Orbit Fit and Astrometric record for 15DV224

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: 15DV224   
# Created Wed Dec 13 02:38:10 2017
# Orbit generated from Bernstein formalism
# Fitting   20 observations of   20
# Arc:  82.84d
# First observation: 2015/02/23
#  Last observation: 2015/05/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000090   0.070906   0.000113   0.024661   0.043664   0.000000
# Chi-squared of fit:     3.96 DOF:   34 RMS:  0.08
# Min/Max residuals:    -0.23    0.16
# Exact a, adot, b, bdot, g, gdot:
  2.157205E-05  5.656439E-02  1.010592E-05  2.635617E-02  4.162475E-02  1.979657E-02
# Covariance matrix:
  3.6725E-13  9.2966E-13  2.8891E-15  1.1787E-13  8.0460E-13  4.8304E-11
  9.2966E-13  1.4737E-09  9.3863E-12 -1.6879E-10  2.0568E-10 -8.6488E-09
  2.8891E-15  9.3863E-12  3.6371E-13 -2.9598E-12  1.2238E-12 -7.0588E-11
  1.1787E-13 -1.6879E-10 -2.9598E-12  3.6444E-11 -2.0852E-11  1.4448E-09
  8.0460E-13  2.0568E-10  1.2238E-12 -2.0852E-11  3.1861E-11 -7.8089E-10
  4.8304E-11 -8.6488E-09 -7.0588E-11  1.4448E-09 -7.8089E-10  1.1770E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
  -17.686833  177.343146    0.386864   -0.275553   -0.864579  2457076.964808
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:            9.32685 +/-     0.156
Argument of Peri:      277.77752 +/-     0.539
Long of Asc Node:      209.30047 +/-     0.019
Inclination:            29.45359 +/-     0.012
Eccentricity:         0.61451922 +/-    0.0052
Semi-Major Axis:     57.19438925 +/-    0.5660
Time of Perihelion: 2452977.3162 +/-      31.5
Perihelion:          22.04733770 +/-    0.3676
Aphelion:            92.34144081 +/-    0.9606
Period (y)              432.5520 +/-      6.42
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -23.75563901 +/-    0.0031
Ecliptic Y            1.48954503 +/-    0.0001
Ecliptic Z           -7.29865220 +/-    0.0010
Ecliptic XDOT        -0.00194141 +/-    0.0000
Ecliptic YDOT        -0.00364019 +/-    0.0000
Ecliptic ZDOT         0.00125612 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   24.89617346 +/-    0.0030
Geocenter to KBO     24.02417098 +/-    0.0033
# Hcoef:  7.62

The following table shows the complete astrometric record for 15DV224. 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 (15DV224) followed by the observatory code and reference code for the source of the astrometry.

2015 02  23.46403  11 21 30.382  -15 08 23.67  21.7w 15DV224   F51  C~1vYK      
2015 02  23.47553  11 21 30.301  -15 08 23.18  21.5w 15DV224   F51  C~1vYK      
2015 02  23.48703  11 21 30.231  -15 08 22.75  21.6w 15DV224   F51  C~1vYK      
2015 02  23.49853  11 21 30.150  -15 08 22.28  21.5w 15DV224   F51  C~1vYK      
2015 04  10.34692  11 16 25.553  -14 23 03.58  21.8w 15DV224   F51  C~1vYK      
2015 04  10.35754  11 16 25.498  -14 23 02.79  21.6w 15DV224   F51  C~1vYK      
2015 04  10.36817  11 16 25.431  -14 23 02.05  21.8w 15DV224   F51  C~1vYK      
2015 04  10.37882  11 16 25.384  -14 23 01.23  22.2w 15DV224   F51  C~1vYK      
2015 04  16.30100  11 15 54.074  -14 15 56.72  21.6w 15DV224   F51  C~1vYK      
2015 04  16.31185  11 15 54.017  -14 15 55.98  21.5w 15DV224   F51  C~1vYK      
2015 04  16.32270  11 15 53.962  -14 15 54.97  21.7w 15DV224   F51  C~1vYK      
2015 04  16.33358  11 15 53.911  -14 15 54.35  21.6w 15DV224   F51  C~1vYK      
2015 04  18.30133  11 15 44.287  -14 13 32.63  21.7w 15DV224   F51  C~1vYK      
2015 04  18.31196  11 15 44.232  -14 13 32.06  21.8w 15DV224   F51  C~1vYK      
2015 04  18.32260  11 15 44.174  -14 13 31.43  22.0w 15DV224   F51  C~1vYK      
2015 04  18.33321  11 15 44.124  -14 13 30.39  21.7w 15DV224   F51  C~1vYK      
2015 05  17.26828  11 14 16.977  -13 40 26.95  21.7w 15DV224   F51  C~1vYK      
2015 05  17.27989  11 14 16.948  -13 40 26.37  21.7w 15DV224   F51  C~1vYK      
2015 05  17.29148  11 14 16.929  -13 40 25.51  21.7w 15DV224   F51  C~1vYK      
2015 05  17.30310  11 14 16.913  -13 40 24.88  21.7w 15DV224   F51  C~1vYK      

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    -0.02       0.00    -0.02
  2   0.0000     -1.27    -0.06      -0.04    -0.01
  3   0.0001     -2.37     0.06      -0.06     0.02
  4   0.0001     -3.63     0.03      -0.12     0.01
  5   0.1256  -5152.13    -0.09     644.37    -0.04
  6   0.1256  -5153.18    -0.03     644.75     0.02
  7   0.1257  -5154.38    -0.10     645.02    -0.03
  8   0.1257  -5155.34     0.05     645.48     0.11
  9   0.1419  -5746.39     0.01     841.64    -0.04
 10   0.1420  -5747.45     0.02     841.97    -0.08
 11   0.1420  -5748.60    -0.07     842.55     0.14
 12   0.1420  -5749.54     0.06     842.81     0.02
 13   0.1474  -5935.99     0.03     913.24     0.12
 14   0.1474  -5936.96     0.08     913.42    -0.07
 15   0.1475  -5937.99     0.06     913.64    -0.23
 16   0.1475  -5939.08    -0.02     914.28     0.04
 17   0.2267  -7923.29     0.16    2186.64     0.15
 18   0.2267  -7923.92     0.02    2186.99    -0.07
 19   0.2268  -7924.54    -0.11    2187.66     0.02
 20   0.2268  -7925.01    -0.09    2188.13    -0.08

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.

15DV224    quality flag:1

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        56.750    60.170    53.803
ecceobj         0.612     0.637     0.586
incobj         29.463    29.477    29.446
qmin           21.733    21.434    21.915
qmax           92.766    99.165    87.757
amean          55.506    59.260    53.676
amin           53.589    58.037    52.825
amax           57.458    60.490    55.203
emean           0.602     0.631     0.583
emin            0.589     0.620     0.576
emax            0.614     0.640     0.594
imean          30.079    30.049    29.935
imin           29.810    29.644    29.742
imax           30.402    30.451    30.174
excite_mean     0.783     0.805     0.768
fracstop        0.016     0.021     0.019
cjmean          2.430     2.403     2.451

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       282.1     282.8     284.1
kozaiamp          4.7       5.8       7.0