Orbit Fit and Astrometric record for 12BA155

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: 12BA155   
# Created Sat Oct 21 01:37:58 2017
# Orbit generated from Bernstein formalism
# Fitting   15 observations of   15
# Arc:   2.08y
# First observation: 2012/01/25
#  Last observation: 2014/02/24
Preliminary a, adot, b, bdot, g, gdot:
   0.000006   0.026712   0.000001   0.000682   0.025047   0.000000
# Chi-squared of fit:     7.84 DOF:   24 RMS:  0.13
# Min/Max residuals:    -0.28    0.34
# Exact a, adot, b, bdot, g, gdot:
  1.688943E-05  2.630815E-02  1.260287E-06  6.757707E-04  2.488890E-02 -7.383951E-03
# Covariance matrix:
  3.6932E-13  1.7211E-12  6.9593E-15  4.5427E-14  1.5115E-12  3.5682E-11
  1.7211E-12  3.2428E-11  1.0721E-13  8.0261E-13  2.3499E-11  6.3102E-10
  6.9593E-15  1.0721E-13  2.4861E-13 -1.1955E-13  8.7006E-14  2.0769E-12
  4.5427E-14  8.0261E-13 -1.1955E-13  1.1797E-13  5.7981E-13  1.5672E-11
  1.5115E-12  2.3499E-11  8.7006E-14  5.7981E-13  1.8921E-11  4.5550E-10
  3.5682E-11  6.3102E-10  2.0769E-12  1.5672E-11  4.5550E-10  1.2322E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
  -14.636817  144.788260    0.335869   -0.233988   -0.896048  2455951.914516
# Heliocentric elements and errors
Epoch:              2455950.5000  =  2012/01/24
Mean Anomaly:          328.71136 +/-     0.191
Argument of Peri:      340.47461 +/-     0.339
Long of Asc Node:      228.33850 +/-     0.006
Inclination:            14.38508 +/-     0.000
Eccentricity:         0.36777565 +/-    0.0045
Semi-Major Axis:     54.96610859 +/-    0.2190
Time of Perihelion: 2468887.2473 +/-      16.0
Perihelion:          34.75091224 +/-    0.2830
Aphelion:            75.18130495 +/-    0.3881
Period (y)              407.5217 +/-      2.44
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.32187386 +/-    0.0055
Ecliptic Y           23.22440468 +/-    0.0039
Ecliptic Z          -10.15274236 +/-    0.0018
Ecliptic XDOT        -0.00104639 +/-    0.0000
Ecliptic YDOT        -0.00280233 +/-    0.0000
Ecliptic ZDOT         0.00027727 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.07498850 +/-    0.0049
Geocenter to KBO     40.17855857 +/-    0.0070
# Hcoef:  6.14

The following table shows the complete astrometric record for 12BA155. 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 (12BA155) followed by the observatory code and reference code for the source of the astrometry.

2012 01  25.41375  09 28 56.882  -00 34 07.16  22.4w 12BA155   F51  C~1w3p      
2012 01  25.42802  09 28 56.821  -00 34 06.81  22.3w 12BA155   F51  C~1w3p      
2012 01  25.44233  09 28 56.756  -00 34 06.56  22.5w 12BA155   F51  C~1w3p      
2012 01  25.45668  09 28 56.690  -00 34 06.46  22.4w 12BA155   F51  C~1w3p      
2012 02  12.47603  09 27 32.470  -00 28 09.87  21.5i 12BA155   F51  C~1w3p      
2012 02  12.48862  09 27 32.414  -00 28 09.57  21.9i 12BA155   F51  C~1w3p      
2014 01  11.48746  09 41 34.724  -01 31 41.60  21.5i 12BA155   F51  C~1w3p      
2014 01  31.46944  09 40 08.543  -01 27 25.38  22.3w 12BA155   F51  C~1w3p      
2014 01  31.48240  09 40 08.495  -01 27 25.04  21.9w 12BA155   F51  C~1w3p      
2014 01  31.49536  09 40 08.424  -01 27 24.47  22.2w 12BA155   F51  C~1w3p      
2014 01  31.50830  09 40 08.354  -01 27 24.39  22.1w 12BA155   F51  C~1w3p      
2014 02  24.34699  09 38 15.951  -01 17 56.61  21.9w 12BA155   F51  C~1w3p      
2014 02  24.35854  09 38 15.901  -01 17 56.29  21.8w 12BA155   F51  C~1w3p      
2014 02  24.37010  09 38 15.842  -01 17 55.92  22.1w 12BA155   F51  C~1w3p      
2014 02  24.38168  09 38 15.789  -01 17 55.70  21.9w 12BA155   F51  C~1w3p      

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    -0.04       0.00    -0.17
  2   0.0000     -0.98    -0.01       0.03    -0.02
  3   0.0001     -1.98    -0.01      -0.05     0.01
  4   0.0001     -2.95     0.03      -0.27    -0.10
  5   0.0495  -1313.53    -0.02     -73.65     0.13
  6   0.0495  -1314.42     0.04     -73.64     0.16
  7   1.9632  11884.61     0.34     422.43     0.01
  8   2.0179  10575.17    -0.12     245.64    -0.15
  9   2.0180  10574.38     0.04     245.73     0.01
 10   2.0180  10573.18    -0.21     245.92     0.28
 11   2.0181  10572.16    -0.28     245.66     0.08
 12   2.0833   8789.64     0.04     236.08    -0.05
 13   2.0834   8788.82     0.10     236.14    -0.04
 14   2.0834   8787.87     0.02     236.21    -0.02
 15   2.0834   8787.04     0.08     236.16    -0.12

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.

12BA155    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        54.923    55.520    54.362
ecceobj         0.366     0.379     0.354
incobj         14.374    14.374    14.373
qmin           33.214    33.401    33.757
qmax           79.380    79.347    76.565
amean          55.796    55.464    54.496
amin           54.519    54.477    53.768
amax           56.720    56.662    55.522
emean           0.382     0.380     0.362
emin            0.357     0.358     0.343
emax            0.404     0.400     0.381
imean          15.043    15.285    14.878
imin           13.382    14.303    13.883
imax           16.358    16.185    15.764
excite_mean     0.462     0.463     0.444
fracstop        1.000     1.000     1.000
cjmean          2.969     2.964     2.976

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       174.2     176.3     176.3
kozaiamp        180.0     180.0     180.0