Orbit Fit and Astrometric record for 17OF201

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: 17OF201   
# Created Wed Jul  2 01:11:31 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     19 observations of     19
# Arc:   7.17y
# First observation: 2011/08/31
#  Last observation: 2018/10/31
# Chi-squared of fit:     5.12 DOF:     32 RMS:  0.09
# Min/Max residuals:    -0.22    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.179303E-05  8.682562E-03  1.569629E-06  1.093722E-03  1.229994E-02  7.897510E-03
# Covariance matrix:
  2.8680E-13 -4.8110E-14 -1.8182E-15 -3.6153E-16  1.5585E-13 -1.4848E-13
 -4.8110E-14  1.4102E-13 -5.7896E-15  1.7460E-14  4.4145E-14  2.5728E-12
 -1.8182E-15 -5.7896E-15  1.6238E-13 -2.8303E-14 -5.5906E-15 -1.1880E-13
 -3.6153E-16  1.7460E-14 -2.8303E-14  1.1667E-14  9.0307E-15  3.4603E-13
  1.5585E-13  4.4145E-14 -5.5906E-15  9.0307E-15  2.3283E-13  1.2032E-12
 -1.4848E-13  2.5728E-12 -1.1880E-13  3.4603E-13  1.2032E-12  5.0789E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   14.583720   31.878571    0.818632    0.147380   -0.566595  2455804.977065
# Heliocentric elements and errors
Epoch:              2455804.5000  =  2011/08/31
Mean Anomaly:            1.02621 +/-     0.027
Argument of Peri:      338.26923 +/-     0.008
Long of Asc Node:      328.52322 +/-     0.002
Inclination:            16.19511 +/-     0.000
Eccentricity:         0.95135840 +/-    0.0009
Semi-Major Axis:    928.02721112 +/-   16.4990
Time of Perihelion: 2426368.8930 +/-    1109.6
Perihelion:          45.14072853 +/-    1.1469
Aphelion:          1810.91369371 +/-   32.2060
Period (y)            28271.5271 +/-    753.94
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           67.74677661 +/-    0.0026
Ecliptic Y           41.16901183 +/-    0.0016
Ecliptic Z           20.47133982 +/-    0.0008
Ecliptic XDOT         0.00036877 +/-    0.0000
Ecliptic YDOT         0.00251265 +/-    0.0000
Ecliptic ZDOT         0.00067830 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   81.87463345 +/-    0.0023
Geocenter to KBO     81.30042586 +/-    0.0032
# Hcoef:  3.42

The following table shows the complete astrometric record for 17OF201. 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 (17OF201) followed by the observatory code and reference code for the source of the astrometry.

2011 08  31.476299 01 36 40.144  +25 44 31.95  22.6r 17OF201   T14  C~8uae      
2011 08  31.519310 01 36 40.074  +25 44 32.08  22.6r 17OF201   T14  C~8uae      
2011 08  31.562477 01 36 39.996  +25 44 32.11  22.6r 17OF201   T14  C~8uae      
2011 09  05.489622 01 36 31.220  +25 44 32.41  22.5r 17OF201   T14  C~8uae      
2011 11  24.380755 01 33 14.889  +25 29 41.15  22.5r 17OF201   T14  C~8uae      
2011 11  30.385904 01 33 02.846  +25 27 58.06  22.6r 17OF201   T14  C~8uae      
2011 11  30.402316 01 33 02.814  +25 27 57.75  22.6r 17OF201   T14  C~8uae      
2011 12  01.397649 01 33 00.946  +25 27 40.74  22.6r 17OF201   T14  C~8uae      
2012 01  28.248319 01 32 30.863  +25 15 22.20  22.6r 17OF201   T14  C~8uae      
2014 08  13.412699 01 42 46.672  +26 25 58.51  21.7z 17OF201   W84  C~8uae      
2015 10  11.221651 01 42 46.775  +26 37 44.50  22.5r 17OF201   W84  C~8uae      
2015 10  11.223392 01 42 46.783  +26 37 44.42  23.7g 17OF201   W84  C~8uae      
2017 07  23.439114 01 48 22.616  +27 02 09.48  21.7z 17OF201   W84  C~8uae      
2017 09  17.306714 01 47 24.008  +27 06 52.60  22.7r 17OF201   W84  C~8uae      
2017 11  12.139200 01 45 04.120  +26 57 08.36  24.3g 17OF201   W84  C~8uae      
2018 07  26.429138 01 50 10.026  +27 15 20.25  22.0z 17OF201   W84  C~8uae      
2018 08  10.385365 01 50 06.204  +27 17 54.30  23.4g 17OF201   W84  C~8uae      
2018 08  11.374840 01 50 05.580  +27 18 02.49  22.6r 17OF201   W84  C~8uae      
2018 10  31.169804 01 47 24.018  +27 13 04.03  22.6r 17OF201   W84  C~8uae      

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    -0.12       0.00    -0.08
     2   0.0001      0.00    -0.05       0.00     0.01
     3   0.0002      0.00    -0.10       0.00    -0.00
     4   0.0137      0.00    -0.02       0.00     0.01
     5   0.2325      0.00     0.03       0.00    -0.03
     6   0.2489      0.00     0.02       0.00     0.02
     7   0.2489      0.00     0.02       0.00    -0.01
     8   0.2517      0.00     0.06       0.00    -0.01
     9   0.4101      0.00     0.07       0.00    -0.04
    10   2.9512      0.00    -0.01       0.00    -0.05
    11   4.1116      0.00    -0.11       0.00     0.20
    12   4.1116      0.00     0.08       0.00     0.14
    13   5.8945      0.00     0.29       0.00     0.03
    14   6.0474      0.00     0.02       0.00    -0.05
    15   6.2003      0.00    -0.08       0.00    -0.00
    16   6.9020      0.00    -0.01       0.00    -0.02
    17   6.9429      0.00     0.05       0.00    -0.16
    18   6.9456      0.00     0.07       0.00    -0.06
    19   7.1669      0.00    -0.22       0.00     0.09

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.

17OF201    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       956.389   956.536   956.241
ecceobj         0.953     0.953     0.953
incobj         16.192    16.192    16.192
qmin           37.329    37.009    36.786
qmax         2026.086  2127.326  2186.790
amean         818.218   849.059   874.791
amin          728.332   744.682   780.782
amax         1035.514  1086.135  1115.885
emean           0.945     0.947     0.948
emin            0.934     0.936     0.937
emax            0.957     0.959     0.960
imean          17.477    17.473    17.476
imin           16.076    16.005    15.964
imax           19.096    19.260    19.249
excite_mean     0.992     0.993     0.995
fracstop        1.000     1.000     1.000
cjmean          3.288     3.288     3.289

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       339.8     339.6     339.6
kozaiamp          3.9       3.7       3.7