Orbit Fit and Astrometric record for 17BC241

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: 17BC241   
# Created Mon Apr 28 01:11:03 2025
# Orbit generated from Bernstein formalism
# Fitting     23 observations of     23
# Arc:   1.95y
# First observation: 2015/03/22
#  Last observation: 2017/03/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000054   0.035980   0.000003  -0.000094   0.027545   0.000000
# Chi-squared of fit:    10.85 DOF:     40 RMS:  0.12
# Min/Max residuals:    -0.22    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.984756E-05  3.576156E-02 -4.414315E-07 -7.527508E-05  2.834133E-02  4.241046E-03
# Covariance matrix:
  2.4421E-13 -3.5660E-13  1.3809E-17  1.0476E-15 -1.3782E-13 -3.2121E-12
 -3.5660E-13  6.9729E-12 -7.7931E-16 -3.0793E-14  4.2518E-12  9.7755E-11
  1.3809E-17 -7.7931E-16  2.3675E-13 -1.2987E-13 -6.0197E-15 -3.9943E-14
  1.0476E-15 -3.0793E-14 -1.2987E-13  9.7969E-14 -4.2745E-15 -3.6085E-13
 -1.3782E-13  4.2518E-12 -6.0197E-15 -4.2745E-15  3.7636E-12  6.6365E-11
 -3.2121E-12  9.7755E-11 -3.9943E-14 -3.6085E-13  6.6365E-11  1.4207E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -13.148054  141.021402   -0.641645   -0.172339   -0.738350  2457103.901035
# Heliocentric elements and errors
Epoch:              2457100.5000  =  2015/03/19
Mean Anomaly:            7.09472 +/-     0.046
Argument of Peri:      246.71479 +/-     0.167
Long of Asc Node:      231.71997 +/-     0.003
Inclination:            12.87093 +/-     0.000
Eccentricity:         0.49357272 +/-    0.0005
Semi-Major Axis:     69.17684916 +/-    0.0425
Time of Perihelion: 2452958.8612 +/-      26.6
Perihelion:          35.03304370 +/-    0.0421
Aphelion:           103.32065462 +/-    0.0731
Period (y)              575.3729 +/-      0.53
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -27.70678781 +/-    0.0018
Ecliptic Y           21.59096255 +/-    0.0015
Ecliptic Z           -8.02602102 +/-    0.0005
Ecliptic XDOT        -0.00248533 +/-    0.0000
Ecliptic YDOT        -0.00244147 +/-    0.0000
Ecliptic ZDOT        -0.00010019 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.03127486 +/-    0.0017
Geocenter to KBO     35.28415883 +/-    0.0024
# Hcoef:  8.81

The following table shows the complete astrometric record for 17BC241. 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 (17BC241) followed by the observatory code and reference code for the source of the astrometry.

2015 03  22.400257 09 16 57.90   +02 00 11.8         17BC241   T09  C~86ul      
2015 03  22.43873  09 16 57.77   +02 00 13.0   24.6i 17BC241   T09  C~8nfR      
2015 03  22.44242  09 16 57.76   +02 00 13.1   24.2i 17BC241   T09  C~8nfR      
2015 03  22.44800  09 16 57.72   +02 00 13.1   23.8i 17BC241   T09  C~8nfR      
2015 03  22.45082  09 16 57.71   +02 00 13.3   24.1i 17BC241   T09  C~8nfR      
2015 03  22.453542 09 16 57.72   +02 00 13.4         17BC241   T09  C~86ul      
2016 04  04.268116 09 24 03.98   +01 29 04.4         17BC241   T09  C~86ul      
2016 11  28.622398 09 39 40.55   +00 19 41.7         17BC241   T09  C~86ul      
2016 12  25.483314 09 38 54.57   +00 14 15.1         17BC241   T09  C~86ul      
2017 01  21.36859  09 37 08.23   +00 16 58.6   24.5z 17BC241   T09  C~86ul      
2017 01  21.37198  09 37 08.22   +00 16 59.0   23.9z 17BC241   T09  C~86ul      
2017 01  21.38540  09 37 08.15   +00 16 58.8   24.7z 17BC241   T09  C~86ul      
2017 01  21.39346  09 37 08.10   +00 16 59.5   24.7z 17BC241   T09  C~86ul      
2017 01  21.40419  09 37 08.04   +00 16 59.3   24.3z 17BC241   T09  C~86ul      
2017 01  21.41223  09 37 08.01   +00 16 59.5   24.1z 17BC241   T09  C~86ul      
2017 02  01.47870  09 36 13.55   +00 20 18.6   23.9i 17BC241   T09  C~86ul      
2017 02  01.51446  09 36 13.36   +00 20 19.6   23.9i 17BC241   T09  C~86ul      
2017 02  01.51997  09 36 13.34   +00 20 19.4   23.9i 17BC241   T09  C~86ul      
2017 02  01.55545  09 36 13.15   +00 20 20.1   24.1i 17BC241   T09  C~86ul      
2017 02  01.62394  09 36 12.80   +00 20 21.7   24.3i 17BC241   T09  C~86ul      
2017 02  01.62661  09 36 12.79   +00 20 21.7   23.9i 17BC241   T09  C~86ul      
2017 03  04.385780 09 33 38.33   +00 34 22.5         17BC241   T09  C~86ul      
2017 03  04.388470 09 33 38.32   +00 34 22.6         17BC241   T09  C~86ul      

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     0.08
     2   0.0001     -2.22     0.07       0.54     0.08
     3   0.0001     -2.40     0.11       0.59     0.07
     4   0.0001     -2.97    -0.13       0.40    -0.19
     5   0.0001     -3.17    -0.17       0.55    -0.09
     6   0.0001     -3.06     0.10       0.69     0.02
     7   1.0373   6654.74    -0.01     204.20     0.05
     8   1.6899  21373.11    -0.03     617.44    -0.05
     9   1.7634  20813.50     0.11      89.60    -0.06
    10   1.8370  19231.96     0.18    -252.88    -0.18
    11   1.8370  19231.69     0.16    -252.55     0.19
    12   1.8371  19230.74     0.21    -253.07    -0.22
    13   1.8371  19229.80    -0.13    -252.63     0.28
    14   1.8371  19229.00    -0.14    -253.10    -0.10
    15   1.8371  19228.51    -0.04    -253.05     0.02
    16   1.8674  18383.25    -0.05    -318.15     0.04
    17   1.8675  18380.21    -0.21    -318.09     0.25
    18   1.8675  18379.98     0.01    -318.37    -0.01
    19   1.8676  18377.03    -0.08    -318.60    -0.09
    20   1.8678  18371.50    -0.10    -318.71     0.07
    21   1.8678  18371.36    -0.03    -318.76     0.03
    22   1.9520  15890.91     0.06    -239.80    -0.11
    23   1.9521  15890.73     0.09    -239.75    -0.08

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.

17BC241    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        68.666    68.837    68.498
ecceobj         0.490     0.492     0.488
incobj         12.856    12.856    12.857
qmin           34.295    33.879    33.622
qmax          103.769   105.304   104.508
amean          68.080    68.522    67.909
amin           67.093    67.506    65.831
amax           69.416    70.087    69.462
emean           0.482     0.488     0.487
emin            0.471     0.472     0.468
emax            0.495     0.506     0.505
imean          14.254    13.979    13.156
imin           13.594    12.901    11.520
imax           14.850    15.317    14.040
excite_mean     0.541     0.545     0.538
fracstop        1.000     1.000     1.000
cjmean          2.995     2.995     2.997

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       200.5     173.7     196.5
kozaiamp        180.0     180.0     180.0