Orbit Fit and Astrometric record for 12HL85

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: 12HL85    
# Created Sat Oct 20 01:09:06 2018
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting   37 observations of   37
# Arc:  16.10y
# First observation: 1999/03/21
#  Last observation: 2015/04/26
# Chi-squared of fit:    24.35 DOF:   68 RMS:  0.14
# Min/Max residuals:    -0.39    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.568375E-05  2.328797E-02 -3.110264E-06 -6.037400E-03  2.480336E-02  1.230276E-05
# Covariance matrix:
  2.1385E-13 -2.6502E-14 -5.8053E-15  4.1974E-15  6.8499E-14 -4.2095E-14
 -2.6502E-14  3.4264E-14  1.2028E-14 -8.5541E-15  8.2685E-14  8.6646E-14
 -5.8053E-15  1.2028E-14  1.6665E-13 -1.4963E-14  2.8865E-14  3.1485E-14
  4.1974E-15 -8.5541E-15 -1.4963E-14  3.3301E-15 -2.0368E-14 -2.2397E-14
  6.8499E-14  8.2685E-14  2.8865E-14 -2.0368E-14  4.5092E-13  2.0729E-13
 -4.2095E-14  8.6646E-14  3.1485E-14 -2.2397E-14  2.0729E-13  2.2683E-13
#      lat0       lon0       xBary       yBary       zBary        JD0
    8.329918 -160.635159    0.327695    0.137286   -0.939365  2451258.855900
# Heliocentric elements and errors
Epoch:              2451258.5000  =  1999/03/21
Mean Anomaly:          196.10092 +/-     0.082
Argument of Peri:      314.93917 +/-     0.076
Long of Asc Node:       47.58234 +/-     0.000
Inclination:            16.59962 +/-     0.000
Eccentricity:         0.02438839 +/-    0.0001
Semi-Major Axis:     40.30398208 +/-    0.0038
Time of Perihelion: 2493807.9927 +/-      22.4
Perihelion:          39.32103301 +/-    0.0045
Aphelion:            41.28693115 +/-    0.0047
Period (y)              255.8763 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.63084429 +/-    0.0010
Ecliptic Y          -13.23322281 +/-    0.0004
Ecliptic Z            5.84076242 +/-    0.0002
Ecliptic XDOT         0.00075785 +/-    0.0000
Ecliptic YDOT        -0.00244874 +/-    0.0000
Ecliptic ZDOT        -0.00065918 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.25015342 +/-    0.0010
Geocenter to KBO     40.31714868 +/-    0.0011
# Hcoef:  6.43

The following table shows the complete astrometric record for 12HL85. 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 (12HL85) followed by the observatory code and reference code for the source of the astrometry.

1999 03  21.355157 13 24 04.00   +00 08 17.9   22.4V 12HL85    645  C~2VVJ      
1999 03  21.355986 13 24 04.01   +00 08 18.0   22.1V 12HL85    645  C~2VVJ      
1999 03  21.358474 13 24 04.00   +00 08 18.4   23.2V 12HL85    645  C~2VVJ      
2000 04  06.340535 13 27 13.26   -00 33 31.5   22.5V 12HL85    645  C~2VVJ      
2000 04  06.341364 13 27 13.26   -00 33 31.6   22.2V 12HL85    645  C~2VVJ      
2000 04  06.343852 13 27 13.26   -00 33 31.5   23.5V 12HL85    645  C~2VVJ      
2000 04  25.252105 13 25 44.64   -00 26 08.6   22.4V 12HL85    645  C~2VVJ      
2000 04  25.252934 13 25 44.64   -00 26 08.5   22.0V 12HL85    645  C~2VVJ      
2000 04  25.255422 13 25 44.64   -00 26 08.5   23.8V 12HL85    645  C~2VVJ      
2006 05  25.199169 13 50 19.36   -05 13 10.4   22.3V 12HL85    645  C~2VVJ      
2006 05  25.199998 13 50 19.35   -05 13 10.5   21.7V 12HL85    645  C~2VVJ      
2006 05  25.202486 13 50 19.36   -05 13 10.4   23.7V 12HL85    645  C~2VVJ      
2011 04  27.38629  14 15 01.161  -09 24 56.54  22.7w 12HL85    F51  C~1w3q      
2011 04  27.43036  14 15 00.938  -09 24 55.71  22.3w 12HL85    F51  C~1w3q      
2012 04  27.43132  14 19 32.237  -10 12 50.16  22.7w 12HL85    F51  C~1w3q      
2012 04  27.44629  14 19 32.165  -10 12 49.88  22.9w 12HL85    F51  C~1w3q      
2012 04  27.46128  14 19 32.082  -10 12 49.24  22.5w 12HL85    F51  C~1w3q      
2012 04  27.47627  14 19 32.016  -10 12 49.28  22.4w 12HL85    F51  C~1w3q      
2012 05  21.35214  14 17 39.796  -10 05 19.35  22.5w 12HL85    F51  C~1w3q      
2012 05  21.36665  14 17 39.739  -10 05 19.16  23.0w 12HL85    F51  C~1w3q      
2012 05  21.38115  14 17 39.674  -10 05 19.12  22.8w 12HL85    F51  C~1w3q      
2012 05  21.39568  14 17 39.604  -10 05 18.76  22.6w 12HL85    F51  C~1w3q      
2013 01  17.62987  14 27 59.693  -11 19 00.84  22.8w 12HL85    F51  C~1w3q      
2013 01  17.63527  14 27 59.700  -11 19 00.97  22.7w 12HL85    F51  C~1w3q      
2013 05  09.40174  14 23 11.944  -10 56 55.57  22.3w 12HL85    F51  C~1w3q      
2013 05  09.41572  14 23 11.889  -10 56 55.63  22.7w 12HL85    F51  C~1w3q      
2013 05  09.42969  14 23 11.825  -10 56 55.09  22.4w 12HL85    F51  C~1w3q      
2013 05  09.44367  14 23 11.740  -10 56 54.77  22.3w 12HL85    F51  C~1w3q      
2014 03  27.54407  14 31 10.520  -11 58 48.49  22.4w 12HL85    F51  C~1w3q      
2014 04  05.52518  14 30 33.039  -11 56 02.90  22.6w 12HL85    F51  C~1w3q      
2014 04  05.53575  14 30 32.980  -11 56 02.29  22.7w 12HL85    F51  C~1w3q      
2014 04  05.55687  14 30 32.894  -11 56 02.23  22.6w 12HL85    F51  C~1w3q      
2014 04  23.41183  14 29 09.524  -11 50 05.61  22.6w 12HL85    F51  C~1w3q      
2015 04  25.29654  14 33 42.30   -12 37 03.1   22.8V 12HL85    W84  C~2fc3      
2015 04  25.36555  14 33 41.96   -12 37 01.8         12HL85    W84  C~2fc3      
2015 04  26.29237  14 33 37.43   -12 36 43.2         12HL85    W84  C~2fc3      
2015 04  26.36217  14 33 37.07   -12 36 41.8         12HL85    W84  C~2fc3      

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    -0.17       0.00    -0.10
  2   0.0000      0.00     0.04       0.00    -0.02
  3   0.0000      0.00     0.05       0.00     0.31
  4   1.0458      0.00     0.01       0.00     0.15
  5   1.0458      0.00     0.07       0.00     0.03
  6   1.0458      0.00     0.25       0.00     0.07
  7   1.0976      0.00    -0.02       0.00    -0.31
  8   1.0976      0.00     0.04       0.00    -0.23
  9   1.0976      0.00     0.21       0.00    -0.28
 10   7.1782      0.00     0.03       0.00     0.06
 11   7.1782      0.00    -0.07       0.00    -0.05
 12   7.1782      0.00     0.23       0.00     0.02
 13  12.1014      0.00    -0.01       0.00     0.12
 14  12.1015      0.00    -0.09       0.00     0.02
 15  13.1036      0.00     0.13       0.00     0.02
 16  13.1036      0.00     0.16       0.00    -0.01
 17  13.1036      0.00     0.03       0.00     0.32
 18  13.1037      0.00     0.16       0.00    -0.03
 19  13.1691      0.00    -0.06       0.00     0.12
 20  13.1691      0.00     0.06       0.00     0.08
 21  13.1691      0.00     0.05       0.00    -0.12
 22  13.1692      0.00    -0.03       0.00     0.01
 23  13.8296      0.00     0.23       0.00     0.23
 24  13.8297      0.00     0.19       0.00     0.15
 25  14.1357      0.00     0.02       0.00    -0.06
 26  14.1357      0.00     0.21       0.00    -0.39
 27  14.1357      0.00     0.28       0.00    -0.11
 28  14.1358      0.00     0.02       0.00    -0.06
 29  15.0176      0.00     0.07       0.00    -0.19
 30  15.0422      0.00     0.06       0.00    -0.15
 31  15.0422      0.00    -0.12       0.00     0.25
 32  15.0423      0.00     0.01       0.00    -0.09
 33  15.0912      0.00     0.06       0.00     0.03
 34  16.0957      0.00    -0.04       0.00    -0.14
 35  16.0959      0.00    -0.02       0.00    -0.22
 36  16.0984      0.00     0.07       0.00    -0.01
 37  16.0986      0.00    -0.14       0.00    -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.

12HL85    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        40.315    40.315    40.315
ecceobj         0.024     0.024     0.024
incobj         16.606    16.606    16.606
qmin           39.051    39.052    39.049
qmax           42.263    42.265    42.261
amean          40.578    40.578    40.578
amin           40.274    40.274    40.274
amax           40.883    40.883    40.883
emean           0.019     0.019     0.019
emin            0.003     0.003     0.003
emax            0.035     0.035     0.035
imean          14.773    14.773    14.773
imin           13.878    13.878    13.878
imax           15.875    15.875    15.875
excite_mean     0.256     0.256     0.256
fracstop        1.000     1.000     1.000
cjmean          2.987     2.987     2.987

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       176.6     176.6     176.5
kozaiamp        179.9     180.0     180.0