Orbit Fit and Astrometric record for 17BQ236

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: 17BQ236   
# Created Tue Apr  1 01:11:01 2025
# Orbit generated from Bernstein formalism
# Fitting     22 observations of     22
# Arc:   1.87y
# First observation: 2015/03/22
#  Last observation: 2017/02/01
Preliminary a, adot, b, bdot, g, gdot:
  -0.000210   0.030737  -0.000009   0.008166   0.026818   0.000000
# Chi-squared of fit:     9.30 DOF:     38 RMS:  0.11
# Min/Max residuals:    -0.21    0.31
# Exact a, adot, b, bdot, g, gdot:
  1.648524E-05  2.970100E-02  4.357565E-06  8.097267E-03  2.777179E-02 -4.163741E-03
# Covariance matrix:
  2.9221E-13 -4.0410E-13  4.2877E-15 -5.9527E-14 -1.4954E-13 -3.9457E-12
 -4.0410E-13  3.5690E-12 -6.8277E-14  8.8087E-13  2.5826E-12  5.8028E-11
  4.2877E-15 -6.8277E-14  2.7480E-13 -1.7422E-13 -7.3253E-14 -1.2965E-12
 -5.9527E-14  8.8087E-13 -1.7422E-13  3.5553E-13  8.0118E-13  1.5758E-11
 -1.4954E-13  2.5826E-12 -7.3253E-14  8.0118E-13  3.2029E-12  5.1947E-11
 -3.9457E-12  5.8028E-11 -1.2965E-12  1.5758E-11  5.1947E-11  1.0325E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -13.902806  141.360210   -0.636826   -0.183018   -0.739939  2457103.877264
# Heliocentric elements and errors
Epoch:              2457100.5000  =  2015/03/19
Mean Anomaly:          332.58755 +/-     0.139
Argument of Peri:      358.94048 +/-     0.238
Long of Asc Node:      182.78509 +/-     0.001
Inclination:            20.48920 +/-     0.001
Eccentricity:         0.20485781 +/-    0.0009
Semi-Major Axis:     44.28043175 +/-    0.0246
Time of Perihelion: 2465295.7362 +/-      40.9
Perihelion:          35.20923938 +/-    0.0439
Aphelion:            53.35162411 +/-    0.0492
Period (y)              294.6632 +/-      0.25
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -28.29781584 +/-    0.0018
Ecliptic Y           21.80387921 +/-    0.0014
Ecliptic Z           -8.65162025 +/-    0.0006
Ecliptic XDOT        -0.00167030 +/-    0.0000
Ecliptic YDOT        -0.00242189 +/-    0.0000
Ecliptic ZDOT         0.00087359 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.75630644 +/-    0.0016
Geocenter to KBO     36.00775726 +/-    0.0023
# Hcoef:  8.44

The following table shows the complete astrometric record for 17BQ236. 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 (17BQ236) followed by the observatory code and reference code for the source of the astrometry.

2015 03  22.376486 09 17 16.90   +01 11 00.9         17BQ236   T09  C~81Bo      
2015 03  22.40027  09 17 16.81   +01 11 01.8   23.8i 17BQ236   T09  C~8ifL      
2015 03  22.43327  09 17 16.69   +01 11 03.0   23.6i 17BQ236   T09  C~8ifL      
2015 03  22.43873  09 17 16.67   +01 11 03.2   23.7i 17BQ236   T09  C~8ifL      
2015 03  22.453542 09 17 16.63   +01 11 03.7         17BQ236   T09  C~81Bo      
2016 04  04.246919 09 23 41.56   +01 13 56.0         17BQ236   T09  C~81Bo      
2016 04  04.268116 09 23 41.51   +01 13 56.7         17BQ236   T09  C~81Bo      
2016 11  28.52757  09 38 52.83   +00 25 57.9   24.9r 17BQ236   T09  C~81Bo      
2016 11  28.62241  09 38 52.79   +00 25 56.2   24.6r 17BQ236   T09  C~81Bo      
2016 11  28.63517  09 38 52.78   +00 25 56.2   25.4r 17BQ236   T09  C~81Bo      
2017 01  21.37198  09 36 16.69   +00 28 03.7   23.4z 17BQ236   T09  C~81Bo      
2017 01  21.39613  09 36 16.56   +00 28 04.1   23.5z 17BQ236   T09  C~81Bo      
2017 01  21.40419  09 36 16.52   +00 28 04.2   22.9z 17BQ236   T09  C~81Bo      
2017 01  21.41223  09 36 16.47   +00 28 04.4   23.4z 17BQ236   T09  C~81Bo      
2017 01  28.39139  09 35 42.16   +00 30 39.3   24.8g 17BQ236   T09  C~81Bo      
2017 01  28.40825  09 35 42.09   +00 30 39.6   24.7g 17BQ236   T09  C~81Bo      
2017 01  28.41463  09 35 42.05   +00 30 40.0   24.5g 17BQ236   T09  C~81Bo      
2017 01  28.41673  09 35 42.03   +00 30 39.6   24.6g 17BQ236   T09  C~81Bo      
2017 02  01.48410  09 35 21.37   +00 32 22.1   23.8i 17BQ236   T09  C~81Bo      
2017 02  01.51446  09 35 21.21   +00 32 23.1   23.7i 17BQ236   T09  C~81Bo      
2017 02  01.52538  09 35 21.15   +00 32 23.5   23.7i 17BQ236   T09  C~81Bo      
2017 02  01.55545  09 35 21.00   +00 32 24.5   23.6i 17BQ236   T09  C~81Bo      

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     0.09       0.00     0.05
     2   0.0001     -1.56    -0.01       0.44     0.03
     3   0.0002     -3.65    -0.08       1.02    -0.02
     4   0.0002     -3.99    -0.09       1.11    -0.02
     5   0.0002     -4.72     0.09       1.40    -0.02
     6   1.0373   5429.42    -0.02    1961.22    -0.01
     7   1.0373   5428.49     0.03    1961.65    -0.05
     8   1.6897  19370.30    -0.08    3496.52     0.08
     9   1.6899  19370.26     0.11    3494.71    -0.10
    10   1.6900  19370.11     0.00    3494.66     0.08
    11   1.8371  17087.51     0.13    2881.33     0.00
    12   1.8372  17085.52    -0.03    2881.10    -0.14
    13   1.8372  17084.91    -0.02    2881.01    -0.20
    14   1.8372  17084.13    -0.19    2880.96    -0.21
    15   1.8563  16543.23    -0.10    2867.27     0.14
    16   1.8563  16542.13     0.17    2867.23     0.11
    17   1.8564  16541.43    -0.01    2867.42     0.31
    18   1.8564  16541.27    -0.01    2866.94    -0.16
    19   1.8675  16212.78     0.10    2867.50    -0.21
    20   1.8676  16210.18     0.02    2867.70    -0.03
    21   1.8676  16209.19    -0.06    2867.80     0.07
    22   1.8677  16206.73    -0.03    2868.05     0.30

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.

17BQ236    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        44.016    44.068    43.964
ecceobj         0.198     0.200     0.196
incobj         20.536    20.536    20.536
qmin           33.730    33.583    33.699
qmax           54.845    54.937    54.629
amean          44.013    44.025    43.918
amin           43.602    43.592    43.486
amax           44.521    44.495    44.382
emean           0.211     0.213     0.208
emin            0.191     0.191     0.186
emax            0.233     0.236     0.231
imean          20.090    20.102    20.019
imin           19.274    19.288    19.192
imax           20.930    20.938    20.922
excite_mean     0.403     0.405     0.401
fracstop        1.000     1.000     1.000
cjmean          2.903     2.902     2.905

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       170.3     169.4     175.6
kozaiamp        180.0     180.0     180.0