Orbit Fit and Astrometric record for 99XY143

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: 99XY143   
# Created Mon Dec 18 02:37:01 2017
# Orbit generated from Bernstein formalism
# Fitting   27 observations of   29
# Arc:  15.90y
# First observation: 1999/12/14
#  Last observation: 2015/11/08
Preliminary a, adot, b, bdot, g, gdot:
  -0.000956   0.022410   0.000087  -0.002786   0.020279   0.000000
# Chi-squared of fit:    47.53 DOF:   48 RMS:  0.23
# Min/Max residuals:    -0.92    0.58
# Exact a, adot, b, bdot, g, gdot:
  1.469691E-05  2.209277E-02 -1.466555E-06 -2.775757E-03  2.354242E-02  1.754167E-03
# Covariance matrix:
  1.7790E-13 -8.0222E-14 -9.2919E-15  7.1444E-15  1.6450E-13 -1.7476E-13
 -8.0222E-14  6.1192E-14  7.6822E-15 -5.9085E-15 -1.3510E-13  1.4451E-13
 -9.2919E-15  7.6822E-15  9.2195E-14 -9.3726E-15 -1.5475E-14  1.9140E-14
  7.1444E-15 -5.9085E-15 -9.3726E-15  2.6255E-15  1.1362E-14 -1.4820E-14
  1.6450E-13 -1.3510E-13 -1.5475E-14  1.1362E-14  5.5880E-13 -2.8394E-13
 -1.7476E-13  1.4451E-13  1.9140E-14 -1.4820E-14 -2.8394E-13  3.6136E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
   -0.238772   77.174380   -0.086780   -0.004285   -0.976938  2451526.807633
# Heliocentric elements and errors
Epoch:              2451520.5000  =  1999/12/08
Mean Anomaly:           87.78852 +/-     0.098
Argument of Peri:       84.61236 +/-     0.078
Long of Asc Node:      255.41836 +/-     0.000
Inclination:             7.14487 +/-     0.000
Eccentricity:         0.08261649 +/-    0.0000
Semi-Major Axis:     43.29925070 +/-    0.0063
Time of Perihelion: 2426142.6854 +/-      27.9
Perihelion:          39.72201874 +/-    0.0058
Aphelion:            46.87648265 +/-    0.0068
Period (y)              284.9238 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            9.56792526 +/-    0.0003
Ecliptic Y           42.39101700 +/-    0.0013
Ecliptic Z           -0.17707066 +/-    0.0000
Ecliptic XDOT        -0.00246540 +/-    0.0000
Ecliptic YDOT         0.00077549 +/-    0.0000
Ecliptic ZDOT        -0.00032356 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.45773660 +/-    0.0013
Geocenter to KBO     42.47652361 +/-    0.0013
# Hcoef:  6.10

The following table shows the complete astrometric record for 99XY143. 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 (99XY143) followed by the observatory code and reference code for the source of the astrometry.

1999 12  14.30689  05 04 21.32   +22 34 59.8         99XY143   696  Ca9036      
1999 12  14.37844  05 04 20.96   +22 34 59.4         99XY143   696  Ca9036      
1999 12  15.26753  05 04 16.35   +22 34 52.6         99XY143   696  Ca9036      
1999 12  15.32744  05 04 16.05   +22 34 51.1         99XY143   696  Ca9036      
1999 12  15.39549  05 04 15.68   +22 34 51.0   22.2R 99XY143   696  Ca9036      
2000 01  30.13781  05 01 01.66   +22 29 21.0         99XY143   705  Cb0065      
2000 01  30.16169  05 01 01.59   +22 29 20.8         99XY143   705  Cb0065      
2000 01  30.19586  05 01 01.49   +22 29 20.7         99XY143   705  Cb0065      
2000 11  26.33981  05 11 21.49   +22 34 38.8   22.2R 99XY143   695  Cc2321      
2000 11  26.42632  05 11 21.06   +22 34 38.2   22.2R 99XY143   695  Cc2321      
2000 11  27.39902  05 11 16.18   +22 34 30.9   22.1R 99XY143   695  Cc2321      
2000 12  28.32366  05 08 38.587  +22 30 34.41        99XY143   568  Cl4098      
2000 12  28.38944  05 08 38.261  +22 30 34.18  22.2R 99XY143   568  Cl4098      
2001 01  25.17501  05 06 43.41   +22 27 36.0   22.0R 99XY143   695  Cc6606      
2001 01  25.27377  05 06 43.08   +22 27 35.4         99XY143   695  Cc6606      
2002 11  05.56857  05 23 54.68   +22 29 10.6   22.0R 99XY143   568  Cl8265      
2002 11  05.60419  05 23 54.53   +22 29 10.5         99XY143   568  Cl8265      
2002 11  06.59353  05 23 50.70   +22 29 04.9         99XY143   568  Cl8265      
2002 11  30.57122  05 22 01.68   +22 26 40.5   21.9R 99XY143   568  Cg7552      
2002 12  01.50466  05 21 56.98   +22 26 34.9         99XY143   568  Cg7552      
2007 11  11.42843  05 50 20.48   +21 57 28.5   20.7R 99XY143   688  Cw6672      
2007 11  11.50277  05 50 20.28   +21 57 26.5         99XY143   688  Cw6672      
2008 09  19.13990  05 56 53.06   +21 52 29.6   23.2R 99XY143   250  S~06AL      
2008 09  19.14615  05 56 53.07   +21 52 29.6         99XY143   250  S~06AL      
2008 09  19.15310  05 56 53.07   +21 52 29.6         99XY143   250  S~06AL      
2008 09  19.20379  05 56 53.13   +21 52 29.4         99XY143   250  S~06AL      
2015 11  08.39140  06 31 53.75   +20 36 51.1   23.3R 99XY143   G37  C~1dc0      
2015 11  08.44084  06 31 53.62   +20 36 51.0         99XY143   G37  C~1dc0      
2015 11  08.50710  06 31 53.42   +20 36 50.8         99XY143   G37  C~1dc0      

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     0.03       0.00    -0.08
  2   0.0002     -5.00     0.26       0.08     0.11
  3   0.0026    -69.21 (  -0.10)     -0.58 (   0.82)
  4   0.0028    -73.49    -0.00      -1.67    -0.19
  5   0.0030    -78.60    -0.16      -1.28     0.31
  6   0.1282  -2786.28     0.11     -64.95     0.06
  7   0.1283  -2787.27     0.07     -65.05    -0.01
  8   0.1284  -2788.66     0.03     -65.01     0.07
  9   0.9529   5795.52     0.04    -543.59     0.14
 10   0.9531   5789.53     0.17    -543.69     0.19
 11   0.9558   5721.51     0.06    -545.28     0.23
 12   1.0404   3524.84     0.11    -592.43    -0.03
 13   1.0406   3520.31     0.12    -592.26     0.22
 14   1.1167   1918.64    -0.16    -626.27     0.25
 15   1.1170   1914.03    -0.25    -626.45     0.19
 16   2.8946  16210.50    -0.01   -1640.96    -0.30
 17   2.8947  16208.41    -0.14   -1640.93    -0.19
 18   2.8974  16154.75    -0.03   -1643.16    -0.34
 19   2.9631  14628.87    -0.23   -1689.21    -0.57
 20   2.9656  14563.16    -0.35   -1690.47    -0.24
 21   7.9100  38543.47 (  -0.65)  -4497.61 (   0.85)
 22   7.9102  38540.55     0.58   -4499.58    -0.92
 23   8.7661  44224.08    -0.07   -4893.94     0.21
 24   8.7662  44224.22    -0.02   -4893.94     0.24
 25   8.7662  44224.22    -0.13   -4893.94     0.26
 26   8.7663  44225.09    -0.02   -4894.16     0.24
 27  15.9017  76259.71    -0.09   -9196.45     0.07
 28  15.9018  76257.64     0.10   -9196.64     0.08
 29  15.9020  76254.47    -0.03   -9196.96     0.01

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.

99XY143    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.303    43.322    43.285
ecceobj         0.083     0.083     0.082
incobj          7.144     7.144     7.144
qmin           38.599    38.606    38.591
qmax           47.729    47.778    47.731
amean          43.059    43.078    43.041
amin           42.711    42.738    42.695
amax           43.424    43.439    43.399
emean           0.084     0.083     0.084
emin            0.068     0.068     0.067
emax            0.100     0.100     0.100
imean           9.108     9.101     9.114
imin            8.297     8.286     8.299
imax            9.920     9.915     9.925
excite_mean     0.179     0.179     0.179
fracstop        1.000     1.000     1.000
cjmean          3.052     3.052     3.052

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       177.7     177.7     177.8
kozaiamp        179.9     179.9     180.0