Orbit Fit and Astrometric record for 17BH237

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: 17BH237   
# Created Tue Apr  1 01:11:02 2025
# Orbit generated from Bernstein formalism
# Fitting     42 observations of     42
# Arc:   2.45y
# First observation: 2016/11/25
#  Last observation: 2019/05/09
Preliminary a, adot, b, bdot, g, gdot:
  -0.000007   0.020317  -0.000001   0.001509   0.021896   0.000000
# Chi-squared of fit:    46.50 DOF:     78 RMS:  0.19
# Min/Max residuals:    -0.43    0.45
# Exact a, adot, b, bdot, g, gdot:
  1.455158E-05  2.009416E-02  4.773754E-07  1.513329E-03  2.157043E-02  6.958119E-03
# Covariance matrix:
  1.9126E-13  2.9989E-13  4.1647E-14  1.5499E-14  3.9705E-13  9.2580E-12
  2.9989E-13  1.1328E-12  9.5314E-14  8.2277E-14  1.0314E-12  3.9549E-11
  4.1647E-14  9.5314E-14  5.6392E-14 -2.4604E-14  1.1356E-13  2.7403E-12
  1.5499E-14  8.2277E-14 -2.4604E-14  9.0602E-14  6.3300E-14  3.8325E-12
  3.9705E-13  1.0314E-12  1.1356E-13  6.3300E-14  1.1378E-12  3.3497E-11
  9.2580E-12  3.9549E-11  2.7403E-12  3.8325E-12  3.3497E-11  1.7125E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.967516  151.352990    0.991201   -0.005478   -0.035962  2457718.115333
# Heliocentric elements and errors
Epoch:              2457710.5000  =  2016/11/18
Mean Anomaly:           46.14396 +/-     0.134
Argument of Peri:      211.72661 +/-     0.038
Long of Asc Node:      215.64176 +/-     0.004
Inclination:             9.82653 +/-     0.000
Eccentricity:         0.33619118 +/-    0.0021
Semi-Major Axis:     54.63675668 +/-    0.0892
Time of Perihelion: 2438802.8247 +/-      29.3
Perihelion:          36.26836100 +/-    0.1295
Aphelion:            73.00515235 +/-    0.1657
Period (y)              403.8644 +/-      0.99
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.74809420 +/-    0.0020
Ecliptic Y           22.83678961 +/-    0.0011
Ecliptic Z           -7.22631711 +/-    0.0004
Ecliptic XDOT        -0.00201226 +/-    0.0000
Ecliptic YDOT        -0.00181243 +/-    0.0000
Ecliptic ZDOT         0.00005202 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.40743056 +/-    0.0018
Geocenter to KBO     46.35976082 +/-    0.0023
# Hcoef:  8.74

The following table shows the complete astrometric record for 17BH237. 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 (17BH237) followed by the observatory code and reference code for the source of the astrometry.

2016 11  25.614544 10 00 47.74   +02 35 58.6         17BH237   T09  C~83Eq      
2016 11  25.629956 10 00 47.74   +02 35 58.0         17BH237   T09  C~83Eq      
2016 11  25.637913 10 00 47.74   +02 35 57.9         17BH237   T09  C~83Eq      
2017 01  02.49315  09 59 58.10   +02 33 38.3   25.3i 17BH237   T09  C~82nB      
2017 01  02.50080  09 59 58.05   +02 33 38.6   25.6i 17BH237   T09  C~82nB      
2017 01  02.50845  09 59 58.03   +02 33 38.6   26.0i 17BH237   T09  C~82nB      
2017 01  02.51228  09 59 58.02   +02 33 38.8   25.0i 17BH237   T09  C~82nB      
2017 01  02.51993  09 59 58.01   +02 33 39.0   24.9i 17BH237   T09  C~82nB      
2017 01  21.42903  09 58 56.85   +02 36 57.4   25.0z 17BH237   T09  C~82nB      
2017 01  21.44467  09 58 56.78   +02 36 57.6   24.3z 17BH237   T09  C~82nB      
2017 01  21.44850  09 58 56.78   +02 36 57.6   25.0z 17BH237   T09  C~82nB      
2017 01  21.48947  09 58 56.64   +02 36 58.3   24.8z 17BH237   T09  C~82nB      
2017 01  21.50089  09 58 56.59   +02 36 58.4   25.0z 17BH237   T09  C~82nB      
2017 01  21.52708  09 58 56.48   +02 36 58.8   24.6z 17BH237   T09  C~82nB      
2017 01  21.54162  09 58 56.42   +02 36 59.1   25.0z 17BH237   T09  C~82nB      
2017 01  21.58134  09 58 56.30   +02 36 59.1   25.4z 17BH237   T09  C~82nB      
2017 01  23.37416  09 58 49.60   +02 37 27.0   26.0r 17BH237   T09  C~82nB      
2017 01  23.38883  09 58 49.55   +02 37 27.5   26.1r 17BH237   T09  C~82nB      
2017 01  23.59562  09 58 48.75   +02 37 30.3   25.5i 17BH237   T09  C~82nB      
2017 01  30.42076  09 58 22.29   +02 39 26.2   25.0i 17BH237   T09  C~82nB      
2017 01  30.42459  09 58 22.25   +02 39 26.4   24.8i 17BH237   T09  C~82nB      
2017 01  30.44661  09 58 22.16   +02 39 27.0   24.8i 17BH237   T09  C~82nB      
2017 01  30.45035  09 58 22.15   +02 39 26.9   24.2i 17BH237   T09  C~82nB      
2017 01  30.46494  09 58 22.07   +02 39 27.4   24.8i 17BH237   T09  C~82nB      
2017 01  30.46877  09 58 22.08   +02 39 27.4   24.7i 17BH237   T09  C~82nB      
2017 01  30.49455  09 58 21.99   +02 39 27.7   24.1z 17BH237   T09  C~82nB      
2017 01  30.50920  09 58 21.94   +02 39 28.4   26.3z 17BH237   T09  C~83Eq      
2017 01  30.52066  09 58 21.87   +02 39 28.2   24.7z 17BH237   T09  C~82nB      
2017 01  30.55762  09 58 21.72   +02 39 28.9   26.0z 17BH237   T09  C~83Eq      
2017 01  30.58347  09 58 21.61   +02 39 29.5   26.2z 17BH237   T09  C~83Eq      
2017 01  30.59788  09 58 21.55   +02 39 29.9   25.1z 17BH237   T09  C~82nB      
2017 01  30.60170  09 58 21.54   +02 39 29.9   25.1z 17BH237   T09  C~82nB      
2017 01  30.60540  09 58 21.54   +02 39 29.9   24.8z 17BH237   T09  C~82nB      
2017 02  02.42933  09 58 10.17   +02 40 23.4   25.6r 17BH237   T09  C~82nB      
2017 02  02.46207  09 58 10.01   +02 40 23.9   26.3r 17BH237   T09  C~82nB      
2017 02  02.47353  09 58 09.98   +02 40 24.0   26.2r 17BH237   T09  C~82nB      
2017 03  04.448872 09 56 05.87   +02 52 01.1         17BH237   T09  C~83Eq      
2017 03  04.470791 09 56 05.77   +02 52 01.7         17BH237   T09  C~83Eq      
2019 02  05.430856 10 06 57.83   +02 02 16.6         17BH237   T09  C~83Eq      
2019 05  09.259841 10 02 28.51   +02 37 33.9         17BH237   T09  C~83Eq      
2019 05  09.277239 10 02 28.51   +02 37 34.0         17BH237   T09  C~83Eq      
2019 05  09.309493 10 02 28.49   +02 37 34.4         17BH237   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     0.04       0.00     0.13
     2   0.0000      0.21     0.14      -0.56    -0.25
     3   0.0001      0.24     0.13      -0.66    -0.25
     4   0.1037   -647.96     0.33    -391.34    -0.11
     5   0.1037   -648.77    -0.17    -391.32    -0.02
     6   0.1037   -649.05    -0.13    -391.42    -0.06
     7   0.1038   -649.26    -0.19    -391.29     0.11
     8   0.1038   -649.47    -0.08    -391.15     0.31
     9   0.1555  -1577.55    -0.21    -525.28    -0.03
    10   0.1556  -1578.60    -0.35    -525.46    -0.12
    11   0.1556  -1578.60    -0.13    -525.46    -0.10
    12   0.1557  -1580.81     0.03    -525.53     0.07
    13   0.1557  -1581.55    -0.04    -525.70    -0.03
    14   0.1558  -1583.24    -0.20    -525.90    -0.08
    15   0.1559  -1584.18    -0.31    -525.93    -0.03
    16   0.1560  -1585.87     0.31    -526.56    -0.43
    17   0.1609  -1689.69    -0.31    -535.46     0.02
    18   0.1609  -1690.57    -0.32    -535.26     0.30
    19   0.1615  -1702.78    -0.26    -536.82    -0.14
    20   0.1802  -2114.82     0.45    -566.60    -0.14
    21   0.1802  -2115.45     0.06    -566.62    -0.15
    22   0.1802  -2116.92    -0.01    -566.53     0.03
    23   0.1802  -2117.03     0.12    -566.67    -0.10
    24   0.1803  -2118.32    -0.25    -566.62     0.01
    25   0.1803  -2118.18     0.13    -566.57     0.08
    26   0.1804  -2119.55     0.40    -566.76    -0.01
    27   0.1804  -2120.50     0.38    -566.37     0.45
    28   0.1804  -2121.41     0.19    -566.92    -0.06
    29   0.1805  -2123.76     0.19    -567.05    -0.04
    30   0.1806  -2125.52     0.07    -567.06     0.05
    31   0.1807  -2126.50     0.00    -567.00     0.17
    32   0.1807  -2126.64     0.10    -567.05     0.13
    33   0.1807  -2126.64     0.34    -567.05     0.15
    34   0.1884  -2304.99     0.07    -576.37     0.24
    35   0.1885  -2307.41    -0.23    -576.74    -0.01
    36   0.1885  -2307.86     0.06    -576.80    -0.04
    37   0.2706  -4294.24    -0.10    -571.99     0.01
    38   0.2707  -4295.85    -0.26    -571.95    -0.02
    39   2.1953   5905.26    -0.01      47.12    -0.01
    40   2.4494   1381.40    -0.02     617.19     0.10
    41   2.4495   1381.37     0.09     617.28    -0.01
    42   2.4495   1380.95    -0.06     617.55    -0.11

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.

17BH237    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        54.609    54.866    54.358
ecceobj         0.341     0.346     0.335
incobj          9.840     9.839     9.840
qmin           35.146    34.870    35.115
qmax           74.615    75.724    74.789
amean          54.397    54.672    54.298
amin           53.741    53.977    53.575
amax           55.199    55.567    55.253
emean           0.340     0.346     0.336
emin            0.329     0.331     0.323
emax            0.352     0.363     0.355
imean          10.545    10.369    10.282
imin            9.737     9.630     9.547
imax           10.924    11.238    11.210
excite_mean     0.386     0.390     0.381
fracstop        1.000     1.000     1.000
cjmean          3.038     3.038     3.043

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       185.7     181.9     181.7
kozaiamp        180.0     179.9     180.0