Orbit Fit and Astrometric record for 17BK233

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: 17BK233   
# Created Fri Nov  1 01:10:30 2024
# Orbit generated from Bernstein formalism
# Fitting     15 observations of     15
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000042   0.017892  -0.000002   0.001808   0.020336   0.000000
# Chi-squared of fit:     4.00 DOF:     24 RMS:  0.09
# Min/Max residuals:    -0.20    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.397277E-05  1.778758E-02  1.439529E-06  1.820549E-03  2.062301E-02 -2.012795E-03
# Covariance matrix:
  7.3657E-13  3.6728E-12  2.8066E-15  2.9009E-13  2.2993E-12  2.1077E-10
  3.6728E-12  3.3911E-10 -2.6260E-13  1.9500E-11  1.2386E-10  1.4350E-08
  2.8066E-15 -2.6260E-13  4.5495E-13 -5.6977E-13 -7.6200E-14 -1.0307E-11
  2.9009E-13  1.9500E-11 -5.6977E-13  2.0028E-12  7.2922E-12  8.3363E-10
  2.2993E-12  1.2386E-10 -7.6200E-14  7.2922E-12  4.7814E-11  5.3575E-09
  2.1077E-10  1.4350E-08 -1.0307E-11  8.3363E-10  5.3575E-09  6.1310E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.915927 -173.980187   -0.117213    0.050435   -0.987404  2457480.894196
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          255.88572 +/-     9.615
Argument of Peri:      142.72654 +/-     8.746
Long of Asc Node:      160.06104 +/-     0.012
Inclination:             6.47365 +/-     0.003
Eccentricity:         0.11616154 +/-    0.0374
Semi-Major Axis:     47.55958909 +/-    0.3941
Time of Perihelion: 2492127.3177 +/-    3170.5
Perihelion:          42.03499377 +/-    1.8134
Aphelion:            53.08418441 +/-    1.8332
Period (y)              327.9936 +/-      4.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -49.13435161 +/-    0.0161
Ecliptic Y           -5.30160038 +/-    0.0017
Ecliptic Z            2.46678283 +/-    0.0008
Ecliptic XDOT         0.00052538 +/-    0.0001
Ecliptic YDOT        -0.00232611 +/-    0.0000
Ecliptic ZDOT         0.00022779 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   49.48107206 +/-    0.0160
Geocenter to KBO     48.48953044 +/-    0.0163
# Hcoef:  7.63

The following table shows the complete astrometric record for 17BK233. 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 (17BK233) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.393407 12 26 43.29   +00 17 13.6         17BK233   T09  C~83Eq      
2016 04  02.444565 12 26 43.10   +00 17 14.9         17BK233   T09  C~83Eq      
2016 06  05.326381 12 23 47.57   +00 34 53.5         17BK233   T09  C~83Eq      
2016 06  05.358251 12 23 47.55   +00 34 53.5         17BK233   T09  C~83Eq      
2017 01  23.630400 12 34 04.97   -00 26 56.8         17BK233   T09  C~83Eq      
2017 01  28.60076  12 33 58.14   -00 25 49.2   24.6z 17BK233   T09  C~7zpa      
2017 01  28.62228  12 33 58.11   -00 25 49.2   23.9z 17BK233   T09  C~7zpa      
2017 01  28.64528  12 33 58.06   -00 25 48.7   24.3z 17BK233   T09  C~7zpa      
2017 01  28.64799  12 33 58.06   -00 25 48.5   24.4z 17BK233   T09  C~7zpa      
2017 02  02.61286  12 33 49.53   -00 24 30.9   24.9i 17BK233   T09  C~7zpa      
2017 02  02.61925  12 33 49.50   -00 24 30.7   24.5i 17BK233   T09  C~7zpa      
2017 02  02.63889  12 33 49.47   -00 24 30.4   24.2i 17BK233   T09  C~7zpa      
2017 02  02.64725  12 33 49.45   -00 24 30.2   24.4i 17BK233   T09  C~7zpa      
2017 02  23.535818 12 32 56.93   -00 17 29.0         17BK233   T09  C~83Eq      
2017 02  23.607996 12 32 56.70   -00 17 27.3         17BK233   T09  C~83Eq      

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    -0.07       0.00    -0.01
     2   0.0001     -3.13     0.06       0.07     0.05
     3   0.1750  -2840.19    -0.12     -69.10    -0.00
     4   0.1751  -2840.46     0.12     -69.22    -0.04
     5   0.8111   7136.03     0.21     186.79     0.04
     6   0.8247   7015.06    -0.07     208.36     0.06
     7   0.8247   7014.65     0.12     208.19    -0.20
     8   0.8248   7013.76    -0.12     208.35    -0.13
     9   0.8248   7013.68    -0.13     208.53     0.05
    10   0.8384   6865.31     0.16     229.20     0.03
    11   0.8384   6864.81    -0.12     229.21     0.01
    12   0.8385   6864.28     0.01     229.31     0.04
    13   0.8385   6863.92    -0.07     229.37     0.07
    14   0.8957   5972.92     0.04     304.61     0.01
    15   0.8959   5969.07    -0.02     304.80     0.02

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.

17BK233    quality flag:2

Type:      CLASSICAL  SCATNEAR CLASSICAL

axisobj        47.049    48.685    46.652
ecceobj         0.120     0.227     0.062
incobj          6.506     6.505     6.508
qmin           40.925    37.275    43.361
qmax           54.159    61.207    50.630
amean          47.335    48.990    46.896
amin           46.926    48.493    46.516
amax           47.803    49.513    47.295
emean           0.118     0.224     0.059
emin            0.104     0.212     0.047
emax            0.133     0.237     0.071
imean           6.005     6.103     5.917
imin            5.647     5.599     5.612
imax            6.433     6.613     6.247
excite_mean     0.158     0.248     0.119
fracstop        1.000     1.000     1.000
cjmean          3.112     3.086     3.120

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       183.4     187.0     183.6
kozaiamp        180.0     180.0     180.0