Orbit Fit and Astrometric record for 15GW55

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: 15GW55    
# Created Wed Dec  8 02:13:20 2021
# Orbit generated from Bernstein formalism
# Fitting     38 observations of     39
# Arc:   2.25y
# First observation: 2015/02/17
#  Last observation: 2017/05/18
Preliminary a, adot, b, bdot, g, gdot:
  -0.000149   0.013453  -0.000005  -0.003359   0.017302   0.000000
# Chi-squared of fit:     7.05 DOF:     70 RMS:  0.08
# Min/Max residuals:    -0.24    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.148573E-05  1.345883E-02 -3.161230E-06 -3.397958E-03  1.746861E-02  9.166036E-03
# Covariance matrix:
  2.6643E-13 -7.2078E-15  1.4090E-14 -7.9374E-14  2.6984E-13  1.4940E-11
 -7.2078E-15  1.6971E-13  8.7380E-15 -4.7355E-14  1.3117E-13  8.8774E-12
  1.4090E-14  8.7380E-15  9.8162E-14 -9.6858E-14  2.5308E-14  2.0960E-12
 -7.9374E-14 -4.7355E-14 -9.6858E-14  1.8771E-13 -1.4008E-13 -1.1093E-11
  2.6984E-13  1.3117E-13  2.5308E-14 -1.4008E-13  4.3657E-13  2.6319E-11
  1.4940E-11  8.8774E-12  2.0960E-12 -1.1093E-11  2.6319E-11  2.0742E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.778540 -155.195309    0.821054    0.026538   -0.544028  2457071.138488
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:           27.58299 +/-     0.253
Argument of Peri:       73.47410 +/-     0.029
Long of Asc Node:       34.91486 +/-     0.001
Inclination:            14.22917 +/-     0.001
Eccentricity:         0.60904365 +/-    0.0030
Semi-Major Axis:     86.74644968 +/-    0.5080
Time of Perihelion: 2434459.7570 +/-      59.4
Perihelion:          33.91407537 +/-    0.3293
Aphelion:           139.57882399 +/-    0.8586
Period (y)              807.9524 +/-      7.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -52.74478965 +/-    0.0020
Ecliptic Y          -23.47098418 +/-    0.0009
Ecliptic Z            2.77484223 +/-    0.0001
Ecliptic XDOT        -0.00044466 +/-    0.0000
Ecliptic YDOT        -0.00253317 +/-    0.0000
Ecliptic ZDOT        -0.00046220 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   57.79792110 +/-    0.0018
Geocenter to KBO     57.24554231 +/-    0.0022
# Hcoef:  6.71

The following table shows the complete astrometric record for 15GW55. 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 (15GW55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.63771  13 36 00.757  -07 01 10.02  23.2r 15GW55    568  C~2lVC      
2015 03  18.57516  13 34 51.925  -06 54 25.98  24.1r 15GW55    568  C~2lVC      
2015 03  18.62254  13 34 51.775  -06 54 25.13  24.2r 15GW55    568  C~2lVC      
2015 03  20.57938  13 34 45.861  -06 53 51.92  24.4r 15GW55    568  C~2lVC      
2015 04  11.51365  13 33 33.642  -06 47 17.07  23.8r 15GW55    568  C~2lVC      
2015 04  13.37789  13 33 27.229  -06 46 43.13  24.9r 15GW55    568  C~2lVC      
2015 04  13.41891  13 33 27.095  -06 46 42.43  24.5r 15GW55    568  C~2lVC      
2015 04  13.42365  13 33 27.075  -06 46 42.30  24.3r 15GW55    568  C~2lVC      
2015 04  13.42846  13 33 27.047  -06 46 42.31  24.4r 15GW55    568  C~2lVC      
2015 04  13.43331  13 33 27.031  -06 46 42.11  24.4r 15GW55    568  C~2lVC      
2015 04  13.43815  13 33 27.020  -06 46 41.95  24.3r 15GW55    568  C~2lVC      
2015 04  13.52145  13 33 26.728  -06 46 40.38  23.9r 15GW55    568  C~2lVC      
2015 04  19.48929  13 33 06.158  -06 44 52.57  24.3r 15GW55    568  C~2lVC      
2015 04  19.53630  13 33 05.982  -06 44 51.82  24.7r 15GW55    568  C~2lVC      
2015 05  18.34130  13 31 33.428  -06 37 17.05  24.4r 15GW55    568  C~2lVC      
2015 06  20.29133  13 30 24.238  -06 32 53.73  24.5r 15GW55    568  C~2lVC      
2015 06  20.33212  13 30 24.190  -06 32 53.55  24.6r 15GW55    568  C~2lVC      
2015 06  22.33610  13 30 21.838  -06 32 49.40  24.3r 15GW55    568  C~2lVC      
2015 07  14.28829  13 30 12.053  -06 33 41.23  24.4r 15GW55    568  C~2lVC      
2015 07  20.28135  13 30 14.659  -06 34 26.72  25.2r 15GW55    568  C~2lVC      
2016 02  04.56733  13 38 52.299  -07 30 19.11  23.9w 15GW55    568  C~2lVC      
2016 02  04.57962  13 38 52.295  -07 30 19.07  24.0w 15GW55    568  C~2lVC      
2016 02  10.55526  13 38 46.549  -07 29 41.38  24.7w 15GW55    568  C~2lVC      
2016 02  10.56746  13 38 46.517  -07 29 41.24  24.6w 15GW55    568  C~2lVC      
2016 02  10.60492  13 38 46.518  -07 29 41.08  24.7w 15GW55    568  C~2lVC      
2016 02  11.57713  13 38 45.340  -07 29 33.71  25.2w 15GW55    568  C~2lVC      
2016 03  11.55250  13 37 46.787  -07 23 48.63  24.6w 15GW55    568  C~2lVC      
2016 03  12.47618  13 37 44.253  -07 23 34.18  24.3w 15GW55    568  C~2lVC      
2016 04  03.45339  13 36 36.281  -07 17 19.47  24.4w 15GW55    568  C~2lVC      
2016 04  09.43453  13 36 16.066  -07 15 31.43  24.3w 15GW55    568  C~2lVC      
2016 05  02.32746  13 34 58.602  -07 08 53.73  24.4w 15GW55    568  C~2lVC      
2016 05  06.33724  13 34 45.680  -07 07 50.35  24.4w 15GW55    568  C~2lVC      
2016 05  28.29624  13 33 43.434  -07 03 04.83  24.4w 15GW55    568  C~2lVC      
2016 05  28.30839  13 33 43.403  -07 03 04.68  24.3w 15GW55    568  C~2lVC      
2016 05  29.31531  13 33 40.989  -07 02 54.61  24.9w 15GW55    568  C~2lVC      
2016 06  04.37369  13 33 27.434  -07 02 00.37  25.0w 15GW55    568  C~2lVC      
2016 06  27.34232  13 32 53.623  -07 00 25.17  24.4w 15GW55    568  C~2lVC      
2016 07  07.33209  13 32 48.564  -07 00 42.55  24.7w 15GW55    568  C~2lVC      
2017 05  18.26658  13 36 46.420  -07 32 24.62  24.1w 15GW55    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     0.14       0.00     0.02
     2   0.0792  -1101.64    -0.04       3.17    -0.03
     3   0.0794  -1104.03    -0.14       3.14    -0.02
     4   0.0847  -1198.15    -0.11       1.98    -0.13
     5   0.1448  -2343.72    -0.02     -22.64     0.04
     6   0.1499  -2445.06     0.01     -25.91    -0.03
     7   0.1500  -2447.17     0.16     -25.99    -0.02
     8   0.1500  -2447.49     0.10     -25.98    -0.00
     9   0.1500  -2447.88    -0.02     -26.14    -0.15
    10   0.1500  -2448.17    -0.04     -26.04    -0.04
    11   0.1500  -2448.38     0.01     -25.95     0.06
    12   0.1503  -2453.01    -0.00     -26.08     0.10
    13   0.1666  -2777.67     0.15     -37.59     0.20
    14   0.1667  -2780.39     0.02     -37.85     0.05
    15   0.2456  -4230.49     0.08    -118.69    -0.08
    16   0.3358  -5286.87    -0.06    -251.29    -0.07
    17   0.3359  -5287.60    -0.02    -251.38     0.03
    18   0.3414  -5321.76     0.05    -260.37     0.04
    19   0.4015  -5438.50    -0.21    -362.08     0.04
    20   0.4179  -5385.66    -0.04    -390.18     0.06
    21   0.9635   3013.58    -0.07    -703.03    -0.00
    22   0.9636   3013.51     0.02    -703.01     0.01
    23   0.9799   2920.19     0.02    -698.84    -0.02
    24   0.9800   2919.69    -0.24    -698.89    -0.06
    25   0.9801   2919.65 (   0.45)   -698.73 (   0.08)
    26   0.9827   2900.64     0.05    -698.21    -0.02
    27   1.0621   1963.76     0.09    -692.43    -0.04
    28   1.0646   1923.39    -0.07    -692.65     0.03
    29   1.1248    845.07     0.07    -710.81    -0.01
    30   1.1411    525.58    -0.03    -719.53     0.06
    31   1.2038   -692.90     0.07    -768.73    -0.00
    32   1.2148   -895.10     0.00    -779.79     0.02
    33   1.2749  -1862.02     0.03    -851.85    -0.00
    34   1.2749  -1862.50     0.01    -851.88     0.02
    35   1.2777  -1899.64     0.04    -855.62     0.00
    36   1.2943  -2107.33    -0.01    -878.79    -0.11
    37   1.3572  -2610.76    -0.07    -974.02    -0.07
    38   1.3845  -2674.54     0.00   -1017.72     0.12
    39   2.2468   1314.58     0.05   -1499.28     0.01

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.

15GW55    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        85.228    86.644    83.877
ecceobj         0.605     0.613     0.597
incobj         14.292    14.292    14.292
qmin           32.879    32.730    33.197
qmax          147.857   147.199   143.408
amean          87.549    86.473    85.323
amin           83.999    81.881    82.676
amax           90.897    90.753    89.203
emean           0.611     0.607     0.595
emin            0.587     0.577     0.579
emax            0.629     0.628     0.611
imean          14.233    14.480    14.942
imin           13.250    13.298    13.564
imax           16.428    16.033    16.419
excite_mean     0.659     0.657     0.649
fracstop        1.000     1.000     1.000
cjmean          2.960     2.956     2.966

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       166.3     168.8     168.6
kozaiamp        180.0     180.0     180.0