Orbit Fit and Astrometric record for 15GQ55

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: 15GQ55    
# Created Tue Dec  7 02:13:22 2021
# Orbit generated from Bernstein formalism
# Fitting     40 observations of     40
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000089   0.020969  -0.000007   0.007884   0.023450   0.000000
# Chi-squared of fit:    11.56 DOF:     74 RMS:  0.10
# Min/Max residuals:    -0.21    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.334930E-05  2.086378E-02  4.832949E-06  7.832651E-03  2.345818E-02 -1.764606E-03
# Covariance matrix:
  1.6080E-13  7.5413E-15 -9.2884E-15  3.8144E-14  1.2862E-13  2.4712E-12
  7.5413E-15  1.8088E-13 -1.9663E-14  8.3973E-14  1.3932E-13  5.4534E-12
 -9.2884E-15 -1.9663E-14  8.3899E-14 -7.8416E-14 -2.3870E-14 -1.2264E-12
  3.8144E-14  8.3973E-14 -7.8416E-14  1.6354E-13  1.0049E-13  5.2903E-12
  1.2862E-13  1.3932E-13 -2.3870E-14  1.0049E-13  2.2889E-13  6.5204E-12
  2.4712E-12  5.4534E-12 -1.2264E-12  5.2903E-12  6.5204E-12  3.4377E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.548787 -154.942271    0.824715    0.014718   -0.538911  2457071.006958
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          272.68241 +/-     0.087
Argument of Peri:      102.49422 +/-     0.064
Long of Asc Node:      199.90189 +/-     0.000
Inclination:            20.66399 +/-     0.001
Eccentricity:         0.09474937 +/-    0.0008
Semi-Major Axis:     42.98378054 +/-    0.0069
Time of Perihelion: 2482036.8235 +/-      24.1
Perihelion:          38.91109440 +/-    0.0356
Aphelion:            47.05646668 +/-    0.0359
Period (y)              281.8157 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -39.44320313 +/-    0.0008
Ecliptic Y          -17.52928925 +/-    0.0004
Ecliptic Z            1.15238458 +/-    0.0000
Ecliptic XDOT         0.00123655 +/-    0.0000
Ecliptic YDOT        -0.00211378 +/-    0.0000
Ecliptic ZDOT         0.00090836 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.17835390 +/-    0.0007
Geocenter to KBO     42.62905347 +/-    0.0009
# Hcoef:  8.10

The following table shows the complete astrometric record for 15GQ55. 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 (15GQ55) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.50618  13 35 09.408  -08 15 24.81  24.8r 15GQ55    568  C~2lVB      
2015 02  17.54752  13 35 09.308  -08 15 24.11  24.4r 15GQ55    568  C~2lVB      
2015 02  20.47836  13 35 03.252  -08 14 29.08  24.5r 15GQ55    568  C~2lVB      
2015 03  18.47955  13 33 44.059  -08 04 02.11  24.3r 15GQ55    568  C~2lVB      
2015 03  18.48429  13 33 44.037  -08 04 01.95  24.4r 15GQ55    568  C~2lVB      
2015 03  18.52590  13 33 43.883  -08 04 00.79  24.5r 15GQ55    568  C~2lVB      
2015 03  20.52796  13 33 36.223  -08 03 04.30  24.4r 15GQ55    568  C~2lVB      
2015 04  11.41852  13 32 04.586  -07 52 09.66  24.1r 15GQ55    568  C~2lVB      
2015 04  12.37119  13 32 00.411  -07 51 40.66  24.6r 15GQ55    568  C~2lVB      
2015 04  12.42087  13 32 00.189  -07 51 38.71  24.2r 15GQ55    568  C~2lVB      
2015 04  12.45912  13 32 00.012  -07 51 37.95  24.2r 15GQ55    568  C~2lVB      
2015 04  14.46908  13 31 51.202  -07 50 36.45  25.0r 15GQ55    568  C~2lVB      
2015 04  18.42971  13 31 33.779  -07 48 35.39  24.2r 15GQ55    568  C~2lVB      
2015 04  18.47743  13 31 33.567  -07 48 34.32  24.8r 15GQ55    568  C~2lVB      
2015 05  16.27640  13 29 39.284  -07 35 30.17  24.3r 15GQ55    568  C~2lVB      
2015 05  25.38047  13 29 08.171  -07 31 57.15  24.2r 15GQ55    568  C~2lVB      
2015 05  25.43825  13 29 07.971  -07 31 55.94  24.3r 15GQ55    568  C~2lVB      
2015 06  20.27906  13 28 08.264  -07 24 52.96  24.5r 15GQ55    568  C~2lVB      
2015 06  20.31989  13 28 08.209  -07 24 52.49  24.4r 15GQ55    568  C~2lVB      
2015 06  22.28659  13 28 05.689  -07 24 32.94  24.5r 15GQ55    568  C~2lVB      
2015 07  14.27603  13 27 59.183  -07 23 05.89  24.2r 15GQ55    568  C~2lVB      
2015 07  20.26893  13 28 04.507  -07 23 24.39  24.5r 15GQ55    568  C~2lVB      
2016 02  04.59812  13 40 37.253  -08 19 40.95  25.0w 15GQ55    568  C~2lVB      
2016 02  10.61713  13 40 31.269  -08 18 20.77  25.3w 15GQ55    568  C~2lVB      
2016 03  11.56297  13 39 19.147  -08 07 51.16  23.6w 15GQ55    568  C~2lVB      
2016 04  03.45339  13 37 49.593  -07 56 54.85  24.5w 15GQ55    568  C~2lVB      
2016 04  09.43453  13 37 23.653  -07 53 52.92  24.5w 15GQ55    568  C~2lVB      
2016 05  02.32746  13 35 44.021  -07 42 31.67  24.5w 15GQ55    568  C~2lVB      
2016 05  06.33724  13 35 27.430  -07 40 40.14  24.7w 15GQ55    568  C~2lVB      
2016 05  28.29624  13 34 08.161  -07 31 50.72  24.8w 15GQ55    568  C~2lVB      
2016 05  28.30839  13 34 08.128  -07 31 50.45  24.9w 15GQ55    568  C~2lVB      
2016 05  29.31531  13 34 05.090  -07 31 30.25  24.5w 15GQ55    568  C~2lVB      
2016 06  04.37369  13 33 48.176  -07 29 36.83  24.7w 15GQ55    568  C~2lVB      
2016 06  27.33366  13 33 08.011  -07 24 57.97  24.5w 15GQ55    568  C~2lVB      
2016 06  27.34232  13 33 08.020  -07 24 57.82  25.2w 15GQ55    568  C~2lVB      
2016 07  07.32400  13 33 03.653  -07 24 17.07  24.7w 15GQ55    568  C~2lVB      
2016 07  07.33209  13 33 03.666  -07 24 16.98  24.6w 15GQ55    568  C~2lVC      
2017 03  30.48302  13 43 22.582  -07 59 52.60        15GQ55    568  C~2lVC      
2017 05  18.26658  13 39 56.176  -07 36 36.27  24.3w 15GQ55    568  C~2lVC      
2017 06  24.30392  13 38 21.217  -07 26 20.94  24.3w 15GQ55    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     0.15       0.00     0.09
     2   0.0001     -1.64    -0.06       0.11    -0.04
     3   0.0081   -105.40    -0.08      18.63    -0.05
     4   0.0793  -1428.95     0.00     173.78     0.02
     5   0.0793  -1429.32    -0.06     173.81     0.02
     6   0.0795  -1431.87     0.03     174.05     0.06
     7   0.0849  -1558.41    -0.11     185.13     0.03
     8   0.1449  -3065.00    -0.10     297.03     0.09
     9   0.1475  -3133.36    -0.02     301.32    -0.08
    10   0.1476  -3137.14    -0.17     301.93     0.32
    11   0.1477  -3139.87    -0.10     301.67    -0.09
    12   0.1532  -3284.24     0.23     311.00     0.01
    13   0.1641  -3569.57    -0.07     328.89     0.16
    14   0.1642  -3572.90     0.09     328.73    -0.18
    15   0.2403  -5441.80     0.18     435.42     0.04
    16   0.2652  -5950.73     0.07     463.63    -0.08
    17   0.2654  -5953.94    -0.09     463.66    -0.21
    18   0.3361  -6936.23     0.00     530.53    -0.06
    19   0.3362  -6937.16     0.04     530.66     0.00
    20   0.3416  -6979.26     0.05     535.05    -0.03
    21   0.4018  -7101.43    -0.05     580.40    -0.12
    22   0.4182  -7020.89    -0.03     592.35     0.08
    23   0.9640   4628.96     0.09    1525.65    -0.07
    24   0.9805   4517.14     0.15    1568.37    -0.11
    25   1.0624   3290.79    -0.03    1768.51    -0.05
    26   1.1251   1813.01    -0.01    1898.52     0.01
    27   1.1415   1387.84    -0.09    1928.26     0.01
    28   1.2042   -239.23     0.03    2025.01     0.05
    29   1.2151   -509.54    -0.05    2039.16     0.08
    30   1.2753  -1800.11    -0.05    2102.87    -0.05
    31   1.2753  -1800.67     0.01    2102.94     0.00
    32   1.2781  -1850.11    -0.00    2105.28    -0.08
    33   1.2946  -2125.72     0.02    2119.14     0.08
    34   1.3575  -2783.81    -0.00    2160.73     0.03
    35   1.3575  -2783.74     0.20    2160.92     0.21
    36   1.3849  -2859.11    -0.13    2175.14    -0.12
    37   1.3849  -2858.97     0.03    2175.29     0.03
    38   2.1136   6492.92    -0.02    3519.70    -0.08
    39   2.2471   3126.02    -0.02    3716.07    -0.04
    40   2.3485   1586.48    -0.03    3778.53     0.09

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.

15GQ55    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        42.631    42.647    42.615
ecceobj         0.098     0.100     0.096
incobj         20.763    20.763    20.764
qmin           38.234    38.203    38.322
qmax           47.793    47.891    47.727
amean          42.891    42.908    42.889
amin           42.538    42.567    42.532
amax           43.254    43.267    43.259
emean           0.092     0.093     0.090
emin            0.079     0.081     0.076
emax            0.105     0.107     0.104
imean          21.200    21.208    21.208
imin           20.755    20.757    20.756
imax           21.617    21.626    21.615
excite_mean     0.373     0.374     0.373
fracstop        1.000     1.000     1.000
cjmean          2.918     2.917     2.918

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       186.1     186.0     184.4
kozaiamp        180.0     180.0     180.0