Orbit Fit and Astrometric record for 17BC232

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: 17BC232   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   0.90y
# First observation: 2016/04/02
#  Last observation: 2017/02/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000070   0.022180  -0.000000   0.000202   0.022669   0.000000
# Chi-squared of fit:    16.27 DOF:     50 RMS:  0.13
# Min/Max residuals:    -0.50    0.34
# Exact a, adot, b, bdot, g, gdot:
  1.423525E-05  2.206564E-02  4.382963E-07  2.054558E-04  2.310073E-02 -1.749040E-04
# Covariance matrix:
  3.2267E-13  5.2228E-12  4.3107E-15  8.9821E-15  2.2925E-12  2.0697E-10
  5.2228E-12  2.3500E-10  1.5239E-13  2.7611E-13  8.5521E-11  8.5378E-09
  4.3107E-15  1.5239E-13  1.3642E-13 -1.6884E-13  5.9781E-14  5.6844E-12
  8.9821E-15  2.7611E-13 -1.6884E-13  3.4408E-13  1.1446E-13  1.0502E-11
  2.2925E-12  8.5521E-11  5.9781E-14  1.1446E-13  3.2885E-11  3.1682E-09
  2.0697E-10  8.5378E-09  5.6844E-12  1.0502E-11  3.1682E-09  3.1250E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.594446 -175.171283   -0.137651    0.027577   -0.985666  2457480.889049
# Heliocentric elements and errors
Epoch:              2457480.5000  =  2016/04/02
Mean Anomaly:          351.30875 +/-    47.376
Argument of Peri:       80.55216 +/-    50.313
Long of Asc Node:      113.68182 +/-     0.054
Inclination:             1.64541 +/-     0.001
Eccentricity:         0.02933148 +/-    0.0037
Semi-Major Axis:     45.59971407 +/-    0.0127
Time of Perihelion: 2460195.8213 +/-   14801.2
Perihelion:          44.26220685 +/-    0.1679
Aphelion:            46.93722129 +/-    0.1680
Period (y)              307.9296 +/-      0.13
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -44.09301045 +/-    0.0107
Ecliptic Y           -3.86533669 +/-    0.0009
Ecliptic Z            1.20453752 +/-    0.0003
Ecliptic XDOT         0.00024157 +/-    0.0001
Ecliptic YDOT        -0.00261107 +/-    0.0000
Ecliptic ZDOT         0.00002377 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   44.27849713 +/-    0.0107
Geocenter to KBO     43.28866876 +/-    0.0107
# Hcoef:  7.56

The following table shows the complete astrometric record for 17BC232. 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 (17BC232) followed by the observatory code and reference code for the source of the astrometry.

2016 04  02.388260 12 20 15.41   -00 27 18.2         17BC232   T09  C~83Eq      
2016 04  02.490920 12 20 14.96   -00 27 15.4         17BC232   T09  C~83Eq      
2016 04  04.34598  12 20 07.15   -00 26 25.0   24.7g 17BC232   T09  C~89UT      
2016 04  04.36164  12 20 07.10   -00 26 24.6   24.9g 17BC232   T09  C~89UT      
2016 04  04.38727  12 20 07.00   -00 26 24.0   24.8g 17BC232   T09  C~89UT      
2016 04  15.26605  12 19 22.55   -00 21 41.2   23.1y 17BC232   T09  C~8COq      
2016 04  15.34534  12 19 22.22   -00 21 39.5   23.4y 17BC232   T09  C~8COq      
2016 04  15.40543  12 19 21.94   -00 21 38.0   23.3y 17BC232   T09  C~8COq      
2016 04  15.43760  12 19 21.83   -00 21 37.3   23.3y 17BC232   T09  C~8COq      
2016 04  15.44858  12 19 21.81   -00 21 37.0   23.3y 17BC232   T09  C~8COq      
2016 06  04.251947 12 17 08.59   -00 08 29.7         17BC232   T09  C~83Eq      
2016 06  04.335164 12 17 08.50   -00 08 29.4         17BC232   T09  C~83Eq      
2017 01  23.60759  12 28 47.30   -01 23 07.2   24.0i 17BC232   T09  C~7xTo      
2017 01  23.61293  12 28 47.30   -01 23 07.0   23.8i 17BC232   T09  C~7xTo      
2017 01  23.61560  12 28 47.30   -01 23 07.0   24.0i 17BC232   T09  C~7xTo      
2017 01  23.61828  12 28 47.29   -01 23 06.8   23.9i 17BC232   T09  C~7xTo      
2017 01  23.62095  12 28 47.28   -01 23 06.8   23.9i 17BC232   T09  C~7xTo      
2017 01  23.64653  12 28 47.23   -01 23 06.5   24.3i 17BC232   T09  C~7xTo      
2017 01  28.59194  12 28 39.33   -01 22 04.5   23.9z 17BC232   T09  C~7xTo      
2017 01  28.59808  12 28 39.31   -01 22 04.2   24.0z 17BC232   T09  C~7xTo      
2017 01  28.60879  12 28 39.30   -01 22 04.0   23.7z 17BC232   T09  C~7xTo      
2017 01  28.61418  12 28 39.29   -01 22 04.0   23.9z 17BC232   T09  C~7xTo      
2017 01  28.61691  12 28 39.28   -01 22 04.0   23.8z 17BC232   T09  C~7xTo      
2017 01  28.61959  12 28 39.28   -01 22 03.9   23.5z 17BC232   T09  C~7xTo      
2017 01  28.65069  12 28 39.22   -01 22 03.5   23.7z 17BC232   T09  C~7xTo      
2017 02  23.52167  12 27 29.67   -01 13 46.3   24.2r 17BC232   T09  C~7xTo      
2017 02  23.56346  12 27 29.52   -01 13 45.4   24.5r 17BC232   T09  C~7xTo      
2017 02  23.62726  12 27 29.31   -01 13 43.8   24.3r 17BC232   T09  C~7xTo      

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     0.18       0.00    -0.06
     2   0.0003     -7.31     0.05      -0.10    -0.10
     3   0.0054   -134.83    -0.23      -0.27     0.06
     4   0.0054   -135.68     0.01      -0.20     0.14
     5   0.0055   -137.30     0.18      -0.24     0.12
     6   0.0353   -861.52     0.09      -4.90     0.34
     7   0.0355   -866.74     0.03      -5.30     0.03
     8   0.0356   -871.19    -0.50      -5.59    -0.19
     9   0.0357   -872.98    -0.19      -5.60    -0.17
    10   0.0358   -873.37     0.13      -5.44    -0.00
    11   0.1721  -3020.24     0.11     -74.82    -0.06
    12   0.1723  -3021.60     0.14     -75.08    -0.12
    13   0.8110   8380.48     0.08     -33.67    -0.16
    14   0.8110   8380.40     0.13     -33.49     0.01
    15   0.8110   8380.40     0.20     -33.49     0.01
    16   0.8110   8380.18     0.05     -33.37     0.13
    17   0.8110   8380.04    -0.03     -33.42     0.06
    18   0.8111   8379.24    -0.20     -33.45    -0.00
    19   0.8247   8245.69     0.09     -23.39    -0.19
    20   0.8247   8245.29    -0.11     -23.24    -0.05
    21   0.8247   8245.08     0.01     -23.11     0.06
    22   0.8247   8244.94     0.04     -23.17    -0.01
    23   0.8247   8244.80    -0.01     -23.23    -0.07
    24   0.8247   8244.76     0.03     -23.14     0.02
    25   0.8248   8243.77     0.02     -23.13    -0.02
    26   0.8956   7087.57    -0.16      20.56     0.09
    27   0.8958   7085.15    -0.15      20.50    -0.01
    28   0.8959   7081.62     0.03      20.72     0.15

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.

17BC232    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        45.114    45.467    45.057
ecceobj         0.018     0.069     0.027
incobj          1.646     1.647     1.646
qmin           43.617    41.588    43.284
qmax           47.219    50.084    47.455
amean          45.339    45.681    45.287
amin           44.989    45.311    44.929
amax           45.700    46.079    45.649
emean           0.020     0.073     0.026
emin            0.007     0.060     0.013
emax            0.033     0.087     0.040
imean           0.662     0.634     0.681
imin            0.158     0.103     0.168
imax            0.996     0.988     1.014
excite_mean     0.024     0.074     0.030
fracstop        1.000     1.000     1.000
cjmean          3.117     3.115     3.116

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       202.0     167.8     169.0
kozaiamp        180.0     179.9     180.0