Orbit Fit and Astrometric record for 21TP191

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: 21TP191   
# Created Tue Apr  1 01:11:27 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.11y
# First observation: 2019/08/28
#  Last observation: 2021/10/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.023315   0.000001  -0.000987   0.023801   0.000000
# Chi-squared of fit:     4.56 DOF:     10 RMS:  0.13
# Min/Max residuals:    -0.19    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.566471E-05  2.322974E-02 -6.859239E-07 -9.834454E-04  2.367651E-02 -1.238975E-03
# Covariance matrix:
  7.4516E-13  4.4221E-12  2.8332E-14 -1.8536E-13  6.0802E-12  8.6412E-11
  4.4221E-12  2.2716E-09  1.4379E-11 -9.2212E-11  2.6887E-09  4.2988E-08
  2.8332E-14  1.4379E-11  7.1187E-13 -9.1051E-13  1.7014E-11  2.7218E-10
 -1.8536E-13 -9.2212E-11 -9.1051E-13  3.9878E-12 -1.0912E-10 -1.7454E-09
  6.0802E-12  2.6887E-09  1.7014E-11 -1.0912E-10  3.1846E-09  5.0873E-08
  8.6412E-11  4.2988E-08  2.7218E-10 -1.7454E-09  5.0873E-08  8.1370E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.248768   -7.397431    0.309113   -0.020828   -0.955653  2458723.711696
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:          319.18160 +/-    14.182
Argument of Peri:      254.14930 +/-    18.067
Long of Asc Node:      145.54087 +/-     0.012
Inclination:             2.72128 +/-     0.001
Eccentricity:         0.08236365 +/-    0.0321
Semi-Major Axis:     45.91244747 +/-    0.4628
Time of Perihelion: 2471604.4079 +/-    4472.3
Perihelion:          42.13093085 +/-    1.5338
Aphelion:            49.69396410 +/-    1.5567
Period (y)              311.1028 +/-      4.70
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.78542878 +/-    0.0998
Ecliptic Y           -5.87319234 +/-    0.0130
Ecliptic Z           -0.92049174 +/-    0.0022
Ecliptic XDOT         0.00020981 +/-    0.0001
Ecliptic YDOT         0.00268316 +/-    0.0000
Ecliptic ZDOT        -0.00011080 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.19646524 +/-    0.0989
Geocenter to KBO     42.23596299 +/-    0.1007
# Hcoef:  9.34

The following table shows the complete astrometric record for 21TP191. 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 (21TP191) followed by the observatory code and reference code for the source of the astrometry.

2019 08  28.210895 23 34 48.360  -04 04 57.90  25.6r 21TP191   W84  C~7XPu      
2019 08  28.388381 23 34 47.635  -04 05 02.69  25.6r 21TP191   W84  C~7XPu      
2020 10  18.012125 23 36 16.181  -03 59 30.07  25.5r 21TP191   W84  C~7XPu      
2020 10  18.176134 23 36 15.608  -03 59 33.53  25.5r 21TP191   W84  C~7XPu      
2021 10  04.002582 23 42 12.068  -03 24 54.94  25.7r 21TP191   W84  C~7XPu      
2021 10  04.175328 23 42 11.357  -03 24 59.10  25.7r 21TP191   W84  C~7XPu      
2021 10  06.002765 23 42 03.861  -03 25 47.51  25.6r 21TP191   W84  C~7XPu      
2021 10  06.167954 23 42 03.199  -03 25 52.11  25.6r 21TP191   W84  C~7XPu      

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     0.01
     2   0.0005    -11.86     0.03      -0.11     0.01
     3   1.1411   1336.54    -0.19    -218.87    -0.06
     4   1.1416   1327.30     0.19    -218.65     0.01
     5   2.1021   7052.52    -0.19    -427.21    -0.15
     6   2.1026   7041.09     0.17    -426.79     0.18
     7   2.1076   6918.71    -0.09    -426.61     0.18
     8   2.1080   6907.78     0.11    -426.89    -0.19

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.

21TP191    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        46.018    47.450    45.568
ecceobj         0.087     0.175     0.068
incobj          2.716     2.715     2.717
qmin           41.125    37.694    41.776
qmax           50.877    57.337    49.272
amean          45.857    47.243    45.427
amin           45.472    46.804    45.066
amax           46.263    47.764    45.812
emean           0.088     0.181     0.064
emin            0.074     0.162     0.050
emax            0.100     0.200     0.076
imean           2.207     2.084     2.237
imin            1.724     1.327     1.727
imax            2.627     2.903     2.696
excite_mean     0.096     0.185     0.075
fracstop        1.000     1.000     1.000
cjmean          3.113     3.099     3.112

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       186.5     186.8     180.2
kozaiamp        179.9     180.0     180.0