Orbit Fit and Astrometric record for 17BS236

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: 17BS236   
# Created Thu Oct 31 01:10:31 2024
# Orbit generated from Bernstein formalism
# Fitting     29 observations of     29
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000040   0.021775   0.000002  -0.009512   0.023951   0.000000
# Chi-squared of fit:    10.15 DOF:     52 RMS:  0.10
# Min/Max residuals:    -0.28    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.381170E-05  2.188354E-02 -6.565451E-06 -9.626887E-03  2.437930E-02  4.064629E-03
# Covariance matrix:
  1.9667E-13  7.4330E-13  2.2373E-14 -3.4241E-13  5.3890E-13  3.9022E-11
  7.4330E-13  1.0702E-10  1.9887E-12 -3.2652E-11  3.6970E-11  3.7100E-09
  2.2373E-14  1.9887E-12  1.6469E-13 -7.7596E-13  7.0925E-13  6.9835E-11
 -3.4241E-13 -3.2652E-11 -7.7596E-13  1.0408E-11 -1.1554E-11 -1.1435E-09
  5.3890E-13  3.6970E-11  7.0925E-13 -1.1554E-11  1.3633E-11  1.3132E-09
  3.9022E-11  3.7100E-09  6.9835E-11 -1.1435E-09  1.3132E-09  1.2995E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.591305 -174.574619   -0.127464    0.044782   -0.986406  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           61.47568 +/-     0.762
Argument of Peri:       92.37939 +/-     0.629
Long of Asc Node:       11.34534 +/-     0.001
Inclination:            23.82343 +/-     0.003
Eccentricity:         0.17990727 +/-    0.0153
Semi-Major Axis:     44.58925646 +/-    0.2635
Time of Perihelion: 2438909.1022 +/-     160.7
Perihelion:          36.56732519 +/-    0.7169
Aphelion:            52.61118774 +/-    0.7509
Period (y)              297.7512 +/-      2.64
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.76756837 +/-    0.0062
Ecliptic Y           -4.09716076 +/-    0.0006
Ecliptic Z            1.85425272 +/-    0.0003
Ecliptic XDOT        -0.00027015 +/-    0.0000
Ecliptic YDOT        -0.00250128 +/-    0.0000
Ecliptic ZDOT        -0.00105937 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.00898412 +/-    0.0061
Geocenter to KBO     41.01840322 +/-    0.0062
# Hcoef:  7.68

The following table shows the complete astrometric record for 17BS236. 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 (17BS236) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 24 01.59   +00 13 26.4         17BS236   T09  C~83Eq      
2016 04  02.525980 12 24 00.96   +00 13 29.6         17BS236   T09  C~83Eq      
2016 04  04.34883  12 23 52.49   +00 14 12.5   24.3g 17BS236   T09  C~89UT      
2016 04  04.36800  12 23 52.40   +00 14 13.0   24.7g 17BS236   T09  C~89UT      
2016 04  04.37012  12 23 52.39   +00 14 13.0   24.5g 17BS236   T09  C~89UT      
2016 04  04.38940  12 23 52.30   +00 14 13.6   24.8g 17BS236   T09  C~89UT      
2016 04  04.41508  12 23 52.19   +00 14 14.1   24.4g 17BS236   T09  C~89UT      
2016 04  04.41948  12 23 52.15   +00 14 14.1   24.3g 17BS236   T09  C~89UT      
2016 06  04.25539  12 20 29.23   +00 27 42.8   23.9z 17BS236   T09  C~8COq      
2016 06  04.27307  12 20 29.23   +00 27 42.4   24.0z 17BS236   T09  C~8COq      
2016 06  04.28926  12 20 29.18   +00 27 42.4   23.7z 17BS236   T09  C~8COq      
2016 06  04.34327  12 20 29.13   +00 27 42.6   23.7z 17BS236   T09  C~8COq      
2016 06  05.311488 12 20 27.88   +00 27 41.5         17BS236   T09  C~83Eq      
2016 06  05.356114 12 20 27.82   +00 27 41.4         17BS236   T09  C~83Eq      
2017 01  23.61828  12 31 59.74   -01 08 59.2   23.7i 17BS236   T09  C~81Bp      
2017 01  23.64653  12 31 59.68   -01 08 58.9   23.9i 17BS236   T09  C~81Bp      
2017 01  23.65191  12 31 59.68   -01 08 58.9   23.7i 17BS236   T09  C~81Bp      
2017 01  28.59808  12 31 50.73   -01 08 15.0   23.5z 17BS236   T09  C~81Bp      
2017 01  28.61691  12 31 50.70   -01 08 14.7   23.4z 17BS236   T09  C~81Bp      
2017 01  28.61959  12 31 50.68   -01 08 14.7   23.5z 17BS236   T09  C~81Bp      
2017 01  28.64259  12 31 50.64   -01 08 14.3   23.7z 17BS236   T09  C~81Bp      
2017 01  28.64799  12 31 50.63   -01 08 14.5   23.4z 17BS236   T09  C~81Bp      
2017 01  28.65336  12 31 50.62   -01 08 14.5   23.8z 17BS236   T09  C~81Bp      
2017 02  02.60942  12 31 39.62   -01 07 17.9   23.7i 17BS236   T09  C~81Bp      
2017 02  02.62764  12 31 39.59   -01 07 17.9   23.6i 17BS236   T09  C~81Bp      
2017 02  02.64454  12 31 39.53   -01 07 17.7   23.5i 17BS236   T09  C~81Bp      
2017 02  23.52167  12 30 33.87   -01 01 27.5   23.7r 17BS236   T09  C~81Bp      
2017 02  23.56346  12 30 33.70   -01 01 26.7   24.1r 17BS236   T09  C~81Bp      
2017 02  23.59748  12 30 33.57   -01 01 26.0   24.3r 17BS236   T09  C~81Bp      

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     0.08       0.00     0.07
     2   0.0004     -9.94     0.04      -0.80     0.11
     3   0.0054   -143.60    -0.04     -11.72    -0.05
     4   0.0054   -145.03    -0.05     -11.80     0.00
     5   0.0054   -145.17    -0.03     -11.86    -0.04
     6   0.0055   -146.65    -0.07     -11.84     0.10
     7   0.0055   -148.36     0.12     -12.03     0.07
     8   0.0055   -148.91    -0.10     -12.27    -0.14
     9   0.1721  -3264.37    -0.26    -474.91     0.07
    10   0.1722  -3264.22     0.23    -475.27    -0.13
    11   0.1722  -3264.90    -0.14    -475.57    -0.28
    12   0.1723  -3265.67     0.12    -475.68     0.10
    13   0.1750  -3282.46     0.06    -484.12     0.07
    14   0.1751  -3283.25     0.06    -484.57     0.03
    15   0.8110   8548.97     0.10   -1702.89    -0.06
    16   0.8111   8548.02    -0.11   -1702.97    -0.06
    17   0.8111   8548.02     0.03   -1702.97    -0.04
    18   0.8247   8407.14    -0.02   -1715.76    -0.08
    19   0.8247   8406.61     0.07   -1715.66     0.08
    20   0.8247   8406.33    -0.12   -1715.78    -0.03
    21   0.8248   8405.62    -0.07   -1715.65     0.17
    22   0.8248   8405.56     0.05   -1715.89    -0.05
    23   0.8248   8405.43     0.09   -1715.95    -0.09
    24   0.8384   8231.24    -0.09   -1729.24     0.22
    25   0.8384   8230.83     0.22   -1729.42     0.10
    26   0.8385   8229.92    -0.02   -1729.59    -0.02
    27   0.8956   7185.51     0.00   -1797.62     0.03
    28   0.8957   7182.85    -0.09   -1797.89    -0.07
    29   0.8958   7180.78    -0.06   -1798.02    -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.

17BS236    quality flag:2

Type:       SCATEXTD  SCATNEAR  SCATEXTD

axisobj        44.122    45.281    43.261
ecceobj         0.175     0.228     0.121
incobj         23.941    23.929    23.953
qmin           36.047    34.403    37.614
qmax           52.898    57.015    49.519
amean          44.296    45.460    43.419
amin           43.902    45.023    43.072
amax           44.720    46.027    43.800
emean           0.168     0.219     0.116
emin            0.152     0.197     0.102
emax            0.185     0.241     0.131
imean          24.035    24.161    23.963
imin           23.519    23.414    23.544
imax           24.398    24.712    24.307
excite_mean     0.441     0.464     0.422
fracstop        1.000     1.000     1.000
cjmean          2.863     2.849     2.873

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       175.6     174.4     175.7
kozaiamp        179.9     180.0     180.0