Orbit Fit and Astrometric record for 17CT58

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: 17CT58    
# Created Tue Apr  1 01:11:03 2025
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     14
# Arc:  90.80d
# First observation: 2017/01/26
#  Last observation: 2017/04/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000009   0.028726   0.000016  -0.001409   0.022231   0.000000
# Chi-squared of fit:    12.20 DOF:     22 RMS:  0.17
# Min/Max residuals:    -0.31    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.757931E-05  2.281871E-02 -9.106383E-07 -9.765723E-04  2.132077E-02  5.651539E-03
# Covariance matrix:
  3.1521E-13 -8.1573E-12 -1.8014E-14  5.1945E-13 -2.8775E-13  2.4100E-10
 -8.1573E-12  5.6808E-09  1.5342E-11 -4.1395E-10  7.0199E-10 -8.4603E-08
 -1.8014E-14  1.5342E-11  2.8930E-13 -2.2721E-12  1.9082E-12 -2.2669E-10
  5.1945E-13 -4.1395E-10 -2.2721E-12  3.9569E-11 -5.1157E-11  6.1940E-09
 -2.8775E-13  7.0199E-10  1.9082E-12 -5.1157E-11  9.2600E-11 -9.1266E-09
  2.4100E-10 -8.4603E-08 -2.2669E-10  6.1940E-09 -9.1266E-09  1.5791E-06
#      lat0       lon0       xBary       yBary       zBary        JD0
  -11.445209  151.389336    0.419070   -0.176944   -0.874864  2457780.042131
# Heliocentric elements and errors
Epoch:              2457780.5000  =  2017/01/27
Mean Anomaly:           11.36845 +/-     1.823
Argument of Peri:      217.47857 +/-     6.916
Long of Asc Node:      254.08152 +/-     0.047
Inclination:            11.52887 +/-     0.002
Eccentricity:         0.51789563 +/-    0.0444
Semi-Major Axis:     91.35504400 +/-    5.4318
Time of Perihelion: 2447708.9584 +/-    1342.7
Perihelion:          44.04266564 +/-    4.8309
Aphelion:           138.66742235 +/-    9.1901
Period (y)              873.1865 +/-     77.88
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -40.94335484 +/-    0.0182
Ecliptic Y           22.80343133 +/-    0.0099
Ecliptic Z           -9.30698307 +/-    0.0042
Ecliptic XDOT        -0.00200288 +/-    0.0001
Ecliptic YDOT        -0.00225041 +/-    0.0001
Ecliptic ZDOT        -0.00026698 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.78048472 +/-    0.0163
Geocenter to KBO     46.90261275 +/-    0.0212
# Hcoef:  8.43

The following table shows the complete astrometric record for 17CT58. 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 (17CT58) followed by the observatory code and reference code for the source of the astrometry.

2017 01  26.54133  09 57 28.01   +00 15 55.7   25.1z 17CT58    T09  C~86us      
2017 01  26.55620  09 57 27.96   +00 15 55.7   24.5z 17CT58    T09  C~86us      
2017 01  26.57229  09 57 27.90   +00 15 55.7   24.6z 17CT58    T09  C~86us      
2017 02  02.37981  09 57 02.08   +00 17 35.4   25.6r 17CT58    T09  C~86us      
2017 02  02.56306  09 57 01.35   +00 17 38.3   25.1i 17CT58    T09  C~86us      
2017 02  02.58245  09 57 01.30   +00 17 38.6   24.6i 17CT58    T09  C~86us      
2017 03  22.24385  09 54 01.10   +00 35 09.3   25.9g 17CT58    T09  C~86us      
2017 03  22.26961  09 54 01.02   +00 35 10.1   26.4g 17CT58    T09  C~86us      
2017 03  22.33107  09 54 00.79   +00 35 11.4   26.1g 17CT58    T09  C~86us      
2017 04  27.32671  09 52 47.37   +00 48 30.5   24.7i 17CT58    T09  C~86us      
2017 04  27.32955  09 52 47.37   +00 48 30.5   24.8i 17CT58    T09  C~86us      
2017 04  27.33527  09 52 47.33   +00 48 30.7   25.1i 17CT58    T09  C~86us      
2017 04  27.33816  09 52 47.33   +00 48 30.8   25.0i 17CT58    T09  C~86us      
2017 04  27.34103  09 52 47.33   +00 48 30.8   24.8i 17CT58    T09  C~86us      

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    -0.14       0.00     0.04
     2   0.0000     -0.70     0.02      -0.26    -0.11
     3   0.0001     -1.55     0.10      -0.58    -0.31
     4   0.0187   -399.28    -0.06     -42.40     0.15
     5   0.0192   -410.55    -0.14     -43.50     0.09
     6   0.0193   -411.36     0.23     -43.49     0.22
     7   0.1498  -3311.31     0.14      -2.66    -0.02
     8   0.1498  -3312.71     0.12      -2.33     0.15
     9   0.1500  -3316.40    -0.28      -2.31    -0.23
    10   0.2486  -4627.78     0.26     362.20     0.07
    11   0.2486  -4627.78     0.31     362.20     0.04
    12   0.2486  -4628.41    -0.22     362.18    -0.05
    13   0.2486  -4628.45    -0.20     362.27     0.00
    14   0.2486  -4628.45    -0.15     362.27    -0.03

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.

17CT58    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        90.941   119.137    81.005
ecceobj         0.517     0.666     0.417
incobj         11.510    11.515    11.505
qmin           42.846    38.372    46.266
qmax          141.328   204.015   117.510
amean          90.613   117.820    80.951
amin           89.266   115.236    79.890
amax           92.549   121.772    82.343
emean           0.515     0.663     0.416
emin            0.505     0.651     0.405
emax            0.527     0.675     0.427
imean          12.777    12.489    12.905
imin           12.462    12.028    12.693
imax           13.171    13.350    13.191
excite_mean     0.560     0.697     0.472
fracstop        1.000     1.000     1.000
cjmean          3.233     3.147     3.279

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       207.1     273.5     180.8
kozaiamp        180.0     180.0     180.0