Orbit Fit and Astrometric record for 02PU170

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: 02PU170   
# Created Mon Oct 23 01:37:20 2017
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:  12.14y
# First observation: 2002/08/05
#  Last observation: 2014/09/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.001872   0.020711  -0.000056   0.000698   0.019714   0.000000
# Chi-squared of fit:    97.85 DOF:   44 RMS:  0.35
# Min/Max residuals:    -0.74    0.77
# Exact a, adot, b, bdot, g, gdot:
  1.182982E-05  1.945018E-02 -3.082597E-06  6.504116E-04  2.164567E-02 -4.313024E-03
# Covariance matrix:
  2.4540E-13 -1.1221E-13  3.9218E-15 -3.8390E-15  1.9613E-13 -4.5392E-13
 -1.1221E-13  7.9166E-14 -2.8859E-15  2.8172E-15 -9.3117E-14  3.3253E-13
  3.9218E-15 -2.8859E-15  9.1067E-14 -1.1359E-14  3.7823E-15 -1.2749E-14
 -3.8390E-15  2.8172E-15 -1.1359E-14  3.8369E-15 -3.7316E-15  1.2450E-14
  1.9613E-13 -9.3117E-14  3.7823E-15 -3.7316E-15  3.7955E-13 -4.4335E-13
 -4.5392E-13  3.3253E-13 -1.2749E-14  1.2450E-14 -4.4335E-13  1.4700E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.078210  -32.893771    0.255009   -0.001410   -0.986045  2452491.923773
# Heliocentric elements and errors
Epoch:              2452490.5000  =  2002/08/04
Mean Anomaly:          285.24758 +/-     0.015
Argument of Peri:       98.30953 +/-     0.024
Long of Asc Node:      329.08118 +/-     0.000
Inclination:             1.92872 +/-     0.000
Eccentricity:         0.22420835 +/-    0.0001
Semi-Major Axis:     47.63266307 +/-    0.0054
Time of Perihelion: 2477423.7250 +/-       2.5
Perihelion:          36.95302239 +/-    0.0050
Aphelion:            58.31230375 +/-    0.0072
Period (y)              328.7498 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           39.48149419 +/-    0.0011
Ecliptic Y          -25.83357541 +/-    0.0007
Ecliptic Z           -0.06317544 +/-    0.0000
Ecliptic XDOT         0.00087031 +/-    0.0000
Ecliptic YDOT         0.00235937 +/-    0.0000
Ecliptic ZDOT         0.00008322 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.18226355 +/-    0.0010
Geocenter to KBO     46.19862603 +/-    0.0013
# Hcoef:  7.06

The following table shows the complete astrometric record for 02PU170. 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 (02PU170) followed by the observatory code and reference code for the source of the astrometry.

2002 08  05.42303  21 57 22.16   -12 32 57.2   23.2R 02PU170   568  Cp2009      
2002 08  05.48562  21 57 21.90   -12 32 58.5   23.7R 02PU170   568  Cp2009      
2002 08  05.54820  21 57 21.63   -12 33 00.1   23.5R 02PU170   568  Cp2009      
2002 08  08.44795  21 57 09.87   -12 34 02.1         02PU170   568  Cp2009      
2002 09  03.97196  21 55 20.10   -12 43 35.3         02PU170   950  Cp2009      
2002 09  04.01127  21 55 19.97   -12 43 36.1         02PU170   950  Cp2009      
2002 09  04.05201  21 55 19.78   -12 43 36.7   23.4R 02PU170   950  Cp2009      
2002 09  30.24743  21 53 46.07   -12 51 39.9   23.4R 02PU170   568  Cp2009      
2002 09  30.30449  21 53 45.90   -12 51 40.9   23.2R 02PU170   568  Cp2009      
2002 09  30.36635  21 53 45.71   -12 51 41.8   23.3R 02PU170   568  Cp2009      
2003 10  29.04176  21 56 58.52   -12 32 04.9         02PU170   309  Cp2009      
2003 10  29.11922  21 56 58.44   -12 32 05.3         02PU170   309  Cp2009      
2004 08  12.39657  22 05 21.84   -11 44 54.9   23.7R 02PU170   568  Cp2009      
2004 08  12.42677  22 05 21.71   -11 44 55.8   24.0R 02PU170   568  Cp2009      
2004 08  12.46130  22 05 21.57   -11 44 56.4   23.7R 02PU170   568  Cp2009      
2005 07  08.52640  22 11 44.19   -11 07 31.2   23.4r 02PU170   568  Cp2009      
2005 07  08.56812  22 11 44.08   -11 07 31.8   23.6r 02PU170   568  Cp2009      
2005 07  09.54830  22 11 41.35   -11 07 46.5   23.5r 02PU170   568  Cp2009      
2006 07  30.43492  22 14 51.51   -10 47 25.8   23.0R 02PU170   250  S~06AX      
2006 07  30.43931  22 14 51.49   -10 47 25.9         02PU170   250  S~06AX      
2006 07  30.44371  22 14 51.48   -10 47 26.0         02PU170   250  S~06AX      
2006 07  30.44811  22 14 51.46   -10 47 26.1         02PU170   250  S~06AX      
2014 09  26.20576  22 46 33.71   -07 20 50.1   23.1R 02PU170   695  C~1LJ9      
2014 09  26.26612  22 46 33.49   -07 20 51.3         02PU170   695  C~1LJ9      
2014 09  26.32350  22 46 33.27   -07 20 53.0         02PU170   695  C~1LJ9      

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     0.49       0.00     0.73
  2   0.0002     -4.02     0.45       0.08     0.77
  3   0.0003     -8.28     0.17      -0.07     0.57
  4   0.0083   -191.28    -0.04       0.57     0.24
  5   0.0809  -1897.10    -0.41       9.90    -0.28
  6   0.0810  -1899.17     0.03       9.80    -0.41
  7   0.0811  -1901.98    -0.21      10.18    -0.06
  8   0.1528  -3355.61    -0.12      21.27     0.21
  9   0.1530  -3358.29    -0.10      21.17     0.07
 10   0.1532  -3361.21    -0.10      21.26     0.11
 11   1.2310   -307.38     0.20     167.53     0.11
 12   1.2312   -308.62     0.31     167.55     0.07
 13   2.0205   7600.14    -0.29     273.34    -0.06
 14   2.0205   7598.03    -0.41     273.16    -0.26
 15   2.0206   7595.89    -0.28     273.32    -0.13
 16   2.9243  13667.97    -0.31     397.23     0.08
 17   2.9244  13666.24    -0.19     397.24     0.06
 18   2.9271  13623.27    -0.23     397.72     0.16
 19   3.9836  16691.21     0.29     544.02    -0.70
 20   3.9836  16690.89     0.24     544.04    -0.69
 21   3.9836  16690.72     0.33     543.99    -0.74
 22   3.9836  16690.41     0.27     544.01    -0.73
 23  12.1418  48264.23    -0.23    1750.22     0.36
 24  12.1419  48260.55     0.11    1750.34     0.45
 25  12.1421  48256.68     0.04    1749.98     0.06

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.

02PU170    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        48.027    48.043    48.010
ecceobj         0.225     0.225     0.225
incobj          1.918     1.918     1.918
qmin           36.553    36.613    36.540
qmax           59.956    60.036    60.046
amean          47.797    47.797    47.797
amin           47.143    47.134    47.132
amax           48.543    48.555    48.559
emean           0.219     0.218     0.219
emin            0.202     0.201     0.203
emax            0.235     0.237     0.237
imean           3.129     3.123     3.129
imin            2.719     2.719     2.717
imax            3.585     3.557     3.564
excite_mean     0.225     0.225     0.226
fracstop        1.000     1.000     1.000
cjmean          3.085     3.085     3.084

libcent 0       180.5     180.2     180.0
libamp  0       152.5     151.6     152.3
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       162.5     162.2     162.2
kozaiamp        179.9     179.9     180.0