Orbit Fit and Astrometric record for 21RA237

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: 21RA237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.03y
# First observation: 2019/09/27
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000035   0.032553  -0.000000  -0.000980   0.027943   0.000000
# Chi-squared of fit:     2.27 DOF:     10 RMS:  0.09
# Min/Max residuals:    -0.20    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.881546E-05  3.293335E-02 -3.070080E-07 -9.906077E-04  2.804895E-02  5.830227E-03
# Covariance matrix:
  7.3181E-13 -1.2151E-12 -4.0869E-15  2.6249E-14 -6.2403E-13 -1.3033E-11
 -1.2151E-12  1.0086E-11  4.5030E-14 -3.0378E-13  1.1060E-11  1.5092E-10
 -4.0869E-15  4.5030E-14  6.1782E-13 -3.4640E-13  4.9871E-14  6.9185E-13
  2.6249E-14 -3.0378E-13 -3.4640E-13  2.8551E-13 -3.4919E-13 -4.6799E-12
 -6.2403E-13  1.1060E-11  4.9871E-14 -3.4919E-13  1.5910E-11  1.7354E-10
 -1.3033E-11  1.5092E-10  6.9185E-13 -4.6799E-12  1.7354E-10  2.3250E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.669601  -10.598355   -0.248502   -0.011308   -0.968650  2458753.515384
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:           18.24174 +/-     0.088
Argument of Peri:      160.22803 +/-     0.243
Long of Asc Node:      149.08562 +/-     0.011
Inclination:             1.84395 +/-     0.001
Eccentricity:         0.36684812 +/-    0.0010
Semi-Major Axis:     54.13095950 +/-    0.0352
Time of Perihelion: 2451379.4278 +/-      34.7
Perihelion:          34.27311862 +/-    0.0580
Aphelion:            73.98880038 +/-    0.0720
Period (y)              398.2693 +/-      0.39
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.04237128 +/-    0.0050
Ecliptic Y           -6.49759874 +/-    0.0009
Ecliptic Z           -0.41667091 +/-    0.0001
Ecliptic XDOT         0.00115796 +/-    0.0000
Ecliptic YDOT         0.00305622 +/-    0.0000
Ecliptic ZDOT        -0.00010357 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.62574138 +/-    0.0049
Geocenter to KBO     35.65195686 +/-    0.0051
# Hcoef:  9.27

The following table shows the complete astrometric record for 21RA237. 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 (21RA237) followed by the observatory code and reference code for the source of the astrometry.

2019 09  27.014583 23 22 05.316  -04 48 41.34  24.8r 21RA237   W84  C~7XPn      
2019 09  27.176040 23 22 04.540  -04 48 46.17  24.8r 21RA237   W84  C~7XPn      
2020 10  17.010669 23 27 34.902  -04 17 15.00  24.9r 21RA237   W84  C~7XPn      
2020 10  17.174574 23 27 34.252  -04 17 19.16  24.9r 21RA237   W84  C~7XPn      
2021 09  05.096099 23 37 45.471  -03 15 07.63  24.9r 21RA237   W84  C~7XPn      
2021 09  05.195929 23 37 44.962  -03 15 10.86  24.9r 21RA237   W84  C~7XPn      
2021 10  07.004805 23 35 13.137  -03 31 44.27  24.8r 21RA237   W84  C~7XPn      
2021 10  07.169933 23 35 12.380  -03 31 49.27  24.8r 21RA237   W84  C~7XPn      

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    -0.05       0.00    -0.05
     2   0.0004    -12.56     0.05       0.11     0.03
     3   1.0568   5274.09    -0.02    -203.78     0.07
     4   1.0572   5263.51     0.03    -203.77    -0.03
     5   1.9414  15167.86     0.20    -395.47     0.01
     6   1.9416  15159.54    -0.20    -395.41     0.10
     7   2.0287  12667.28     0.07    -405.86     0.02
     8   2.0292  12654.85    -0.07    -405.96    -0.16

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.

21RA237    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        54.047    54.199    53.899
ecceobj         0.365     0.369     0.362
incobj          1.837     1.837     1.837
qmin           32.021    33.537    33.206
qmax           91.419    77.587    88.282
amean          55.907    54.129    55.025
amin           51.517    52.764    52.079
amax           62.213    55.854    61.174
emean           0.392     0.361     0.378
emin            0.353     0.339     0.346
emax            0.470     0.389     0.447
imean           4.481     3.921     2.994
imin            1.233     1.233     1.233
imax            8.793     5.562     4.882
excite_mean     0.400     0.367     0.382
fracstop        1.000     1.000     1.000
cjmean          3.035     3.051     3.046

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       176.6     186.2     179.2
kozaiamp        179.9     179.9     180.0