Orbit Fit and Astrometric record for 17EH56

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: 17EH56    
# Created Tue Apr  1 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   3.00y
# First observation: 2016/04/04
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000093   0.026309   0.000004  -0.001192   0.025353   0.000000
# Chi-squared of fit:     1.99 DOF:     18 RMS:  0.07
# Min/Max residuals:    -0.11    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.625667E-05  2.624866E-02 -3.334073E-07 -1.191345E-03  2.548479E-02  5.539435E-05
# Covariance matrix:
  7.3217E-13 -9.6625E-13 -1.8473E-14  3.6013E-14 -3.0714E-13 -9.1696E-12
 -9.6625E-13  1.7834E-12  3.5802E-14 -7.4376E-14  3.2592E-13  1.9065E-11
 -1.8473E-14  3.5802E-14  3.1909E-13 -1.7221E-13  1.2972E-14  4.1324E-13
  3.6013E-14 -7.4376E-14 -1.7221E-13  1.5225E-13 -1.3755E-14 -8.6832E-13
 -3.0714E-13  3.2592E-13  1.2972E-14 -1.3755E-14  8.9425E-13  3.1825E-12
 -9.1696E-12  1.9065E-11  4.1324E-13 -8.6832E-13  3.1825E-12  2.2283E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    4.673469 -169.535477   -0.075564    0.081062   -0.989993  2457482.949010
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:            2.64139 +/-     0.329
Argument of Peri:      116.48890 +/-     0.395
Long of Asc Node:       70.80438 +/-     0.008
Inclination:             5.24715 +/-     0.000
Eccentricity:         0.08881211 +/-    0.0002
Semi-Major Axis:     44.14926955 +/-    0.0080
Time of Perihelion: 2456694.3344 +/-      97.8
Perihelion:          40.22827989 +/-    0.0102
Aphelion:            48.07025921 +/-    0.0112
Period (y)              293.3550 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.42487982 +/-    0.0014
Ecliptic Y           -7.36057622 +/-    0.0003
Ecliptic Z            3.19710232 +/-    0.0001
Ecliptic XDOT         0.00049621 +/-    0.0000
Ecliptic YDOT        -0.00278297 +/-    0.0000
Ecliptic ZDOT        -0.00012707 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.23332815 +/-    0.0014
Geocenter to KBO     39.23909692 +/-    0.0015
# Hcoef:  8.80

The following table shows the complete astrometric record for 17EH56. 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 (17EH56) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.448221 12 45 47.76   +00 09 26.6         17EH56    T09  C~86v9      
2016 04  04.560026 12 45 47.23   +00 09 29.8         17EH56    T09  C~86v9      
2017 02  21.611762 12 54 10.64   -00 49 32.0         17EH56    T09  C~86v9      
2017 02  23.646095 12 54 03.93   -00 48 40.9         17EH56    T09  C~86v9      
2017 03  06.54520  12 53 23.77   -00 43 49.0   24.8r 17EH56    T09  C~86v9      
2017 03  06.58835  12 53 23.61   -00 43 47.8   25.0r 17EH56    T09  C~86v9      
2017 03  06.63104  12 53 23.43   -00 43 46.7   25.2r 17EH56    T09  C~86v9      
2017 04  27.38837  12 49 32.41   -00 19 53.5   24.4i 17EH56    T09  C~86v9      
2017 04  27.41137  12 49 32.32   -00 19 53.0   24.2i 17EH56    T09  C~86v9      
2017 04  27.42903  12 49 32.23   -00 19 52.7   24.5i 17EH56    T09  C~86v9      
2019 04  06.353478 13 02 01.89   -01 47 17.3         17EH56    T09  C~86v9      
2019 04  06.465808 13 02 01.34   -01 47 14.1         17EH56    T09  C~86v9      

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    -0.08
     2   0.0003     -8.57    -0.01      -0.16    -0.07
     3   0.8848   8330.65     0.02    -306.74    -0.00
     4   0.8903   8217.86    -0.03    -299.04     0.11
     5   0.9202   7548.36    -0.11    -265.85     0.01
     6   0.9203   7545.67     0.10    -265.68     0.10
     7   0.9204   7542.76     0.04    -265.73    -0.03
     8   1.0621   3790.15    -0.03    -301.78     0.05
     9   1.0622   3788.72     0.10    -301.85     0.08
    10   1.0622   3787.36    -0.07    -302.10    -0.09
    11   3.0032  16218.49     0.11    -737.48     0.00
    12   3.0035  16209.60    -0.11    -737.75    -0.07

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.

17EH56    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.647    43.673    43.620
ecceobj         0.078     0.079     0.077
incobj          5.251     5.251     5.251
qmin           39.499    39.513    39.506
qmax           48.539    48.624    48.457
amean          43.877    43.903    43.849
amin           43.533    43.541    43.520
amax           44.263    44.289    44.208
emean           0.079     0.080     0.078
emin            0.063     0.064     0.061
emax            0.097     0.098     0.097
imean           3.617     3.630     3.595
imin            2.833     2.845     2.823
imax            4.332     4.348     4.304
excite_mean     0.101     0.102     0.100
fracstop        1.000     1.000     1.000
cjmean          3.087     3.088     3.087

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       186.1     184.7     187.3
kozaiamp        180.0     180.0     180.0