Orbit Fit and Astrometric record for 15GV55

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: 15GV55    
# Created Wed Feb 20 02:10:31 2019
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   25
# Arc:   2.04y
# First observation: 2015/03/18
#  Last observation: 2017/03/31
Preliminary a, adot, b, bdot, g, gdot:
  -0.000184   0.024994   0.000010   0.013414   0.029112   0.000000
# Chi-squared of fit:     2.25 DOF:   44 RMS:  0.05
# Min/Max residuals:    -0.15    0.11
# Exact a, adot, b, bdot, g, gdot:
  1.380822E-05  2.521411E-02  7.439278E-06  1.363568E-02  2.965093E-02  8.970140E-03
# Covariance matrix:
  1.7458E-13 -7.1335E-14 -3.8046E-15  2.3218E-14  1.2351E-13  9.7837E-13
 -7.1335E-14  4.7948E-13 -4.0464E-14  2.3937E-13  1.8985E-13  1.0131E-11
 -3.8046E-15 -4.0464E-14  1.1588E-13 -1.2017E-13 -2.6553E-14 -1.2848E-12
  2.3218E-14  2.3937E-13 -1.2017E-13  3.3772E-13  1.5835E-13  7.6044E-12
  1.2351E-13  1.8985E-13 -2.6553E-14  1.5835E-13  3.1413E-13  6.6945E-12
  9.7837E-13  1.0131E-11 -1.2848E-12  7.6044E-12  6.6945E-12  3.2184E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.163607 -152.238129    0.501916    0.002570   -0.855833  2457099.998148
# Heliocentric elements and errors
Epoch:              2457090.5000  =  2015/03/09
Mean Anomaly:           92.39472 +/-     0.095
Argument of Peri:      235.56576 +/-     0.059
Long of Asc Node:      206.63041 +/-     0.000
Inclination:            28.25166 +/-     0.001
Eccentricity:         0.30281027 +/-    0.0004
Semi-Major Axis:     31.50324806 +/-    0.0092
Time of Perihelion: 2440514.6402 +/-      15.4
Perihelion:          21.96374107 +/-    0.0144
Aphelion:            41.04275505 +/-    0.0176
Period (y)              176.8240 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -30.83751792 +/-    0.0006
Ecliptic Y          -15.66380239 +/-    0.0003
Ecliptic Z            0.09657219 +/-    0.0000
Ecliptic XDOT         0.00035130 +/-    0.0000
Ecliptic YDOT        -0.00245008 +/-    0.0000
Ecliptic ZDOT         0.00126151 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.58780917 +/-    0.0005
Geocenter to KBO     33.72575091 +/-    0.0006
# Hcoef:  7.68

The following table shows the complete astrometric record for 15GV55. 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 (15GV55) followed by the observatory code and reference code for the source of the astrometry.

2015 03  18.49737  13 43 21.116  -10 31 29.71  22.8r 15GV55    568  C~2lVC      
2015 03  18.53825  13 43 20.926  -10 31 28.25  22.9r 15GV55    568  C~2lVC      
2015 03  20.54180  13 43 11.536  -10 30 18.30  22.8r 15GV55    568  C~2lVC      
2015 04  11.47664  13 41 17.274  -10 16 26.43  23.0r 15GV55    568  C~2lVC      
2015 04  12.38346  13 41 12.288  -10 15 50.34  23.1r 15GV55    568  C~2lVC      
2015 04  12.42916  13 41 12.013  -10 15 48.64  23.0r 15GV55    568  C~2lVC      
2015 04  12.47137  13 41 11.781  -10 15 46.87  22.7r 15GV55    568  C~2lVC      
2015 04  18.44198  13 40 38.694  -10 11 48.92  22.7r 15GV55    568  C~2lVC      
2015 04  18.48972  13 40 38.423  -10 11 47.10  22.7r 15GV55    568  C~2lVC      
2015 05  17.25091  13 38 07.821  -09 53 32.12  22.8r 15GV55    568  C~2lVC      
2015 05  25.39277  13 37 31.915  -09 49 01.69  22.8r 15GV55    568  C~2lVC      
2015 05  25.45091  13 37 31.668  -09 48 59.83  23.2r 15GV55    568  C~2lVC      
2015 06  21.34235  13 36 10.035  -09 37 43.22  23.0r 15GV55    568  C~2lVC      
2015 07  12.29292  13 35 54.713  -09 33 39.79  23.4r 15GV55    568  C~2lVC      
2015 07  19.28272  13 35 59.913  -09 33 18.99  23.2r 15GV55    568  C~2lVC      
2016 02  04.63544  13 51 50.197  -10 35 52.29  23.2w 15GV55    568  C~2lVC      
2016 02  11.61375  13 51 43.309  -10 34 07.71  23.5w 15GV55    568  C~2lVC      
2016 03  11.61710  13 50 21.946  -10 22 03.81  23.1w 15GV55    568  C~2lVC      
2016 03  12.48956  13 50 18.381  -10 21 35.86  23.2w 15GV55    568  C~2lVC      
2016 04  03.48576  13 48 33.078  -10 08 32.62  23.1w 15GV55    568  C~2lVC      
2016 04  09.46692  13 48 00.969  -10 04 41.94  23.1w 15GV55    568  C~2lVC      
2016 06  27.31561  13 42 31.125  -09 24 20.03  23.2w 15GV55    568  C~2lVC      
2016 07  07.31185  13 42 23.148  -09 22 35.86  23.2w 15GV55    568  C~2lVC      
2017 03  30.52059  13 55 24.130  -09 58 17.14        15GV55    568  C~2lVC      
2017 03  31.45585  13 55 19.394  -09 57 42.51  23.0w 15GV55    568  C~2lVC      

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    -0.03
  2   0.0001     -3.14    -0.04       0.36     0.03
  3   0.0056   -157.49     0.01      16.08     0.03
  4   0.0657  -2029.61    -0.03     187.63    -0.01
  5   0.0681  -2111.27     0.05     194.84     0.11
  6   0.0683  -2115.67    -0.15     194.97    -0.10
  7   0.0684  -2119.50    -0.11     195.39     0.02
  8   0.0847  -2660.89     0.07     241.68     0.07
  9   0.0849  -2665.28     0.09     241.94    -0.02
 10   0.1636  -5135.87     0.03     460.43     0.01
 11   0.1859  -5728.83     0.08     520.48    -0.04
 12   0.1860  -5732.91     0.05     520.89    -0.04
 13   0.2597  -7104.38     0.03     713.89    -0.04
 14   0.3170  -7404.32    -0.08     858.50    -0.01
 15   0.3362  -7340.13     0.01     905.84     0.00
 16   0.8847   7114.65     0.05    2419.35     0.01
 17   0.9038   6982.64     0.03    2481.55     0.04
 18   0.9832   5603.08    -0.01    2736.13     0.00
 19   0.9856   5543.95     0.07    2743.71     0.05
 20   1.0458   3812.05     0.01    2926.66    -0.02
 21   1.0622   3286.72     0.01    2974.27     0.02
 22   1.2781  -2133.67    -0.01    3497.95    -0.05
 23   1.3054  -2281.27    -0.03    3552.88    -0.07
 24   2.0343   9286.66     0.03    5642.71     0.01
 25   2.0368   9208.82    -0.08    5650.69     0.03

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.

15GV55    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        31.315    31.338    31.291
ecceobj         0.304     0.305     0.304
incobj         28.357    28.357    28.358
qmin           20.901    21.778    20.493
qmax           41.384    41.266    43.272
amean          31.115    31.509    31.718
amin           30.681    31.063    30.748
amax           32.139    32.347    32.749
emean           0.221     0.219     0.243
emin            0.060     0.105     0.063
emax            0.325     0.306     0.352
imean          30.272    30.581    28.937
imin           27.589    28.564    24.965
imax           32.972    32.468    32.587
excite_mean     0.557     0.557     0.547
fracstop        0.177     0.034     0.438
cjmean          2.683     2.681     2.694

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       193.2     246.3     184.4
kozaiamp         67.1      10.3      72.0