Orbit Fit and Astrometric record for 17EA58

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: 17EA58    
# Created Tue Apr  1 01:11:06 2025
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   2.12y
# First observation: 2017/02/21
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000002   0.027762   0.000000  -0.004821   0.026448   0.000000
# Chi-squared of fit:     6.25 DOF:     20 RMS:  0.12
# Min/Max residuals:    -0.18    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.560230E-05  2.749200E-02 -4.448711E-06 -4.771649E-03  2.627633E-02 -1.100889E-03
# Covariance matrix:
  4.9615E-13  4.6438E-12  8.5644E-14 -1.0486E-12  1.7057E-12  1.0535E-10
  4.6438E-12  5.1203E-10  1.0178E-11 -1.1352E-10  1.3515E-10  1.1428E-08
  8.5644E-14  1.0178E-11  3.5288E-13 -2.3476E-12  2.6747E-12  2.2727E-10
 -1.0486E-12 -1.1352E-10 -2.3476E-12  2.5389E-11 -2.9973E-11 -2.5347E-09
  1.7057E-12  1.3515E-10  2.6747E-12 -2.9973E-11  3.6374E-11  3.0172E-09
  1.0535E-10  1.1428E-08  2.2727E-10 -2.5347E-09  3.0172E-09  2.5518E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    6.090146 -164.113825    0.676864    0.076532   -0.715948  2457806.147679
# Heliocentric elements and errors
Epoch:              2457800.5000  =  2017/02/16
Mean Anomaly:          337.19936 +/-     6.107
Argument of Peri:      177.64717 +/-     8.208
Long of Asc Node:       46.15049 +/-     0.008
Inclination:            11.40274 +/-     0.003
Eccentricity:         0.12799574 +/-    0.0083
Semi-Major Axis:     43.82510265 +/-    0.0357
Time of Perihelion: 2464512.1198 +/-    1797.5
Perihelion:          38.21567629 +/-    0.3655
Aphelion:            49.43452902 +/-    0.3664
Period (y)              290.1300 +/-      0.35
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -37.27787503 +/-    0.0084
Ecliptic Y           -9.90939452 +/-    0.0024
Ecliptic Z            4.03743157 +/-    0.0009
Ecliptic XDOT         0.00084620 +/-    0.0000
Ecliptic YDOT        -0.00274499 +/-    0.0000
Ecliptic ZDOT        -0.00050661 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   38.78320410 +/-    0.0081
Geocenter to KBO     38.05706195 +/-    0.0087
# Hcoef:  8.27

The following table shows the complete astrometric record for 17EA58. 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 (17EA58) followed by the observatory code and reference code for the source of the astrometry.

2017 02  21.646878 13 07 53.81   -00 37 34.4         17EA58    T09  C~8AiC      
2017 03  06.56598  13 07 07.57   -00 32 00.9   24.3r 17EA58    T09  C~8AiC      
2017 03  06.59253  13 07 07.47   -00 32 00.3   24.4r 17EA58    T09  C~8AiC      
2017 03  06.63524  13 07 07.29   -00 31 58.9   24.5r 17EA58    T09  C~8AiC      
2017 03  29.459413 13 05 25.28   -00 21 10.4         17EA58    T09  C~8AiC      
2017 04  26.349730 13 03 11.33   -00 09 08.9         17EA58    T09  C~8AiC      
2017 04  26.407962 13 03 11.07   -00 09 07.7         17EA58    T09  C~8AiC      
2017 04  29.33613  13 02 57.87   -00 08 05.1   23.6z 17EA58    T09  C~8AiC      
2017 04  29.38224  13 02 57.64   -00 08 04.1   23.6z 17EA58    T09  C~8AiC      
2017 04  29.39855  13 02 57.57   -00 08 03.8   23.8z 17EA58    T09  C~8AiC      
2017 04  29.42279  13 02 57.45   -00 08 03.3   23.9z 17EA58    T09  C~8AiC      
2019 04  04.539227 13 15 54.66   -02 02 16.5         17EA58    T09  C~8AiC      
2019 04  06.512387 13 15 45.01   -02 01 22.0         17EA58    T09  C~8AiC      

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     0.19       0.00     0.33
     2   0.0354   -768.40    -0.14      42.75    -0.09
     3   0.0354   -770.01     0.02      42.73    -0.17
     4   0.0356   -773.04    -0.16      42.99     0.01
     5   0.0980  -2434.95     0.07      56.61    -0.06
     6   0.1744  -4567.97    -0.01     -45.80    -0.08
     7   0.1746  -4572.04     0.17     -46.19    -0.09
     8   0.1826  -4779.03     0.19     -64.14     0.11
     9   0.1827  -4782.60    -0.11     -64.54     0.04
    10   0.1828  -4783.68    -0.04     -64.66     0.03
    11   0.1828  -4785.54    -0.18     -64.89    -0.03
    12   2.1133   8611.02     0.09   -1940.63    -0.01
    13   2.1187   8456.24    -0.09   -1945.48     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.

17EA58    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        43.286    43.589    43.204
ecceobj         0.118     0.113     0.133
incobj         11.443    11.434    11.449
qmin           37.240    36.664    36.682
qmax           50.064    51.413    50.535
amean          43.538    43.776    43.447
amin           43.172    43.260    43.086
amax           43.927    44.252    43.852
emean           0.121     0.124     0.133
emin            0.103     0.091     0.115
emax            0.140     0.162     0.153
imean          10.029     9.869     9.918
imin            9.192     8.792     8.998
imax           10.928    10.899    11.003
excite_mean     0.212     0.212     0.218
fracstop        1.000     1.000     1.000
cjmean          3.042     3.045     3.038

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       185.6     183.2     183.6
kozaiamp        180.0     180.0     180.0