Orbit Fit and Astrometric record for 21MA23

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: 21MA23    
# Created Tue Apr  1 01:11:25 2025
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:   1.34y
# First observation: 2021/06/17
#  Last observation: 2022/10/21
Preliminary a, adot, b, bdot, g, gdot:
  -0.000031   0.024396  -0.000002  -0.000703   0.024168   0.000000
# Chi-squared of fit:     0.11 DOF:     24 RMS:  0.02
# Min/Max residuals:    -0.03    0.03
# Exact a, adot, b, bdot, g, gdot:
  1.590121E-05  2.462482E-02 -4.085194E-07 -7.309836E-04  2.441463E-02  6.450579E-04
# Covariance matrix:
  4.8217E-13  1.9196E-12  3.5761E-14 -4.8242E-13  2.2238E-12  3.3374E-10
  1.9196E-12  2.1204E-11  4.0024E-13 -5.4678E-12  2.1861E-11  3.7501E-09
  3.5761E-14  4.0024E-13  1.9598E-13 -2.5966E-13  4.1525E-13  7.3298E-11
 -4.8242E-13 -5.4678E-12 -2.5966E-13  1.7318E-12 -5.6688E-12 -1.0039E-09
  2.2238E-12  2.1861E-11  4.1525E-13 -5.6688E-12  2.2865E-11  3.8899E-09
  3.3374E-10  3.7501E-09  7.3298E-11 -1.0039E-09  3.8899E-09  6.8735E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.139672  -72.532000    0.374922    0.018475   -0.939435  2459382.936851
# Heliocentric elements and errors
Epoch:              2459380.5000  =  2021/06/15
Mean Anomaly:            9.11045 +/-    19.191
Argument of Peri:      135.62739 +/-    23.073
Long of Asc Node:      140.39581 +/-     0.026
Inclination:             2.02135 +/-     0.001
Eccentricity:         0.08866085 +/-    0.0073
Semi-Major Axis:     45.91622239 +/-    0.0694
Time of Perihelion: 2456504.5248 +/-    6058.3
Perihelion:          41.84525097 +/-    0.3422
Aphelion:            49.98719380 +/-    0.3447
Period (y)              311.1411 +/-      0.71
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           12.22510060 +/-    0.0024
Ecliptic Y          -40.07603207 +/-    0.0077
Ecliptic Z            0.81472184 +/-    0.0002
Ecliptic XDOT         0.00266179 +/-    0.0000
Ecliptic YDOT         0.00076555 +/-    0.0001
Ecliptic ZDOT        -0.00008071 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.90710205 +/-    0.0074
Geocenter to KBO     40.95905327 +/-    0.0080
# Hcoef:  8.69

The following table shows the complete astrometric record for 21MA23. 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 (21MA23) followed by the observatory code and reference code for the source of the astrometry.

2021 06  17.43605  19 15 05.668  -21 10 06.18  24.9r 21MA23    266  C~6Ip5      
2021 06  17.50053  19 15 05.363  -21 10 06.71  24.9r 21MA23    266  C~6Ip5      
2021 06  17.57953  19 15 04.989  -21 10 07.35  24.9r 21MA23    266  C~6Ip5      
2021 07  05.35106  19 13 38.135  -21 12 43.46  24.6r 21MA23    266  C~6Ip5      
2021 07  05.43951  19 13 37.681  -21 12 44.29  24.6r 21MA23    266  C~6Ip5      
2021 07  05.52517  19 13 37.242  -21 12 45.07  24.6r 21MA23    266  C~6Ip5      
2021 09  06.23258  19 09 18.614  -21 21 21.50  25.0r 21MA23    266  C~6Ip5      
2021 09  06.31281  19 09 18.432  -21 21 21.94  25.0r 21MA23    266  C~6Ip5      
2021 09  06.39352  19 09 18.250  -21 21 22.36  25.0r 21MA23    266  C~6Ip5      
2022 10  20.21696  19 15 09.267  -21 15 06.07        21MA23    266  C~8ebo      
2022 10  20.26058  19 15 09.352  -21 15 05.99        21MA23    266  C~8ebo      
2022 10  20.29842  19 15 09.426  -21 15 05.91        21MA23    266  C~8ebo      
2022 10  21.20926  19 15 11.315  -21 15 04.26        21MA23    266  C~8ebo      
2022 10  21.25420  19 15 11.406  -21 15 04.16        21MA23    266  C~8ebo      
2022 10  21.29846  19 15 11.497  -21 15 04.07        21MA23    266  C~8ebo      

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    -0.01
     2   0.0002     -4.30     0.01       0.02    -0.01
     3   0.0004     -9.57    -0.00       0.06    -0.02
     4   0.0490  -1234.29    -0.01      -0.65    -0.01
     5   0.0493  -1240.70    -0.01      -0.68    -0.01
     6   0.0495  -1246.88     0.00      -0.68    -0.01
     7   0.2212  -4898.62     0.00     -70.96     0.03
     8   0.2214  -4901.20     0.00     -71.10     0.02
     9   0.2216  -4903.77    -0.00     -71.21     0.03
    10   1.3409     11.50     0.00    -303.87    -0.02
    11   1.3411     12.69     0.01    -303.94    -0.03
    12   1.3412     13.73     0.01    -303.99    -0.03
    13   1.3437     40.13     0.00    -305.74     0.02
    14   1.3438     41.40    -0.01    -305.80     0.03
    15   1.3439     42.68    -0.01    -305.88     0.02

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.

21MA23    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.343    46.413    45.033
ecceobj         0.079     0.141     0.089
incobj          2.022     2.025     2.019
qmin           41.316    39.383    40.507
qmax           50.107    54.380    50.305
amean          45.596    46.697    45.260
amin           45.225    46.290    44.897
amax           45.985    47.150    45.648
emean           0.077     0.140     0.088
emin            0.064     0.127     0.074
emax            0.090     0.154     0.102
imean           1.603     1.568     1.700
imin            1.088     1.084     1.089
imax            2.023     1.996     2.269
excite_mean     0.082     0.143     0.093
fracstop        1.000     1.000     1.000
cjmean          3.113     3.110     3.106

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       166.6     162.7     181.8
kozaiamp        179.9     180.0     180.0