Orbit Fit and Astrometric record for 17BC230

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: 17BC230   
# Created Tue Apr  1 01:11:00 2025
# Orbit generated from Bernstein formalism
# Fitting     62 observations of     63
# Arc:   2.26y
# First observation: 2016/11/28
#  Last observation: 2019/03/03
Preliminary a, adot, b, bdot, g, gdot:
   0.000006   0.029526   0.000019  -0.002420   0.027625   0.000000
# Chi-squared of fit:    56.93 DOF:    118 RMS:  0.17
# Min/Max residuals:    -0.54    0.43
# Exact a, adot, b, bdot, g, gdot:
  1.534455E-05  2.864404E-02 -9.868916E-07 -2.316702E-03  2.691498E-02 -5.129026E-03
# Covariance matrix:
  7.8165E-14 -1.6108E-13  1.7058E-15  3.9005E-14  4.6100E-14 -4.2699E-12
 -1.6108E-13  4.5479E-12  2.1721E-13 -9.4920E-13  1.4173E-12  1.1898E-10
  1.7058E-15  2.1721E-13  4.3903E-14 -8.8323E-14  8.5852E-14  5.7753E-12
  3.9005E-14 -9.4920E-13 -8.8323E-14  4.2151E-13 -2.8430E-13 -2.6349E-11
  4.6100E-14  1.4173E-12  8.5852E-14 -2.8430E-13  6.2859E-13  3.6847E-11
 -4.2699E-12  1.1898E-10  5.7753E-12 -2.6349E-11  3.6847E-11  3.2880E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.290199  151.915053    0.988179   -0.012473   -0.077467  2457721.092239
# Heliocentric elements and errors
Epoch:              2457720.5000  =  2016/11/28
Mean Anomaly:          311.06348 +/-     0.067
Argument of Peri:      315.23404 +/-     0.203
Long of Asc Node:      268.41535 +/-     0.005
Inclination:            10.47323 +/-     0.000
Eccentricity:         0.23168686 +/-    0.0020
Semi-Major Axis:     42.04451055 +/-    0.0342
Time of Perihelion: 2471256.5810 +/-       8.6
Perihelion:          32.30334975 +/-    0.0870
Aphelion:            51.78567136 +/-    0.0930
Period (y)              272.6291 +/-      0.33
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.95695853 +/-    0.0010
Ecliptic Y           18.16649571 +/-    0.0005
Ecliptic Z           -5.99803705 +/-    0.0002
Ecliptic XDOT        -0.00088155 +/-    0.0000
Ecliptic YDOT        -0.00283769 +/-    0.0000
Ecliptic ZDOT        -0.00014839 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.24574088 +/-    0.0009
Geocenter to KBO     37.15403667 +/-    0.0011
# Hcoef:  9.75

The following table shows the complete astrometric record for 17BC230. 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 (17BC230) followed by the observatory code and reference code for the source of the astrometry.

2016 11  28.59145  10 02 25.44   +02 06 10.7   25.7r 17BC230   T09  C~7uj9      
2016 11  28.59529  10 02 25.41   +02 06 10.7   25.8r 17BC230   T09  C~7uj9      
2016 11  28.59911  10 02 25.41   +02 06 10.7   25.9r 17BC230   T09  C~7uj9      
2016 11  28.60294  10 02 25.44   +02 06 10.7   25.7r 17BC230   T09  C~7uj9      
2016 11  28.60679  10 02 25.41   +02 06 10.5   25.7r 17BC230   T09  C~7uj9      
2016 11  28.61062  10 02 25.43   +02 06 10.5   26.3r 17BC230   T09  C~7uj9      
2016 11  29.54660  10 02 25.43   +02 05 54.1   25.2i 17BC230   T09  C~7uj9      
2016 11  29.55428  10 02 25.45   +02 05 53.7   25.8i 17BC230   T09  C~7uj9      
2016 11  29.55811  10 02 25.45   +02 05 53.4   25.8i 17BC230   T09  C~7uj9      
2016 11  29.56198  10 02 25.44   +02 05 53.1   25.6i 17BC230   T09  C~7uj9      
2016 12  25.52138  10 01 50.43   +02 01 42.5   26.4r 17BC230   T09  C~7uj9      
2016 12  25.53531  10 01 50.38   +02 01 41.8   26.4r 17BC230   T09  C~7uj9      
2016 12  25.57554  10 01 50.26   +02 01 41.3   25.6i 17BC230   T09  C~7uj9      
2016 12  25.60159  10 01 50.18   +02 01 41.7   25.7i 17BC230   T09  C~7uj9      
2016 12  25.61625  10 01 50.15   +02 01 41.0   25.9i 17BC230   T09  C~7uj9      
2017 01  02.50463  10 01 26.86   +02 01 51.8   25.0i 17BC230   T09  C~7uj9      
2017 01  02.50845  10 01 26.83   +02 01 51.9   25.4i 17BC230   T09  C~7uj9      
2017 01  02.51228  10 01 26.83   +02 01 51.6   25.4i 17BC230   T09  C~7uj9      
2017 01  02.58611  10 01 26.58   +02 01 51.9   26.0g 17BC230   T09  C~7uj9      
2017 01  21.48947  10 00 11.70   +02 04 54.0   25.4z 17BC230   T09  C~7uj9      
2017 01  21.49330  10 00 11.70   +02 04 54.0   25.2z 17BC230   T09  C~7uj9      
2017 01  21.51563  10 00 11.57   +02 04 54.2   25.4z 17BC230   T09  C~7uj9      
2017 01  21.54162  10 00 11.45   +02 04 54.7   25.2z 17BC230   T09  C~7uj9      
2017 01  21.54547  10 00 11.43   +02 04 54.9   24.7z 17BC230   T09  C~7uj9      
2017 01  23.35198  10 00 03.18   +02 05 23.1   25.0r 17BC230   T09  C~7uj9      
2017 01  23.39955  10 00 02.96   +02 05 23.9   25.9r 17BC230   T09  C~7uj9      
2017 01  23.41253  10 00 02.89   +02 05 23.9   24.7r 17BC230   T09  C~7uj9      
2017 01  23.41887  10 00 02.86   +02 05 24.1   25.7r 17BC230   T09  C~7uj9      
2017 01  23.43372  10 00 02.80   +02 05 24.4   25.3r 17BC230   T09  C~7uj9      
2017 01  23.44310  10 00 02.75   +02 05 24.4   25.0r 17BC230   T09  C~7uj9      
2017 01  23.45235  10 00 02.73   +02 05 24.6   25.0r 17BC230   T09  C~7uj9      
2017 01  23.45653  10 00 02.68   +02 05 24.7   24.5r 17BC230   T09  C~7uj9      
2017 01  23.50600  10 00 02.44   +02 05 25.4   25.5i 17BC230   T09  C~7uj9      
2017 01  23.53190  10 00 02.33   +02 05 25.9   25.2i 17BC230   T09  C~7uj9      
2017 01  23.53459  10 00 02.32   +02 05 25.9   25.5i 17BC230   T09  C~7uj9      
2017 01  23.54715  10 00 02.25   +02 05 26.1   25.3i 17BC230   T09  C~7uj9      
2017 01  23.56544  10 00 02.20   +02 05 26.6   25.1i 17BC230   T09  C~7uj9      
2017 01  23.59562  10 00 02.03   +02 05 27.1   25.2i 17BC230   T09  C~7uj9      
2017 01  23.59947  10 00 02.02   +02 05 26.9   25.2i 17BC230   T09  C~7uj9      
2017 01  30.39870  09 59 29.44   +02 07 29.3   25.3i 17BC230   T09  C~7uj9      
2017 01  30.42076  09 59 29.32   +02 07 29.8   24.7i 17BC230   T09  C~7uj9      
2017 01  30.42459  09 59 29.32   +02 07 29.6   24.8i 17BC230   T09  C~7uj9      
2017 01  30.44278  09 59 29.22   +02 07 30.1   24.5i 17BC230   T09  C~7uj9      
2017 01  30.50920  09 59 28.88   +02 07 31.1   24.8z 17BC230   T09  C~7uj9      
2017 01  30.57591  09 59 28.56   +02 07 32.5   24.3z 17BC230   T09  C~7uj9      
2017 01  30.59058  09 59 28.47   +02 07 32.7   24.5z 17BC230   T09  C~7uj9      
2017 01  30.60170  09 59 28.39   +02 07 33.3   24.2z 17BC230   T09  C~7uj9      
2017 02  02.42933  09 59 14.37   +02 08 30.9   25.8r 17BC230   T09  C~7uj9      
2017 02  02.43804  09 59 14.33   +02 08 31.1   25.1r 17BC230   T09  C~7uj9      
2017 02  02.44397  09 59 14.32   +02 08 31.2   25.1r 17BC230   T09  C~7uj9      
2017 02  02.47353  09 59 14.15   +02 08 31.7   25.0r 17BC230   T09  C~7uj9      
2017 02  23.32550  09 57 26.55   +02 17 12.0   25.6g 17BC230   T09  C~7uj9      
2017 02  23.35667  09 57 26.37   +02 17 12.6   26.0g 17BC230   T09  C~7uj9      
2017 02  23.47596  09 57 25.74   +02 17 16.2   25.9r 17BC230   T09  C~7uj9      
2017 02  23.48959  09 57 25.67   +02 17 16.7   26.1r 17BC230   T09  C~7uj9      
2017 02  23.50705  09 57 25.60   +02 17 17.0   25.2r 17BC230   T09  C~7uj9      
2017 03  04.31098  09 56 40.96   +02 21 32.1   25.0z 17BC230   T09  C~7uj9      
2017 03  04.33650  09 56 40.84   +02 21 32.8   24.7z 17BC230   T09  C~7uj9      
2017 03  04.47080  09 56 40.16   +02 21 36.8   25.1i 17BC230   T09  C~7uj9      
2017 03  04.49253  09 56 40.04   +02 21 37.1   25.5i 17BC230   T09  C~7uj9      
2018 01  17.461210 10 06 37.59   +01 20 39.1         17BC230   T09  C~83Ep      
2018 01  17.545345 10 06 37.24   +01 20 40.2         17BC230   T09  C~83Ep      
2019 03  03.317002 10 09 07.55   +00 53 32.8         17BC230   T09  C~83Ep      

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     0.31       0.00    -0.08
     2   0.0000     -0.42    -0.14      -0.16    -0.17
     3   0.0000     -0.42    -0.16      -0.16    -0.10
     4   0.0000      0.00     0.23       0.00     0.12
     5   0.0000     -0.35    -0.14      -0.35    -0.16
     6   0.0001     -0.07     0.12      -0.24     0.01
     7   0.0026      5.69    -0.39     -15.60     0.43
     8   0.0026      6.11    -0.01     -15.86     0.29
     9   0.0026      6.22     0.08     -16.15     0.08
    10   0.0027      6.18     0.03     -16.48    -0.19
    11   0.0737   -397.22 (   0.01)   -435.40 (   0.89)
    12   0.0738   -397.68     0.07    -436.32     0.18
    13   0.0739   -399.18     0.07    -437.42    -0.29
    14   0.0739   -400.45    -0.22    -437.47     0.06
    15   0.0740   -400.62     0.16    -438.28    -0.53
    16   0.0956   -731.33     0.01    -550.73     0.16
    17   0.0956   -731.78    -0.26    -550.80     0.15
    18   0.0956   -731.68     0.03    -551.08    -0.08
    19   0.0958   -735.29     0.02    -552.11    -0.06
    20   0.1476  -1850.34    -0.13    -775.53     0.02
    21   0.1476  -1850.34     0.14    -775.53     0.06
    22   0.1476  -1852.23    -0.18    -776.03    -0.21
    23   0.1477  -1854.09    -0.21    -776.19    -0.11
    24   0.1477  -1854.45    -0.29    -776.11     0.01
    25   0.1527  -1980.16     0.05    -793.09     0.14
    26   0.1528  -1983.53     0.09    -793.50     0.19
    27   0.1528  -1984.51     0.04    -793.87    -0.05
    28   0.1528  -1985.00     0.01    -793.84     0.04
    29   0.1529  -1985.95     0.13    -793.87     0.15
    30   0.1529  -1986.65     0.10    -794.14    -0.03
    31   0.1529  -1987.00     0.42    -794.06     0.15
    32   0.1530  -1987.74    -0.02    -794.23     0.02
    33   0.1531  -1991.35    -0.07    -794.83    -0.11
    34   0.1532  -1993.07     0.08    -794.94     0.04
    35   0.1532  -1993.21     0.14    -794.99     0.01
    36   0.1532  -1994.27    -0.01    -795.18    -0.05
    37   0.1532  -1995.14     0.43    -794.97     0.33
    38   0.1533  -1997.71     0.04    -795.40     0.20
    39   0.1533  -1997.78     0.25    -795.64    -0.00
    40   0.1720  -2498.11    -0.09    -852.34     0.13
    41   0.1720  -2499.97    -0.25    -852.50     0.14
    42   0.1720  -2499.90     0.11    -852.69    -0.02
    43   0.1721  -2501.48    -0.06    -852.74     0.07
    44   0.1723  -2506.61    -0.04    -853.60    -0.25
    45   0.1724  -2511.59     0.13    -853.97    -0.09
    46   0.1725  -2512.93    -0.07    -854.25    -0.26
    47   0.1725  -2514.26    -0.54    -854.11    -0.04
    48   0.1803  -2731.30    -0.11    -873.88     0.06
    49   0.1803  -2731.94    -0.05    -873.90     0.10
    50   0.1803  -2732.11     0.24    -873.86     0.19
    51   0.1804  -2734.67     0.02    -874.29    -0.03
    52   0.2375  -4428.06     0.06    -952.44     0.08
    53   0.2376  -4430.80    -0.07    -952.83    -0.27
    54   0.2379  -4440.91    -0.20    -952.76    -0.05
    55   0.2379  -4442.06    -0.22    -952.66     0.06
    56   0.2380  -4443.15     0.15    -952.75    -0.00
    57   0.2621  -5159.57    -0.03    -948.24    -0.03
    58   0.2621  -5161.50     0.12    -948.21    -0.03
    59   0.2625  -5172.45     0.07    -948.04    -0.03
    60   0.2626  -5174.24     0.04    -948.39    -0.41
    61   1.1359   4500.13    -0.10   -1228.88    -0.06
    62   1.1361   4494.83     0.07   -1229.69     0.09
    63   2.2580   7179.81     0.01   -1960.68     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.

17BC230    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        41.755    41.815    41.699
ecceobj         0.225     0.230     0.220
incobj         10.453    10.452    10.453
qmin           31.545    31.079    31.816
qmax           53.887    54.142    52.440
amean          42.127    41.786    41.809
amin           40.596    40.671    41.004
amax           43.111    43.049    42.453
emean           0.208     0.221     0.198
emin            0.180     0.187     0.160
emax            0.250     0.258     0.235
imean          16.180    16.645    14.675
imin           11.601    11.669    11.921
imax           18.183    19.601    17.286
excite_mean     0.348     0.363     0.322
fracstop        1.000     1.000     1.000
cjmean          2.937     2.922     2.955

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       178.3     186.3     183.8
kozaiamp        180.0     180.0     180.0