Orbit Fit and Astrometric record for 17DH171

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: 17DH171   
# Created Wed Dec 25 02:10:54 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     23 observations of     23
# Arc:  15.37y
# First observation: 2003/12/26
#  Last observation: 2019/05/09
# Chi-squared of fit:     9.11 DOF:     40 RMS:  0.11
# Min/Max residuals:    -0.27    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.737818E-05  2.548134E-02  2.049282E-06  2.430203E-03  2.470780E-02 -1.535257E-04
# Covariance matrix:
  2.9266E-13 -4.9416E-14  2.8612E-15 -2.8891E-15 -1.6074E-14 -7.8191E-14
 -4.9416E-14  3.3591E-14 -3.1258E-15  3.1637E-15  1.6841E-14  8.5544E-14
  2.8612E-15 -3.1258E-15  2.6650E-13 -2.0824E-14 -1.4667E-15 -8.5054E-15
 -2.8891E-15  3.1637E-15 -2.0824E-14  2.3740E-15 -2.2438E-15  9.3018E-15
 -1.6074E-14  1.6841E-14 -1.4667E-15 -2.2438E-15  3.6965E-13 -2.1452E-14
 -7.8191E-14  8.5544E-14 -8.5054E-15  9.3018E-15 -2.1452E-14  2.4422E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.374339  169.328037    0.947961    0.014788   -0.249731  2453000.055581
# Heliocentric elements and errors
Epoch:              2453000.5000  =  2003/12/27
Mean Anomaly:          347.69756 +/-     0.013
Argument of Peri:       46.97947 +/-     0.016
Long of Asc Node:      136.78527 +/-     0.001
Inclination:             6.45074 +/-     0.000
Eccentricity:         0.11644063 +/-    0.0001
Semi-Major Axis:     45.92893682 +/-    0.0053
Time of Perihelion: 2456885.7311 +/-      19.4
Perihelion:          40.58094248 +/-    0.0059
Aphelion:            51.27693116 +/-    0.0069
Period (y)              311.2704 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.77786858 +/-    0.0010
Ecliptic Y            8.46211307 +/-    0.0002
Ecliptic Z            2.38229388 +/-    0.0001
Ecliptic XDOT        -0.00049485 +/-    0.0000
Ecliptic YDOT        -0.00278714 +/-    0.0000
Ecliptic ZDOT         0.00026797 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.73773473 +/-    0.0010
Geocenter to KBO     40.47307119 +/-    0.0010
# Hcoef:  7.02

The following table shows the complete astrometric record for 17DH171. 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 (17DH171) followed by the observatory code and reference code for the source of the astrometry.

2003 12  26.554838 11 26 05.68   +07 19 38.3         17DH171   T14  C~89Ua      
2003 12  26.590217 11 26 05.68   +07 19 38.6         17DH171   T14  C~89Ua      
2003 12  27.486104 11 26 05.31   +07 19 47.3         17DH171   T14  C~89Ua      
2003 12  27.526826 11 26 05.30   +07 19 47.8         17DH171   T14  C~89Ua      
2003 12  27.567228 11 26 05.27   +07 19 48.1         17DH171   T14  C~89Ua      
2013 02  03.313950 12 15 55.26   +03 18 06.4   22.9z 17DH171   W84  C~89Ua      
2013 02  03.329577 12 15 55.21   +03 18 07.0   22.8z 17DH171   W84  C~89Ua      
2013 04  03.246863 12 11 58.96   +03 47 21.0   22.7z 17DH171   W84  C~89Ua      
2014 02  23.338469 12 20 32.08   +02 57 50.9   22.2i 17DH171   W84  C~89Ua      
2014 02  24.296318 12 20 28.46   +02 58 19.5   23.3i 17DH171   W84  C~89Ua      
2017 02  02.624862 12 38 33.66   +01 20 38.6         17DH171   T09  C~89Ua      
2017 02  21.50560  12 37 41.29   +01 28 32.7   23.1z 17DH171   T09  C~89Ua      
2017 02  21.55007  12 37 41.13   +01 28 33.9   23.3z 17DH171   T09  C~89Ua      
2017 02  21.57161  12 37 41.04   +01 28 34.6   23.5z 17DH171   T09  C~89Ua      
2017 02  23.58678  12 37 34.05   +01 29 32.2   22.7r 17DH171   T09  C~89Ua      
2017 02  23.58888  12 37 34.01   +01 29 32.0   23.2r 17DH171   T09  C~89Ua      
2017 02  23.62075  12 37 33.92   +01 29 32.8   22.6r 17DH171   T09  C~89Ua      
2017 04  02.385436 12 34 53.37   +01 48 51.6         17DH171   T09  C~89Ua      
2017 04  02.456068 12 34 53.04   +01 48 53.7         17DH171   T09  C~89Ua      
2018 05  17.063363 12 37 39.168  +01 36 10.37  23.7g 17DH171   W84  C~8HKW      
2019 04  03.426512 12 46 14.92   +00 49 40.9         17DH171   T09  C~89Ua      
2019 04  03.461545 12 46 14.75   +00 49 42.0         17DH171   T09  C~89Ua      
2019 05  09.446752 12 43 43.83   +01 04 36.8         17DH171   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    -0.25       0.00    -0.01
     2   0.0001      0.00    -0.00       0.00    -0.04
     3   0.0025      0.00    -0.00       0.00    -0.00
     4   0.0027      0.00     0.17       0.00     0.09
     5   0.0028      0.00     0.04       0.00    -0.02
     6   9.1082      0.00     0.00       0.00    -0.18
     7   9.1082      0.00    -0.12       0.00     0.05
     8   9.2695      0.00     0.15       0.00     0.21
     9  10.1623      0.00    -0.08       0.00    -0.03
    10  10.1649      0.00     0.03       0.00    -0.02
    11  13.1063      0.00     0.07       0.00    -0.06
    12  13.1580      0.00     0.02       0.00     0.03
    13  13.1581      0.00    -0.04       0.00    -0.03
    14  13.1582      0.00    -0.26       0.00     0.06
    15  13.1637      0.00     0.22       0.00     0.22
    16  13.1637      0.00    -0.27       0.00    -0.04
    17  13.1638      0.00     0.11       0.00    -0.16
    18  13.2672      0.00     0.07       0.00    -0.03
    19  13.2674      0.00     0.04       0.00    -0.04
    20  14.3888      0.00    -0.03       0.00     0.02
    21  15.2686      0.00     0.12       0.00    -0.01
    22  15.2687      0.00     0.01       0.00     0.04
    23  15.3673      0.00    -0.14       0.00     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.

17DH171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.399    45.399    45.399
ecceobj         0.106     0.106     0.106
incobj          6.468     6.468     6.468
qmin           39.960    39.959    39.963
qmax           51.548    51.585    51.531
amean          45.632    45.632    45.632
amin           45.249    45.250    45.250
amax           46.035    46.043    46.049
emean           0.107     0.107     0.107
emin            0.094     0.094     0.094
emax            0.121     0.121     0.120
imean           5.296     5.296     5.296
imin            4.817     4.816     4.816
imax            5.828     5.828     5.828
excite_mean     0.141     0.141     0.141
fracstop        1.000     1.000     1.000
cjmean          3.097     3.097     3.097

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       177.3     177.3     177.2
kozaiamp        180.0     180.0     180.0