Orbit Fit and Astrometric record for 12BX154

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: 12BX154   
# Created Sun Dec 17 02:37:44 2017
# Orbit generated from Bernstein formalism
# Fitting   18 observations of   18
# Arc:   3.74y
# First observation: 2010/05/31
#  Last observation: 2014/02/26
Preliminary a, adot, b, bdot, g, gdot:
   0.000257   0.027852  -0.000077  -0.004917   0.025223   0.000000
# Chi-squared of fit:    23.65 DOF:   30 RMS:  0.20
# Min/Max residuals:    -0.72    0.39
# Exact a, adot, b, bdot, g, gdot:
  1.851577E-05  2.786861E-02 -3.245052E-06 -4.889250E-03  2.446238E-02  6.199985E-03
# Covariance matrix:
  1.2988E-12 -4.0360E-13 -1.9859E-14  4.3049E-14 -7.1378E-13 -2.2903E-12
 -4.0360E-13  2.0136E-12  2.1845E-13 -2.6406E-13 -7.3467E-13  1.3383E-11
 -1.9859E-14  2.1845E-13  3.6735E-13 -1.6633E-13 -9.1607E-14  1.4999E-12
  4.3049E-14 -2.6406E-13 -1.6633E-13  1.0690E-13  9.3860E-14 -1.8225E-12
 -7.1378E-13 -7.3467E-13 -9.1607E-14  9.3860E-14  9.9976E-13 -4.6610E-12
 -2.2903E-12  1.3383E-11  1.4999E-12 -1.8225E-12 -4.6610E-12  9.2421E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.428964  151.564311   -1.004080   -0.003463    0.136711  2455347.776556
# Heliocentric elements and errors
Epoch:              2455340.5000  =  2010/05/24
Mean Anomaly:           13.53687 +/-     0.018
Argument of Peri:      129.01619 +/-     0.029
Long of Asc Node:      340.99966 +/-     0.000
Inclination:            10.16498 +/-     0.001
Eccentricity:         0.49139287 +/-    0.0005
Semi-Major Axis:     73.08087313 +/-    0.0625
Time of Perihelion: 2446759.8610 +/-       3.5
Perihelion:          37.16945337 +/-    0.0486
Aphelion:           108.99229289 +/-    0.1001
Period (y)              624.7608 +/-      0.80
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -36.29007994 +/-    0.0015
Ecliptic Y           18.50865549 +/-    0.0008
Ecliptic Z            1.01933204 +/-    0.0001
Ecliptic XDOT        -0.00210566 +/-    0.0000
Ecliptic YDOT        -0.00239993 +/-    0.0000
Ecliptic ZDOT        -0.00052977 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   40.75020574 +/-    0.0014
Geocenter to KBO     40.87909946 +/-    0.0017
# Hcoef:  6.30

The following table shows the complete astrometric record for 12BX154. 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 (12BX154) followed by the observatory code and reference code for the source of the astrometry.

2010 05  31.27579  10 16 24.428  +12 15 11.30  22.7w 12BX154   F51  C~1w3p      
2011 02  03.60598  10 27 27.785  +11 01 57.87  22.2r 12BX154   F51  C~1w3p      
2011 02  04.58102  10 27 23.510  +11 02 19.73  22.0r 12BX154   F51  C~1w3p      
2011 02  04.59182  10 27 23.493  +11 02 20.12  22.3r 12BX154   F51  C~1w3p      
2012 01  21.44467  10 33 57.807  +10 06 05.99  22.7w 12BX154   F51  C~1w3p      
2012 01  21.45876  10 33 57.750  +10 06 06.11  22.5w 12BX154   F51  C~1w3p      
2012 01  21.58364  10 33 57.279  +10 06 08.88  22.3g 12BX154   F51  C~1w3p      
2012 02  03.57964  10 33 05.841  +10 10 42.69  22.5r 12BX154   F51  C~1w3p      
2012 02  16.51494  10 32 08.150  +10 15 47.88  22.5w 12BX154   F51  C~1w3p      
2012 02  16.52958  10 32 08.094  +10 15 47.99  22.6w 12BX154   F51  C~1w3p      
2012 02  16.54420  10 32 08.013  +10 15 48.23  22.3w 12BX154   F51  C~1w3p      
2012 02  16.55893  10 32 07.954  +10 15 48.64  22.9w 12BX154   F51  C~1w3p      
2013 02  13.53882  10 37 49.737  +09 24 05.25  22.0g 12BX154   F51  C~1w3p      
2013 02  14.40662  10 37 45.893  +09 24 26.01  22.2w 12BX154   F51  C~1w3p      
2013 02  14.43587  10 37 45.760  +09 24 26.81  22.3w 12BX154   F51  C~1w3p      
2014 02  10.42173  10 43 29.766  +08 32 21.90  21.5i 12BX154   F51  C~1w3p      
2014 02  10.43362  10 43 29.721  +08 32 22.47  21.8i 12BX154   F51  C~1w3p      
2014 02  26.38695  10 42 18.022  +08 38 47.96  22.4w 12BX154   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    -0.10       0.00     0.02
  2   0.6799  10684.76    -0.25    -561.66     0.27
  3   0.6826  10618.01     0.01    -564.42    -0.34
  4   0.6826  10617.63     0.39    -564.15    -0.04
  5   1.6432  17298.36     0.05   -1555.33     0.07
  6   1.6432  17297.52     0.03   -1555.53    -0.10
  7   1.6436  17289.98    -0.24   -1555.54     0.19
  8   1.6791  16477.68    -0.04   -1583.29     0.25
  9   1.7145  15568.12    -0.06   -1615.45     0.11
 10   1.7146  15567.31     0.20   -1615.66    -0.05
 11   1.7146  15566.10     0.08   -1615.88    -0.22
 12   1.7147  15565.13     0.20   -1615.82    -0.12
 13   2.7085  21457.10    -0.72   -2621.80    -0.19
 14   2.7108  21395.93     0.13   -2623.82     0.02
 15   2.7109  21393.78     0.12   -2623.81     0.12
 16   3.6992  27376.06     0.01   -3615.01    -0.09
 17   3.6993  27375.21    -0.00   -3614.73     0.23
 18   3.7429  26225.75     0.21   -3658.19    -0.14

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.

12BX154    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        73.752    73.946    73.559
ecceobj         0.496     0.498     0.495
incobj         10.156    10.156    10.156
qmin           36.137    36.204    36.269
qmax          113.793   114.255   112.625
amean          73.538    73.912    73.238
amin           71.994    72.600    72.086
amax           75.311    75.586    74.852
emean           0.495     0.497     0.492
emin            0.480     0.483     0.480
emax            0.511     0.512     0.505
imean          10.698    10.917    10.836
imin            9.868    10.258    10.297
imax           11.535    11.617    11.506
excite_mean     0.529     0.532     0.527
fracstop        1.000     1.000     1.000
cjmean          3.077     3.077     3.077

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       202.1     186.9     186.9
kozaiamp        179.9     180.0     180.0