Orbit Fit and Astrometric record for 15GY54

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: 15GY54    
# Created Thu Apr 18 01:10:30 2019
# Orbit generated from Bernstein formalism
# Fitting   30 observations of   30
# Arc:   2.25y
# First observation: 2015/02/20
#  Last observation: 2017/05/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000216   0.032479   0.000007  -0.001476   0.028863   0.000000
# Chi-squared of fit:     6.88 DOF:   54 RMS:  0.08
# Min/Max residuals:    -0.28    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.756954E-05  3.235673E-02 -1.332659E-06 -1.470867E-03  2.902342E-02  2.288339E-03
# Covariance matrix:
  2.1182E-13 -9.9750E-15 -4.5580E-16 -3.7778E-15  1.5320E-13  1.6513E-12
 -9.9750E-15  4.2528E-13  2.8933E-15 -2.1470E-14  2.2977E-13  8.8426E-12
 -4.5580E-16  2.8933E-15  1.0633E-13 -8.4821E-14  9.1007E-16  9.2193E-14
 -3.7778E-15 -2.1470E-14 -8.4821E-14  1.2561E-13 -1.4673E-14 -6.3980E-13
  1.5320E-13  2.2977E-13  9.1007E-16 -1.4673E-14  2.8176E-13  6.1487E-12
  1.6513E-12  8.8426E-12  9.2193E-14 -6.3980E-13  6.1487E-12  2.6291E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.556076 -153.047924    0.812978    0.025002   -0.557110  2457074.139828
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           20.50972 +/-     0.170
Argument of Peri:      108.94201 +/-     0.227
Long of Asc Node:       70.32545 +/-     0.007
Inclination:             3.57198 +/-     0.000
Eccentricity:         0.12327472 +/-    0.0003
Semi-Major Axis:     39.49494894 +/-    0.0037
Time of Perihelion: 2451905.5284 +/-      42.9
Perihelion:          34.62621999 +/-    0.0110
Aphelion:            44.36367788 +/-    0.0113
Period (y)              248.2107 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -31.55042495 +/-    0.0006
Ecliptic Y          -15.12903464 +/-    0.0003
Ecliptic Z            1.53655623 +/-    0.0000
Ecliptic XDOT         0.00118206 +/-    0.0000
Ecliptic YDOT        -0.00282691 +/-    0.0000
Ecliptic ZDOT        -0.00012889 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.02396335 +/-    0.0005
Geocenter to KBO     34.45493244 +/-    0.0006
# Hcoef:  9.03

The following table shows the complete astrometric record for 15GY54. 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 (15GY54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  20.63905  13 43 45.582  -08 00 04.37  24.4r 15GY54    568  C~2lV9      
2015 03  18.58338  13 42 13.958  -07 50 16.81  24.4r 15GY54    568  C~2lV9      
2015 03  18.63265  13 42 13.733  -07 50 15.53  24.4r 15GY54    568  C~2lV9      
2015 03  20.58759  13 42 04.853  -07 49 21.77  24.1r 15GY54    568  C~2lV9      
2015 04  11.52247  13 40 14.176  -07 38 34.73  24.0r 15GY54    568  C~2lV9      
2015 04  13.38609  13 40 04.239  -07 37 38.10  24.5r 15GY54    568  C~2lV9      
2015 04  13.44737  13 40 03.886  -07 37 36.47  24.6r 15GY54    568  C~2lV9      
2015 04  13.45145  13 40 03.871  -07 37 36.22  24.2r 15GY54    568  C~2lV9      
2015 04  13.45555  13 40 03.855  -07 37 36.10  24.5r 15GY54    568  C~2lV9      
2015 04  13.52960  13 40 03.443  -07 37 33.89  24.4r 15GY54    568  C~2lV9      
2015 04  19.54452  13 39 31.125  -07 34 32.58  24.5r 15GY54    568  C~2lV9      
2015 05  18.34948  13 37 06.305  -07 21 41.83  24.2r 15GY54    568  C~2lV9      
2015 06  20.29948  13 35 20.259  -07 13 50.35  20.9r 15GY54    568  C~2lV9      
2015 06  20.34029  13 35 20.187  -07 13 49.99  24.8r 15GY54    568  C~2lV9      
2015 06  22.34439  13 35 16.784  -07 13 40.45  25.0r 15GY54    568  C~2lV9      
2015 07  14.29673  13 35 06.219  -07 14 37.27  24.6r 15GY54    568  C~2lV9      
2015 07  20.28959  13 35 12.042  -07 15 43.97  24.5r 15GY54    568  C~2lV9      
2016 02  04.62240  13 51 01.256  -08 47 26.21  24.7w 15GY54    568  C~2lV9      
2016 02  11.60562  13 50 54.870  -08 46 25.71  24.8w 15GY54    568  C~2lV9      
2016 03  11.61299  13 49 36.307  -08 37 43.39  24.8w 15GY54    568  C~2lV9      
2016 04  03.48172  13 47 50.252  -08 27 19.15  24.6w 15GY54    568  C~2lV9      
2016 04  09.46287  13 47 18.936  -08 24 22.25  24.7w 15GY54    568  C~2lV9      
2016 05  02.35180  13 45 16.933  -08 13 17.59  24.5w 15GY54    568  C~2lV9      
2016 05  07.35515  13 44 51.363  -08 11 03.72  24.7w 15GY54    568  C~2lV9      
2016 05  29.33555  13 43 13.133  -08 02 56.00  25.1w 15GY54    568  C~2lV9      
2016 06  04.39796  13 42 51.531  -08 01 17.84  24.3w 15GY54    568  C~2lV9      
2016 06  27.32960  13 41 58.686  -07 58 05.34  24.8w 15GY54    568  C~2lV9      
2016 07  07.31994  13 41 51.629  -07 58 17.11  24.9w 15GY54    568  C~2lV9      
2017 03  31.45585  13 55 04.779  -09 13 20.10  24.4w 15GY54    568  C~2lV9      
2017 05  24.26091  13 50 30.041  -08 49 12.50  24.7w 15GY54    568  C~2lV9      

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     0.01       0.00     0.11
  2   0.0710  -1481.43     0.05      60.52     0.05
  3   0.0712  -1485.01     0.07      60.51    -0.02
  4   0.0765  -1627.48     0.01      63.32    -0.07
  5   0.1366  -3395.44    -0.07      75.69    -0.09
  6   0.1417  -3553.70     0.10      75.33     0.16
  7   0.1418  -3559.19    -0.08      74.96    -0.15
  8   0.1419  -3559.49    -0.03      75.12     0.01
  9   0.1419  -3559.75     0.06      75.14     0.04
 10   0.1421  -3566.26    -0.03      75.00    -0.04
 11   0.1585  -4080.01    -0.28      71.03     0.18
 12   0.2374  -6368.36    -0.04      12.14     0.01
 13   0.3276  -8011.82     0.16    -119.86    -0.20
 14   0.3277  -8012.95     0.18    -119.92    -0.04
 15   0.3332  -8063.68    -0.04    -129.40     0.02
 16   0.3933  -8189.78    -0.05    -239.45     0.00
 17   0.4097  -8084.67    -0.04    -270.20     0.02
 18   0.9555   7055.89     0.06    -354.76     0.08
 19   0.9746   6945.81     0.03    -331.65    -0.01
 20   1.0540   5670.25     0.01    -255.74    -0.07
 21   1.1166   3976.99    -0.12    -230.88     0.08
 22   1.1330   3479.63     0.01    -230.89    -0.06
 23   1.1957   1550.54     0.03    -255.63    -0.01
 24   1.2094   1148.13    -0.06    -266.24     0.06
 25   1.2695   -388.51     0.07    -332.89     0.02
 26   1.2861   -723.22    -0.02    -356.27    -0.00
 27   1.3489  -1525.02     0.06    -458.25    -0.12
 28   1.3763  -1618.64    -0.03    -506.89     0.01
 29   2.1076  10987.49     0.06    -537.74    -0.04
 30   2.2550   6660.31    -0.08    -618.05     0.08

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.

15GY54    quality flag:3

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

axisobj        39.123    39.138    39.108
ecceobj         0.115     0.116     0.114
incobj          3.574     3.574     3.574
qmin           33.756    33.776    33.799
qmax           45.696    45.689    45.724
amean          39.459    39.459    39.459
amin           39.000    39.014    38.993
amax           39.954    39.951    39.968
emean           0.125     0.125     0.125
emin            0.106     0.106     0.105
emax            0.145     0.144     0.145
imean           1.656     1.700     1.616
imin            0.726     0.847     0.558
imax            2.541     2.562     2.520
excite_mean     0.129     0.129     0.129
fracstop        1.000     1.000     1.000
cjmean          3.033     3.033     3.033

libcent 0       180.0     179.4     180.2
libamp  0        99.1      94.4     102.8
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       179.7     183.7     178.8
kozaiamp        179.9     179.9     179.9