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 Thu Dec 14 02:36:58 2017
# Orbit generated from Bernstein formalism
# Fitting   56 observations of   60
# Arc:  17.25y
# First observation: 1998/12/12
#  Last observation: 2016/03/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.004777   0.029525  -0.000443   0.002930   0.018728   0.000000
# Chi-squared of fit:   372.79 DOF:  106 RMS:  0.46
# Min/Max residuals:    -1.11    1.21
# Exact a, adot, b, bdot, g, gdot:
  1.716083E-05  2.515687E-02  5.880603E-06  2.480544E-03  2.378577E-02 -7.230543E-03
# Covariance matrix:
  7.1754E-14 -2.6319E-14  2.4141E-15 -2.3616E-15  3.4774E-14 -5.1328E-14
 -2.6319E-14  2.5425E-14 -2.2845E-15  2.5281E-15 -1.5964E-14  5.3885E-14
  2.4141E-15 -2.2845E-15  4.5662E-14 -3.3067E-15  2.6884E-15 -4.9990E-15
 -2.3616E-15  2.5281E-15 -3.3067E-15  6.6978E-16 -1.6652E-15  5.4498E-15
  3.4774E-14 -1.5964E-14  2.6884E-15 -1.6652E-15  9.4456E-14 -3.9679E-14
 -5.1328E-14  5.3885E-14 -4.9990E-15  5.4498E-15 -3.9679E-14  1.1642E-13
#      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:          336.97079 +/-     0.004
Argument of Peri:       89.15981 +/-     0.006
Long of Asc Node:       47.27398 +/-     0.000
Inclination:             6.65164 +/-     0.000
Eccentricity:         0.41928992 +/-    0.0000
Semi-Major Axis:     64.37079769 +/-    0.0059
Time of Perihelion: 2463227.7486 +/-       1.0
Perihelion:          37.38077121 +/-    0.0041
Aphelion:            91.36082416 +/-    0.0087
Period (y)              516.4658 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X            7.43002640 +/-    0.0001
Ecliptic Y           42.29132006 +/-    0.0005
Ecliptic Z            2.70975126 +/-    0.0000
Ecliptic XDOT        -0.00299989 +/-    0.0000
Ecliptic YDOT        -0.00032512 +/-    0.0000
Ecliptic ZDOT         0.00023127 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.02445580 +/-    0.0005
Geocenter to KBO     42.04195127 +/-    0.0005
# Hcoef:  6.19

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      
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 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      

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    -0.09       0.00    -0.87
  2   0.0003     -7.23     0.73       0.26    -0.79
  3   0.0004    -10.58     0.61       0.42    -0.69
  4   0.0026    -67.61     0.19       1.33    -0.71
  5   0.0035    -91.09     0.31       1.75    -0.72
  6   0.0991  -2359.01     0.44     -12.88     0.20
  7   0.1019  -2413.30    -0.01     -15.48    -0.39
  8   0.1020  -2416.75    -1.04     -14.99     0.18
  9   0.1021  -2417.53     0.63     -16.23    -0.97
 10   0.1022  -2421.08    -0.46     -15.24     0.13
 11   0.1593  -3267.63     0.69     -71.37     0.40
 12   0.1594  -3269.79    -0.64     -71.39     0.48
 13   0.1595  -3269.77    -0.13     -71.19     0.73
 14   0.1596  -3269.99 (   0.80)    -70.57 (   1.49)
 15   0.1596  -3271.90    -0.95     -70.91     1.17
 16   0.1597  -3273.49 (  -1.24)    -70.57 (   1.66)
 17   0.1597  -3272.57 (  -0.16)    -70.85 (   1.40)
 18   0.1621  -3295.47     0.29     -75.82    -0.73
 19   0.1622  -3296.14     0.86     -75.86    -0.63
 20   0.1623  -3298.08     0.17     -76.50    -1.11
 21   0.1624  -3298.73     0.45     -76.24    -0.74
 22   0.9649   6145.34    -0.22     490.92     0.47
 23   0.9649   6144.80    -0.26     490.86     0.38
 24   0.9654   6133.97    -0.26     491.33     0.49
 25   0.9654   6133.57    -0.17     491.36     0.50
 26   0.9841   5652.74     0.06     506.99     0.78
 27   0.9842   5650.73     1.21     507.02     0.73
 28   1.0003   5229.31 (   1.59)    516.58 (   0.88)
 29   1.0004   5223.79    -0.74     516.23     0.48
 30   1.0005   5221.72     0.38     515.36    -0.44
 31   1.0007   5217.47    -0.69     515.94     0.09
 32   1.1286   2304.46    -0.67     473.10     0.25
 33   1.1286   2303.77    -0.22     472.75    -0.03
 34   1.1287   2302.56    -0.02     472.73     0.04
 35   1.9617  11552.63    -0.31    1010.12     0.10
 36   1.9641  11491.27    -0.32    1012.62     0.15
 37   1.9644  11484.18    -0.20    1012.87     0.12
 38   2.9416  17462.44    -0.09    1518.89     0.61
 39   2.9416  17461.25     0.13    1519.43     1.08
 40   8.7600  53455.87     0.15    4441.24    -0.03
 41   8.7626  53486.81     0.01    4449.80    -0.28
 42  14.3281  78417.19     0.21    7672.91    -0.07
 43  14.3281  78417.27     0.13    7672.70    -0.24
 44  14.3281  78417.62     0.15    7672.63    -0.24
 45  14.9775  92337.41    -0.25    9037.91    -0.03
 46  14.9775  92336.67     0.09    9038.03     0.03
 47  14.9776  92335.52     0.01    9038.15     0.11
 48  16.0996  96011.82     0.24    9760.16    -0.16
 49  16.0996  96010.27    -0.07    9760.37     0.12
 50  16.0997  96009.15     0.05    9760.39     0.21
 51  16.0997  96007.89     0.03    9759.94    -0.18
 52  16.1052  95826.05     0.01    9749.88     0.04
 53  16.1052  95824.96     0.02    9749.79     0.02
 54  16.1052  95823.86     0.02    9749.76     0.05
 55  16.1053  95822.73    -0.01    9749.58    -0.07
 56  16.1106  95648.33     0.12    9738.90    -0.13
 57  16.1106  95647.06    -0.08    9738.86    -0.10
 58  16.1106  95646.00    -0.06    9738.86    -0.04
 59  17.2491 100237.41    -0.26   10094.35     0.12
 60  17.2494 100234.92    -0.16   10093.39     0.13

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        64.768    64.786    64.750
ecceobj         0.423     0.423     0.422
incobj          6.649     6.649     6.649
qmin           36.590    36.645    36.573
qmax           93.486    93.497    93.655
amean          64.323    64.358    64.143
amin           63.403    63.551    63.039
amax           65.399    65.402    65.435
emean           0.419     0.420     0.418
emin            0.409     0.410     0.405
emax            0.431     0.430     0.432
imean           6.170     6.183     6.181
imin            5.823     6.005     5.720
imax            6.499     6.432     6.651
excite_mean     0.433     0.433     0.432
fracstop        1.000     1.000     1.000
cjmean          3.106     3.106     3.106

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       174.6     179.6     176.3
kozaiamp        180.0     180.0     180.0