Orbit Fit and Astrometric record for 15GX54

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: 15GX54    
# Created Sat Nov 27 02:13:22 2021
# Orbit generated from Bernstein formalism
# Fitting     28 observations of     28
# Arc:   2.34y
# First observation: 2015/02/20
#  Last observation: 2017/06/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000167   0.035448   0.000014  -0.008392   0.030694   0.000000
# Chi-squared of fit:     4.63 DOF:     50 RMS:  0.07
# Min/Max residuals:    -0.19    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.824921E-05  3.522947E-02 -4.575167E-06 -8.346589E-03  3.075992E-02  3.291117E-04
# Covariance matrix:
  2.2598E-13 -2.5185E-14  3.3390E-15 -1.7967E-14  1.4848E-13  1.1027E-12
 -2.5185E-14  4.2641E-13  2.8886E-14 -1.2077E-13  2.2732E-13  7.2469E-12
  3.3390E-15  2.8886E-14  1.2467E-13 -9.9881E-14  1.8093E-14  6.7590E-13
 -1.7967E-14 -1.2077E-13 -9.9881E-14  1.5899E-13 -8.0150E-14 -2.8100E-12
  1.4848E-13  2.2732E-13  1.8093E-14 -8.0150E-14  2.7983E-13  4.8373E-12
  1.1027E-12  7.2469E-12  6.7590E-13 -2.8100E-12  4.8373E-12  1.6853E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    2.635127 -153.255966    0.810948    0.025906   -0.560021  2457074.139828
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          356.27797 +/-     0.103
Argument of Peri:      174.07273 +/-     0.145
Long of Asc Node:       36.19273 +/-     0.000
Inclination:            13.50029 +/-     0.001
Eccentricity:         0.16395980 +/-    0.0000
Semi-Major Axis:     39.54700556 +/-    0.0025
Time of Perihelion: 2458009.6754 +/-      26.0
Perihelion:          33.06288652 +/-    0.0029
Aphelion:            46.03112461 +/-    0.0036
Period (y)              248.7016 +/-      0.02
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -29.86977514 +/-    0.0005
Ecliptic Y          -14.14217075 +/-    0.0002
Ecliptic Z            1.49451613 +/-    0.0000
Ecliptic XDOT         0.00135081 +/-    0.0000
Ecliptic YDOT        -0.00283437 +/-    0.0000
Ecliptic ZDOT        -0.00074068 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   33.08229192 +/-    0.0005
Geocenter to KBO     32.50983678 +/-    0.0006
# Hcoef:  8.97

The following table shows the complete astrometric record for 15GX54. 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 (15GX54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  20.63905  13 43 05.430  -07 51 10.59  24.1r 15GX54    568  C~2lV9      
2015 03  18.58338  13 41 26.372  -07 42 20.55  24.0r 15GX54    568  C~2lV9      
2015 03  18.63265  13 41 26.132  -07 42 19.40  23.9r 15GX54    568  C~2lV9      
2015 04  11.52247  13 39 17.741  -07 31 24.28  23.9r 15GX54    568  C~2lV9      
2015 04  13.38609  13 39 07.066  -07 30 31.25  24.1r 15GX54    568  C~2lV9      
2015 04  13.44737  13 39 06.696  -07 30 29.56  24.1r 15GX54    568  C~2lV9      
2015 04  13.45145  13 39 06.677  -07 30 29.32  24.0r 15GX54    568  C~2lV9      
2015 04  13.45555  13 39 06.654  -07 30 29.33  24.3r 15GX54    568  C~2lV9      
2015 04  13.52960  13 39 06.225  -07 30 27.19  24.1r 15GX54    568  C~2lV9      
2015 05  18.34948  13 35 56.483  -07 15 49.61  24.8r 15GX54    568  C~2lV9      
2015 06  20.29948  13 34 02.916  -07 09 36.05  24.3r 15GX54    568  C~2lV9      
2015 06  20.34029  13 34 02.828  -07 09 35.96  24.6r 15GX54    568  C~2lV9      
2015 07  14.29673  13 33 47.466  -07 11 57.30  24.6r 15GX54    568  C~2lV9      
2015 07  20.28959  13 33 53.485  -07 13 30.85  24.4r 15GX54    568  C~2lV9      
2016 02  04.62240  13 50 27.773  -09 03 19.32  24.1w 15GX54    568  C~2lV9      
2016 02  11.60562  13 50 20.496  -09 02 44.67  24.3w 15GX54    568  C~2lV9      
2016 03  11.61299  13 48 54.935  -08 55 31.89  24.3w 15GX54    568  C~2lV9      
2016 04  03.48172  13 47 00.597  -08 46 01.12  24.4w 15GX54    568  C~2lV9      
2016 04  09.46287  13 46 26.905  -08 43 16.31  24.0w 15GX54    568  C~2lV9      
2016 05  02.35180  13 44 15.808  -08 32 55.69  24.1w 15GX54    568  C~2lV9      
2016 05  07.35515  13 43 48.370  -08 30 51.56  24.1w 15GX54    568  C~2lV9      
2016 05  29.33555  13 42 02.952  -08 23 28.65  24.4w 15GX54    568  C~2lV9      
2016 06  04.39796  13 41 39.783  -08 22 04.30  24.2w 15GX54    568  C~2lV9      
2016 06  27.32960  13 40 42.959  -08 19 52.85  24.5w 15GX54    568  C~2lV9      
2016 07  07.31994  13 40 35.231  -08 20 36.10  24.6w 15GX54    568  C~2lV9      
2017 03  30.52059  13 54 28.185  -09 58 33.48        15GX54    568  C~2lV9      
2017 03  31.45585  13 54 23.180  -09 58 09.45  24.1w 15GX54    568  C~2lV9      
2017 06  25.28243  13 47 41.926  -09 29 50.12  24.3w 15GX54    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    -0.03       0.00     0.06
     2   0.0710  -1564.37    -0.04     -33.89    -0.03
     3   0.0712  -1568.11     0.02     -34.10    -0.11
     4   0.1366  -3585.17     0.16    -110.28    -0.04
     5   0.1417  -3752.42     0.10    -118.09     0.06
     6   0.1418  -3758.16    -0.04    -118.49    -0.04
     7   0.1419  -3758.51    -0.02    -118.37     0.10
     8   0.1419  -3758.83     0.04    -118.51    -0.01
     9   0.1421  -3765.55     0.09    -118.81     0.04
    10   0.2374  -6716.37    -0.19    -321.32    -0.05
    11   0.3276  -8429.08     0.01    -586.80    -0.04
    12   0.3277  -8430.33    -0.07    -587.19    -0.05
    13   0.3933  -8592.24     0.03    -802.16     0.20
    14   0.4097  -8474.59    -0.02    -856.78    -0.09
    15   0.9555   7678.49    -0.10   -1706.01    -0.05
    16   0.9746   7565.25    -0.02   -1711.78    -0.02
    17   1.0540   6224.96     0.11   -1756.59     0.01
    18   1.1166   4436.83    -0.07   -1825.78     0.07
    19   1.1330   3911.16    -0.02   -1849.80     0.06
    20   1.1957   1873.08    -0.08   -1964.61     0.00
    21   1.2094   1448.56     0.06   -1994.42    -0.05
    22   1.2695   -170.43    -0.02   -2141.99     0.04
    23   1.2861   -521.62     0.02   -2186.81     0.12
    24   1.3489  -1355.86     0.09   -2367.53    -0.14
    25   1.3763  -1447.31    -0.03   -2449.19    -0.04
    26   2.1051  12187.13    -0.02   -3556.22    -0.05
    27   2.1076  12109.18     0.02   -3559.67     0.05
    28   2.3426   5946.31     0.03   -4066.08     0.00

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.

15GX54    quality flag:3

Type:           3:2E      3:2E      3:2E

axisobj        39.170    39.180    39.161
ecceobj         0.156     0.156     0.156
incobj         13.539    13.540    13.539
qmin           32.416    32.461    32.401
qmax           47.061    46.985    47.244
amean          39.456    39.457    39.457
amin           39.016    39.002    39.004
amax           39.967    39.960    39.977
emean           0.160     0.159     0.160
emin            0.137     0.138     0.139
emax            0.179     0.176     0.182
imean          12.994    13.006    12.966
imin           12.490    12.504    12.465
imax           13.544    13.547    13.495
excite_mean     0.276     0.276     0.276
fracstop        1.000     1.000     1.000
cjmean          2.965     2.965     2.965

libcent 0       179.6     179.1     180.8
libamp  0        96.5      95.9      98.2
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       179.7     180.2     178.6
kozaiamp        180.0     179.9     180.0