Orbit Fit and Astrometric record for 95WY2

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: 95WY2     
# Created Tue Dec 12 02:36:59 2017
# Orbit generated from Bernstein formalism
# Fitting   24 observations of   24
# Arc:  21.36y
# First observation: 1995/11/18
#  Last observation: 2017/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.001453   0.020533  -0.000036   0.000594   0.020971   0.000000
# Chi-squared of fit:   171.57 DOF:   42 RMS:  0.47
# Min/Max residuals:    -1.43    1.14
# Exact a, adot, b, bdot, g, gdot:
  1.567739E-05  1.900498E-02  7.355170E-06  5.456746E-04  2.134600E-02 -2.225035E-03
# Covariance matrix:
  1.0697E-13 -3.4309E-14  7.3905E-16 -9.5276E-16  1.7078E-14 -7.7823E-14
 -3.4309E-14  4.1853E-14 -9.5337E-16  1.2342E-15  1.7820E-14  9.9071E-14
  7.3905E-16 -9.5337E-16  8.1798E-14 -4.6880E-15 -2.6824E-17 -2.3871E-15
 -9.5276E-16  1.2342E-15 -4.6880E-15  9.9329E-16  6.6812E-17  3.0838E-15
  1.7078E-14  1.7820E-14 -2.6824E-17  6.6812E-17  2.5120E-13 -5.5213E-15
 -7.7823E-14  9.9071E-14 -2.3871E-15  3.0838E-15 -5.5213E-15  2.4973E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.006267   79.006222    0.384742   -0.000173   -0.915282  2450040.078708
# Heliocentric elements and errors
Epoch:              2450040.5000  =  1995/11/19
Mean Anomaly:          262.14543 +/-     0.039
Argument of Peri:      111.70945 +/-     0.028
Long of Asc Node:       78.73909 +/-     0.001
Inclination:             1.64641 +/-     0.000
Eccentricity:         0.12777642 +/-    0.0000
Semi-Major Axis:     46.23529653 +/-    0.0040
Time of Perihelion: 2481253.6447 +/-      11.8
Perihelion:          40.32751595 +/-    0.0038
Aphelion:            52.14307712 +/-    0.0048
Period (y)              314.3900 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            9.48866740 +/-    0.0002
Ecliptic Y           46.80523092 +/-    0.0011
Ecliptic Z           -0.00477156 +/-    0.0000
Ecliptic XDOT        -0.00243981 +/-    0.0000
Ecliptic YDOT         0.00018608 +/-    0.0000
Ecliptic ZDOT         0.00006982 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.75734994 +/-    0.0011
Geocenter to KBO     46.84719538 +/-    0.0011
# Hcoef:  7.19

The following table shows the complete astrometric record for 95WY2. 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 (95WY2) followed by the observatory code and reference code for the source of the astrometry.

1995 11  18.5780   05 12 10.88   +22 58 40.6   23.4R 95WY2     568  C26040      
1995 11  18.5903   05 12 10.82   +22 58 40.6         95WY2     568  C26040      
1995 11  18.6026   05 12 10.76   +22 58 40.6         95WY2     568  C26040      
1995 11  19.4540   05 12 07.11   +22 58 38.0         95WY2     568  C26040      
1995 11  19.4630   05 12 07.07   +22 58 38.3         95WY2     568  C26040      
1995 11  19.4943   05 12 06.90   +22 58 37.6         95WY2     568  C26040      
1995 11  27.4811   05 11 30.91   +22 57 59.1         95WY2     568  C26040      
1995 11  27.5080   05 11 30.78   +22 57 58.7         95WY2     568  C26040      
1995 11  27.5289   05 11 30.69   +22 57 58.6         95WY2     568  C26040      
1995 12  23.38840  05 09 28.23   +22 55 41.9         95WY2     568  C26491      
1995 12  23.49021  05 09 27.76   +22 55 41.2         95WY2     568  C26491      
1996 09  12.5725   05 19 10.46   +23 07 37.5   24. R 95WY2     568  C27786      
1996 09  13.5467   05 19 11.11   +23 07 39.0         95WY2     568  C27786      
1997 02  10.13579  05 11 15.96   +22 59 56.6         95WY2     697  C29272      
1997 02  10.18933  05 11 15.89   +22 59 56.3         95WY2     697  C29272      
1997 09  05.51484  05 23 41.22   +23 13 35.2         95WY2     675  Ca0008      
1997 09  06.52043  05 23 42.67   +23 13 37.0         95WY2     675  Ca0008      
1997 09  07.50109  05 23 44.01   +23 13 38.9   23.8R 95WY2     675  Ca0008      
2000 12  28.33316  05 32 54.51   +23 26 56.9   23.7R 95WY2     568  Cl2494      
2000 12  28.39865  05 32 54.19   +23 26 56.8   23.3R 95WY2     568  C52847      
2015 02  18.14772  06 39 57.70   +23 43 51.5   23.5R 95WY2     695  C~1M5z      
2015 02  18.19455  06 39 57.56   +23 43 51.7         95WY2     695  C~1M5z      
2017 03  24.24519  06 49 27.166  +23 37 20.46        95WY2     568  C           
2017 03  29.25484  06 49 28.287  +23 37 15.98        95WY2     568  C           

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    -0.33       0.00    -1.43
  2   0.0000     -0.83    -0.40       0.07    -1.37
  3   0.0001     -1.65    -0.48       0.14    -1.30
  4   0.0024    -52.10     0.29       1.70     0.00
  5   0.0024    -52.63     0.32       2.05     0.34
  6   0.0025    -55.02    -0.15       1.54    -0.18
  7   0.0244   -553.54     0.07       4.44     0.27
  8   0.0244   -555.37    -0.00       4.19     0.01
  9   0.0245   -556.61     0.11       4.19     0.01
 10   0.0953  -2253.73    -0.01      12.21     0.07
 11   0.0956  -2260.26     0.13      12.08    -0.09
 12   0.8186   5816.73    -0.04      92.64     0.46
 13   0.8213   5825.78    -0.21      93.51     1.01
 14   1.2308   -749.43    -0.10     138.81    -0.05
 15   1.2310   -750.42     0.31     138.59    -0.28
 16   1.7986   9571.20     0.21     200.95     0.58
 17   1.8013   9591.30     0.19     201.50     0.76
 18   1.8040   9609.90     0.34     202.24     1.14
 19   5.1109  17257.21    -0.04     585.26     0.19
 20   5.1111  17252.77    -0.12     585.36     0.27
 21  19.2514  75614.56    -0.18    2354.10    -0.10
 22  19.2515  75612.37    -0.15    2354.16    -0.01
 23  21.3461  84626.85     0.09    2619.32    -0.04
 24  21.3598  84645.24     0.19    2616.00    -0.17

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.

95WY2    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        46.713    46.725    46.701
ecceobj         0.124     0.124     0.124
incobj          1.644     1.644     1.644
qmin           39.875    39.914    39.899
qmax           53.462    53.470    53.452
amean          46.518    46.530    46.506
amin           46.120    46.138    46.101
amax           46.964    46.972    46.936
emean           0.125     0.125     0.125
emin            0.112     0.113     0.113
emax            0.138     0.139     0.139
imean           0.589     0.589     0.589
imin            0.044     0.048     0.040
imax            0.991     0.990     0.991
excite_mean     0.126     0.126     0.126
fracstop        1.000     1.000     1.000
cjmean          3.113     3.113     3.113

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       180.7     180.6     180.9
kozaiamp        179.9     179.9     180.0