Orbit Fit and Astrometric record for 15GQ56

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: 15GQ56    
# Created Tue Dec  7 02:13:23 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     41 observations of     41
# Arc:   6.09y
# First observation: 2015/02/17
#  Last observation: 2021/03/20
# Chi-squared of fit:     6.78 DOF:     76 RMS:  0.07
# Min/Max residuals:    -0.19    0.22
# Exact a, adot, b, bdot, g, gdot:
  1.308672E-05  1.785243E-02 -3.918391E-06 -5.842978E-03  2.152889E-02 -5.726702E-04
# Covariance matrix:
  1.4991E-13 -5.3492E-14 -4.8190E-15  1.0995E-14  8.6079E-14 -3.1487E-13
 -5.3492E-14  1.4651E-13  1.9451E-14 -4.5864E-14  3.3238E-14  1.3350E-12
 -4.8190E-15  1.9451E-14  5.3156E-14 -2.4469E-14  5.9493E-15  2.0681E-13
  1.0995E-14 -4.5864E-14 -2.4469E-14  3.7351E-14 -1.4422E-14 -4.8791E-13
  8.6079E-14  3.3238E-14  5.9493E-15 -1.4422E-14  1.1104E-13  4.2529E-13
 -3.1487E-13  1.3350E-12  2.0681E-13 -4.8791E-13  4.2529E-13  1.4206E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.652388 -156.282032    0.811966    0.006503   -0.558090  2457070.998808
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          208.74944 +/-     0.089
Argument of Peri:      334.14815 +/-     0.089
Long of Asc Node:       24.69786 +/-     0.000
Inclination:            18.10654 +/-     0.000
Eccentricity:         0.10029631 +/-    0.0001
Semi-Major Axis:     43.13546287 +/-    0.0023
Time of Perihelion: 2500546.0026 +/-      26.2
Perihelion:          38.80913523 +/-    0.0050
Aphelion:            47.46179051 +/-    0.0053
Period (y)              283.3087 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -43.36356405 +/-    0.0007
Ecliptic Y          -18.16335864 +/-    0.0003
Ecliptic Z            0.52868605 +/-    0.0000
Ecliptic XDOT         0.00096847 +/-    0.0000
Ecliptic YDOT        -0.00205823 +/-    0.0000
Ecliptic ZDOT        -0.00074375 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   47.01689559 +/-    0.0006
Geocenter to KBO     46.44925610 +/-    0.0007
# Hcoef:  7.21

The following table shows the complete astrometric record for 15GQ56. 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 (15GQ56) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.49803  13 28 47.346  -08 36 01.59  23.7r 15GQ56    568  C~2nvS      
2015 02  17.53937  13 28 47.254  -08 36 01.17  24.4r 15GQ56    568  C~2nvS      
2015 02  20.46602  13 28 40.701  -08 35 30.71  24.0r 15GQ56    568  C~2nvS      
2015 03  18.46248  13 27 19.791  -08 28 51.76  24.3r 15GQ56    568  C~2nvS      
2015 03  18.51370  13 27 19.587  -08 28 50.84  24.1r 15GQ56    568  C~2nvS      
2015 03  20.51543  13 27 12.000  -08 28 12.33  24.5r 15GQ56    568  C~2nvS      
2015 04  11.40623  13 25 42.240  -08 20 35.98  23.7r 15GQ56    568  C~2nvS      
2015 04  12.35891  13 25 38.197  -08 20 15.33  24.1r 15GQ56    568  C~2nvS      
2015 04  12.39987  13 25 38.004  -08 20 14.50  24.2r 15GQ56    568  C~2nvS      
2015 04  12.44684  13 25 37.807  -08 20 13.45  23.5r 15GQ56    568  C~2nvS      
2015 04  14.45679  13 25 29.245  -08 19 29.97  23.7r 15GQ56    568  C~2nvS      
2015 04  16.39466  13 25 20.995  -08 18 48.04  23.6r 15GQ56    568  C~2nvS      
2015 04  16.40115  13 25 20.976  -08 18 47.97  23.5r 15GQ56    568  C~2nvS      
2015 04  18.41739  13 25 12.400  -08 18 04.48  23.5r 15GQ56    568  C~2nvS      
2015 04  18.46519  13 25 12.192  -08 18 03.70  24.8r 15GQ56    568  C~2nvS      
2015 05  16.26178  13 23 22.261  -08 08 57.85  23.7r 15GQ56    568  C~2nvS      
2015 05  25.36747  13 22 52.397  -08 06 37.16  24.1r 15GQ56    568  C~2nvS      
2015 05  25.40947  13 22 52.271  -08 06 36.60  23.7r 15GQ56    568  C~2nvS      
2015 05  25.41889  13 22 52.227  -08 06 36.50  23.4r 15GQ56    568  C~2nvS      
2015 05  25.42508  13 22 52.227  -08 06 36.42  23.6r 15GQ56    568  C~2nvS      
2015 06  21.31770  13 21 52.978  -08 02 35.77  23.5r 15GQ56    568  C~2nvS      
2015 06  22.27415  13 21 51.790  -08 02 32.78  23.6r 15GQ56    568  C~2nvS      
2015 07  12.26825  13 21 42.911  -08 03 04.73  25.0r 15GQ56    568  C~2nvS      
2015 07  15.25837  13 21 44.260  -08 03 25.43  23.7r 15GQ56    568  C~2nvS      
2015 07  19.25817  13 21 47.149  -08 03 59.35  24.3r 15GQ56    568  C~2nvS      
2016 02  04.55924  13 32 30.126  -09 18 39.57  23.6w 15GQ56    568  C~2nvS      
2016 02  10.54717  13 32 22.331  -09 18 12.74  25.1w 15GQ56    568  C~2nvS      
2016 02  10.59675  13 32 22.237  -09 18 12.36  24.1w 15GQ56    568  C~2nvS      
2016 03  11.55881  13 31 05.082  -09 12 19.42  23.9w 15GQ56    568  C~2nvS      
2016 04  03.44530  13 29 36.114  -09 04 57.40  24.6w 15GQ56    568  C~2nvS      
2016 04  09.42510  13 29 10.811  -09 02 50.29  23.5w 15GQ56    568  C~2nvS      
2016 05  01.36049  13 27 38.520  -08 55 07.52  23.7w 15GQ56    568  C~2nvS      
2016 05  02.30311  13 27 34.728  -08 54 48.89  23.7w 15GQ56    568  C~2nvS      
2016 05  06.31289  13 27 18.836  -08 53 30.26  23.8w 15GQ56    568  C~2nvT      
2016 05  28.28409  13 26 03.177  -08 47 26.69  23.6w 15GQ56    568  C~2nvT      
2016 06  04.36558  13 25 44.123  -08 46 01.12  24.3w 15GQ56    568  C~2nvT      
2016 06  27.29295  13 25 05.589  -08 43 40.62  24.3w 15GQ56    568  C~2nvT      
2016 07  07.29554  13 25 01.002  -08 43 51.41  23.8w 15GQ56    568  C~2nvT      
2017 03  29.44993  13 33 22.546  -09 48 29.16  24.3w 15GQ56    568  C~2nvT      
2021 03  20.428810 13 47 48.356  -12 37 12.03  23.6G 15GQ56    G37  C~4iAL      
2021 03  20.477610 13 47 48.155  -12 37 10.96        15GQ56    G37  C~4iAL      

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   0.0001      0.00    -0.04       0.00    -0.05
     3   0.0081      0.00    -0.06       0.00     0.03
     4   0.0793      0.00    -0.01       0.00     0.04
     5   0.0794      0.00    -0.13       0.00    -0.01
     6   0.0849      0.00    -0.00       0.00     0.09
     7   0.1449      0.00     0.03       0.00    -0.02
     8   0.1475      0.00     0.16       0.00     0.02
     9   0.1476      0.00    -0.08       0.00    -0.04
    10   0.1477      0.00     0.02       0.00    -0.00
    11   0.1532      0.00     0.01       0.00     0.00
    12   0.1585      0.00    -0.06       0.00     0.09
    13   0.1585      0.00     0.08       0.00     0.02
    14   0.1641      0.00    -0.03       0.00     0.11
    15   0.1642      0.00    -0.05       0.00    -0.14
    16   0.2403      0.00     0.02       0.00    -0.01
    17   0.2652      0.00    -0.03       0.00     0.01
    18   0.2653      0.00     0.03       0.00    -0.02
    19   0.2654      0.00    -0.19       0.00    -0.06
    20   0.2654      0.00     0.10       0.00    -0.06
    21   0.3390      0.00    -0.00       0.00     0.03
    22   0.3416      0.00    -0.05       0.00    -0.01
    23   0.3964      0.00    -0.05       0.00    -0.06
    24   0.4045      0.00     0.06       0.00    -0.11
    25   0.4155      0.00     0.03       0.00     0.09
    26   0.9639      0.00     0.03       0.00    -0.01
    27   0.9803      0.00     0.20       0.00     0.00
    28   0.9804      0.00    -0.00       0.00     0.10
    29   1.0625      0.00    -0.11       0.00    -0.03
    30   1.1251      0.00    -0.01       0.00     0.02
    31   1.1415      0.00    -0.04       0.00    -0.00
    32   1.2015      0.00     0.02       0.00     0.22
    33   1.2041      0.00     0.07       0.00    -0.02
    34   1.2151      0.00    -0.04       0.00    -0.01
    35   1.2753      0.00    -0.00       0.00     0.03
    36   1.2946      0.00    -0.03       0.00     0.02
    37   1.3574      0.00    -0.04       0.00    -0.02
    38   1.3848      0.00     0.02       0.00     0.00
    39   2.1108      0.00     0.00       0.00    -0.05
    40   6.0861      0.00     0.11       0.00    -0.15
    41   6.0862      0.00    -0.13       0.00     0.13

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.

15GQ56    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        42.795    42.795    42.795
ecceobj         0.109     0.109     0.109
incobj         18.197    18.197    18.197
qmin           37.609    37.611    37.612
qmax           48.747    48.809    48.881
amean          43.064    43.064    43.065
amin           42.716    42.716    42.715
amax           43.437    43.439    43.457
emean           0.109     0.109     0.109
emin            0.095     0.095     0.095
emax            0.123     0.124     0.125
imean          17.533    17.532    17.533
imin           17.010    17.009    17.016
imax           18.105    18.105    18.105
excite_mean     0.320     0.320     0.320
fracstop        1.000     1.000     1.000
cjmean          2.966     2.966     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       172.7     172.7     172.6
kozaiamp        179.9     180.0     179.9