Orbit Fit and Astrometric record for 02VD138

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: 02VD138   
# Created Thu Dec 14 02:37:14 2017
# Orbit generated from Bernstein formalism
# Fitting   15 observations of   16
# Arc:   9.02y
# First observation: 1999/10/14
#  Last observation: 2008/10/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000289   0.033642  -0.000009   0.000367   0.030973   0.000000
# Chi-squared of fit:    21.42 DOF:   24 RMS:  0.21
# Min/Max residuals:    -0.51    0.45
# Exact a, adot, b, bdot, g, gdot:
  1.827098E-05  3.359661E-02  8.470591E-07  3.615169E-04  2.974684E-02  2.877224E-03
# Covariance matrix:
  4.7352E-13 -1.4488E-13  1.6338E-15 -1.1192E-15  8.2698E-14 -3.2862E-13
 -1.4488E-13  1.5475E-13 -1.1117E-15  1.4597E-15  3.4431E-13  4.7512E-13
  1.6338E-15 -1.1117E-15  3.2827E-13 -4.9961E-14  7.1642E-16 -3.8356E-15
 -1.1192E-15  1.4597E-15 -4.9961E-14  1.0842E-14  2.9060E-15  4.8475E-15
  8.2698E-14  3.4431E-13  7.1642E-16  2.9060E-15  1.9851E-12  1.0796E-12
 -3.2862E-13  4.7512E-13 -3.8356E-15  4.8475E-15  1.0796E-12  1.5713E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.786955   32.217651    0.199090    0.046922   -0.968379  2451465.867849
# Heliocentric elements and errors
Epoch:              2451460.5000  =  1999/10/09
Mean Anomaly:           26.11413 +/-     0.026
Argument of Peri:       41.25356 +/-     0.035
Long of Asc Node:      315.14189 +/-     0.004
Inclination:             2.78231 +/-     0.000
Eccentricity:         0.15442998 +/-    0.0001
Semi-Major Axis:     39.89392777 +/-    0.0083
Time of Perihelion: 2444784.2646 +/-       6.2
Perihelion:          33.73310912 +/-    0.0083
Aphelion:            46.05474643 +/-    0.0106
Period (y)              251.9813 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           29.34091642 +/-    0.0013
Ecliptic Y           18.25242650 +/-    0.0008
Ecliptic Z            1.63457340 +/-    0.0001
Ecliptic XDOT        -0.00143071 +/-    0.0000
Ecliptic YDOT         0.00276431 +/-    0.0000
Ecliptic ZDOT         0.00004619 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.59352945 +/-    0.0012
Geocenter to KBO     33.61701876 +/-    0.0016
# Hcoef:  8.44

The following table shows the complete astrometric record for 02VD138. 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 (02VD138) followed by the observatory code and reference code for the source of the astrometry.

1999 10  14.367106 01 56 10.17   +14 51 29.8         02VD138   645  C~1ReC      
1999 10  14.367935 01 56 10.17   +14 51 29.8         02VD138   645  C~1ReC      
1999 10  14.370423 01 56 10.16   +14 51 29.8         02VD138   645  C~1ReC      
2002 11  09.23726  02 16 06.22   +16 38 36.7   22.9R 02VD138   695  Cl9844      
2002 11  09.33793  02 16 05.64   +16 38 34.1         02VD138   695  Cl9844      
2002 12  05.09440  02 13 55.63   +16 26 44.8   22.8R 02VD138   695  Cl9844      
2002 12  05.20580  02 13 55.15   +16 26 42.4         02VD138   695  Cl9844      
2004 10  15.33394  02 33 18.27   +18 03 08.4   23.0R 02VD138   695  Cl9844      
2004 10  15.44501  02 33 17.71   +18 03 06.2         02VD138   695  Cl9844      
2004 11  09.19997  02 30 57.52   +17 52 20.7   22.6R 02VD138   695  Cl9844      
2004 11  09.29232  02 30 56.95   +17 52 17.7         02VD138   695  Cl9844      
2004 11  10.27544  02 30 51.37   +17 51 51.0         02VD138   695  Cl9844      
2007 11  09.25365  02 53 21.88   +19 33 43.3         02VD138   695  Cy3992      
2007 11  09.34002  02 53 21.36   +19 33 41.0         02VD138   695  Cy3992      
2008 10  22.26679  03 02 27.20   +20 11 12.0   25.4r 02VD138   695  C~0gM1      
2008 10  22.29860  03 02 27.02   +20 11 11.1   24.9r 02VD138   695  C~0gM1      

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    -0.08       0.00    -0.14
  2   0.0000      0.00    -0.01       0.00    -0.14
  3   0.0000     -0.14     0.07       0.05    -0.09
  4   3.0715  18470.94     0.45     227.04     0.33
  5   3.0718  18462.14 (   0.45)    227.30 (   0.67)
  6   3.1423  16449.21    -0.24     168.47    -0.15
  7   3.1426  16441.86    -0.03     168.47     0.15
  8   5.0047  34355.57    -0.51     380.93    -0.18
  9   5.0050  34347.07     0.33     381.27     0.01
 10   5.0728  32190.44     0.29     378.94     0.24
 11   5.0730  32181.56    -0.34     378.58    -0.05
 12   5.0757  32095.51    -0.02     377.67     0.31
 13   8.0709  53102.91     0.17     609.60     0.04
 14   8.0711  53094.70    -0.01     609.42    -0.07
 15   9.0237  61738.95     0.03     694.13    -0.01
 16   9.0238  61736.03    -0.10     693.92    -0.25

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.

02VD138    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.886    39.911    39.861
ecceobj         0.154     0.154     0.154
incobj          2.783     2.783     2.783
qmin           33.080    33.108    33.058
qmax           46.226    46.228    46.255
amean          39.458    39.458    39.457
amin           39.060    39.041    39.093
amax           39.887    39.922    39.879
emean           0.142     0.142     0.143
emin            0.127     0.125     0.127
emax            0.159     0.160     0.160
imean           4.157     4.111     4.177
imin            3.513     3.517     3.524
imax            4.745     4.765     4.801
excite_mean     0.160     0.159     0.160
fracstop        1.000     1.000     1.000
cjmean          3.023     3.023     3.023

libcent 0       180.8     179.5     179.4
libamp  0        61.1      74.6      48.4
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       181.3     180.2     183.4
kozaiamp        180.0     179.9     180.0