Orbit Fit and Astrometric record for 21RM238

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: 21RM238   
# Created Wed Dec 25 02:11:14 2024
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   2.90y
# First observation: 2019/09/29
#  Last observation: 2022/08/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000073   0.023204   0.000124  -0.010451   0.024100   0.000000
# Chi-squared of fit:     1.82 DOF:     18 RMS:  0.07
# Min/Max residuals:    -0.18    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.563969E-05  2.271906E-02 -7.216388E-06 -1.016074E-02  2.289998E-02 -8.895927E-03
# Covariance matrix:
  6.7649E-13 -5.0477E-13 -3.4843E-14  8.7641E-14  2.2859E-13 -2.7572E-12
 -5.0477E-13  1.1849E-12  2.0963E-13 -5.3230E-13  1.5005E-12  1.6734E-11
 -3.4843E-14  2.0963E-13  5.4471E-13 -3.2671E-13  4.4936E-13  3.7296E-12
  8.7641E-14 -5.3230E-13 -3.2671E-13  4.1586E-13 -1.1467E-12 -9.4868E-12
  2.2859E-13  1.5005E-12  4.4936E-13 -1.1467E-12  6.4177E-12  3.6033E-11
 -2.7572E-12  1.6734E-11  3.7296E-12 -9.4868E-12  3.6033E-11  2.9819E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.445552   -7.972658   -0.237270   -0.007537   -0.971172  2458755.514497
# Heliocentric elements and errors
Epoch:              2458750.5000  =  2019/09/24
Mean Anomaly:          346.92596 +/-     0.042
Argument of Peri:      234.95510 +/-     0.044
Long of Asc Node:      171.34553 +/-     0.000
Inclination:            24.03826 +/-     0.001
Eccentricity:         0.58004686 +/-    0.0010
Semi-Major Axis:     90.28366432 +/-    0.1918
Time of Perihelion: 2470129.9051 +/-       4.0
Perihelion:          37.91490812 +/-    0.1222
Aphelion:           142.65242052 +/-    0.3167
Period (y)              857.8710 +/-      2.73
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           44.24258611 +/-    0.0048
Ecliptic Y           -5.96324301 +/-    0.0007
Ecliptic Z           -0.33990650 +/-    0.0001
Ecliptic XDOT        -0.00067738 +/-    0.0000
Ecliptic YDOT         0.00283971 +/-    0.0000
Ecliptic ZDOT        -0.00120671 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.64394953 +/-    0.0047
Geocenter to KBO     43.66815190 +/-    0.0048
# Hcoef:  7.86

The following table shows the complete astrometric record for 21RM238. 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 (21RM238) followed by the observatory code and reference code for the source of the astrometry.

2019 09  29.013696 23 31 24.936  -03 34 19.62  24.2r 21RM238   W84  C~7XPp      
2019 09  29.177510 23 31 24.289  -03 34 24.75  24.2r 21RM238   W84  C~7XPp      
2020 10  18.012125 23 35 58.773  -03 45 10.40  24.1r 21RM238   W84  C~7XPp      
2020 10  18.176134 23 35 58.220  -03 45 14.78  24.1r 21RM238   W84  C~7XPp      
2021 09  09.073508 23 44 22.749  -03 25 57.35  24.1r 21RM238   W84  C~7XPp      
2021 09  09.192572 23 44 22.251  -03 26 01.52  24.1r 21RM238   W84  C~7XPp      
2021 10  06.002765 23 42 34.717  -03 40 24.01  24.1r 21RM238   W84  C~7XPp      
2021 10  06.167954 23 42 34.057  -03 40 29.11  24.1r 21RM238   W84  C~7XPp      
2022 08  24.28478  23 51 23.28   -03 18 05.7   24.4V 21RM238   W84  C~7XPp      
2022 08  24.30900  23 51 23.20   -03 18 06.5   24.7V 21RM238   W84  C~7XPp      
2022 08  24.35714  23 51 23.02   -03 18 08.0   24.3V 21RM238   W84  C~7XPp      
2022 08  24.38125  23 51 22.93   -03 18 08.7   24.6V 21RM238   W84  C~7XPp      

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   0.0004    -10.92     0.01      -0.89     0.01
     3   1.0541   3508.57    -0.00   -2218.39    -0.00
     4   1.0545   3499.23     0.00   -2219.14     0.00
     5   1.9468  10902.55     0.12   -4158.32     0.03
     6   1.9471  10894.03    -0.18   -4159.17    -0.13
     7   2.0205   9069.32     0.12   -4309.60    -0.04
     8   2.0210   9058.20    -0.11   -4310.35    -0.01
     9   2.9029  16896.75     0.00   -6247.63     0.06
    10   2.9029  16895.33     0.08   -6247.88    -0.03
    11   2.9031  16892.23    -0.01   -6248.18    -0.00
    12   2.9031  16890.71    -0.04   -6248.28     0.06

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.

21RM238    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        91.368    91.863    90.881
ecceobj         0.586     0.588     0.584
incobj         23.990    23.989    23.992
qmin           36.553    36.555    36.582
qmax          147.452   148.217   146.089
amean          90.173    90.677    89.709
amin           88.641    89.176    88.217
amax           92.427    92.852    91.771
emean           0.579     0.582     0.578
emin            0.564     0.567     0.567
emax            0.595     0.597     0.592
imean          23.502    23.505    23.344
imin           22.737    22.731    22.735
imax           24.517    24.560    24.009
excite_mean     0.703     0.705     0.701
fracstop        1.000     1.000     1.000
cjmean          2.921     2.920     2.921

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       200.4     199.5     215.9
kozaiamp        180.0     180.0     180.0