Orbit Fit and Astrometric record for 98XY95

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: 98XY95    
# Created Fri Mar 22 01:07:26 2019
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   91 observations of   91
# Arc:  19.09y
# First observation: 1998/12/12
#  Last observation: 2018/01/15
# Chi-squared of fit:   649.87 DOF:  176 RMS:  0.47
# Min/Max residuals:    -1.54    1.68
# Exact a, adot, b, bdot, g, gdot:
  1.742893E-05  2.515677E-02  6.637237E-06  2.480463E-03  2.378597E-02 -7.230731E-03
# Covariance matrix:
  5.7691E-14 -8.7287E-15  8.5985E-16 -5.9968E-16  1.3770E-14 -1.1660E-14
 -8.7287E-15  6.1367E-15 -6.1694E-16  5.9261E-16  1.3534E-15  1.1135E-14
  8.5985E-16 -6.1694E-16  4.8242E-14 -3.0110E-15  8.5340E-16 -1.2147E-15
 -5.9968E-16  5.9261E-16 -3.0110E-15  3.0947E-16  6.6752E-17  1.1243E-15
  1.3770E-14  1.3534E-15  8.5340E-16  6.6752E-17  5.9471E-14 -2.8050E-16
 -1.1660E-14  1.1135E-14 -1.2147E-15  1.1243E-15 -2.8050E-16  2.1199E-14
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.695123   80.019194   -0.019878    0.063153   -0.981487  2451160.415971
# Heliocentric elements and errors
Epoch:              2451160.5000  =  1998/12/13
Mean Anomaly:          336.96705 +/-     0.003
Argument of Peri:       89.16536 +/-     0.004
Long of Asc Node:       47.27297 +/-     0.000
Inclination:             6.65154 +/-     0.000
Eccentricity:         0.41926605 +/-    0.0000
Semi-Major Axis:     64.36657172 +/-    0.0045
Time of Perihelion: 2463228.5224 +/-      18.6
Perihelion:          37.37985331 +/-    0.0032
Aphelion:            91.35329014 +/-    0.0067
Period (y)              516.4149 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            7.42995346 +/-    0.0001
Ecliptic Y           42.29097064 +/-    0.0004
Ecliptic Z            2.70976010 +/-    0.0000
Ecliptic XDOT        -0.00299986 +/-    0.0000
Ecliptic YDOT        -0.00032514 +/-    0.0000
Ecliptic ZDOT         0.00023126 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.02429955 +/-    0.0004
Geocenter to KBO     42.04182785 +/-    0.0004
# Hcoef:  6.32

The following table shows the complete astrometric record for 98XY95. 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 (98XY95) followed by the observatory code and reference code for the source of the astrometry.

1998 12  12.91524  05 15 19.72   +26 44 53.9   22.2R 98XY95    950  Ca3641      
1998 12  13.02631  05 15 19.18   +26 44 53.6   21.6R 98XY95    950  Ca3641      
1998 12  13.07074  05 15 18.93   +26 44 53.5         98XY95    950  Ca3641      
1998 12  13.86534  05 15 14.68   +26 44 50.0         98XY95    950  Ca3641      
1998 12  14.19124  05 15 12.93   +26 44 48.6         98XY95    950  Ca3641      
1999 01  18.10075  05 12 24.30   +26 41 32.2         98XY95    709  Ca7793      
1999 01  19.12019  05 12 20.28   +26 41 25.1   23.6R 98XY95    709  Ca3641      
1999 01  19.16583  05 12 20.02   +26 41 25.3   22.1R 98XY95    709  Ca3641      
1999 01  19.21161  05 12 19.97   +26 41 24.0   22.5R 98XY95    709  Ca3641      
1999 01  19.25780  05 12 19.70   +26 41 24.7   22.1R 98XY95    709  Ca3641      
1999 02  09.11133  05 11 17.13   +26 39 17.6   21.2R 98XY95    709  Ca7793      
1999 02  09.13961  05 11 16.97   +26 39 17.4   21.5R 98XY95    709  Ca7793      
1999 02  09.15659  05 11 16.97   +26 39 17.6   21.3R 98XY95    709  Ca7793      
1999 02  09.19602  05 11 16.95   +26 39 18.2   22.3R 98XY95    709  Ca7793      
1999 02  09.20162  05 11 16.81   +26 39 17.7   21.8R 98XY95    709  Ca7793      
1999 02  09.24669  05 11 16.69   +26 39 17.9   21.4R 98XY95    709  Ca7793      
1999 02  09.25229  05 11 16.76   +26 39 17.7   21.5R 98XY95    709  Ca7793      
1999 02  10.11227  05 11 15.09   +26 39 10.8   22.5R 98XY95    709  Ca7793      
1999 02  10.15723  05 11 15.04   +26 39 10.7   22.5R 98XY95    709  Ca7793      
1999 02  10.20213  05 11 14.90   +26 39 09.9   21.3R 98XY95    709  Ca7793      
1999 02  10.23580  05 11 14.85   +26 39 10.1   21.2R 98XY95    709  Ca7793      
1999 11  30.35300  05 22 55.21   +27 00 12.0   22.3V 98XY95    695  Ca7793      
1999 11  30.36009  05 22 55.17   +27 00 11.9   22.3V 98XY95    695  Ca7793      
1999 11  30.51407  05 22 54.36   +27 00 11.7   23.6V 98XY95    695  Ca7793      
1999 11  30.52117  05 22 54.33   +27 00 11.7   22.8V 98XY95    695  Ca7793      
1999 12  07.34787  05 22 18.38   +26 59 57.1   22.0R 98XY95    709  Ca8501      
1999 12  07.39154  05 22 18.23   +26 59 57.0   21.8R 98XY95    709  Ca8501      
1999 12  13.27262  05 21 46.74   +26 59 39.6   22.9R 98XY95    709  Ca7793      
1999 12  13.31629  05 21 46.33   +26 59 38.9   22.6R 98XY95    709  Ca7793      
1999 12  13.35995  05 21 46.18   +26 59 37.9   23.1R 98XY95    709  Ca7793      
1999 12  13.40362  05 21 45.86   +26 59 38.2   22.3R 98XY95    709  Ca7793      
2000 01  29.11885  05 18 08.78   +26 55 37.2         98XY95    705  Ca9919      
2000 01  29.14444  05 18 08.73   +26 55 36.8         98XY95    705  Ca9919      
2000 01  29.17582  05 18 08.64   +26 55 36.7         98XY95    705  Ca9919      
2000 11  28.43001  05 29 36.66   +27 13 49.7   22.7R 98XY95    695  Cc3588      
2000 11  29.32058  05 29 32.07   +27 13 49.2   22.8R 98XY95    695  Cc3588      
2000 11  29.42294  05 29 31.54   +27 13 49.1   22.5R 98XY95    695  Cc3588      
2001 11  21.32534  05 36 55.98   +27 26 20.4         98XY95    696  Ce1624      
2001 11  21.34685  05 36 55.89   +27 26 20.9         98XY95    696  Ce1624      
2007 09  16.51956  06 20 47.00   +28 07 37.6   22.5R 98XY95    675  Cy6664      
2007 09  17.46998  06 20 49.22   +28 07 44.2         98XY95    675  Cy6664      
2013 04  11.25046  06 49 31.621  +28 24 56.42  22.3w 98XY95    F51  C~1vV3      
2013 04  11.25511  06 49 31.625  +28 24 56.22  22.4w 98XY95    F51  C~1vV3      
2013 04  11.26436  06 49 31.647  +28 24 56.12  22.5w 98XY95    F51  C~1vV3      
2013 12  04.44433  07 04 34.437  +28 18 22.71  22.0w 98XY95    F51  C~1vV3      
2013 12  04.45832  07 04 34.392  +28 18 22.91  22.1w 98XY95    F51  C~1vV3      
2013 12  04.47231  07 04 34.321  +28 18 23.17  21.9w 98XY95    F51  C~1vV3      
2013 12  26.37499  07 02 38.801  +28 22 46.18  22.1G 98XY95    F51  C~2qaP      
2013 12  26.39042  07 02 38.701  +28 22 46.26  22.2G 98XY95    F51  C~2qaP      
2013 12  26.40585  07 02 38.616  +28 22 46.44  22.5G 98XY95    F51  C~2qaP      
2014 01  24.29820  06 59 53.870  +28 26 43.07  22.4G 98XY95    F51  C~2qaP      
2014 01  24.30945  06 59 53.838  +28 26 43.30  22.2G 98XY95    F51  C~2qaP      
2014 01  24.32068  06 59 53.775  +28 26 43.08  21.6G 98XY95    F51  C~2qaP      
2014 01  24.33195  06 59 53.698  +28 26 43.24  21.7G 98XY95    F51  C~2qaP      
2014 12  26.51975  07 10 39.939  +28 17 15.44  22.7G 98XY95    F51  C~2qaP      
2014 12  26.53207  07 10 39.886  +28 17 15.70  22.0G 98XY95    F51  C~2qaP      
2014 12  26.54436  07 10 39.789  +28 17 15.63  22.7G 98XY95    F51  C~2qaP      
2014 12  26.55673  07 10 39.732  +28 17 15.89  22.2G 98XY95    F51  C~2qaP      
2015 01  18.28981  07 08 28.616  +28 21 06.49  22.3w 98XY95    F51  C~1vV3      
2015 01  18.30314  07 08 28.523  +28 21 06.89  22.1w 98XY95    F51  C~1vV3      
2015 01  18.31641  07 08 28.455  +28 21 07.06  22.1w 98XY95    F51  C~1vV3      
2015 01  18.32977  07 08 28.373  +28 21 06.83  22.6w 98XY95    F51  C~1vV3      
2015 01  20.32497  07 08 17.109  +28 21 22.36  22.1w 98XY95    F51  C~1vV3      
2015 01  20.33690  07 08 17.041  +28 21 22.43  22.0w 98XY95    F51  C~1vV3      
2015 01  20.34881  07 08 16.973  +28 21 22.55  22.0w 98XY95    F51  C~1vV3      
2015 01  20.36076  07 08 16.902  +28 21 22.54  22.0w 98XY95    F51  C~1vV3      
2015 01  22.30096  07 08 06.081  +28 21 36.47  22.2w 98XY95    F51  C~1vV3      
2015 01  22.31283  07 08 06.002  +28 21 36.61  22.0w 98XY95    F51  C~1vV3      
2015 01  22.32474  07 08 05.937  +28 21 36.75  22.2w 98XY95    F51  C~1vV3      
2016 01  07.33964  07 17 37.583  +28 12 21.44  22.8G 98XY95    F51  C~2qaP      
2016 01  07.34997  07 17 37.514  +28 12 21.90  22.5G 98XY95    F51  C~2qaP      
2016 01  07.36033  07 17 37.437  +28 12 22.30  21.7G 98XY95    F51  C~2qaP      
2016 01  07.37068  07 17 37.397  +28 12 22.35  21.5G 98XY95    F51  C~2qaP      
2016 02  09.27788  07 14 37.302  +28 16 41.82  22.5G 98XY95    F51  C~2qaP      
2016 02  09.29212  07 14 37.245  +28 16 42.06  22.3G 98XY95    F51  C~2qaP      
2016 02  09.30643  07 14 37.176  +28 16 42.36  22.3G 98XY95    F51  C~2qaP      
2016 03  13.14367  07 12 48.99   +28 16 21.5   22.2R 98XY95    G37  C~1pPV      
2016 03  13.24061  07 12 48.83   +28 16 21.0         98XY95    G37  C~1pPV      
2016 03  31.24650  07 12 38.210  +28 14 13.83  22.7G 98XY95    F51  C~2qaP      
2016 03  31.26814  07 12 38.214  +28 14 13.58  22.9G 98XY95    F51  C~2qaP      
2016 03  31.27893  07 12 38.219  +28 14 13.53  22.5G 98XY95    F51  C~2qaP      
2016 12  25.52077  07 26 53.770  +28 00 41.72  22.1G 98XY95    F51  C~2qaP      
2016 12  25.53109  07 26 53.719  +28 00 41.88  22.2G 98XY95    F51  C~2qaP      
2016 12  25.54140  07 26 53.661  +28 00 41.99  22.1G 98XY95    F51  C~2qaP      
2017 01  16.47373  07 24 47.385  +28 05 26.24  22.3G 98XY95    F51  C~2qaP      
2017 01  16.48557  07 24 47.357  +28 05 26.64  22.2G 98XY95    F51  C~2qaP      
2018 01  08.39764  07 33 45.677  +27 53 04.48  21.8G 98XY95    F51  C~2qaP      
2018 01  15.32999  07 33 05.302  +27 54 36.65  22.0G 98XY95    F51  C~2qaP      
2018 01  15.34250  07 33 05.231  +27 54 36.78  22.1G 98XY95    F51  C~2qaP      
2018 01  15.35499  07 33 05.150  +27 54 37.00  22.0G 98XY95    F51  C~2qaP      
2018 01  15.36747  07 33 05.077  +27 54 37.11  21.9G 98XY95    F51  C~2qaP      

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    -0.07       0.00    -1.04
  2   0.0003      0.00     0.83       0.00    -0.89
  3   0.0004      0.00     0.69       0.00    -0.80
  4   0.0026      0.00     0.22       0.00    -0.86
  5   0.0035      0.00     0.36       0.00    -0.85
  6   0.0991      0.00     0.46       0.00     0.08
  7   0.1019      0.00     0.00       0.00    -0.54
  8   0.1020      0.00    -1.19       0.00    -0.06
  9   0.1021      0.00     0.77       0.00    -1.07
 10   0.1022      0.00    -0.54       0.00    -0.07
 11   0.1593      0.00     0.73       0.00     0.31
 12   0.1594      0.00    -0.76       0.00     0.27
 13   0.1595      0.00    -0.22       0.00     0.57
 14   0.1596      0.00     0.75       0.00     1.40
 15   0.1596      0.00    -1.17       0.00     0.93
 16   0.1597      0.00    -1.54       0.00     1.40
 17   0.1597      0.00    -0.31       0.00     1.23
 18   0.1621      0.00     0.39       0.00    -0.86
 19   0.1622      0.00     1.02       0.00    -0.70
 20   0.1623      0.00     0.29       0.00    -1.24
 21   0.1624      0.00     0.56       0.00    -0.85
 22   0.9649      0.00    -0.32       0.00     0.31
 23   0.9649      0.00    -0.36       0.00     0.22
 24   0.9654      0.00    -0.37       0.00     0.33
 25   0.9654      0.00    -0.26       0.00     0.35
 26   0.9841      0.00    -0.02       0.00     0.64
 27   0.9842      0.00     1.27       0.00     0.66
 28   1.0003      0.00     1.68       0.00     0.84
 29   1.0004      0.00    -0.89       0.00     0.29
 30   1.0005      0.00     0.43       0.00    -0.56
 31   1.0007      0.00    -0.80       0.00    -0.10
 32   1.1286      0.00    -0.76       0.00     0.07
 33   1.1286      0.00    -0.23       0.00    -0.18
 34   1.1287      0.00    -0.02       0.00    -0.09
 35   1.9617      0.00    -0.37       0.00    -0.04
 36   1.9641      0.00    -0.38       0.00     0.01
 37   1.9644      0.00    -0.25       0.00    -0.01
 38   2.9416      0.00    -0.14       0.00     0.50
 39   2.9416      0.00     0.09       0.00     0.97
 40   8.7600      0.00     0.16       0.00    -0.05
 41   8.7626      0.00     0.00       0.00    -0.29
 42  14.3281      0.00     0.25       0.00    -0.02
 43  14.3281      0.00     0.16       0.00    -0.17
 44  14.3281      0.00     0.18       0.00    -0.17
 45  14.9775      0.00    -0.32       0.00     0.09
 46  14.9775      0.00     0.00       0.00     0.11
 47  14.9776      0.00    -0.06       0.00     0.18
 48  15.0375      0.00    -0.01       0.00     0.05
 49  15.0376      0.00    -0.17       0.00    -0.04
 50  15.0376      0.00    -0.10       0.00    -0.03
 51  15.1167      0.00    -0.20       0.00    -0.14
 52  15.1168      0.00     0.25       0.00     0.03
 53  15.1168      0.00     0.22       0.00    -0.25
 54  15.1168      0.00    -0.01       0.00    -0.16
 55  16.0372      0.00    -0.16       0.00    -0.03
 56  16.0373      0.00     0.11       0.00     0.09
 57  16.0373      0.00    -0.28       0.00    -0.13
 58  16.0373      0.00    -0.07       0.00    -0.01
 59  16.0996      0.00     0.13       0.00    -0.07
 60  16.0996      0.00    -0.12       0.00     0.22
 61  16.0997      0.00     0.01       0.00     0.28
 62  16.0997      0.00    -0.07       0.00    -0.06
 63  16.1052      0.00    -0.05       0.00     0.14
 64  16.1052      0.00    -0.05       0.00     0.12
 65  16.1052      0.00    -0.05       0.00     0.14
 66  16.1053      0.00    -0.09       0.00     0.04
 67  16.1106      0.00     0.03       0.00    -0.03
 68  16.1106      0.00    -0.16       0.00     0.02
 69  16.1106      0.00    -0.12       0.00     0.07
 70  17.0689      0.00     0.32       0.00    -0.44
 71  17.0690      0.00     0.21       0.00    -0.11
 72  17.0690      0.00    -0.03       0.00     0.17
 73  17.0690      0.00     0.29       0.00     0.10
 74  17.1591      0.00    -0.12       0.00    -0.31
 75  17.1591      0.00     0.06       0.00    -0.13
 76  17.1592      0.00     0.06       0.00     0.11
 77  17.2491      0.00    -0.28       0.00     0.26
 78  17.2494      0.00    -0.19       0.00     0.26
 79  17.2986      0.00     0.09       0.00    -0.01
 80  17.2987      0.00     0.04       0.00    -0.06
 81  17.2987      0.00     0.05       0.00    -0.01
 82  18.0359      0.00    -0.09       0.00    -0.10
 83  18.0359      0.00     0.02       0.00    -0.08
 84  18.0359      0.00     0.02       0.00    -0.12
 85  18.0960      0.00    -0.16       0.00     0.04
 86  18.0960      0.00     0.46       0.00     0.31
 87  19.0732      0.00    -0.21       0.00    -0.25
 88  19.0922      0.00     0.01       0.00    -0.02
 89  19.0922      0.00     0.06       0.00    -0.05
 90  19.0922      0.00    -0.05       0.00     0.01
 91  19.0923      0.00    -0.04       0.00    -0.04

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.

98XY95    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        64.763    64.763    64.764
ecceobj         0.423     0.423     0.423
incobj          6.649     6.649     6.649
qmin           36.562    36.560    36.587
qmax           93.594    94.072    93.449
amean          64.188    64.380    63.875
amin           63.232    63.390    62.877
amax           65.423    65.622    65.379
emean           0.419     0.420     0.415
emin            0.406     0.409     0.404
emax            0.431     0.434     0.429
imean           6.156     6.255     6.213
imin            5.653     5.752     5.740
imax            6.686     6.786     6.696
excite_mean     0.432     0.434     0.429
fracstop        1.000     1.000     1.000
cjmean          3.106     3.106     3.105

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       174.9     175.6     175.3
kozaiamp        180.0     180.0     180.0