Orbit Fit and Astrometric record for 15GY55

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: 15GY55    
# Created Sat Nov 27 02:13:23 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     48 observations of     48
# Arc:   6.24y
# First observation: 2015/02/17
#  Last observation: 2021/05/14
# Chi-squared of fit:     7.63 DOF:     90 RMS:  0.07
# Min/Max residuals:    -0.18    0.28
# Exact a, adot, b, bdot, g, gdot:
  2.114949E-05  3.728807E-02 -1.495784E-06 -2.580355E-03  2.797947E-02 -1.712508E-03
# Covariance matrix:
  1.3670E-13 -6.6897E-14 -2.7500E-15  4.8773E-15  7.4459E-14 -2.9075E-13
 -6.6897E-14  1.8287E-13  5.4364E-15 -1.3866E-14  2.8220E-14  8.2263E-13
 -2.7500E-15  5.4364E-15  4.8930E-14 -9.7552E-15 -3.3793E-16  2.5443E-14
  4.8773E-15 -1.3866E-14 -9.7552E-15  5.6474E-15 -1.7123E-15 -6.4118E-14
  7.4459E-14  2.8220E-14 -3.3793E-16 -1.7123E-15  1.0515E-13  9.9921E-14
 -2.9075E-13  8.2263E-13  2.5443E-14 -6.4118E-14  9.9921E-14  3.8045E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.786980 -153.135906    0.840398    0.025145   -0.513714  2457071.105668
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          358.39465 +/-     0.001
Argument of Peri:      154.62354 +/-     0.008
Long of Asc Node:       60.62778 +/-     0.001
Inclination:             4.76963 +/-     0.000
Eccentricity:         0.64767171 +/-    0.0001
Semi-Major Axis:    102.34170409 +/-    0.0179
Time of Perihelion: 2458756.8341 +/-      98.8
Perihelion:          36.05787768 +/-    0.0086
Aphelion:           168.62553049 +/-    0.0301
Period (y)             1035.3500 +/-      0.27
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.68695511 +/-    0.0004
Ecliptic Y          -15.61394467 +/-    0.0002
Ecliptic Z            1.73775354 +/-    0.0000
Ecliptic XDOT         0.00178347 +/-    0.0000
Ecliptic YDOT        -0.00319044 +/-    0.0000
Ecliptic ZDOT        -0.00026025 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   36.26645508 +/-    0.0003
Geocenter to KBO     35.74054668 +/-    0.0004
# Hcoef:  7.23

The following table shows the complete astrometric record for 15GY55. 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 (15GY55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.60489  13 43 45.734  -07 45 14.94  22.7r 15GY55    568  C~2lVD      
2015 02  17.64586  13 43 45.654  -07 45 14.36  22.8r 15GY55    568  C~2lVD      
2015 02  20.63905  13 43 39.681  -07 44 31.82  22.8r 15GY55    568  C~2lVD      
2015 03  18.58338  13 42 16.497  -07 35 45.01  22.8r 15GY55    568  C~2lVD      
2015 03  18.63265  13 42 16.288  -07 35 43.81  22.8r 15GY55    568  C~2lVD      
2015 03  20.58759  13 42 08.122  -07 34 55.12  22.8r 15GY55    568  C~2lVD      
2015 04  11.52247  13 40 25.780  -07 25 08.98  22.6r 15GY55    568  C~2lVD      
2015 04  13.38609  13 40 16.551  -07 24 17.90  22.7r 15GY55    568  C~2lVD      
2015 04  13.44737  13 40 16.241  -07 24 16.20  22.5r 15GY55    568  C~2lVD      
2015 04  13.45145  13 40 16.224  -07 24 16.07  22.6r 15GY55    568  C~2lVD      
2015 04  13.45555  13 40 16.199  -07 24 15.95  22.6r 15GY55    568  C~2lVD      
2015 04  13.52960  13 40 15.821  -07 24 13.93  22.7r 15GY55    568  C~2lVD      
2015 04  19.29039  13 39 47.11   -07 21 36.8   23.3V 15GY55    W84  C~2zsP      
2015 04  19.49744  13 39 46.088  -07 21 31.62  22.5r 15GY55    568  C~2lVD      
2015 04  19.54452  13 39 45.848  -07 21 30.51  22.8r 15GY55    568  C~2lVD      
2015 04  19.55519  13 39 45.794  -07 21 30.23  22.8r 15GY55    568  C~2lVD      
2015 04  21.29129  13 39 37.18   -07 20 43.2         15GY55    W84  C~2zsP      
2015 04  22.29094  13 39 32.20   -07 20 16.5         15GY55    W84  C~2zsP      
2015 05  18.34948  13 37 31.705  -07 10 02.66  22.7r 15GY55    568  C~2lVD      
2015 06  20.29948  13 35 55.374  -07 03 35.37  22.8r 15GY55    568  C~2lVD      
2015 06  20.34029  13 35 55.305  -07 03 35.23  22.9r 15GY55    568  C~2lVD      
2015 06  22.34439  13 35 52.387  -07 03 30.29  22.7r 15GY55    568  C~2lVD      
2015 07  14.29673  13 35 46.034  -07 05 11.00  22.8r 15GY55    568  C~2lVD      
2015 07  20.28959  13 35 52.705  -07 06 27.98  22.9r 15GY55    568  C~2lVD      
2016 02  04.52611  13 51 51.577  -08 41 10.66  23.2w 15GY55    568  C~2lVD      
2016 02  04.53313  13 51 51.575  -08 41 10.64  23.1w 15GY55    568  C~2lVD      
2016 02  04.58829  13 51 51.551  -08 41 10.36  23.1w 15GY55    568  C~2lVD      
2016 02  04.64815  13 51 51.523  -08 41 10.04  23.0w 15GY55    568  C~2lVD      
2016 03  11.61299  13 50 37.441  -08 32 48.55  23.0w 15GY55    568  C~2lVD      
2016 05  02.35180  13 46 37.081  -08 10 47.00  22.9w 15GY55    568  C~2lVD      
2016 05  29.33555  13 44 42.015  -08 01 37.20  23.0w 15GY55    568  C~2lVD      
2016 06  04.39796  13 44 22.112  -08 00 13.72  22.9w 15GY55    568  C~2lVD      
2016 06  27.32960  13 43 34.576  -07 57 50.57  23.2w 15GY55    568  C~2lVD      
2016 07  07.31994  13 43 29.284  -07 58 20.64  23.1w 15GY55    568  C~2lVD      
2017 03  30.52059  13 57 21.923  -09 19 48.42  23.0w 15GY55    568  C~2lVD      
2017 03  31.45585  13 57 17.628  -09 19 24.75  22.9w 15GY55    568  C~2lVD      
2021 05  13.98821  14 26 24.77   -12 33 53.0   23.2V 15GY55    W84  C~4n9b      
2021 05  14.00889  14 26 24.66   -12 33 52.5         15GY55    W84  C~4n9b      
2021 05  14.01234  14 26 24.65   -12 33 52.5         15GY55    W84  C~4n9b      
2021 05  14.01580  14 26 24.63   -12 33 52.3         15GY55    W84  C~4n9b      
2021 05  14.03998  14 26 24.50   -12 33 51.8         15GY55    W84  C~4n9b      
2021 05  14.04345  14 26 24.49   -12 33 51.8         15GY55    W84  C~4n9b      
2021 05  14.06415  14 26 24.39   -12 33 51.4         15GY55    W84  C~4n9b      
2021 05  14.06763  14 26 24.37   -12 33 51.3         15GY55    W84  C~4n9b      
2021 05  14.07110  14 26 24.35   -12 33 51.1         15GY55    W84  C~4n9b      
2021 05  14.09866  14 26 24.21   -12 33 50.6         15GY55    W84  C~4n9b      
2021 05  14.12281  14 26 24.09   -12 33 50.1         15GY55    W84  C~4n9b      
2021 05  14.14690  14 26 23.97   -12 33 49.6         15GY55    W84  C~4n9b      

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     0.01
     2   0.0001      0.00    -0.02       0.00     0.04
     3   0.0083      0.00    -0.04       0.00    -0.00
     4   0.0793      0.00    -0.01       0.00    -0.00
     5   0.0795      0.00    -0.03       0.00    -0.02
     6   0.0848      0.00    -0.02       0.00    -0.00
     7   0.1449      0.00     0.00       0.00    -0.04
     8   0.1500      0.00     0.01       0.00    -0.03
     9   0.1502      0.00     0.02       0.00    -0.01
    10   0.1502      0.00     0.07       0.00     0.01
    11   0.1502      0.00     0.01       0.00     0.02
    12   0.1504      0.00    -0.04       0.00     0.00
    13   0.1661      0.00    -0.18       0.00     0.26
    14   0.1667      0.00    -0.06       0.00     0.07
    15   0.1668      0.00    -0.08       0.00    -0.09
    16   0.1669      0.00    -0.08       0.00    -0.10
    17   0.1716      0.00     0.28       0.00     0.16
    18   0.1744      0.00     0.06       0.00     0.22
    19   0.2457      0.00     0.05       0.00     0.02
    20   0.3359      0.00     0.06       0.00    -0.04
    21   0.3360      0.00     0.03       0.00    -0.03
    22   0.3415      0.00     0.04       0.00     0.02
    23   0.4016      0.00    -0.03       0.00     0.04
    24   0.4180      0.00     0.02       0.00    -0.03
    25   0.9635      0.00     0.07       0.00    -0.03
    26   0.9635      0.00     0.08       0.00    -0.04
    27   0.9637      0.00     0.02       0.00    -0.01
    28   0.9638      0.00    -0.06       0.00     0.03
    29   1.0623      0.00    -0.08       0.00    -0.06
    30   1.2040      0.00     0.05       0.00    -0.04
    31   1.2778      0.00    -0.06       0.00    -0.06
    32   1.2944      0.00    -0.05       0.00    -0.03
    33   1.3572      0.00    -0.11       0.00    -0.10
    34   1.3846      0.00    -0.09       0.00    -0.04
    35   2.1134      0.00    -0.04       0.00    -0.07
    36   2.1160      0.00    -0.03       0.00    -0.01
    37   6.2351      0.00     0.06       0.00    -0.01
    38   6.2352      0.00    -0.04       0.00     0.04
    39   6.2352      0.00     0.07       0.00    -0.03
    40   6.2352      0.00     0.03       0.00     0.09
    41   6.2353      0.00    -0.10       0.00     0.07
    42   6.2353      0.00     0.01       0.00    -0.00
    43   6.2353      0.00     0.07       0.00    -0.05
    44   6.2354      0.00     0.03       0.00    -0.03
    45   6.2354      0.00    -0.01       0.00     0.10
    46   6.2354      0.00    -0.03       0.00    -0.00
    47   6.2355      0.00    -0.01       0.00    -0.03
    48   6.2356      0.00     0.01       0.00    -0.05

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.

15GY55    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        99.408    99.407    99.410
ecceobj         0.637     0.637     0.637
incobj          4.775     4.775     4.775
qmin           35.041    35.165    35.011
qmax          177.192   174.129   177.701
amean         101.665   100.799   102.091
amin           98.893    96.902    98.870
amax          106.615   105.108   106.863
emean           0.645     0.641     0.647
emin            0.631     0.625     0.632
emax            0.662     0.657     0.663
imean           3.361     3.616     3.486
imin            2.926     3.189     3.178
imax            3.904     4.141     3.904
excite_mean     0.648     0.644     0.649
fracstop        1.000     1.000     1.000
cjmean          3.100     3.101     3.099

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       198.3     196.2     190.6
kozaiamp        179.9     180.0     180.0