Orbit Fit and Astrometric record for 15SP20

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: 15SP20    
# Created Wed Dec 25 02:10:26 2024
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     30 observations of     30
# Arc:  18.24y
# First observation: 2001/06/26
#  Last observation: 2019/09/24
# Chi-squared of fit:    47.71 DOF:     54 RMS:  0.22
# Min/Max residuals:    -0.59    0.54
# Exact a, adot, b, bdot, g, gdot:
  1.509552E-05  2.094347E-02 -8.047944E-07 -8.881162E-04  2.258364E-02  2.687040E-03
# Covariance matrix:
  7.3317E-13 -9.9511E-14 -2.3599E-15  2.1913E-15 -6.0918E-14 -1.5871E-13
 -9.9511E-14  5.4956E-14  2.3698E-15 -2.1922E-15  5.2064E-14  1.5882E-13
 -2.3599E-15  2.3698E-15  6.7999E-13 -4.7414E-14  1.0808E-15  7.7400E-15
  2.1913E-15 -2.1922E-15 -4.7414E-14  3.6426E-15 -1.2382E-15 -7.0840E-15
 -6.0918E-14  5.2064E-14  1.0808E-15 -1.2382E-15  2.8128E-13  8.8214E-14
 -1.5871E-13  1.5882E-13  7.7400E-15 -7.0840E-15  8.8214E-14  5.1371E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.904939  -42.741077    0.690669   -0.025179   -0.752462  2452086.994114
# Heliocentric elements and errors
Epoch:              2452086.5000  =  2001/06/26
Mean Anomaly:           86.36503 +/-     0.046
Argument of Peri:      118.39054 +/-     0.034
Long of Asc Node:       99.14350 +/-     0.003
Inclination:             3.09273 +/-     0.000
Eccentricity:         0.10947015 +/-    0.0000
Semi-Major Axis:     44.81086930 +/-    0.0039
Time of Perihelion: 2425801.4441 +/-      14.3
Perihelion:          39.90541677 +/-    0.0037
Aphelion:            49.71632182 +/-    0.0045
Period (y)              299.9738 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           32.59020472 +/-    0.0008
Ecliptic Y          -31.04781517 +/-    0.0007
Ecliptic Z           -1.47192647 +/-    0.0001
Ecliptic XDOT         0.00195119 +/-    0.0000
Ecliptic YDOT         0.00164815 +/-    0.0000
Ecliptic ZDOT        -0.00011824 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.03607905 +/-    0.0007
Geocenter to KBO     44.27978915 +/-    0.0010
# Hcoef:  6.11

The following table shows the complete astrometric record for 15SP20. 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 (15SP20) followed by the observatory code and reference code for the source of the astrometry.

2001 06  26.493371 21 21 15.12   -17 28 35.5         15SP20    568  C~5Xn9      
2001 06  26.520559 21 21 15.05   -17 28 36.0         15SP20    568  C~5Xn9      
2013 08  02.402967 22 14 49.40   -13 30 15.4   23.3r 15SP20    568  C~5Xn9      
2013 08  02.408807 22 14 49.39   -13 30 15.5   23.4r 15SP20    568  C~5Xn9      
2014 05  28.604941 22 21 23.60   -12 52 19.8         15SP20    568  C~5Xn9      
2014 05  28.607101 22 21 23.58   -12 52 19.8         15SP20    568  C~5Xn9      
2015 09  17.87223  22 20 30.65   -13 03 20.1   22.5R 15SP20    Z79  C~1afZ      
2015 09  17.92713  22 20 30.43   -13 03 20.9   22.4R 15SP20    Z79  C~1afZ      
2015 09  19.90404  22 20 22.86   -13 04 01.7   22.4R 15SP20    Z79  C~1afZ      
2015 09  19.95272  22 20 22.68   -13 04 02.5   22.5R 15SP20    Z79  C~1afZ      
2015 09  19.95676  22 20 22.67   -13 04 02.4   22.5R 15SP20    Z79  C~1afZ      
2015 09  19.96080  22 20 22.65   -13 04 03.0   22.4R 15SP20    Z79  C~1afZ      
2015 09  20.00385  22 20 22.46   -13 04 03.7   22.5R 15SP20    Z79  C~1afZ      
2015 09  20.00789  22 20 22.47   -13 04 03.9   22.5R 15SP20    Z79  C~1afZ      
2015 09  20.01192  22 20 22.45   -13 04 03.8   22.4R 15SP20    Z79  C~1afZ      
2015 09  20.85060  22 20 19.32   -13 04 20.4   22.2R 15SP20    Z79  C~1afZ      
2015 09  20.85464  22 20 19.30   -13 04 20.6   22.2R 15SP20    Z79  C~1afZ      
2015 09  20.85867  22 20 19.28   -13 04 20.5   22.3R 15SP20    Z79  C~1afZ      
2015 10  12.95642  22 19 07.27   -13 10 27.2   22.5R 15SP20    J13  C~1afZ      
2015 10  12.96184  22 19 07.28   -13 10 27.2   22.3R 15SP20    J13  C~1afZ      
2015 10  12.96726  22 19 07.25   -13 10 27.3   22.5R 15SP20    J13  C~1afZ      
2015 10  12.97268  22 19 07.23   -13 10 27.2   22.5R 15SP20    J13  C~1afZ      
2015 10  14.88237  22 19 02.34   -13 10 50.6   22.4R 15SP20    J13  C~1afZ      
2015 10  14.88721  22 19 02.30   -13 10 50.8   22.3R 15SP20    J13  C~1afZ      
2015 10  14.89205  22 19 02.28   -13 10 51.1   22.4R 15SP20    J13  C~1afZ      
2016 08  30.05458  22 26 06.46   -12 33 51.9   22.5V 15SP20    J13  C~1xhd      
2016 08  30.06001  22 26 06.45   -12 33 52.1   22.5V 15SP20    J13  C~1xhd      
2016 08  31.04868  22 26 02.28   -12 34 16.4   22.6V 15SP20    J13  C~1xhd      
2016 08  31.05411  22 26 02.27   -12 34 16.3   22.4V 15SP20    J13  C~1xhd      
2019 09  24.208276 22 37 25.85   -11 34 11.8   23.6V 15SP20    W84  C~5Xn9      

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    -0.10       0.00     0.01
     2   0.0001      0.00     0.12       0.00    -0.04
     3  12.1011      0.00    -0.04       0.00    -0.30
     4  12.1011      0.00     0.16       0.00    -0.27
     5  12.9202      0.00     0.35       0.00    -0.24
     6  12.9202      0.00     0.04       0.00    -0.24
     7  14.2269      0.00    -0.07       0.00    -0.15
     8  14.2271      0.00    -0.14       0.00     0.19
     9  14.2325      0.00    -0.19       0.00    -0.01
    10  14.2326      0.00    -0.07       0.00     0.18
    11  14.2326      0.00     0.01       0.00     0.36
    12  14.2326      0.00    -0.06       0.00    -0.16
    13  14.2327      0.00    -0.42       0.00     0.01
    14  14.2328      0.00    -0.03       0.00    -0.11
    15  14.2328      0.00    -0.10       0.00     0.08
    16  14.2351      0.00     0.30       0.00     0.37
    17  14.2351      0.00     0.23       0.00     0.25
    18  14.2351      0.00     0.16       0.00     0.43
    19  14.2956      0.00    -0.31       0.00     0.02
    20  14.2956      0.00     0.06       0.00     0.09
    21  14.2956      0.00    -0.17       0.00     0.06
    22  14.2956      0.00    -0.25       0.00     0.22
    23  14.3009      0.00     0.54       0.00     0.16
    24  14.3009      0.00     0.13       0.00     0.02
    25  14.3009      0.00     0.01       0.00    -0.23
    26  15.1774      0.00     0.01       0.00     0.22
    27  15.1775      0.00     0.21       0.00     0.15
    28  15.1802      0.00    -0.32       0.00    -0.33
    29  15.1802      0.00    -0.12       0.00    -0.09
    30  18.2443      0.00     0.28       0.00    -0.59

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.

15SP20    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.016    45.016    45.016
ecceobj         0.109     0.109     0.109
incobj          3.091     3.091     3.091
qmin           39.399    39.386    39.438
qmax           50.915    50.907    50.857
amean          45.000    45.000    45.000
amin           44.636    44.635    44.642
amax           45.411    45.400    45.407
emean           0.106     0.106     0.106
emin            0.092     0.091     0.092
emax            0.121     0.122     0.121
imean           1.294     1.294     1.294
imin            0.560     0.562     0.560
imax            1.921     1.920     1.921
excite_mean     0.109     0.109     0.109
fracstop        1.000     1.000     1.000
cjmean          3.099     3.099     3.099

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       211.1     211.2     211.1
kozaiamp        179.9     180.0     180.0