Orbit Fit and Astrometric record for 17DO171

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: 17DO171   
# Created Wed Dec 25 02:10:55 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     14 observations of     14
# Arc:   7.05y
# First observation: 2012/03/16
#  Last observation: 2019/04/03
# Chi-squared of fit:     8.64 DOF:     22 RMS:  0.14
# Min/Max residuals:    -0.34    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.264566E-05  1.772157E-02 -1.052124E-05 -1.357821E-02  2.083986E-02 -7.759859E-03
# Covariance matrix:
  7.1777E-13 -1.7838E-13 -2.0689E-14  3.9187E-14 -1.5659E-13 -4.7292E-13
 -1.7838E-13  2.6836E-13  8.8943E-14 -1.7771E-13 -1.4788E-13  2.1260E-12
 -2.0689E-14  8.8943E-14  7.0783E-13 -1.9655E-13 -3.9810E-14  7.9478E-13
  3.9187E-14 -1.7771E-13 -1.9655E-13  1.6184E-13  9.1506E-14 -1.5852E-12
 -1.5659E-13 -1.4788E-13 -3.9810E-14  9.1506E-14  1.1283E-12 -1.0718E-12
 -4.7292E-13  2.1260E-12  7.9478E-13 -1.5852E-12 -1.0718E-12  1.8970E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.543581 -177.477394    0.112348    0.147263   -0.980328  2456002.819169
# Heliocentric elements and errors
Epoch:              2456002.5000  =  2012/03/16
Mean Anomaly:          351.05392 +/-     0.009
Argument of Peri:      215.91069 +/-     0.025
Long of Asc Node:       13.10385 +/-     0.000
Inclination:            38.35997 +/-     0.000
Eccentricity:         0.64726219 +/-    0.0002
Semi-Major Axis:    119.70375300 +/-    0.0774
Time of Perihelion: 2467890.0018 +/-     452.7
Perihelion:          42.22404023 +/-    0.0380
Aphelion:           197.18346576 +/-    0.1302
Period (y)             1309.6940 +/-      1.27
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -48.39895074 +/-    0.0024
Ecliptic Y           -2.01889817 +/-    0.0001
Ecliptic Z            7.12824311 +/-    0.0004
Ecliptic XDOT         0.00084007 +/-    0.0000
Ecliptic YDOT        -0.00228926 +/-    0.0000
Ecliptic ZDOT        -0.00191540 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.96298294 +/-    0.0024
Geocenter to KBO     47.98527281 +/-    0.0024
# Hcoef:  8.21

The following table shows the complete astrometric record for 17DO171. 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 (17DO171) followed by the observatory code and reference code for the source of the astrometry.

2012 03  16.318403 12 22 53.76   +06 50 01.6         17DO171   695  C~89Ua      
2012 03  16.395671 12 22 53.42   +06 50 03.2         17DO171   695  C~89Ua      
2017 01  30.623424 12 38 11.11   +00 49 00.1         17DO171   T09  C~89Ua      
2017 01  30.626122 12 38 11.12   +00 49 00.1         17DO171   T09  C~89Ua      
2017 01  30.640269 12 38 11.08   +00 49 00.1         17DO171   T09  C~89Ua      
2017 02  02.624862 12 38 05.03   +00 49 28.7         17DO171   T09  C~89Ua      
2017 02  21.50560  12 37 13.24   +00 53 39.4   24.6z 17DO171   T09  C~89Ua      
2017 02  21.55007  12 37 13.08   +00 53 40.2   24.9z 17DO171   T09  C~89Ua      
2017 02  21.59307  12 37 12.92   +00 53 41.1   24.5z 17DO171   T09  C~89Ua      
2017 02  23.55566  12 37 06.37   +00 54 12.8   24.7r 17DO171   T09  C~89Ua      
2017 02  23.62075  12 37 06.13   +00 54 13.6   25.0r 17DO171   T09  C~89Ua      
2017 02  23.65038  12 37 06.06   +00 54 14.3   25.3r 17DO171   T09  C~89Ua      
2017 04  02.485751 12 34 34.40   +01 05 47.6         17DO171   T09  C~89Ua      
2019 04  03.472245 12 39 55.48   -01 21 20.5         17DO171   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     0.17       0.00    -0.02
     2   0.0002      0.00    -0.12       0.00     0.05
     3   4.8769      0.00    -0.08       0.00    -0.05
     4   4.8770      0.00     0.15       0.00    -0.08
     5   4.8770      0.00    -0.03       0.00    -0.20
     6   4.8852      0.00     0.03       0.00    -0.06
     7   4.9369      0.00     0.04       0.00    -0.03
     8   4.9370      0.00    -0.12       0.00     0.06
     9   4.9371      0.00    -0.34       0.00     0.27
    10   4.9425      0.00     0.00       0.00     0.10
    11   4.9426      0.00    -0.21       0.00    -0.17
    12   4.9427      0.00     0.28       0.00     0.04
    13   5.0463      0.00     0.05       0.00     0.10
    14   7.0476      0.00     0.10       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.

17DO171    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       119.068   119.066   119.070
ecceobj         0.645     0.645     0.645
incobj         38.401    38.401    38.401
qmin           39.998    40.731    40.026
qmax          207.102   206.782   207.841
amean         120.366   120.436   120.503
amin          117.798   117.861   117.985
amax          124.223   124.364   124.536
emean           0.653     0.651     0.654
emin            0.640     0.640     0.640
emax            0.668     0.663     0.669
imean          38.070    38.330    38.100
imin           37.540    37.981    37.582
imax           38.801    38.801    38.801
excite_mean     0.898     0.899     0.899
fracstop        1.000     1.000     1.000
cjmean          2.632     2.632     2.632

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       246.2     245.0     245.9
kozaiamp         33.8      32.2      33.6