Orbit Fit and Astrometric record for 17BN239

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: 17BN239   
# Created Tue Jan 21 02:11:09 2025
# Orbit generated from Bernstein formalism
# Fitting     17 observations of     17
# Arc:  65.00d
# First observation: 2016/11/28
#  Last observation: 2017/02/01
Preliminary a, adot, b, bdot, g, gdot:
   0.000000   0.021007   0.000003  -0.006952   0.022822   0.000000
# Chi-squared of fit:     9.98 DOF:     28 RMS:  0.14
# Min/Max residuals:    -0.26    0.28
# Exact a, adot, b, bdot, g, gdot:
  1.377561E-05  1.986624E-02 -3.819542E-06 -7.050775E-03  2.223710E-02 -1.776178E-04
# Covariance matrix:
  4.8380E-13 -2.2735E-12  5.6350E-15 -3.2827E-13  8.3593E-13  2.3360E-10
 -2.2735E-12  5.8245E-09  9.3642E-12  1.2046E-09  2.0210E-09  1.9521E-07
  5.6350E-15  9.3642E-12  4.8823E-13 -1.0985E-12  3.4979E-12  3.9551E-10
 -3.2827E-13  1.2046E-09 -1.0985E-12  2.8786E-10  3.9657E-10  3.2720E-08
  8.3593E-13  2.0210E-09  3.4979E-12  3.9657E-10  7.3565E-10  7.8805E-08
  2.3360E-10  1.9521E-07  3.9551E-10  3.2720E-08  7.8805E-08  1.0247E-05
#      lat0       lon0       xBary       yBary       zBary        JD0
  -13.752142  147.578129    0.979319   -0.036302   -0.149148  2457721.123199
# Heliocentric elements and errors
Epoch:              2457720.5000  =  2016/11/28
Mean Anomaly:          316.84150 +/-   129.749
Argument of Peri:      262.43271 +/-   146.896
Long of Asc Node:      293.02848 +/-     0.226
Inclination:            23.95888 +/-     0.127
Eccentricity:         0.04400538 +/-    0.1080
Semi-Major Axis:     46.58147000 +/-    0.1468
Time of Perihelion: 2471641.8716 +/-   41852.2
Perihelion:          44.53163471 +/-    5.0310
Aphelion:            48.63130528 +/-    5.0313
Period (y)              317.9274 +/-      1.50
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.48022076 +/-    0.0450
Ecliptic Y           24.32410327 +/-    0.0286
Ecliptic Z          -10.69054632 +/-    0.0130
Ecliptic XDOT        -0.00111691 +/-    0.0003
Ecliptic YDOT        -0.00219345 +/-    0.0002
Ecliptic ZDOT        -0.00083806 +/-    0.0001
# Distances at JD0 (AU)
Heliocenter to KBO   45.13043637 +/-    0.0396
Geocenter to KBO     44.96989596 +/-    0.0549
# Hcoef:  7.84

The following table shows the complete astrometric record for 17BN239. 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 (17BN239) followed by the observatory code and reference code for the source of the astrometry.

2016 11  28.62241  09 40 19.73   -00 37 39.0   24.4r 17BN239   T09  C~8Wl8      
2016 11  28.62886  09 40 19.73   -00 37 38.8   24.7r 17BN239   T09  C~8Wl8      
2016 11  28.64865  09 40 19.71   -00 37 39.1   24.8r 17BN239   T09  C~8Wl8      
2017 01  21.36520  09 37 57.86   -00 43 07.4   23.8z 17BN239   T09  C~85Ir      
2017 01  21.36859  09 37 57.85   -00 43 07.2   23.4z 17BN239   T09  C~85Ir      
2017 01  21.37468  09 37 57.82   -00 43 07.1   23.6z 17BN239   T09  C~85Ir      
2017 01  21.39346  09 37 57.73   -00 43 07.1   23.8z 17BN239   T09  C~85Ir      
2017 01  21.62985  09 37 56.76   -00 43 04.7   23.8z 17BN239   T09  C~85Ir      
2017 01  28.38299  09 37 27.91   -00 41 54.8   25.0g 17BN239   T09  C~85Ir      
2017 01  28.38578  09 37 27.89   -00 41 54.8   25.0g 17BN239   T09  C~85Ir      
2017 01  28.39348  09 37 27.86   -00 41 54.8   24.9g 17BN239   T09  C~85Ir      
2017 01  28.40405  09 37 27.81   -00 41 54.6   24.8g 17BN239   T09  C~85Ir      
2017 02  01.50891  09 37 09.71   -00 41 01.5   24.4i 17BN239   T09  C~85Ir      
2017 02  01.55002  09 37 09.53   -00 41 01.0   23.8i 17BN239   T09  C~85Ir      
2017 02  01.57494  09 37 09.42   -00 41 00.8   24.7i 17BN239   T09  C~85Ir      
2017 02  01.57762  09 37 09.39   -00 41 00.5   24.9i 17BN239   T09  C~85Ir      
2017 02  01.62661  09 37 09.18   -00 41 00.1   24.1i 17BN239   T09  C~85Ir      

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     0.07       0.00    -0.25
     2   0.0000     -0.07     0.03       0.19     0.09
     3   0.0001     -0.25    -0.09      -0.19     0.17
     4   0.1471  -1894.08    -0.03   -1024.02    -0.22
     5   0.1471  -1894.29    -0.03   -1023.88    -0.04
     6   0.1472  -1894.75    -0.10   -1023.94    -0.01
     7   0.1472  -1896.02    -0.20   -1024.39    -0.22
     8   0.1479  -1910.53     0.14   -1027.02     0.28
     9   0.1664  -2341.64     0.18   -1106.55     0.17
    10   0.1664  -2341.92     0.08   -1106.65     0.10
    11   0.1664  -2342.34     0.17   -1106.81     0.03
    12   0.1664  -2343.12     0.10   -1106.87     0.09
    13   0.1776  -2616.70    -0.11   -1148.07     0.05
    14   0.1778  -2619.41    -0.00   -1148.50     0.01
    15   0.1778  -2621.04     0.08   -1148.87    -0.12
    16   0.1778  -2621.56    -0.26   -1148.74     0.04
    17   0.1780  -2624.66    -0.03   -1149.42    -0.17

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.

17BN239    quality flag:1

Type:       SCATEXTD  SCATNEAR  SCATEXTD

axisobj        46.361    57.051    46.063
ecceobj         0.036     0.398     0.049
incobj         23.945    23.591    24.150
qmin           44.017    33.570    43.142
qmax           49.017    81.544    49.306
amean          46.403    56.930    46.113
amin           46.044    56.272    45.755
amax           46.776    57.817    46.477
emean           0.038     0.394     0.050
emin            0.028     0.376     0.040
emax            0.048     0.411     0.061
imean          25.549    25.222    25.759
imin           25.330    24.615    25.520
imax           25.766    25.934    25.982
excite_mean     0.433     0.580     0.437
fracstop        1.000     1.000     1.000
cjmean          2.887     2.814     2.879

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       195.6     193.5     184.4
kozaiamp        180.0     179.9     180.0