Orbit Fit and Astrometric record for 21RV237

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: 21RV237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.02y
# First observation: 2019/09/29
#  Last observation: 2021/10/06
Preliminary a, adot, b, bdot, g, gdot:
   0.000005   0.028022   0.000017  -0.015374   0.026209   0.000000
# Chi-squared of fit:     1.11 DOF:     10 RMS:  0.07
# Min/Max residuals:    -0.11    0.10
# Exact a, adot, b, bdot, g, gdot:
  1.662133E-05  2.808255E-02 -9.219108E-06 -1.539542E-02  2.601466E-02  1.134273E-03
# Covariance matrix:
  7.0243E-13 -8.4336E-13 -4.3649E-14  2.6671E-13 -1.8887E-13 -8.4267E-12
 -8.4336E-13  6.3763E-12  5.6260E-13 -3.4737E-12  7.7469E-12  1.0977E-10
 -4.3649E-14  5.6260E-13  6.6813E-13 -6.6543E-13  7.3746E-13  1.0150E-11
  2.6671E-13 -3.4737E-12 -6.6543E-13  2.2586E-12 -4.5806E-12 -6.2701E-11
 -1.8887E-13  7.7469E-12  7.3746E-13 -4.5806E-12  1.4187E-11  1.4476E-10
 -8.4267E-12  1.0977E-10  1.0150E-11 -6.2701E-11  1.4476E-10  1.9814E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.474587   -9.255357   -0.258952   -0.007984   -0.965614  2458755.514497
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:            1.97173 +/-     0.063
Argument of Peri:      173.68514 +/-     0.233
Long of Asc Node:      170.26620 +/-     0.000
Inclination:            28.72423 +/-     0.001
Eccentricity:         0.51833085 +/-    0.0003
Semi-Major Axis:     81.59549682 +/-    0.0720
Time of Perihelion: 2457276.0076 +/-      46.9
Perihelion:          39.30203392 +/-    0.0448
Aphelion:           123.88895973 +/-    0.1130
Period (y)              737.0679 +/-      0.98
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           38.93594933 +/-    0.0055
Ecliptic Y           -6.08893279 +/-    0.0009
Ecliptic Z           -0.31876847 +/-    0.0001
Ecliptic XDOT         0.00058841 +/-    0.0000
Ecliptic YDOT         0.00290089 +/-    0.0000
Ecliptic ZDOT        -0.00162142 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.41046646 +/-    0.0054
Geocenter to KBO     38.43985701 +/-    0.0056
# Hcoef:  8.88

The following table shows the complete astrometric record for 21RV237. 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 (21RV237) followed by the observatory code and reference code for the source of the astrometry.

2019 09  29.013696 23 26 44.137  -04 06 15.78  24.8r 21RV237   W84  C~7XPo      
2019 09  29.177510 23 26 43.415  -04 06 21.76  24.8r 21RV237   W84  C~7XPo      
2020 10  18.012125 23 32 45.143  -04 27 55.29  24.8r 21RV237   W84  C~7XPo      
2020 10  18.176134 23 32 44.556  -04 28 00.29  24.8r 21RV237   W84  C~7XPo      
2021 09  09.073508 23 42 47.705  -04 14 40.00  24.7r 21RV237   W84  C~7XPo      
2021 09  09.192572 23 42 47.184  -04 14 44.62  24.7r 21RV237   W84  C~7XPo      
2021 10  06.002765 23 40 50.463  -04 31 19.44  24.7r 21RV237   W84  C~7XPo      
2021 10  06.167954 23 40 49.782  -04 31 25.29  24.7r 21RV237   W84  C~7XPo      

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     0.09       0.00    -0.03
     2   0.0004    -12.28    -0.08      -1.25     0.05
     3   1.0541   4450.42    -0.07   -3325.18    -0.03
     4   1.0545   4440.37     0.04   -3326.30    -0.02
     5   1.9468  13058.76    -0.03   -6180.62     0.09
     6   1.9471  13049.73     0.02   -6181.74    -0.02
     7   2.0205  11044.74    -0.08   -6398.21     0.07
     8   2.0210  11033.03     0.10   -6399.52    -0.11

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.

21RV237    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        81.580    81.776    81.386
ecceobj         0.519     0.520     0.517
incobj         28.689    28.689    28.689
qmin           37.323    37.355    37.183
qmax          127.160   127.460   127.020
amean          80.992    81.144    80.822
amin           79.842    79.985    79.655
amax           82.622    82.801    82.481
emean           0.521     0.521     0.521
emin            0.506     0.506     0.505
emax            0.539     0.539     0.540
imean          27.556    27.567    27.474
imin           26.717    26.755    26.574
imax           28.328    28.347    28.312
excite_mean     0.696     0.697     0.696
fracstop        1.000     1.000     1.000
cjmean          2.854     2.854     2.854

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       238.2     241.9     233.3
kozaiamp        180.0     179.9     180.0