Orbit Fit and Astrometric record for 15GA55

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: 15GA55    
# Created Sat Nov 27 02:13:22 2021
# Orbit generated from Bernstein formalism
# Fitting     30 observations of     30
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000049   0.027060   0.000020  -0.008761   0.024990   0.000000
# Chi-squared of fit:     4.59 DOF:     54 RMS:  0.07
# Min/Max residuals:    -0.17    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.628128E-05  2.678670E-02 -5.587528E-06 -8.647534E-03  2.488644E-02 -4.470279E-03
# Covariance matrix:
  1.7343E-13 -2.3033E-14  4.5773E-15 -2.1090E-14  1.0930E-13  1.2362E-12
 -2.3033E-14  3.5482E-13  2.9658E-14 -1.3070E-13  1.9671E-13  7.6081E-12
  4.5773E-15  2.9658E-14  1.0992E-13 -9.3569E-14  2.0984E-14  9.1524E-13
 -2.1090E-14 -1.3070E-13 -9.3569E-14  1.7341E-13 -9.3576E-14 -4.0261E-12
  1.0930E-13  1.9671E-13  2.0984E-14 -9.3576E-14  2.3414E-13  5.4574E-12
  1.2362E-12  7.6081E-12  9.1524E-13 -4.0261E-12  5.4574E-12  2.3430E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.895601 -152.491504    0.846865    0.008017   -0.503542  2457071.023648
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          344.60402 +/-     0.032
Argument of Peri:      213.75329 +/-     0.087
Long of Asc Node:       29.04592 +/-     0.000
Inclination:            17.93874 +/-     0.001
Eccentricity:         0.38972457 +/-    0.0004
Semi-Major Axis:     62.99451710 +/-    0.0242
Time of Perihelion: 2464880.6133 +/-      15.6
Perihelion:          38.44400579 +/-    0.0299
Aphelion:            87.54502840 +/-    0.0425
Period (y)              499.9912 +/-      0.29
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.47577565 +/-    0.0007
Ecliptic Y          -18.03871286 +/-    0.0004
Ecliptic Z            0.62784691 +/-    0.0000
Ecliptic XDOT         0.00178041 +/-    0.0000
Ecliptic YDOT        -0.00239905 +/-    0.0000
Ecliptic ZDOT        -0.00095883 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.69731641 +/-    0.0006
Geocenter to KBO     40.18252908 +/-    0.0008
# Hcoef:  8.17

The following table shows the complete astrometric record for 15GA55. 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 (15GA55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.52287  13 43 27.327  -09 45 02.65  24.1r 15GA55    568  C~2lV9      
2015 02  17.56399  13 43 27.231  -09 45 02.27  24.5r 15GA55    568  C~2lV9      
2015 02  20.59770  13 43 20.854  -09 44 38.27  24.1r 15GA55    568  C~2lV9      
2015 03  18.50144  13 41 58.396  -09 38 40.21  24.6r 15GA55    568  C~2lV9      
2015 03  18.54235  13 41 58.225  -09 38 39.31  24.4r 15GA55    568  C~2lV9      
2015 03  20.54594  13 41 50.095  -09 38 02.35  24.1r 15GA55    568  C~2lV9      
2015 04  11.48071  13 40 11.636  -09 30 27.49  24.0r 15GA55    568  C~2lV9      
2015 04  12.38760  13 40 07.345  -09 30 07.43  24.6r 15GA55    568  C~2lV9      
2015 04  12.43323  13 40 07.124  -09 30 06.52  24.1r 15GA55    568  C~2lV9      
2015 04  12.47547  13 40 06.915  -09 30 05.51  24.2r 15GA55    568  C~2lV9      
2015 05  25.39688  13 36 57.370  -09 16 00.19  24.3r 15GA55    568  C~2lV9      
2015 05  25.45500  13 36 57.150  -09 15 59.20  24.3r 15GA55    568  C~2lV9      
2015 06  21.34643  13 35 45.650  -09 11 53.31  24.3r 15GA55    568  C~2lV9      
2015 06  22.30309  13 35 44.145  -09 11 50.69  24.1r 15GA55    568  C~2lV9      
2015 07  12.29701  13 35 30.871  -09 12 40.40  24.5r 15GA55    568  C~2lV9      
2015 07  19.28682  13 35 34.732  -09 13 46.75  24.3r 15GA55    568  C~2lV9      
2016 02  04.63543  13 48 52.615  -10 46 28.09  24.4w 15GA55    568  C~2lV9      
2016 02  11.61375  13 48 45.804  -10 46 22.28  24.5w 15GA55    568  C~2lV9      
2016 03  11.61710  13 47 32.507  -10 41 51.86  24.5w 15GA55    568  C~2lV9      
2016 03  12.48956  13 47 29.346  -10 41 38.30  24.3w 15GA55    568  C~2lV9      
2016 04  09.46692  13 45 28.766  -10 32 44.81  24.3w 15GA55    568  C~2lV9      
2016 05  02.35585  13 43 39.694  -10 24 32.54  24.2w 15GA55    568  C~2lV9      
2016 05  07.35921  13 43 16.840  -10 22 50.83  24.1w 15GA55    568  C~2lV9      
2016 05  29.33148  13 41 48.796  -10 16 34.06  24.4w 15GA55    568  C~2lV9      
2016 06  04.39391  13 41 29.294  -10 15 17.39  24.7w 15GA55    568  C~2lV9      
2016 06  27.31561  13 40 40.710  -10 12 49.83  24.4w 15GA55    568  C~2lV9      
2016 07  07.31185  13 40 33.470  -10 13 04.53  24.2w 15GA55    568  C~2lV9      
2017 02  27.65350  13 53 26.472  -11 45 54.32        15GA55    568  C~2lV9      
2017 03  30.50649  13 51 32.686  -11 38 18.14  24.2w 15GA55    568  C~2lV9      
2017 06  26.27262  13 45 51.765  -11 14 20.86  24.8w 15GA55    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     0.15       0.00     0.02
     2   0.0001     -1.46    -0.04      -0.15     0.04
     3   0.0084    -98.08    -0.06     -11.50    -0.04
     4   0.0793  -1364.63     0.10    -114.36    -0.10
     5   0.0795  -1367.31    -0.00    -114.42     0.02
     6   0.0849  -1492.80    -0.09    -123.09    -0.10
     7   0.1450  -3015.46     0.00    -222.44    -0.04
     8   0.1475  -3081.92     0.04    -226.60     0.12
     9   0.1476  -3085.30     0.07    -226.93     0.03
    10   0.1477  -3088.55    -0.02    -227.10     0.08
    11   0.2652  -6011.08     0.09    -452.50    -0.03
    12   0.2654  -6014.47    -0.07    -452.76     0.05
    13   0.3390  -7091.27    -0.02    -607.74     0.06
    14   0.3416  -7113.01     0.04    -613.39     0.01
    15   0.3964  -7278.29    -0.09    -731.18    -0.00
    16   0.4155  -7200.83    -0.00    -772.25     0.01
    17   0.9640   5800.40    -0.05   -1735.01     0.04
    18   0.9831   5704.41    -0.02   -1765.11     0.05
    19   1.0625   4597.77     0.01   -1895.20    -0.17
    20   1.0649   4549.38    -0.06   -1899.06    -0.05
    21   1.1415   2697.51     0.06   -2032.86    -0.07
    22   1.2042   1018.78     0.05   -2147.63     0.09
    23   1.2179    667.51     0.02   -2173.36     0.05
    24   1.2781   -680.53     0.01   -2287.61    -0.02
    25   1.2947   -976.73    -0.07   -2319.48    -0.07
    26   1.3574  -1699.06    -0.09   -2439.77    -0.05
    27   1.3848  -1793.50    -0.08   -2491.97     0.01
    28   2.0291  10836.34    -0.04   -3657.01     0.09
    29   2.1136   9107.01    -0.05   -3816.18    -0.09
    30   2.3539   3904.26     0.20   -4245.29     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.

15GA55    quality flag:3

Type:          3:1EE     3:1EE     3:1EE

axisobj        62.106    62.159    62.054
ecceobj         0.383     0.384     0.382
incobj         18.008    18.008    18.008
qmin           37.128    37.638    36.921
qmax           89.701    89.330    89.777
amean          62.629    62.629    62.629
amin           61.765    61.713    61.777
amax           63.719    63.772    63.750
emean           0.388     0.386     0.388
emin            0.369     0.372     0.365
emax            0.408     0.401     0.411
imean          17.541    17.749    17.537
imin           16.699    17.238    16.430
imax           18.277    18.121    18.636
excite_mean     0.492     0.492     0.491
fracstop        1.000     1.000     1.000
cjmean          3.015     3.015     3.016

libcent 0       265.1     180.3     269.3
libamp  0        64.3     153.6      59.7
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       192.8     178.6     240.6
kozaiamp        180.0     180.0     180.0