrometric record for 17DB170. 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 (17DB170) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.457081 12 32 30.73   +01 09 42.8         17DB170   T09  C~86v4      
2016 04  04.491423 12 32 30.57   +01 09 43.8         17DB170   T09  C~86v4      
2017 02  21.56614  12 41 12.01   +00 12 07.7   24.3z 17DB170   T09  C~86v4      
2017 02  21.59574  12 41 11.90   +00 12 08.5   24.3z 17DB170   T09  C~86v4      
2017 02  21.61448  12 41 11.85   +00 12 09.0   24.2z 17DB170   T09  C~86v4      
2017 02  23.54142  12 41 05.15   +00 13 00.1   25.3r 17DB170   T09  C~86v4      
2017 02  23.61010  12 41 04.89   +00 13 01.9   24.6r 17DB170   T09  C~86v4      
2017 02  23.62285  12 41 04.83   +00 13 02.4   24.5r 17DB170   T09  C~86v4      
2017 02  23.65247  12 41 04.74   +00 13 03.1   25.0r 17DB170   T09  C~86v4      
2017 04  27.392208 12 36 32.85   +00 42 27.7         17DB170   T09  C~86v4      
2019 04  03.453429 12 49 43.83   -00 42 24.1         17DB170   T09  C~86v4      
2019 04  03.477581 12 49 43.72   -00 42 23.5         17DB170   T09  C~86v4      
2019 04  06.460461 12 49 29.88   -00 40 56.8         17DB170   T09  C~86v4      

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    -0.00       0.00    -0.07
     2   0.0001     -2.60     0.00      -0.03    -0.05
     3   0.8846   8552.43     0.04     -84.51    -0.01
     4   0.8847   8550.60    -0.06     -84.43    -0.02
     5   0.8848   8549.71     0.15     -84.26     0.08
     6   0.8900   8437.01     0.13     -77.05     0.07
     7   0.8902   8432.70    -0.01     -76.94    -0.03
     8   0.8903   8431.68    -0.26     -76.83     0.03
     9   0.8903   8430.16     0.01     -76.72     0.05
    10   1.0621   3982.37    -0.00     -67.64     0.01
    11   2.9952  16930.61    -0.09     -55.28    -0.01
    12   2.9953  16928.84     0.01     -55.38    -0.08
    13   3.0034  16702.40     0.09     -57.77     0.04

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.

17DB170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.103    46.143    46.064
ecceobj         0.130     0.131     0.130
incobj          4.190     4.190     4.190
qmin           39.496    39.518    39.479
qmax           53.597    53.662    53.519
amean          46.355    46.395    46.316
amin           45.963    46.008    45.936
amax           46.791    46.844    46.760
emean           0.131     0.132     0.131
emin            0.118     0.119     0.117
emax            0.145     0.146     0.145
imean           2.461     2.465     2.457
imin            1.996     1.998     1.992
imax            2.969     2.962     2.973
excite_mean     0.138     0.139     0.137
fracstop        1.000     1.000     1.000
cjmean          3.107     3.107     3.107

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       189.1     188.5     189.6
kozaiamp        179.9     180.0     180.0