Orbit Fit and Astrometric record for 20KS55

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: 20KS55    
# Created Tue Apr  1 01:11:20 2025
# Orbit generated from Bernstein formalism
# Fitting     21 observations of     21
# Arc:  79.98d
# First observation: 2020/05/26
#  Last observation: 2020/08/14
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.015668   0.000007   0.010817   0.022853   0.000000
# Chi-squared of fit:     1.33 DOF:     36 RMS:  0.04
# Min/Max residuals:    -0.08    0.07
# Exact a, adot, b, bdot, g, gdot:
  1.502442E-05  2.336378E-02  7.392520E-06  1.081331E-02  2.419138E-02  7.131673E-03
# Covariance matrix:
  2.1203E-13 -1.6166E-11  4.4640E-15  2.6951E-13 -2.2002E-12  1.0238E-10
 -1.6166E-11  7.1369E-08 -6.2575E-11  4.0592E-10  1.3222E-08  1.8949E-07
  4.4640E-15 -6.2575E-11  1.9418E-13 -1.1991E-12 -1.1677E-11 -1.8445E-10
  2.6951E-13  4.0592E-10 -1.1991E-12  1.3411E-11  7.8485E-11  1.8021E-09
 -2.2002E-12  1.3222E-08 -1.1677E-11  7.8485E-11  2.4558E-09  3.6423E-08
  1.0238E-10  1.8949E-07 -1.8445E-10  1.8021E-09  3.6423E-08  7.9369E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.741514  -73.974366    0.663025    0.036246   -0.759603  2458995.943811
# Heliocentric elements and errors
Epoch:              2458990.5000  =  2020/05/21
Mean Anomaly:           24.22811 +/-     1.895
Argument of Peri:      311.54931 +/-     2.274
Long of Asc Node:      279.30130 +/-     0.069
Inclination:            24.85140 +/-     0.251
Eccentricity:         0.38954822 +/-    0.0432
Semi-Major Axis:     60.77218644 +/-    3.0451
Time of Perihelion: 2447344.6085 +/-     252.6
Perihelion:          37.09848910 +/-    3.2157
Aphelion:            84.44588377 +/-    4.9790
Period (y)              473.7678 +/-     35.61
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           10.97702649 +/-    0.0234
Ecliptic Y          -40.60595318 +/-    0.0813
Ecliptic Z            1.97753466 +/-    0.0041
Ecliptic XDOT         0.00275596 +/-    0.0000
Ecliptic YDOT         0.00001487 +/-    0.0001
Ecliptic ZDOT         0.00126076 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.10996542 +/-    0.0786
Geocenter to KBO     41.33704279 +/-    0.0847
# Hcoef:  9.70

The following table shows the complete astrometric record for 20KS55. 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 (20KS55) followed by the observatory code and reference code for the source of the astrometry.

2020 05  26.44301  19 08 08.965  -19 45 17.80  26.0r 20KS55    266  C~6c5c      
2020 05  26.50149  19 08 08.748  -19 45 17.65  26.0r 20KS55    266  C~6c5c      
2020 05  26.55599  19 08 08.545  -19 45 17.50  26.0r 20KS55    266  C~6c5c      
2020 05  29.44698  19 07 57.772  -19 45 09.93  25.7r 20KS55    266  C~6c5c      
2020 05  29.53371  19 07 57.434  -19 45 09.74  25.7r 20KS55    266  C~6c5c      
2020 05  29.61905  19 07 57.100  -19 45 09.53  25.7r 20KS55    266  C~6c5c      
2020 05  31.44139  19 07 50.033  -19 45 05.46  25.8r 20KS55    266  C~6c5c      
2020 05  31.52961  19 07 49.678  -19 45 05.29  25.8r 20KS55    266  C~6c5c      
2020 05  31.61814  19 07 49.321  -19 45 05.10  25.8r 20KS55    266  C~6c5c      
2020 06  21.45390  19 06 16.221  -19 44 51.39  25.9r 20KS55    266  C~6c5c      
2020 06  21.53376  19 06 15.825  -19 44 51.44  25.9r 20KS55    266  C~6c5c      
2020 06  21.61261  19 06 15.434  -19 44 51.46  25.9r 20KS55    266  C~6c5c      
2020 06  24.43648  19 06 01.568  -19 44 53.44  25.9r 20KS55    266  C~6c5c      
2020 06  24.52739  19 06 01.110  -19 44 53.52  25.9r 20KS55    266  C~6c5c      
2020 06  24.61708  19 06 00.660  -19 44 53.58  25.9r 20KS55    266  C~6c5c      
2020 08  12.26680  19 02 08.159  -19 46 36.96  26.4r 20KS55    266  C~6c5c      
2020 08  12.34843  19 02 07.831  -19 46 37.15  26.4r 20KS55    266  C~6c5c      
2020 08  12.42950  19 02 07.506  -19 46 37.33  26.4r 20KS55    266  C~6c5c      
2020 08  14.24286  19 02 00.501  -19 46 41.57  25.5r 20KS55    266  C~6c5c      
2020 08  14.33285  19 02 00.151  -19 46 41.78  25.5r 20KS55    266  C~6c5c      
2020 08  14.42134  19 01 59.806  -19 46 41.97  25.5r 20KS55    266  C~6c5c      

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    -0.07
     2   0.0002     -3.03     0.05       0.51    -0.07
     3   0.0003     -5.85     0.04       0.99    -0.07
     4   0.0082   -156.02    -0.05      26.23     0.02
     5   0.0085   -160.74    -0.04      26.98     0.01
     6   0.0087   -165.40    -0.04      27.73     0.01
     7   0.0137   -264.01    -0.02      43.38     0.06
     8   0.0139   -268.97    -0.01      44.13     0.06
     9   0.0142   -273.96    -0.01      44.91     0.06
    10   0.0712  -1578.04     0.02     209.76    -0.04
    11   0.0714  -1583.60     0.03     210.35    -0.05
    12   0.0716  -1589.08     0.02     210.96    -0.04
    13   0.0794  -1783.81    -0.01     231.26     0.05
    14   0.0796  -1790.24    -0.01     231.91     0.05
    15   0.0799  -1796.56    -0.01     232.58     0.04
    16   0.2131  -5070.92     0.01     493.27     0.07
    17   0.2133  -5075.55     0.01     493.58     0.07
    18   0.2135  -5080.13     0.02     493.90     0.06
    19   0.2185  -5178.95    -0.02     500.34    -0.07
    20   0.2187  -5183.89    -0.01     500.67    -0.07
    21   0.2190  -5188.75    -0.02     501.00    -0.08

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.

20KS55    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        59.592    72.321    51.942
ecceobj         0.379     0.510     0.256
incobj         24.957    24.198    25.803
qmin           35.920    34.060    37.688
qmax           85.416   114.251    67.512
amean          60.088    73.129    52.318
amin           59.405    72.099    51.841
amax           60.979    74.563    52.925
emean           0.381     0.514     0.260
emin            0.364     0.496     0.244
emax            0.401     0.534     0.277
imean          26.602    25.763    27.376
imin           25.983    24.755    26.970
imax           27.251    26.874    27.824
excite_mean     0.588     0.674     0.528
fracstop        1.000     1.000     1.000
cjmean          2.835     2.818     2.836

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       183.3     174.3     165.5
kozaiamp        180.0     180.0     179.9