Orbit Fit and Astrometric record for 17BB245

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: 17BB245   
# Created Tue Apr  1 01:11:02 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     25 observations of     25
# Arc:  16.02y
# First observation: 2002/01/10
#  Last observation: 2018/01/17
# Chi-squared of fit:    11.87 DOF:     44 RMS:  0.12
# Min/Max residuals:    -0.35    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.859961E-05  3.275459E-02 -5.669316E-06 -1.123344E-02  2.758211E-02 -9.271739E-03
# Covariance matrix:
  2.9331E-13 -3.1608E-14 -9.3397E-16  4.3580E-15 -8.1897E-15 -1.9548E-14
 -3.1608E-14  6.6614E-14  4.7051E-15 -2.2188E-14  8.2202E-14  9.9457E-14
 -9.3397E-16  4.7051E-15  2.9099E-13 -2.0545E-14  5.1937E-15  7.1988E-15
  4.3580E-15 -2.2188E-14 -2.0545E-14  8.9793E-15 -2.6226E-14 -3.3898E-14
 -8.1897E-15  8.2202E-14  5.1937E-15 -2.6226E-14  3.9477E-13  1.1705E-13
 -1.9548E-14  9.9457E-14  7.1988E-15 -3.3898E-14  1.1705E-13  1.5196E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.579891  121.661539    0.196039   -0.009776   -0.958859  2452284.872070
# Heliocentric elements and errors
Epoch:              2452284.5000  =  2002/01/10
Mean Anomaly:          352.66555 +/-     0.002
Argument of Peri:      221.37210 +/-     0.002
Long of Asc Node:      299.70507 +/-     0.000
Inclination:            18.91969 +/-     0.000
Eccentricity:         0.63342415 +/-    0.0001
Semi-Major Axis:     92.48281698 +/-    0.2024
Time of Perihelion: 2458902.9352 +/-    1044.7
Perihelion:          33.90196767 +/-    0.0749
Aphelion:           151.06366629 +/-    0.3308
Period (y)              889.4054 +/-      2.92
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -19.36507304 +/-    0.0005
Ecliptic Y           31.78200240 +/-    0.0008
Ecliptic Z           -0.36714889 +/-    0.0000
Ecliptic XDOT        -0.00228694 +/-    0.0000
Ecliptic YDOT        -0.00249989 +/-    0.0000
Ecliptic ZDOT        -0.00110547 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.21896068 +/-    0.0007
Geocenter to KBO     36.25560358 +/-    0.0009
# Hcoef:  8.82

The following table shows the complete astrometric record for 17BB245. 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 (17BB245) followed by the observatory code and reference code for the source of the astrometry.

2002 01  10.371327 08 15 04.98   +19 13 28.2         17BB245   T09  C~89UU      
2002 01  10.395463 08 15 04.83   +19 13 28.6         17BB245   T09  C~89UU      
2002 01  10.417025 08 15 04.72   +19 13 29.0         17BB245   T09  C~89UU      
2002 01  11.532842 08 14 58.53   +19 13 41.3         17BB245   T09  C~89UU      
2002 01  11.557108 08 14 58.39   +19 13 41.6         17BB245   T09  C~89UU      
2016 01  09.601013 09 58 44.62   +01 37 14.3         17BB245   T09  C~89UU      
2016 01  09.645099 09 58 44.44   +01 37 14.4         17BB245   T09  C~89UU      
2017 01  23.448142 10 05 17.52   +00 13 58.5         17BB245   T09  C~89UU      
2017 01  28.51088  10 04 52.31   +00 14 56.5   23.7z 17BB245   T09  C~89UU      
2017 01  28.52565  10 04 52.22   +00 14 56.7   23.8z 17BB245   T09  C~89UU      
2017 01  28.53902  10 04 52.16   +00 14 56.9   23.8z 17BB245   T09  C~89UU      
2017 01  28.55243  10 04 52.08   +00 14 56.9   24.0z 17BB245   T09  C~89UU      
2017 01  28.57125  10 04 51.98   +00 14 57.4   23.6z 17BB245   T09  C~89UU      
2017 02  02.38415  10 04 26.98   +00 16 06.4   24.7r 17BB245   T09  C~89UU      
2017 02  02.39961  10 04 26.90   +00 16 06.6   24.7r 17BB245   T09  C~89UU      
2017 02  02.52479  10 04 26.22   +00 16 08.3   24.4r 17BB245   T09  C~89UU      
2017 03  22.333160 10 00 15.21   +00 35 38.3         17BB245   T09  C~89UU      
2017 03  29.242866 09 59 46.47   +00 38 51.9         17BB245   T09  C~89UU      
2018 01  17.47798  10 13 25.72   -01 11 50.7   23.7i 17BB245   T09  C~8eW5      
2018 01  17.50489  10 13 25.59   -01 11 50.9   23.7i 17BB245   T09  C~8eW5      
2018 01  17.53186  10 13 25.47   -01 11 50.7   23.8i 17BB245   T09  C~8eW5      
2018 01  17.55876  10 13 25.36   -01 11 50.6   23.7i 17BB245   T09  C~8eW5      
2018 01  17.56953  10 13 25.31   -01 11 50.4   24.0i 17BB245   T09  C~8eW5      
2018 01  17.59367  10 13 25.21   -01 11 50.2   23.9i 17BB245   T09  C~8eW5      
2018 01  17.60705  10 13 25.12   -01 11 50.2   23.8i 17BB245   T09  C~8eW5      

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     0.00       0.00    -0.16
     2   0.0001      0.00    -0.21       0.00    -0.04
     3   0.0001      0.00    -0.04       0.00     0.12
     4   0.0032      0.00     0.14       0.00     0.04
     5   0.0032      0.00     0.09       0.00     0.07
     6  13.9965      0.00    -0.01       0.00    -0.06
     7  13.9966      0.00     0.00       0.00    -0.05
     8  15.0365      0.00     0.14       0.00    -0.05
     9  15.0503      0.00     0.10       0.00     0.10
    10  15.0504      0.00    -0.10       0.00     0.11
    11  15.0504      0.00     0.05       0.00     0.13
    12  15.0505      0.00    -0.11       0.00    -0.04
    13  15.0505      0.00    -0.14       0.00     0.21
    14  15.0637      0.00    -0.10       0.00    -0.03
    15  15.0637      0.00    -0.05       0.00    -0.08
    16  15.0641      0.00    -0.13       0.00    -0.35
    17  15.1950      0.00    -0.00       0.00    -0.03
    18  15.2139      0.00     0.01       0.00    -0.09
    19  16.0195      0.00     0.14       0.00     0.17
    20  16.0195      0.00    -0.02       0.00    -0.15
    21  16.0196      0.00    -0.02       0.00    -0.06
    22  16.0197      0.00     0.12       0.00    -0.07
    23  16.0197      0.00     0.09       0.00     0.08
    24  16.0198      0.00     0.20       0.00     0.18
    25  16.0198      0.00    -0.26       0.00     0.12

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.

17BB245    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        90.982    90.981    90.983
ecceobj         0.627     0.627     0.627
incobj         18.958    18.958    18.958
qmin           32.399    32.425    32.400
qmax          153.196   153.434   158.865
amean          89.985    90.156    92.016
amin           87.666    87.563    89.212
amax           93.509    93.518    96.796
emean           0.624     0.625     0.632
emin            0.602     0.603     0.612
emax            0.643     0.644     0.650
imean          20.476    20.488    20.459
imin           19.182    19.111    19.121
imax           22.182    22.221    22.329
excite_mean     0.716     0.716     0.722
fracstop        1.000     1.000     1.000
cjmean          2.864     2.865     2.865

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       173.1     171.2     165.7
kozaiamp        180.0     180.0     180.0