Orbit Fit and Astrometric record for 04PY117

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: 04PY117   
# Created Thu Dec 14 02:37:22 2017
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:  10.98y
# First observation: 2004/08/15
#  Last observation: 2015/08/10
Preliminary a, adot, b, bdot, g, gdot:
  -0.000619   0.041484   0.000357  -0.017985   0.033204   0.000000
# Chi-squared of fit:    21.14 DOF:   44 RMS:  0.16
# Min/Max residuals:    -0.60    0.37
# Exact a, adot, b, bdot, g, gdot:
  1.804012E-05  4.137656E-02 -8.617890E-06 -1.800450E-02  3.497871E-02  4.783475E-03
# Covariance matrix:
  1.4007E-13 -6.0888E-14 -1.6279E-14  2.1401E-14 -1.4169E-14 -1.0895E-13
 -6.0888E-14  9.2385E-14  3.0959E-14 -3.9724E-14 -6.2426E-14  2.0306E-13
 -1.6279E-14  3.0959E-14  1.1279E-13 -2.5627E-14 -2.5046E-14  7.0712E-14
  2.1401E-14 -3.9724E-14 -2.5627E-14  2.0949E-14  2.9883E-14 -9.0600E-14
 -1.4169E-14 -6.2426E-14 -2.5046E-14  2.9883E-14  2.5689E-13 -1.5473E-13
 -1.0895E-13  2.0306E-13  7.0712E-14 -9.0600E-14 -1.5473E-13  4.6325E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.896341  -48.319351   -0.197311   -0.015545   -0.997369  2453232.854003
# Heliocentric elements and errors
Epoch:              2453230.5000  =  2004/08/13
Mean Anomaly:           16.65474 +/-     0.003
Argument of Peri:      151.96784 +/-     0.004
Long of Asc Node:      130.07362 +/-     0.000
Inclination:            23.58153 +/-     0.000
Eccentricity:         0.27945785 +/-    0.0001
Semi-Major Axis:     39.83973915 +/-    0.0041
Time of Perihelion: 2448981.2870 +/-       0.5
Perihelion:          28.70621140 +/-    0.0039
Aphelion:            50.97326690 +/-    0.0058
Period (y)              251.4681 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           19.81555350 +/-    0.0003
Ecliptic Y          -21.96145953 +/-    0.0003
Ecliptic Z           -0.44744371 +/-    0.0000
Ecliptic XDOT         0.00265117 +/-    0.0000
Ecliptic YDOT         0.00188348 +/-    0.0000
Ecliptic ZDOT        -0.00141482 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   29.58313829 +/-    0.0003
Geocenter to KBO     28.58881937 +/-    0.0004
# Hcoef:  7.34

The following table shows the complete astrometric record for 04PY117. 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 (04PY117) followed by the observatory code and reference code for the source of the astrometry.

2004 08  15.35326  20 57 36.44   -18 08 37.3   21.6g 04PY117   568  C~0X5Y      
2004 08  15.38455  20 57 36.23   -18 08 38.5   22.3g 04PY117   568  C~0X5Y      
2004 08  15.41660  20 57 36.03   -18 08 39.7   21.9g 04PY117   568  C~0X5Y      
2004 08  16.32469  20 57 30.31   -18 09 12.7   21.6g 04PY117   568  C~0X5Y      
2004 10  04.26385  20 53 42.67   -18 32 14.4   21.7i 04PY117   568  C~0X5Y      
2004 10  04.31600  20 53 42.56   -18 32 15.4   22.2i 04PY117   568  C~0X5Y      
2004 10  04.36845  20 53 42.42   -18 32 16.4   21.5i 04PY117   568  C~0X5Y      
2005 07  12.25410  21 11 54.27   -18 05 24.8   21.7R 04PY117   809  C~0X5Y      
2005 07  12.30376  21 11 54.00   -18 05 26.7   22.1R 04PY117   809  C~0X5Y      
2005 07  12.35372  21 11 53.71   -18 05 28.5   21.7R 04PY117   809  C~0X5Y      
2005 07  13.23387  21 11 48.78   -18 06 01.1   22.9R 04PY117   809  C~0X5Y      
2005 08  03.19430  21 09 40.78   -18 19 22.3         04PY117   309  C~0X5Y      
2005 08  03.28468  21 09 40.20   -18 19 25.8         04PY117   309  C~0X5Y      
2005 08  03.34141  21 09 39.83   -18 19 27.9         04PY117   309  C~0X5Y      
2006 05  02.48097  21 24 31.13   -17 53 48.4   20.8r 04PY117   695  C~0X5Y      
2006 05  04.47973  21 24 36.28   -17 53 55.4   20.7r 04PY117   695  C~0X5Y      
2009 06  20.40298  21 55 05.70   -18 38 52.3         04PY117   695  C~0X5Y      
2009 06  20.44233  21 55 05.60   -18 38 53.5         04PY117   695  C~0X5Y      
2009 06  22.39729  21 55 00.52   -18 39 58.9         04PY117   695  C~0X5Y      
2014 09  19.05793  22 37 10.39   -19 50 40.2   22.4V 04PY117   W84  C~2J8r      
2014 09  19.12685  22 37 10.00   -19 50 42.4         04PY117   W84  C~2J8r      
2014 09  19.23350  22 37 09.39   -19 50 45.9         04PY117   W84  C~2J8r      
2015 08  10.48139  22 50 32.872  -19 19 40.31  22.4w 04PY117   F51  C~1VZw      
2015 08  10.49329  22 50 32.820  -19 19 40.50  22.2w 04PY117   F51  C~1VZw      
2015 08  10.50512  22 50 32.746  -19 19 41.70  22.3w 04PY117   F51  C~1VZw      

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     0.14       0.00     0.10
  2   0.0001     -3.21     0.01      -0.32     0.07
  3   0.0002     -6.28     0.09      -0.68     0.01
  4   0.0027    -93.78     0.06      -9.69    -0.10
  5   0.1366  -3590.52    -0.07    -444.23     0.18
  6   0.1368  -3592.30     0.07    -444.77     0.04
  7   0.1369  -3594.49    -0.21    -445.18     0.01
  8   0.9060  11781.61    -0.06   -3337.49     0.12
  9   0.9061  11777.35     0.10   -3338.16    -0.01
 10   0.9062  11772.86     0.03   -3338.65     0.05
 11   0.9086  11695.80    -0.00   -3348.89    -0.05
 12   0.9660   9711.15    -0.08   -3574.90     0.07
 13   0.9663   9702.20     0.05   -3575.82     0.01
 14   0.9664   9696.54     0.06   -3576.27     0.09
 15   1.7115  22356.32     0.20   -5988.71    -0.10
 16   1.7170  22424.82    -0.23   -6018.68    -0.10
 17   4.8461  46880.49     0.10  -17571.34    -0.09
 18   4.8462  46878.65     0.15  -17571.97    -0.02
 19   4.8516  46783.34    -0.52  -17607.87    -0.60
 20  10.0936  82013.85    -0.04  -37098.01     0.03
 21  10.0938  82006.90     0.01  -37097.49     0.04
 22  10.0941  81995.99    -0.08  -37096.74    -0.03
 23  10.9846  95454.26    -0.02  -41040.18     0.09
 24  10.9846  95453.33     0.35  -41039.98     0.37
 25  10.9847  95451.56    -0.12  -41040.64    -0.20

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.

04PY117    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        39.640    39.653    39.628
ecceobj         0.275     0.275     0.274
incobj         23.560    23.560    23.560
qmin           25.198    27.117    25.616
qmax           53.529    57.043    56.636
amean          39.234    41.254    40.744
amin           37.826    39.653    38.766
amax           40.452    42.954    42.013
emean           0.297     0.321     0.344
emin            0.223     0.273     0.264
emax            0.352     0.344     0.373
imean          19.535    19.860    18.283
imin           17.242    19.242    16.816
imax           22.109    22.109    22.109
excite_mean     0.449     0.468     0.467
fracstop        0.167     0.150     0.101
cjmean          2.821     2.821     2.815

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       208.3     179.3     174.3
kozaiamp         92.3      37.1      34.4