Orbit Fit and Astrometric record for 15GL54

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: 15GL54    
# Created Thu Dec  9 02:13:12 2021
# Orbit generated from Bernstein formalism
# Fitting     35 observations of     35
# Arc:   2.11y
# First observation: 2015/02/17
#  Last observation: 2017/03/29
Preliminary a, adot, b, bdot, g, gdot:
  -0.000136   0.032032   0.000001   0.000051   0.028910   0.000000
# Chi-squared of fit:     5.31 DOF:     64 RMS:  0.07
# Min/Max residuals:    -0.17    0.19
# Exact a, adot, b, bdot, g, gdot:
  1.707567E-05  3.152241E-02  1.072421E-07  4.933782E-05  2.881659E-02 -6.132901E-03
# Covariance matrix:
  1.7130E-13 -1.5721E-14 -5.0864E-16  3.3022E-16  1.2154E-13  1.1773E-12
 -1.5721E-14  3.6074E-13 -9.7079E-16  1.5917E-15  1.7271E-13  6.3688E-12
 -5.0864E-16 -9.7079E-16  8.2312E-14 -6.4216E-14 -1.0104E-15 -2.3714E-14
  3.3022E-16  1.5917E-15 -6.4216E-14  1.0043E-13  1.0937E-15  3.8937E-14
  1.2154E-13  1.7271E-13 -1.0104E-15  1.0937E-15  2.1446E-13  4.2155E-12
  1.1773E-12  6.3688E-12 -2.3714E-14  3.8937E-14  4.2155E-12  1.5582E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.261988 -155.511561    0.819318    0.012200   -0.547143  2457071.006958
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          309.87529 +/-     0.016
Argument of Peri:      159.82537 +/-     0.041
Long of Asc Node:      118.42259 +/-     0.026
Inclination:             1.24723 +/-     0.000
Eccentricity:         0.23797132 +/-    0.0004
Semi-Major Axis:     39.66654689 +/-    0.0082
Time of Perihelion: 2469775.7833 +/-       1.2
Perihelion:          30.22704640 +/-    0.0173
Aphelion:            49.10604739 +/-    0.0190
Period (y)              249.8301 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.41336689 +/-    0.0005
Ecliptic Y          -13.86209497 +/-    0.0002
Ecliptic Z            0.76428214 +/-    0.0000
Ecliptic XDOT         0.00176801 +/-    0.0000
Ecliptic YDOT        -0.00248958 +/-    0.0000
Ecliptic ZDOT        -0.00000805 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.26142591 +/-    0.0005
Geocenter to KBO     34.70222851 +/-    0.0006
# Hcoef:  8.49

The following table shows the complete astrometric record for 15GL54. 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 (15GL54) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.50618  13 32 35.513  -08 18 58.28  24.3r 15GL54    568  C~2lV7      
2015 02  17.54752  13 32 35.410  -08 18 57.60  24.2r 15GL54    568  C~2lV7      
2015 02  20.47836  13 32 28.005  -08 18 08.38  24.1r 15GL54    568  C~2lV7      
2015 03  18.47955  13 30 51.244  -08 08 00.23  23.9r 15GL54    568  C~2lV7      
2015 03  18.48429  13 30 51.199  -08 08 00.13  23.8r 15GL54    568  C~2lV7      
2015 03  18.52590  13 30 51.013  -08 07 58.99  24.0r 15GL54    568  C~2lV7      
2015 03  20.52796  13 30 41.669  -08 07 01.96  24.0r 15GL54    568  C~2lV7      
2015 04  11.41852  13 28 50.000  -07 55 51.82  24.0r 15GL54    568  C~2lV7      
2015 04  12.37119  13 28 44.919  -07 55 21.59  23.8r 15GL54    568  C~2lV7      
2015 04  12.42087  13 28 44.647  -07 55 19.93  23.9r 15GL54    568  C~2lV7      
2015 04  12.45912  13 28 44.424  -07 55 18.91  23.8r 15GL54    568  C~2lV7      
2015 04  14.46908  13 28 33.704  -07 54 15.34  24.1r 15GL54    568  C~2lV7      
2015 04  18.42971  13 28 12.570  -07 52 11.15  23.7r 15GL54    568  C~2lV7      
2015 05  16.26602  13 25 54.520  -07 38 54.50  23.8r 15GL54    568  C~2lV7      
2015 05  25.37165  13 25 17.477  -07 35 27.49  24.2r 15GL54    568  C~2lV7      
2015 05  25.41355  13 25 17.313  -07 35 26.65  23.6r 15GL54    568  C~2lV7      
2015 05  25.42921  13 25 17.250  -07 35 26.25  23.8r 15GL54    568  C~2lV7      
2015 06  21.32182  13 24 06.433  -07 29 15.96  23.9r 15GL54    568  C~2lV7      
2015 06  22.27832  13 24 05.147  -07 29 10.34  23.4r 15GL54    568  C~2lV7      
2015 07  12.27234  13 23 59.407  -07 29 20.92  23.9r 15GL54    568  C~2lV7      
2015 07  15.26255  13 24 02.102  -07 29 43.56  23.9r 15GL54    568  C~2lV7      
2015 07  19.26227  13 24 07.162  -07 30 23.00  24.2r 15GL54    568  C~2lV7      
2016 02  04.59812  13 39 47.770  -09 00 58.89  24.3w 15GL54    568  C~2lV7      
2016 02  10.61712  13 39 40.736  -09 00 04.88  24.3w 15GL54    568  C~2lV7      
2016 03  11.56702  13 38 13.379  -08 50 46.21  24.0w 15GL54    568  C~2lV7      
2016 04  03.45744  13 36 23.976  -08 39 51.46  24.1w 15GL54    568  C~2lV7      
2016 04  09.43859  13 35 52.269  -08 36 45.47  24.2w 15GL54    568  C~2lV7      
2016 05  06.32911  13 33 30.599  -08 23 10.37  24.2w 15GL54    568  C~2lV7      
2016 05  28.30028  13 31 54.756  -08 14 18.73  24.1w 15GL54    568  C~2lV7      
2016 06  04.37773  13 31 30.878  -08 12 11.30  23.9w 15GL54    568  C~2lV7      
2016 06  27.33366  13 30 44.316  -08 08 25.70  24.4w 15GL54    568  C~2lV7      
2016 07  07.32400  13 30 40.357  -08 08 25.20  24.1w 15GL54    568  C~2lV7      
2017 02  24.65166  13 46 08.011  -09 36 10.83        15GL54    568  C~2lV7      
2017 03  29.48748  13 43 54.141  -09 22 46.34  24.0w 15GL54    568  C~2lV7      
2017 03  29.50900  13 43 54.038  -09 22 45.71  23.8w 15GL54    568  C~2lV7      

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     0.05       0.00    -0.02
     2   0.0001     -1.67     0.03       0.07     0.00
     3   0.0081   -121.97    -0.07       5.67    -0.01
     4   0.0793  -1681.44     0.15      45.21     0.10
     5   0.0793  -1682.10    -0.15      45.06    -0.05
     6   0.0795  -1685.09     0.01      45.11    -0.03
     7   0.0849  -1835.10    -0.04      47.25    -0.02
     8   0.1449  -3624.27     0.15      61.01    -0.08
     9   0.1475  -3705.61     0.03      61.34     0.05
    10   0.1476  -3709.98    -0.03      61.39     0.12
    11   0.1477  -3713.44    -0.17      61.12    -0.13
    12   0.1532  -3884.98    -0.03      61.60     0.11
    13   0.1641  -4222.79     0.07      61.43    -0.09
    14   0.2403  -6425.23    -0.04      44.80    -0.05
    15   0.2652  -7014.11    -0.02      33.48     0.03
    16   0.2653  -7016.69    -0.04      33.36    -0.02
    17   0.2654  -7017.71    -0.11      33.39     0.04
    18   0.3390  -8134.55     0.00     -12.58    -0.01
    19   0.3416  -8154.43     0.04     -14.45    -0.02
    20   0.3963  -8229.91     0.13     -55.95    -0.00
    21   0.4045  -8184.22     0.03     -62.12     0.19
    22   0.4155  -8099.58     0.04     -70.87    -0.05
    23   0.9640   6890.12     0.04     -17.00     0.03
    24   0.9805   6773.31    -0.02      -4.30    -0.03
    25   1.0625   5363.15     0.04      47.94    -0.13
    26   1.1251   3613.34     0.03      69.28     0.00
    27   1.1415   3107.56    -0.03      71.51     0.01
    28   1.2151    853.10     0.04      64.22     0.08
    29   1.2753   -665.33     0.03      38.70     0.01
    30   1.2947  -1041.86    -0.09      27.40     0.03
    31   1.3575  -1767.80     0.03     -16.23    -0.03
    32   1.3849  -1822.68    -0.06     -37.33    -0.07
    33   2.0209  12915.82     0.00      34.90     0.05
    34   2.1108  10771.45    -0.06      77.05    -0.02
    35   2.1109  10769.80     0.05      77.09     0.02

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.

15GL54    quality flag:3

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

axisobj        39.311    39.328    39.294
ecceobj         0.237     0.238     0.236
incobj          1.248     1.248     1.248
qmin           29.387    29.373    29.415
qmax           50.228    50.310    50.205
amean          39.456    39.456    39.456
amin           38.950    38.917    38.959
amax           40.048    40.058    40.036
emean           0.240     0.240     0.239
emin            0.223     0.225     0.223
emax            0.256     0.257     0.255
imean           0.774     0.744     0.663
imin            0.295     0.191     0.200
imax            1.278     1.103     1.036
excite_mean     0.240     0.241     0.239
fracstop        1.000     1.000     1.000
cjmean          2.985     2.985     2.986

libcent 0       180.1     179.6     180.0
libamp  0       106.5     119.9     103.4
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       154.5     154.3     159.1
kozaiamp        179.9     180.0     180.0