Orbit Fit and Astrometric record for 17DL171

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: 17DL171   
# Created Wed Dec 25 02:10:54 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     23 observations of     23
# Arc:  15.04y
# First observation: 2004/03/20
#  Last observation: 2019/04/06
# Chi-squared of fit:    11.27 DOF:     40 RMS:  0.12
# Min/Max residuals:    -0.30    0.34
# Exact a, adot, b, bdot, g, gdot:
  1.453442E-05  2.165530E-02  9.171923E-07  1.197353E-03  2.419017E-02  5.693276E-03
# Covariance matrix:
  7.3409E-13 -1.1070E-13  1.9810E-15 -3.1770E-15 -5.4900E-14 -2.0033E-13
 -1.1070E-13  9.9156E-14 -3.2826E-15  5.2496E-15  7.3735E-14  3.3156E-13
  1.9810E-15 -3.2826E-15  6.9945E-13 -5.3725E-14 -2.4612E-15 -1.1503E-14
 -3.1770E-15  5.2496E-15 -5.3725E-14  4.8305E-15  4.3482E-15  1.8396E-14
 -5.4900E-14  7.3735E-14 -2.4612E-15  4.3482E-15  5.3546E-13  2.5959E-13
 -2.0033E-13  3.3156E-13 -1.1503E-14  1.8396E-14  2.5959E-13  1.1619E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.186972  175.322371   -0.085882    0.072235   -0.986014  2453084.988189
# Heliocentric elements and errors
Epoch:              2453084.5000  =  2004/03/20
Mean Anomaly:           91.35249 +/-     0.029
Argument of Peri:      291.96609 +/-     0.016
Long of Asc Node:      123.30252 +/-     0.002
Inclination:             5.17417 +/-     0.000
Eccentricity:         0.26570262 +/-    0.0000
Semi-Major Axis:     39.44241773 +/-    0.0040
Time of Perihelion: 2430125.0430 +/-       8.2
Perihelion:          28.96246418 +/-    0.0033
Aphelion:            49.92237128 +/-    0.0053
Period (y)              247.7157 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -42.08760454 +/-    0.0012
Ecliptic Y            3.35892699 +/-    0.0001
Ecliptic Z            3.01828588 +/-    0.0001
Ecliptic XDOT        -0.00083395 +/-    0.0000
Ecliptic YDOT        -0.00239799 +/-    0.0000
Ecliptic ZDOT         0.00018234 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.32901795 +/-    0.0012
Geocenter to KBO     41.33899879 +/-    0.0013
# Hcoef:  8.00

The following table shows the complete astrometric record for 17DL171. 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 (17DL171) followed by the observatory code and reference code for the source of the astrometry.

2004 03  20.487446 11 49 29.92   +05 42 03.9         17DL171   T14  C~89Ua      
2004 03  20.520303 11 49 29.78   +05 42 04.9         17DL171   T14  C~89Ua      
2016 04  04.459918 12 40 55.69   +00 51 03.0         17DL171   T09  C~89Ua      
2016 04  04.46278  12 40 55.66   +00 51 03.2   25.1g 17DL171   T09  C~8COu      
2016 04  04.48277  12 40 55.60   +00 51 03.7   25.0g 17DL171   T09  C~8COu      
2016 04  04.49356  12 40 55.54   +00 51 04.0   25.4g 17DL171   T09  C~8COu      
2016 04  04.52802  12 40 55.39   +00 51 05.0   25.3g 17DL171   T09  C~8COu      
2016 04  04.557901 12 40 55.27   +00 51 05.7         17DL171   T09  C~89Ua      
2017 02  21.49884  12 47 46.36   +00 08 05.3   24.1z 17DL171   T09  C~89Ua      
2017 02  21.52305  12 47 46.30   +00 08 06.3   24.2z 17DL171   T09  C~89Ua      
2017 02  21.54460  12 47 46.21   +00 08 06.4   23.9z 17DL171   T09  C~89Ua      
2017 02  21.59841  12 47 46.05   +00 08 08.0   24.4z 17DL171   T09  C~89Ua      
2017 02  21.61716  12 47 45.98   +00 08 08.1   24.4z 17DL171   T09  C~89Ua      
2017 02  23.54421  12 47 39.91   +00 08 56.5   24.5r 17DL171   T09  C~89Ua      
2017 02  23.58033  12 47 39.80   +00 08 57.3   24.5r 17DL171   T09  C~89Ua      
2017 02  23.61428  12 47 39.69   +00 08 58.2   24.1r 17DL171   T09  C~89Ua      
2017 02  23.65456  12 47 39.56   +00 08 59.4   24.3r 17DL171   T09  C~89Ua      
2017 02  23.65665  12 47 39.56   +00 08 59.7   24.7r 17DL171   T09  C~89Ua      
2017 04  27.395922 12 43 29.38   +00 36 39.9         17DL171   T09  C~89Ua      
2017 04  27.408451 12 43 29.34   +00 36 40.1         17DL171   T09  C~89Ua      
2019 04  04.520389 12 53 10.84   -00 19 39.0         17DL171   T09  C~89Ua      
2019 04  06.449359 12 53 02.66   -00 18 47.1         17DL171   T09  C~89Ua      
2019 04  06.515104 12 53 02.39   -00 18 45.3         17DL171   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    -0.08       0.00     0.01
     2   0.0001      0.00     0.08       0.00     0.03
     3  12.0410      0.00    -0.04       0.00    -0.11
     4  12.0410      0.00    -0.30       0.00     0.02
     5  12.0411      0.00     0.10       0.00    -0.03
     6  12.0411      0.00    -0.09       0.00    -0.02
     7  12.0412      0.00    -0.10       0.00     0.05
     8  12.0413      0.00     0.04       0.00    -0.07
     9  12.9254      0.00    -0.03       0.00    -0.13
    10  12.9255      0.00     0.22       0.00     0.27
    11  12.9256      0.00    -0.10       0.00    -0.16
    12  12.9257      0.00     0.06       0.00     0.11
    13  12.9257      0.00    -0.10       0.00    -0.26
    14  12.9310      0.00    -0.15       0.00    -0.02
    15  12.9311      0.00    -0.02       0.00    -0.14
    16  12.9312      0.00     0.00       0.00    -0.09
    17  12.9313      0.00     0.03       0.00     0.09
    18  12.9313      0.00     0.13       0.00     0.34
    19  13.1031      0.00     0.06       0.00     0.05
    20  13.1031      0.00     0.19       0.00    -0.02
    21  15.0391      0.00    -0.05       0.00     0.10
    22  15.0444      0.00    -0.11       0.00     0.00
    23  15.0446      0.00     0.09       0.00     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.

17DL171    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.106    39.106    39.106
ecceobj         0.270     0.270     0.270
incobj          5.182     5.182     5.182
qmin           28.378    28.419    28.383
qmax           51.295    51.318    51.289
amean          39.456    39.456    39.456
amin           38.916    38.916    38.908
amax           40.104    40.108    40.099
emean           0.266     0.266     0.266
emin            0.251     0.252     0.252
emax            0.281     0.281     0.281
imean           3.955     3.878     3.866
imin            3.504     3.505     3.503
imax            4.554     4.473     4.419
excite_mean     0.274     0.274     0.275
fracstop        1.000     1.000     1.000
cjmean          2.965     2.965     2.965

libcent 0       179.9     180.2     179.8
libamp  0       119.0     119.5     119.5
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       180.4     182.9     182.4
kozaiamp        179.9     179.9     179.9