Orbit Fit and Astrometric record for 15GA54

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: 15GA54    
# Created Mon Apr 22 01:10:04 2019
# Orbit generated from Bernstein formalism
# Fitting   34 observations of   34
# Arc:   1.38y
# First observation: 2015/02/20
#  Last observation: 2016/07/07
Preliminary a, adot, b, bdot, g, gdot:
  -0.000580   0.051792   0.000037   0.010084   0.042937   0.000000
# Chi-squared of fit:     8.87 DOF:   62 RMS:  0.09
# Min/Max residuals:    -0.34    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.869478E-05  5.192454E-02  4.016825E-06  1.022919E-02  4.374450E-02  1.572750E-02
# Covariance matrix:
  5.5415E-13  4.4860E-13 -4.7327E-14  2.6312E-13  7.0798E-13  1.9454E-11
  4.4860E-13  1.4147E-12 -9.0368E-14  5.0859E-13  1.1858E-12  3.7617E-11
 -4.7327E-14 -9.0368E-14  1.6952E-13 -1.9715E-13 -9.1273E-14 -2.8356E-12
  2.6312E-13  5.0859E-13 -1.9715E-13  4.2756E-13  5.0951E-13  1.5941E-11
  7.0798E-13  1.1858E-12 -9.1273E-14  5.0951E-13  1.3097E-12  3.7675E-11
  1.9454E-11  3.7617E-11 -2.8356E-12  1.5941E-11  3.7675E-11  1.1790E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.502607 -154.777322    0.795863    0.025538   -0.581276  2457074.131608
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           86.78000 +/-     0.091
Argument of Peri:      256.78624 +/-     0.056
Long of Asc Node:      191.06329 +/-     0.001
Inclination:            11.38729 +/-     0.000
Eccentricity:         0.25849562 +/-    0.0005
Semi-Major Axis:     22.32313849 +/-    0.0060
Time of Perihelion: 2447784.0774 +/-       9.0
Perihelion:          16.55270502 +/-    0.0120
Aphelion:            28.09357195 +/-    0.0135
Period (y)              105.4729 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -21.52914222 +/-    0.0005
Ecliptic Y           -9.25997942 +/-    0.0002
Ecliptic Z            0.99828097 +/-    0.0000
Ecliptic XDOT         0.00051689 +/-    0.0000
Ecliptic YDOT        -0.00335272 +/-    0.0000
Ecliptic ZDOT         0.00068268 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   23.45736022 +/-    0.0005
Geocenter to KBO     22.86001776 +/-    0.0006
# Hcoef: 10.72

The following table shows the complete astrometric record for 15GA54. 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 (15GA54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  20.63083  13 37 10.610  -07 25 41.66  24.5r 15GA54    568  C~2ji7      
2015 03  18.57516  13 34 54.727  -07 07 43.31  24.3r 15GA54    568  C~2ji7      
2015 03  18.62254  13 34 54.403  -07 07 41.07  24.2r 15GA54    568  C~2ji7      
2015 04  11.50547  13 31 58.910  -06 47 14.69  24.1r 15GA54    568  C~2ji7      
2015 04  13.36971  13 31 44.404  -06 45 36.83  23.8r 15GA54    568  C~2ji7      
2015 04  13.41068  13 31 44.063  -06 45 34.76  23.7r 15GA54    568  C~2ji7      
2015 04  13.51324  13 31 43.267  -06 45 29.48  24.3r 15GA54    568  C~2ji7      
2015 04  19.41044  13 30 57.350  -06 40 23.27  24.1r 15GA54    568  C~2ji7      
2015 06  20.28316  13 25 13.120  -06 04 19.66  24.2r 15GA54    568  C~2ji7      
2015 06  20.32394  13 25 13.038  -06 04 19.32  24.3r 15GA54    568  C~2ji7      
2015 06  22.32783  13 25 09.405  -06 03 59.23  24.6r 15GA54    568  C~2ji7      
2015 07  14.28011  13 25 09.481  -06 04 25.39  24.4r 15GA54    568  C~2ji7      
2015 07  20.27306  13 25 22.388  -06 05 50.11  25.1r 15GA54    568  C~2ji7      
2016 02  04.53833  13 49 35.305  -08 03 25.24  24.5w 15GA54    568  C~2ji7      
2016 02  04.59350  13 49 35.263  -08 03 24.34  24.6w 15GA54    568  C~2ji7      
2016 02  04.60621  13 49 35.250  -08 03 24.02  24.6w 15GA54    568  C~2ji7      
2016 02  04.65482  13 49 35.218  -08 03 23.30  24.8w 15GA54    568  C~2ji7      
2016 02  11.58929  13 49 27.131  -08 01 00.46  24.7w 15GA54    568  C~2ji7      
2016 03  11.51709  13 47 36.618  -07 44 24.92  24.7w 15GA54    568  C~2ji7      
2016 03  11.52342  13 47 36.581  -07 44 24.72  24.7w 15GA54    568  C~2ji7      
2016 03  11.58318  13 47 36.252  -07 44 22.04  24.9w 15GA54    568  C~2ji7      
2016 03  11.59678  13 47 36.157  -07 44 21.36  24.8w 15GA54    568  C~2ji7      
2016 03  12.46991  13 47 31.164  -07 43 43.10  24.7w 15GA54    568  C~2ji7      
2016 03  12.51169  13 47 30.927  -07 43 41.41  24.6w 15GA54    568  C~2ji7      
2016 03  12.52638  13 47 30.831  -07 43 40.53        15GA54    568  C~2ji7      
2016 03  12.61050  13 47 30.336  -07 43 36.93  24.4w 15GA54    568  C~2ji7      
2016 04  03.46957  13 45 03.200  -07 26 06.17  24.5w 15GA54    568  C~2ji7      
2016 04  09.45073  13 44 17.998  -07 21 01.92  24.5w 15GA54    568  C~2ji7      
2016 04  13.45991  13 43 47.158  -07 17 37.89  24.6w 15GA54    568  C~2ji7      
2016 05  02.33152  13 41 22.887  -07 02 14.58  24.3w 15GA54    568  C~2ji7      
2016 05  07.33487  13 40 46.485  -06 58 29.47  24.4w 15GA54    568  C~2ji7      
2016 06  04.40200  13 37 59.472  -06 42 00.88  24.7w 15GA54    568  C~2ji7      
2016 06  27.34644  13 36 52.061  -06 36 11.38  24.7w 15GA54    568  C~2ji7      
2016 07  07.33613  13 36 46.520  -06 36 07.12  25.0w 15GA54    568  C~2ji7      

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     0.02       0.00    -0.07
  2   0.0710  -2275.58     0.12     269.70     0.04
  3   0.0712  -2280.89     0.09     270.03    -0.04
  4   0.1365  -5162.20     0.09     458.77    -0.02
  5   0.1417  -5399.24    -0.15     470.88     0.10
  6   0.1418  -5404.73    -0.34     470.95    -0.05
  7   0.1420  -5417.71    -0.04     471.53    -0.03
  8   0.1582  -6166.94     0.04     506.32     0.09
  9   0.3276 -11745.34    -0.04     634.20     0.06
 10   0.3277 -11746.60     0.06     634.07    -0.03
 11   0.3332 -11804.57     0.10     632.77    -0.00
 12   0.3933 -11793.84    -0.07     608.83    -0.04
 13   0.4097 -11582.97     0.13     601.00     0.04
 14   0.9553  11153.35     0.03    1869.26     0.02
 15   0.9554  11152.44     0.02    1869.88    -0.05
 16   0.9554  11152.15    -0.06    1870.11     0.03
 17   0.9556  11151.44     0.04    1870.61    -0.07
 18   0.9746  10987.88    -0.07    1961.41    -0.03
 19   1.0538   9094.22    -0.08    2305.63    -0.05
 20   1.0538   9093.64    -0.06    2305.62    -0.12
 21   1.0539   9088.10     0.19    2306.38     0.05
 22   1.0540   9086.54    -0.06    2306.51     0.05
 23   1.0564   9003.39    -0.07    2315.71     0.01
 24   1.0565   8999.49     0.13    2316.03    -0.08
 25   1.0565   8997.84    -0.07    2316.34     0.10
 26   1.0568   8989.66     0.03    2317.08     0.01
 27   1.1166   6567.14    -0.01    2514.47    -0.01
 28   1.1330   5829.63     0.05    2556.97     0.07
 29   1.1440   5327.74    -0.01    2582.44     0.09
 30   1.1956   2990.98     0.20    2670.34     0.10
 31   1.2093   2404.16    -0.15    2684.64    -0.10
 32   1.2862   -272.71     0.05    2706.29    -0.07
 33   1.3490  -1335.55     0.05    2667.65     0.14
 34   1.3763  -1414.04    -0.16    2641.64    -0.12

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.

15GA54    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        22.253    22.286    22.220
ecceobj         0.260     0.260     0.260
incobj         11.416    11.416    11.415
qmin           16.177    16.428    16.337
qmax           28.375    28.404    28.637
amean          21.712    22.352    22.307
amin           21.326    22.229    22.097
amax           22.513    22.593    22.639
emean           0.240     0.257     0.257
emin            0.222     0.252     0.247
emax            0.261     0.261     0.267
imean          11.469    11.314    11.617
imin           10.864    11.264    11.232
imax           12.240    11.354    12.142
excite_mean     0.312     0.324     0.327
fracstop        0.012     0.000     0.014
cjmean          3.005     2.984     2.982

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       185.5     257.8     179.8
kozaiamp        179.3       2.3     178.9