Orbit Fit and Astrometric record for 17BQ237

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: 17BQ237   
# Created Thu Oct 31 01:10:31 2024
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   1.95y
# First observation: 2015/03/22
#  Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000070   0.025780  -0.000025   0.005493   0.026202   0.000000
# Chi-squared of fit:     6.73 DOF:     30 RMS:  0.11
# Min/Max residuals:    -0.27    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.570618E-05  2.557589E-02  3.387076E-06  5.438979E-03  2.590293E-02 -1.757456E-03
# Covariance matrix:
  7.2560E-13 -1.0942E-12  2.8314E-14 -1.5660E-13 -5.9946E-13 -1.4034E-11
 -1.0942E-12  5.3984E-12 -2.0386E-13  1.1000E-12  4.5154E-12  9.7778E-11
  2.8314E-14 -2.0386E-13  6.1905E-13 -3.7733E-13 -2.0834E-13 -4.0000E-12
 -1.5660E-13  1.1000E-12 -3.7733E-13  4.4822E-13  1.0515E-12  2.1209E-11
 -5.9946E-13  4.5154E-12 -2.0834E-13  1.0515E-12  5.1401E-12  9.1307E-11
 -1.4034E-11  9.7778E-11 -4.0000E-12  2.1209E-11  9.1307E-11  1.8741E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -13.205957  142.729338   -0.618480   -0.177424   -0.756676  2457103.880760
# Heliocentric elements and errors
Epoch:              2457100.5000  =  2015/03/19
Mean Anomaly:          299.67738 +/-     0.435
Argument of Peri:       18.74478 +/-     0.589
Long of Asc Node:      189.69939 +/-     0.002
Inclination:            17.70834 +/-     0.001
Eccentricity:         0.05695441 +/-    0.0016
Semi-Major Axis:     40.40709136 +/-    0.0168
Time of Perihelion: 2472820.8615 +/-     112.9
Perihelion:          38.10572925 +/-    0.0668
Aphelion:            42.70845347 +/-    0.0673
Period (y)              256.8589 +/-      0.16
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -30.90587967 +/-    0.0026
Ecliptic Y           22.73903726 +/-    0.0020
Ecliptic Z           -8.81940610 +/-    0.0008
Ecliptic XDOT        -0.00160104 +/-    0.0000
Ecliptic YDOT        -0.00218701 +/-    0.0000
Ecliptic ZDOT         0.00060220 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.37028242 +/-    0.0024
Geocenter to KBO     38.60566954 +/-    0.0034
# Hcoef:  8.22

The following table shows the complete astrometric record for 17BQ237. 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 (17BQ237) followed by the observatory code and reference code for the source of the astrometry.

2015 03  22.379982 09 23 12.77   +01 25 39.7         17BQ237   T09  C~83Er      
2015 03  22.456321 09 23 12.51   +01 25 42.3         17BQ237   T09  C~83Er      
2016 04  04.246919 09 28 31.04   +01 22 57.5         17BQ237   T09  C~83Er      
2016 04  04.257515 09 28 31.01   +01 22 57.8         17BQ237   T09  C~83Er      
2017 01  21.37737  09 39 43.42   +00 36 13.6   23.5z 17BQ237   T09  C~83Er      
2017 01  21.38540  09 39 43.39   +00 36 13.6   23.8z 17BQ237   T09  C~83Er      
2017 01  21.41223  09 39 43.25   +00 36 14.3   24.0z 17BQ237   T09  C~83Er      
2017 01  28.39557  09 39 10.87   +00 38 32.5   24.6g 17BQ237   T09  C~83Er      
2017 01  28.41673  09 39 10.74   +00 38 33.0   24.7g 17BQ237   T09  C~83Er      
2017 01  28.43325  09 39 10.66   +00 38 33.4   25.1g 17BQ237   T09  C~83Er      
2017 01  28.45922  09 39 10.56   +00 38 33.7   25.0g 17BQ237   T09  C~83Er      
2017 03  04.37777  09 36 22.32   +00 55 10.4   23.9i 17BQ237   T09  C~83Er      
2017 03  04.38044  09 36 22.29   +00 55 10.2   24.1i 17BQ237   T09  C~83Er      
2017 03  04.38579  09 36 22.28   +00 55 10.6   23.6i 17BQ237   T09  C~83Er      
2017 03  04.38848  09 36 22.26   +00 55 10.7   23.8i 17BQ237   T09  C~83Er      
2017 03  04.39116  09 36 22.25   +00 55 10.7   23.7i 17BQ237   T09  C~83Er      
2017 03  04.41073  09 36 22.17   +00 55 11.4   23.9i 17BQ237   T09  C~83Er      
2017 03  04.41351  09 36 22.15   +00 55 11.6   23.7i 17BQ237   T09  C~83Er      

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    -0.02       0.00    -0.01
     2   0.0002     -4.52     0.02       1.23     0.03
     3   1.0373   4578.83     0.02    1358.91     0.01
     4   1.0373   4578.31    -0.01    1359.05    -0.04
     5   1.8371  15057.71     0.06    1905.30     0.07
     6   1.8371  15057.28     0.20    1905.16    -0.03
     7   1.8372  15055.06    -0.11    1905.16     0.10
     8   1.8563  14548.02     0.16    1881.59     0.03
     9   1.8564  14546.00    -0.25    1881.44    -0.06
    10   1.8564  14544.73    -0.27    1881.44    -0.02
    11   1.8565  14543.20     0.18    1881.25    -0.15
    12   1.9521  11822.72     0.06    2023.83     0.13
    13   1.9521  11822.36    -0.10    2023.50    -0.23
    14   1.9521  11822.09     0.04    2023.83     0.05
    15   1.9521  11821.77    -0.07    2023.83     0.02
    16   1.9521  11821.63    -0.01    2023.78    -0.05
    17   1.9522  11820.26     0.12    2024.07     0.04
    18   1.9522  11819.91    -0.02    2024.16     0.11

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.

17BQ237    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        40.214    40.252    40.178
ecceobj         0.051     0.055     0.048
incobj         17.748    17.748    17.748
qmin           37.399    37.291    37.541
qmax           43.214    43.386    42.966
amean          40.201    40.248    40.164
amin           39.895    39.935    39.842
amax           40.522    40.576    40.475
emean           0.051     0.055     0.047
emin            0.037     0.041     0.031
emax            0.067     0.070     0.062
imean          18.344    18.337    18.350
imin           17.450    17.449    17.466
imax           19.108    19.107    19.125
excite_mean     0.319     0.319     0.318
fracstop        1.000     1.000     1.000
cjmean          2.939     2.939     2.939

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       178.0     179.3     176.9
kozaiamp        180.0     180.0     180.0