Orbit Fit and Astrometric record for 18HM14

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: 18HM14    
# Created Tue Apr  1 01:11:09 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     17 observations of     17
# Arc:   5.10y
# First observation: 2014/02/28
#  Last observation: 2019/04/04
# Chi-squared of fit:     8.23 DOF:     28 RMS:  0.12
# Min/Max residuals:    -0.30    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.433295E-05  2.014413E-02 -2.880034E-07 -5.245617E-04  2.221526E-02  7.850356E-04
# Covariance matrix:
  4.7934E-13 -2.8963E-13 -1.3607E-15  4.7805E-15 -2.2445E-13 -1.9731E-12
 -2.8963E-13  9.9480E-13  6.6695E-15 -2.3692E-14  1.4448E-12  9.8844E-12
 -1.3607E-15  6.6695E-15  4.3545E-13 -1.0236E-13  9.5017E-15  6.8784E-14
  4.7805E-15 -2.3692E-14 -1.0236E-13  3.0534E-14 -3.4149E-14 -2.4397E-13
 -2.2445E-13  1.4448E-12  9.5017E-15 -3.4149E-14  2.5835E-12  1.4406E-11
 -1.9731E-12  9.8844E-12  6.8784E-14 -2.4397E-13  1.4406E-11  1.0163E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.824407  173.133064    0.231874    0.030709   -0.960610  2456716.863734
# Heliocentric elements and errors
Epoch:              2456716.5000  =  2014/02/28
Mean Anomaly:          134.00311 +/-     0.331
Argument of Peri:      351.53485 +/-     0.334
Long of Asc Node:       43.19713 +/-     0.009
Inclination:             2.31914 +/-     0.000
Eccentricity:         0.05181209 +/-    0.0004
Semi-Major Axis:     44.32317155 +/-    0.0073
Time of Perihelion: 2416596.8581 +/-      99.5
Perihelion:          42.02669543 +/-    0.0185
Aphelion:            46.61964768 +/-    0.0188
Period (y)              295.0900 +/-      0.07
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -45.59644094 +/-    0.0032
Ecliptic Y            5.72594193 +/-    0.0004
Ecliptic Z            1.43307045 +/-    0.0001
Ecliptic XDOT        -0.00040064 +/-    0.0000
Ecliptic YDOT        -0.00245595 +/-    0.0000
Ecliptic ZDOT        -0.00006140 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.97687890 +/-    0.0032
Geocenter to KBO     45.01411348 +/-    0.0033
# Hcoef:  7.53

The following table shows the complete astrometric record for 18HM14. 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 (18HM14) followed by the observatory code and reference code for the source of the astrometry.

2014 02  28.362956 11 37 40.39   +04 24 05.4         18HM14    T09  C~8MgL      
2014 02  28.375841 11 37 40.34   +04 24 05.7         18HM14    T09  C~8MgL      
2014 02  28.395883 11 37 40.25   +04 24 06.3         18HM14    T09  C~8MgL      
2016 03  17.569014 11 44 52.12   +03 33 33.5         18HM14    T09  C~8MgL      
2018 03  10.505008 11 53 46.13   +02 31 39.5         18HM14    T09  C~8MgL      
2018 03  18.46645  11 53 13.19   +02 35 12.3   24.1i 18HM14    T09  C~8MgL      
2018 03  18.49491  11 53 13.09   +02 35 13.1   24.2i 18HM14    T09  C~8MgM      
2018 03  18.56803  11 53 12.78   +02 35 15.1   24.1i 18HM14    T09  C~8MgM      
2018 04  12.118960 11 51 34.315  +02 45 33.73  23.9V 18HM14    W84  C~8MgM      
2018 04  24.36214  11 50 51.73   +02 49 50.6   24.2z 18HM14    T09  C~8MgM      
2018 04  24.39066  11 50 51.64   +02 49 50.7   23.5z 18HM14    T09  C~8MgM      
2018 04  24.43452  11 50 51.50   +02 49 51.6   23.9z 18HM14    T09  C~8MgM      
2018 04  24.47734  11 50 51.37   +02 49 52.8   24.2z 18HM14    T09  C~8MgM      
2018 04  24.49071  11 50 51.31   +02 49 53.1   23.6z 18HM14    T09  C~8MgM      
2019 02  05.500779 11 59 54.61   +01 49 10.1         18HM14    T09  C~8MgM      
2019 02  05.662517 11 59 54.15   +01 49 13.2         18HM14    T09  C~8MgM      
2019 04  04.436418 11 56 14.93   +02 13 11.9         18HM14    T09  C~8MgM      

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    -0.02
     2   0.0000      0.00     0.03       0.00    -0.06
     3   0.0001      0.00    -0.09       0.00     0.01
     4   2.0485      0.00     0.09       0.00     0.09
     5   4.0278      0.00     0.17       0.00    -0.15
     6   4.0496      0.00    -0.30       0.00    -0.04
     7   4.0496      0.00     0.00       0.00    -0.00
     8   4.0498      0.00    -0.02       0.00     0.05
     9   4.1171      0.00    -0.13       0.00     0.04
    10   4.1506      0.00    -0.03       0.00     0.19
    11   4.1507      0.00     0.02       0.00    -0.25
    12   4.1508      0.00     0.07       0.00    -0.18
    13   4.1509      0.00     0.20       0.00     0.21
    14   4.1509      0.00    -0.05       0.00     0.26
    15   4.9367      0.00    -0.03       0.00     0.03
    16   4.9372      0.00     0.03       0.00    -0.03
    17   5.0953      0.00    -0.02       0.00    -0.11

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.

18HM14    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.043    44.043    44.043
ecceobj         0.057     0.057     0.057
incobj          2.322     2.322     2.322
qmin           40.750    40.752    40.749
qmax           47.865    47.870    47.872
amean          44.199    44.199    44.199
amin           43.854    43.857    43.849
amax           44.569    44.569    44.568
emean           0.059     0.059     0.059
emin            0.043     0.043     0.043
emax            0.075     0.075     0.075
imean           1.655     1.655     1.655
imin            0.908     0.908     0.908
imax            2.227     2.227     2.227
excite_mean     0.066     0.066     0.066
fracstop        1.000     1.000     1.000
cjmean          3.099     3.099     3.099

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       181.3     181.3     181.2
kozaiamp        180.0     180.0     180.0