Orbit Fit and Astrometric record for 18JT6

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: 18JT6     
# Created Tue Apr  1 01:11:09 2025
# Orbit generated from Bernstein formalism
# Fitting      5 observations of      5
# Arc:   0.81y
# First observation: 2018/05/10
#  Last observation: 2019/03/01
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.011448  -0.000000   0.005005   0.016554   0.000000
# WARNING Fitting with energy constraint
# WARNING MRQMIN stopped after  13 iterations -- oscilliatory solution
# Chi-squared of fit:     0.48 DOF:      5 RMS:  0.05
# Min/Max residuals:    -0.08    0.08
# Exact a, adot, b, bdot, g, gdot:
  1.074850E-05  1.113578E-02  4.341036E-06  4.976793E-03  1.659136E-02 -5.075096E-03
# Covariance matrix:
  9.8789E-13  2.2542E-11 -6.2584E-14  1.2729E-11  4.4550E-11  3.1109E-09
  2.2542E-11  2.8798E-08 -9.5748E-12  4.7301E-09  5.9713E-09  1.3309E-06
 -6.2584E-14 -9.5748E-12  7.5145E-13 -4.5725E-12 -1.1302E-11 -9.1827E-10
  1.2729E-11  4.7301E-09 -4.5725E-12  1.1164E-09  2.4901E-09  2.9568E-07
  4.4550E-11  5.9713E-09 -1.1302E-11  2.4901E-09  7.9868E-09  6.2061E-07
  3.1109E-09  1.3309E-06 -9.1827E-10  2.9568E-07  6.2061E-07  7.9108E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -12.270749 -176.108339   -0.720971   -0.148450   -0.682953  2458249.469771
# Heliocentric elements and errors
Epoch:              2458240.5000  =  2018/05/02
Mean Anomaly:          289.05076 +/-   110.197
Argument of Peri:       86.47988 +/-    39.346
Long of Asc Node:      209.77951 +/-     0.173
Inclination:            26.79411 +/-     0.148
Eccentricity:         0.37530225 +/-    0.5596
Semi-Major Axis:     60.01240231 +/-   29.9377
Time of Perihelion: 2491706.6052 +/-   45548.8
Perihelion:          37.48961295 +/-   38.4386
Aphelion:            82.53519167 +/-   53.1320
Period (y)              464.9109 +/-    347.89
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -59.40891215 +/-    0.3165
Ecliptic Y           -4.77135008 +/-    0.0215
Ecliptic Z          -12.80950638 +/-    0.0690
Ecliptic XDOT         0.00077379 +/-    0.0014
Ecliptic YDOT        -0.00179376 +/-    0.0001
Ecliptic ZDOT         0.00098032 +/-    0.0003
# Distances at JD0 (AU)
Heliocenter to KBO   60.96120141 +/-    0.3088
Geocenter to KBO     60.27233266 +/-    0.3247
# Hcoef:  6.80

The following table shows the complete astrometric record for 18JT6. 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 (18JT6) followed by the observatory code and reference code for the source of the astrometry.

2018 05  10.96897  11 54 25.873  -12 47 23.15  24.6r 18JT6     807  C~31M1      
2018 05  11.96567  11 54 24.059  -12 46 58.76  24.4r 18JT6     807  C~31M1      
2019 02  28.16680  12 00 48.082  -13 16 04.05  24.6r 18JT6     304  C~31M1      
2019 02  28.21810  12 00 47.930  -13 16 03.19  24.7r 18JT6     304  C~31M1      
2019 03  01.34118  12 00 44.521  -13 15 44.63  24.6r 18JT6     304  C~31M1      

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    -0.03       0.00     0.08
     2   0.0027    -34.16     0.03      11.48    -0.08
     3   0.8027   5806.12    -0.01     683.23     0.02
     4   0.8029   5803.74     0.04     683.13     0.07
     5   0.8059   5750.66    -0.03     680.15    -0.08

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.

18JT6    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0