Orbit Fit and Astrometric record for 17BA237

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: 17BA237   
# Created Tue Apr  1 01:11:02 2025
# Orbit generated from Bernstein formalism
# Fitting     20 observations of     20
# Arc:   0.99y
# First observation: 2016/04/04
#  Last observation: 2017/03/30
Preliminary a, adot, b, bdot, g, gdot:
  -0.000024   0.021135  -0.000001   0.000847   0.022291   0.000000
# Chi-squared of fit:     6.73 DOF:     34 RMS:  0.10
# Min/Max residuals:    -0.31    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.496433E-05  2.105263E-02  4.649801E-07  8.537298E-04  2.266401E-02  6.595105E-04
# Covariance matrix:
  3.0658E-13  8.5633E-13  1.7799E-15  3.4019E-14  7.5621E-13  5.3159E-11
  8.5633E-13  3.7566E-11  3.5496E-14  9.9990E-13  2.0099E-11  1.6025E-09
  1.7799E-15  3.5496E-14  2.5957E-13 -2.9630E-13  2.7140E-14  1.7333E-12
  3.4019E-14  9.9990E-13 -2.9630E-13  5.0499E-13  5.7595E-13  4.4065E-11
  7.5621E-13  2.0099E-11  2.7140E-14  5.7595E-13  1.2424E-11  9.0711E-10
  5.3159E-11  1.6025E-09  1.7333E-12  4.4065E-11  9.0711E-10  7.0220E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.783893 -173.108450   -0.137473    0.065242   -0.984488  2457482.957879
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:           97.85323 +/-     4.345
Argument of Peri:      316.30152 +/-     4.244
Long of Asc Node:      129.03166 +/-     0.024
Inclination:             4.35988 +/-     0.001
Eccentricity:         0.03502841 +/-    0.0122
Semi-Major Axis:     44.84315700 +/-    0.0352
Time of Perihelion: 2427666.8343 +/-    1323.3
Perihelion:          43.27237261 +/-    0.5470
Aphelion:            46.41394139 +/-    0.5472
Period (y)              300.2980 +/-      0.35
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.67526042 +/-    0.0068
Ecliptic Y           -5.54035834 +/-    0.0008
Ecliptic Z            2.91186766 +/-    0.0005
Ecliptic XDOT         0.00023312 +/-    0.0000
Ecliptic YDOT        -0.00254052 +/-    0.0000
Ecliptic ZDOT         0.00010817 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.11156656 +/-    0.0067
Geocenter to KBO     44.12282280 +/-    0.0069
# Hcoef:  7.81

The following table shows the complete astrometric record for 17BA237. 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 (17BA237) followed by the observatory code and reference code for the source of the astrometry.

2016 04  04.45709  12 31 17.49   +00 44 25.5   25.4g 17BA237   T09  C~89UT      
2016 04  04.52379  12 31 17.21   +00 44 27.2   25.4g 17BA237   T09  C~89UT      
2016 04  04.55367  12 31 17.08   +00 44 28.0   25.7g 17BA237   T09  C~89UT      
2016 04  06.573767 12 31 08.70   +00 45 21.5         17BA237   T09  C~86uk      
2016 04  06.582209 12 31 08.67   +00 45 21.7         17BA237   T09  C~86uk      
2016 06  05.328496 12 28 11.55   +01 01 33.8         17BA237   T09  C~86uk      
2017 01  30.62344  12 39 26.50   -00 07 59.3   23.9z 17BA237   T09  C~81Bp      
2017 01  30.63419  12 39 26.48   -00 07 59.1   23.5z 17BA237   T09  C~81Bp      
2017 01  30.65979  12 39 26.44   -00 07 58.8   23.3z 17BA237   T09  C~81Bp      
2017 02  02.62200  12 39 21.04   -00 07 08.2   24.2i 17BA237   T09  C~81Bp      
2017 02  02.66749  12 39 20.94   -00 07 07.4   24.3i 17BA237   T09  C~81Bp      
2017 02  21.49546  12 38 32.55   -00 00 29.0   23.7z 17BA237   T09  C~81Bp      
2017 02  21.54193  12 38 32.40   -00 00 28.0   23.5z 17BA237   T09  C~81Bp      
2017 02  21.56347  12 38 32.32   -00 00 27.4   23.8z 17BA237   T09  C~81Bp      
2017 02  21.59307  12 38 32.23   -00 00 26.7   23.7z 17BA237   T09  C~81Bp      
2017 02  23.54142  12 38 25.98   +00 00 20.9   24.7r 17BA237   T09  C~85Iq      
2017 02  23.57615  12 38 25.86   +00 00 21.7   24.8r 17BA237   T09  C~85Iq      
2017 02  23.61010  12 38 25.75   +00 00 22.5   24.9r 17BA237   T09  C~85Iq      
2017 03  30.397410 12 36 10.88   +00 16 04.5         17BA237   T09  C~86uk      
2017 03  30.426996 12 36 10.78   +00 16 04.9         17BA237   T09  C~86uk      

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    -0.06       0.00     0.03
     2   0.0002     -4.53     0.01      -0.10    -0.03
     3   0.0003     -6.64    -0.05      -0.13    -0.05
     4   0.0058   -143.24     0.05      -0.62     0.02
     5   0.0058   -143.73     0.13      -0.61     0.03
     6   0.1694  -2968.40    -0.07    -156.39    -0.04
     7   0.8245   7984.68    -0.07       8.81     0.05
     8   0.8246   7984.33    -0.09       8.88     0.07
     9   0.8246   7983.66     0.04       8.91    -0.01
    10   0.8328   7889.12    -0.10      23.40     0.09
    11   0.8329   7887.42    -0.22      23.55     0.04
    12   0.8844   7062.13     0.12     102.78     0.14
    13   0.8846   7059.67     0.17     102.81     0.02
    14   0.8846   7058.33    -0.00     102.89     0.03
    15   0.8847   7056.81     0.08     103.00     0.05
    16   0.8900   6951.76     0.06     109.68    -0.04
    17   0.8901   6949.79     0.02     109.71    -0.12
    18   0.8902   6947.95     0.08     109.79    -0.13
    19   0.9855   4715.52    -0.31     175.80     0.04
    20   0.9855   4713.98     0.21     175.58    -0.18

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.

17BA237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.384    44.572    44.288
ecceobj         0.039     0.070     0.021
incobj          4.366     4.368     4.365
qmin           41.877    40.651    42.724
qmax           47.561    49.134    46.454
amean          44.600    44.783    44.510
amin           44.252    44.429    44.174
amax           44.976    45.164    44.860
emean           0.043     0.074     0.023
emin            0.029     0.060     0.007
emax            0.057     0.088     0.036
imean           3.200     3.214     3.189
imin            2.696     2.692     2.692
imax            3.749     3.784     3.740
excite_mean     0.071     0.093     0.060
fracstop        1.000     1.000     1.000
cjmean          3.103     3.101     3.103

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       174.4     173.8     176.3
kozaiamp        180.0     180.0     180.0