Orbit Fit and Astrometric record for 17QF33

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: 17QF33    
# Created Fri Dec 15 02:38:11 2017
# Orbit generated from Bernstein formalism
# Fitting   23 observations of   23
# Arc:  87.67d
# First observation: 2017/07/01
#  Last observation: 2017/09/27
Preliminary a, adot, b, bdot, g, gdot:
  -0.000496   0.725619  -0.000359  -0.013388   0.202088   0.000000
# Chi-squared of fit:    14.43 DOF:   40 RMS:  0.14
# Min/Max residuals:    -0.32    0.34
# Exact a, adot, b, bdot, g, gdot:
  4.636056E-05  4.533353E-01 -1.790290E-06 -1.462364E-02  1.536343E-01 -1.010875E-01
# Covariance matrix:
  3.3521E-13 -1.4703E-11  2.4226E-14 -2.5141E-13 -1.4675E-12  5.2863E-11
 -1.4703E-11  6.2498E-09 -9.2680E-12  5.9474E-11  9.4499E-10 -8.9676E-09
  2.4226E-14 -9.2680E-12  2.1522E-13 -1.3631E-12 -1.3809E-12  1.4687E-11
 -2.5141E-13  5.9474E-11 -1.3631E-12  1.2181E-11  8.3427E-12 -1.2490E-10
 -1.4675E-12  9.4499E-10 -1.3809E-12  8.3427E-12  1.4621E-10 -1.1771E-09
  5.2863E-11 -8.9676E-09  1.4687E-11 -1.2490E-10 -1.1771E-09  2.3612E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.121936  -44.882211    0.584020    0.045099   -0.825381  2457936.069921
# Heliocentric elements and errors
Epoch:              2457930.5000  =  2017/06/26
Mean Anomaly:          355.41462 +/-     0.010
Argument of Peri:      163.00049 +/-     0.027
Long of Asc Node:      188.15302 +/-     0.008
Inclination:             3.26798 +/-     0.000
Eccentricity:         0.73476877 +/-    0.0004
Semi-Major Axis:     24.90915612 +/-    0.0346
Time of Perihelion: 2458508.8756 +/-       0.2
Perihelion:           6.60668610 +/-    0.0141
Aphelion:            43.21162614 +/-    0.0609
Period (y)              124.3216 +/-      0.26
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            4.77620065 +/-    0.0004
Ecliptic Y           -5.58825499 +/-    0.0004
Ecliptic Z            0.35453433 +/-    0.0000
Ecliptic XDOT         0.00444069 +/-    0.0000
Ecliptic YDOT         0.00697750 +/-    0.0000
Ecliptic ZDOT        -0.00035842 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO    7.35978132 +/-    0.0004
Geocenter to KBO      6.50896187 +/-    0.0005
# Hcoef: 13.33

The following table shows the complete astrometric record for 17QF33. 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 (17QF33) followed by the observatory code and reference code for the source of the astrometry.

2017 07  01.56912  21 06 33.561  -13 18 54.83  22.0w 17QF33    F51  C~2Jz4      
2017 07  01.57883  21 06 33.432  -13 18 55.42  22.3w 17QF33    F51  C~2Jz4      
2017 07  01.58860  21 06 33.317  -13 18 55.72  22.4w 17QF33    F51  C~2Jz4      
2017 07  01.59828  21 06 33.188  -13 18 56.13  22.1w 17QF33    F51  C~2Jz4      
2017 07  15.58441  21 03 11.799  -13 32 14.46  21.4i 17QF33    F51  C~2Jz4      
2017 07  15.59700  21 03 11.554  -13 32 15.54  21.3i 17QF33    F51  C~2Jz4      
2017 07  30.44426  20 58 44.271  -13 51 42.26  22.2w 17QF33    F51  C~2Jz4      
2017 07  30.45523  20 58 44.052  -13 51 43.34  22.0w 17QF33    F51  C~2Jz4      
2017 07  30.46620  20 58 43.834  -13 51 44.23  21.7w 17QF33    F51  C~2Jz4      
2017 07  30.47717  20 58 43.616  -13 51 45.14  21.7w 17QF33    F51  C~2Jz4      
2017 08  16.32286  20 53 21.636  -14 17 04.26  21.5w 17QF33    F51  C~2Jz4      
2017 08  16.33501  20 53 21.421  -14 17 05.42  21.5w 17QF33    F51  C~2Jz4      
2017 08  16.34709  20 53 21.168  -14 17 06.65  21.7w 17QF33    F51  C~2Jz4      
2017 08  16.35913  20 53 20.941  -14 17 07.52  21.8w 17QF33    F51  C~2Jz4      
2017 08  23.346994 20 51 15.175  -14 27 39.94  21.4G 17QF33    568  C~2Jz4      
2017 08  23.348177 20 51 15.154  -14 27 40.07  21.5G 17QF33    568  C~2Jz4      
2017 08  23.349361 20 51 15.133  -14 27 40.18  21.4G 17QF33    568  C~2Jz4      
2017 08  30.27804  20 49 21.34   -14 37 41.0   21.0R 17QF33    291  C~2Jz4      
2017 08  30.32805  20 49 20.56   -14 37 45.5   21.2R 17QF33    291  C~2Jz4      
2017 08  30.37351  20 49 19.84   -14 37 48.9   21.3R 17QF33    291  C~2Jz4      
2017 09  27.17101  20 44 43.64   -15 08 31.2   22.4R 17QF33    291  C~2LVP      
2017 09  27.20697  20 44 43.47   -15 08 32.9   22.1R 17QF33    291  C~2LVP      
2017 09  27.23703  20 44 43.35   -15 08 34.4         17QF33    291  C~2LVP      

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     0.06       0.00     0.06
  2   0.0000     -1.97    -0.09      -0.02    -0.07
  3   0.0001     -3.67     0.05       0.18     0.02
  4   0.0001     -5.59    -0.05       0.33     0.06
  5   0.0384  -3049.50     0.18      82.07     0.07
  6   0.0384  -3053.24    -0.32      82.06    -0.01
  7   0.0791  -7121.98     0.15      70.34     0.15
  8   0.0791  -7125.35     0.06      70.21     0.04
  9   0.0791  -7128.65     0.04      70.25     0.10
 10   0.0791  -7131.96     0.01      70.27     0.15
 11   0.1253 -12065.41     0.03     -80.57    -0.03
 12   0.1253 -12068.74     0.26     -80.83    -0.14
 13   0.1253 -12072.63    -0.08     -80.99    -0.16
 14   0.1254 -12076.05     0.03     -80.91     0.06
 15   0.1445 -14014.73    -0.11    -185.96    -0.17
 16   0.1445 -14015.06    -0.12    -186.00    -0.20
 17   0.1445 -14015.39    -0.12    -186.02    -0.20
 18   0.1635 -15778.04    -0.12    -312.93     0.09
 19   0.1636 -15790.23    -0.00    -314.19    -0.29
 20   0.1637 -15801.27     0.07    -314.62     0.06
 21   0.2398 -20187.10     0.34   -1012.15     0.22
 22   0.2399 -20189.95    -0.09   -1013.13     0.20
 23   0.2400 -20192.05    -0.19   -1014.12     0.02

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.

17QF33    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        24.801    24.883    24.718
ecceobj         0.736     0.736     0.736
incobj          3.280     3.280     3.280
qmin            6.492     6.574     6.431
qmax           48.213    43.191    51.523
amean          25.288    24.313    27.114
amin           23.651    24.000    24.718
amax           27.409    24.883    29.017
emean           0.740     0.729     0.758
emin            0.724     0.725     0.736
emax            0.759     0.736     0.777
imean           3.279     3.324     3.160
imin            3.205     3.181     2.830
imax            3.452     3.401     3.402
excite_mean     0.743     0.731     0.760
fracstop        0.001     0.000     0.001
cjmean          2.422     2.467     2.349

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       176.2     164.4     178.3
kozaiamp         12.1       3.9      18.6