Orbit Fit and Astrometric record for 14XA48

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: 14XA48    
# Created Fri Dec  3 02:12:56 2021
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     42 observations of     42
# Arc:   5.86y
# First observation: 2014/12/12
#  Last observation: 2020/10/20
# Chi-squared of fit:    17.84 DOF:     78 RMS:  0.12
# Min/Max residuals:    -0.22    0.49
# Exact a, adot, b, bdot, g, gdot:
  1.586772E-05  2.454603E-02  2.407253E-06  4.005320E-03  2.438128E-02  3.758622E-03
# Covariance matrix:
  1.7935E-13 -1.1614E-13  3.6556E-15 -1.2562E-14 -7.1214E-14 -6.4870E-13
 -1.1614E-13  1.4703E-13 -1.3358E-14  1.6533E-14  1.2117E-14  9.6810E-13
  3.6556E-15 -1.3358E-14  8.3659E-14 -2.8640E-14  7.8490E-15 -9.9675E-14
 -1.2562E-14  1.6533E-14 -2.8640E-14  1.7936E-14  3.7951E-15  1.2169E-13
 -7.1214E-14  1.2117E-14  7.8490E-15  3.7951E-15  1.0701E-13  7.6224E-14
 -6.4870E-13  9.6810E-13 -9.9675E-14  1.2169E-13  7.6224E-14  7.1437E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
  -25.059321   13.893189   -0.897408   -0.170966   -0.366118  2457003.660428
# Heliocentric elements and errors
Epoch:              2457004.5000  =  2014/12/13
Mean Anomaly:           46.77012 +/-     0.009
Argument of Peri:      223.46220 +/-     0.013
Long of Asc Node:       82.87338 +/-     0.001
Inclination:            26.57176 +/-     0.000
Eccentricity:         0.20253554 +/-    0.0001
Semi-Major Axis:     46.60780276 +/-    0.0044
Time of Perihelion: 2441905.3551 +/-       3.7
Perihelion:          37.16806616 +/-    0.0066
Aphelion:            56.04753937 +/-    0.0077
Period (y)              318.1970 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           36.24126268 +/-    0.0005
Ecliptic Y            9.89099799 +/-    0.0001
Ecliptic Z          -17.37217169 +/-    0.0002
Ecliptic XDOT        -0.00010985 +/-    0.0000
Ecliptic YDOT         0.00280814 +/-    0.0000
Ecliptic ZDOT         0.00022876 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.38893514 +/-    0.0004
Geocenter to KBO     41.01502238 +/-    0.0006
# Hcoef:  7.06

The following table shows the complete astrometric record for 14XA48. 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 (14XA48) followed by the observatory code and reference code for the source of the astrometry.

2014 12  12.15965  01 30 50.601  -17 34 58.26  23.2i 14XA48    W84  C~4yVS      
2014 12  12.15965  01 30 50.60   -17 34 58.3   23.2i 14XA48    W84  C~3cpY      
2014 12  17.15251  01 30 39.667  -17 32 46.27  23.2r 14XA48    W84  C~4yVS      
2014 12  17.15251  01 30 39.67   -17 32 46.3   23.4r 14XA48    W84  C~3cpY      
2015 01  12.07718  01 30 19.997  -17 16 40.28  23.3r 14XA48    W84  C~4yVS      
2015 01  12.07718  01 30 20.00   -17 16 40.3   23.3r 14XA48    W84  C~3cpY      
2015 08  18.34592  01 43 22.036  -16 13 33.89  23.6r 14XA48    W84  C~4yVS      
2015 08  18.34728  01 43 22.036  -16 13 34.18  23.4g 14XA48    W84  C~4yVS      
2015 08  19.42115  01 43 20.062  -16 14 16.06  23.1i 14XA48    W84  C~4yVS      
2015 08  23.40206  01 43 11.921  -16 16 53.79  23.3r 14XA48    W84  C~4yVS      
2015 08  24.40244  01 43 09.676  -16 17 33.45  22.9r 14XA48    W84  C~4yVS      
2015 10  22.23461  01 39 14.282  -16 49 56.40  23.1i 14XA48    W84  C~4yVS      
2015 11  05.18590  01 38 07.403  -16 53 03.06  23.4i 14XA48    W84  C~4yVS      
2015 11  05.18590  01 38 07.40   -16 53 03.1   23.4i 14XA48    W84  C~3cpY      
2015 11  07.13748  01 37 58.374  -16 53 16.93  23.0i 14XA48    W84  C~4yVS      
2015 11  07.13748  01 37 58.37   -16 53 16.9   23.1i 14XA48    W84  C~3cpY      
2015 11  21.11674  01 36 58.015  -16 53 23.48  22.9z 14XA48    W84  C~4yVS      
2015 12  01.12603  01 36 21.163  -16 51 46.06  23.1r 14XA48    W84  C~4yVS      
2015 12  01.12603  01 36 21.16   -16 51 46.1   23.2r 14XA48    W84  C~3cpY      
2015 12  01.12740  01 36 21.179  -16 51 45.62  23.4i 14XA48    W84  C~4yVS      
2015 12  01.12878  01 36 21.163  -16 51 46.10  23.5g 14XA48    W84  C~4yVS      
2015 12  01.12878  01 36 21.16   -16 51 46.1   23.7g 14XA48    W84  C~3cpY      
2016 09  30.29974  01 45 48.914  -15 53 10.06  22.9i 14XA48    W84  C~4yVS      
2016 09  30.29974  01 45 48.91   -15 53 10.0   23.0i 14XA48    W84  C~3cpY      
2016 09  30.30111  01 45 48.921  -15 53 09.93  23.3r 14XA48    W84  C~4yVS      
2016 09  30.30111  01 45 48.92   -15 53 09.9   23.2r 14XA48    W84  C~3cpY      
2016 09  30.30247  01 45 48.899  -15 53 10.19  23.7g 14XA48    W84  C~4yVS      
2016 09  30.30247  01 45 48.90   -15 53 10.2   23.8g 14XA48    W84  C~3cpY      
2016 10  02.22228  01 45 40.243  -15 54 09.86  23.2r 14XA48    W84  C~4yVS      
2016 10  02.22228  01 45 40.25   -15 54 09.8   23.2r 14XA48    W84  C~3cpY      
2016 10  02.22364  01 45 40.241  -15 54 09.83  23.3i 14XA48    W84  C~4yVS      
2016 10  02.22364  01 45 40.24   -15 54 09.8   23.2i 14XA48    W84  C~3cpY      
2017 11  09.20111  01 47 30.419  -15 18 37.96  23.0z 14XA48    W84  C~4yVS      
2017 12  15.11022  01 45 19.628  -15 13 30.03  23.4g 14XA48    W84  C~4yVS      
2017 12  22.13027  01 45 04.644  -15 10 29.58  23.5i 14XA48    W84  C~4yVS      
2018 11  16.22913  01 51 45.140  -14 31 38.65  23.6i 14XA48    W84  C~4yVS      
2018 11  17.10192  01 51 41.372  -14 31 39.79  23.0i 14XA48    W84  C~4yVS      
2018 12  02.14266  01 50 42.480  -14 30 21.23  22.4r 14XA48    W84  C~4yVS      
2018 12  03.05923  01 50 39.319  -14 30 10.66  23.1r 14XA48    W84  C~4yVS      
2018 12  03.17738  01 50 38.911  -14 30 09.08  23.3g 14XA48    W84  C~4yVS      
2020 10  20.274270 02 03 05.791  -12 51 13.68  23.0G 14XA48    G37  C~4Ky0      
2020 10  20.327230 02 03 05.539  -12 51 14.77        14XA48    G37  C~4Ky0      

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     0.04
     2   0.0000      0.00    -0.02       0.00     0.00
     3   0.0137      0.00     0.04       0.00    -0.09
     4   0.0137      0.00    -0.00       0.00    -0.06
     5   0.0846      0.00     0.09       0.00     0.02
     6   0.0846      0.00     0.04       0.00     0.04
     7   0.6822      0.00     0.19       0.00     0.03
     8   0.6822      0.00     0.23       0.00    -0.20
     9   0.6852      0.00     0.16       0.00     0.11
    10   0.6961      0.00    -0.12       0.00    -0.13
    11   0.6988      0.00    -0.10       0.00    -0.03
    12   0.8599      0.00     0.09       0.00     0.16
    13   0.8981      0.00    -0.02       0.00    -0.18
    14   0.8981      0.00     0.02       0.00    -0.14
    15   0.9034      0.00    -0.02       0.00    -0.12
    16   0.9034      0.00    -0.08       0.00    -0.09
    17   0.9417      0.00    -0.16       0.00    -0.22
    18   0.9691      0.00    -0.12       0.00     0.03
    19   0.9691      0.00    -0.08       0.00     0.07
    20   0.9691      0.00     0.23       0.00     0.49
    21   0.9691      0.00     0.02       0.00    -0.01
    22   0.9691      0.00     0.06       0.00    -0.01
    23   1.8019      0.00    -0.19       0.00     0.04
    24   1.8019      0.00    -0.13       0.00    -0.02
    25   1.8019      0.00     0.05       0.00     0.18
    26   1.8019      0.00     0.07       0.00     0.15
    27   1.8019      0.00    -0.15       0.00    -0.07
    28   1.8019      0.00    -0.17       0.00    -0.06
    29   1.8072      0.00     0.09       0.00     0.09
    30   1.8072      0.00    -0.02       0.00     0.03
    31   1.8072      0.00     0.05       0.00     0.10
    32   1.8072      0.00     0.03       0.00     0.13
    33   2.9104      0.00    -0.06       0.00     0.02
    34   3.0088      0.00    -0.10       0.00    -0.02
    35   3.0280      0.00     0.12       0.00    -0.10
    36   3.9290      0.00     0.16       0.00     0.09
    37   3.9314      0.00    -0.08       0.00     0.03
    38   3.9726      0.00    -0.00       0.00     0.06
    39   3.9751      0.00    -0.01       0.00    -0.09
    40   3.9754      0.00     0.07       0.00     0.05
    41   5.8566      0.00     0.02       0.00    -0.13
    42   5.8567      0.00     0.06       0.00    -0.06

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.

14XA48    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        47.100    47.100    47.099
ecceobj         0.209     0.209     0.209
incobj         26.578    26.578    26.578
qmin           36.337    36.337    36.352
qmax           57.714    57.715    57.713
amean          46.814    46.815    46.815
amin           46.401    46.405    46.397
amax           47.287    47.293    47.299
emean           0.205     0.205     0.205
emin            0.189     0.189     0.189
emax            0.222     0.222     0.222
imean          25.055    25.055    25.055
imin           24.605    24.605    24.619
imax           25.491    25.491    25.494
excite_mean     0.470     0.470     0.470
fracstop        1.000     1.000     1.000
cjmean          2.855     2.855     2.855

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       186.8     186.9     186.7
kozaiamp        179.9     180.0     179.9