Orbit Fit and Astrometric record for 21RC237

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: 21RC237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting     10 observations of     10
# Arc:   2.11y
# First observation: 2019/08/29
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000010   0.023736  -0.000000  -0.000023   0.023973   0.000000
# Chi-squared of fit:     0.62 DOF:     14 RMS:  0.04
# Min/Max residuals:    -0.09    0.08
# Exact a, adot, b, bdot, g, gdot:
  1.564118E-05  2.378529E-02 -2.089761E-07 -2.238185E-05  2.397333E-02  1.426453E-03
# Covariance matrix:
  7.2872E-13 -1.8454E-12  4.8571E-16  1.3311E-15 -1.3594E-12 -3.1217E-11
 -1.8454E-12  5.4599E-11 -3.8583E-14 -4.3999E-14  6.0953E-11  1.0746E-09
  4.8571E-16 -3.8583E-14  5.6029E-13 -3.2282E-13 -4.4921E-14 -7.5763E-13
  1.3311E-15 -4.3999E-14 -3.2282E-13  2.5268E-13 -4.9075E-14 -8.7084E-13
 -1.3594E-12  6.0953E-11 -4.4921E-14 -4.9075E-14  6.9326E-11  1.2021E-09
 -3.1217E-11  1.0746E-09 -7.5763E-13 -8.7084E-13  1.2021E-09  2.1257E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.378306   -9.031535    0.265288   -0.023299   -0.968539  2458724.712719
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:           35.54785 +/-     2.509
Argument of Peri:      225.09669 +/-     3.221
Long of Asc Node:       83.36540 +/-     0.052
Inclination:             1.34845 +/-     0.000
Eccentricity:         0.08995564 +/-    0.0041
Semi-Major Axis:     45.90499363 +/-    0.0100
Time of Perihelion: 2447502.9216 +/-     791.7
Perihelion:          41.77558032 +/-    0.1883
Aphelion:            50.03440694 +/-    0.1884
Period (y)              311.0270 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.10196052 +/-    0.0143
Ecliptic Y           -6.96717368 +/-    0.0023
Ecliptic Z           -1.00335913 +/-    0.0003
Ecliptic XDOT         0.00059565 +/-    0.0000
Ecliptic YDOT         0.00265772 +/-    0.0000
Ecliptic ZDOT        -0.00000670 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.68633643 +/-    0.0141
Geocenter to KBO     41.71302426 +/-    0.0145
# Hcoef:  8.20

The following table shows the complete astrometric record for 21RC237. 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 (21RC237) followed by the observatory code and reference code for the source of the astrometry.

2019 08  29.211918 23 28 59.357  -04 50 48.74  24.5r 21RC237   W84  C~7XPn      
2019 08  29.387113 23 28 58.615  -04 50 53.57  24.5r 21RC237   W84  C~7XPn      
2020 10  16.001792 23 30 38.197  -04 40 03.82  24.4r 21RC237   W84  C~7XPn      
2020 10  16.175804 23 30 37.551  -04 40 07.79  24.4r 21RC237   W84  C~7XPn      
2020 10  17.010669 23 30 34.566  -04 40 25.90  24.4r 21RC237   W84  C~7XPn      
2020 10  17.174574 23 30 33.972  -04 40 29.51  24.4r 21RC237   W84  C~7XPn      
2021 09  05.096099 23 38 30.819  -03 49 39.12  24.3r 21RC237   W84  C~7XPn      
2021 09  05.195929 23 38 30.376  -03 49 41.87  24.3r 21RC237   W84  C~7XPn      
2021 10  07.004805 23 36 14.358  -04 04 12.59  24.5r 21RC237   W84  C~7XPn      
2021 10  07.169933 23 36 13.676  -04 04 16.74  24.5r 21RC237   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     0.01       0.00     0.04
     2   0.0005    -12.10    -0.01      -0.07    -0.01
     3   1.1329   1612.12     0.05       9.69     0.01
     4   1.1334   1601.67    -0.06       9.86    -0.09
     5   1.1357   1553.52     0.00      10.83     0.03
     6   1.1361   1543.94     0.01      11.02    -0.03
     7   2.0202   9308.01     0.08     -12.63    -0.02
     8   2.0205   9300.82    -0.08     -12.52     0.08
     9   2.1076   7083.48     0.03      -4.02    -0.02
    10   2.1080   7072.45    -0.03      -3.78     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.

21RC237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.929    46.003    45.873
ecceobj         0.089     0.100     0.081
incobj          1.349     1.349     1.349
qmin           41.233    40.799    41.563
qmax           50.619    51.233    50.179
amean          45.802    45.878    45.745
amin           45.434    45.499    45.366
amax           46.195    46.280    46.145
emean           0.083     0.094     0.075
emin            0.070     0.080     0.062
emax            0.096     0.107     0.088
imean           0.559     0.576     0.549
imin            0.020     0.020     0.020
imax            0.849     0.868     0.845
excite_mean     0.084     0.095     0.076
fracstop        1.000     1.000     1.000
cjmean          3.115     3.114     3.116

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       180.9     179.5     182.2
kozaiamp        179.9     179.9     179.9