Orbit Fit and Astrometric record for 09JX18

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: 09JX18    
# Created Sat Mar 30 01:13:20 2024
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:  10.92d
# First observation: 2009/05/14
#  Last observation: 2009/05/25
Preliminary a, adot, b, bdot, g, gdot:
  -0.000000   0.037815  -0.000000  -0.009153   0.034103   0.000000
# WARNING Fitting with energy constraint
# Chi-squared of fit:     2.13 DOF:     11 RMS:  0.09
# Min/Max residuals:    -0.22    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.667749E-05  3.578245E-02 -4.807247E-06 -1.003608E-02  3.357606E-02 -1.172563E-02
# Covariance matrix:
  1.2947E-12  1.1589E-09  1.7561E-13  4.5141E-10  3.6254E-10 -4.0070E-09
  1.1589E-09  1.7616E-06  2.5569E-10  6.7667E-07  5.3922E-07 -9.6978E-06
  1.7561E-13  2.5569E-10  5.3771E-13  7.7647E-11  7.9208E-11  2.3314E-11
  4.5141E-10  6.7667E-07  7.7647E-11  2.6167E-07  2.0694E-07 -4.2493E-06
  3.6254E-10  5.3922E-07  7.9208E-11  2.0694E-07  1.6547E-07 -2.4723E-06
 -4.0070E-09 -9.6978E-06  2.3314E-11 -4.2493E-06 -2.4723E-06  8.5705E-04
#      lat0       lon0       xBary       yBary       zBary        JD0
   13.525581  179.246317   -0.816861    0.138563   -0.576131  2454965.856378
# Heliocentric elements and errors
Epoch:              2454960.5000  =  2009/05/09
Mean Anomaly:          292.93187 +/-    85.454
Argument of Peri:      238.65678 +/-    35.967
Long of Asc Node:       39.51867 +/-     2.477
Inclination:            20.65980 +/-     1.018
Eccentricity:         0.27853221 +/-    0.7355
Semi-Major Axis:     31.45478387 +/-   15.4733
Time of Perihelion: 2466964.9482 +/-   12469.3
Perihelion:          22.69361336 +/-   25.6866
Aphelion:            40.21595438 +/-   30.4393
Period (y)              176.4161 +/-    130.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -29.55507689 +/-    0.3508
Ecliptic Y           -0.43264992 +/-    0.0046
Ecliptic Z            6.96556350 +/-    0.0844
Ecliptic XDOT         0.00070474 +/-    0.0023
Ecliptic YDOT        -0.00292321 +/-    0.0001
Ecliptic ZDOT        -0.00101938 +/-    0.0005
# Distances at JD0 (AU)
Heliocenter to KBO   30.36789144 +/-    0.3420
Geocenter to KBO     29.78312959 +/-    0.3608
# Hcoef:  9.70

The following table shows the complete astrometric record for 09JX18. 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 (09JX18) followed by the observatory code and reference code for the source of the astrometry.

2009 05  14.355612 12 19 07.250  +12 41 22.20  24.2i 09JX18    568  C~0aRU      
2009 05  14.439089 12 19 06.900  +12 41 21.80  24.5i 09JX18    568  C~0aRU      
2009 05  15.432224 12 19 03.130  +12 41 16.10  24.5i 09JX18    568  C~0aRU      
2009 05  22.323191 12 18 39.480  +12 40 12.60  25.1g 09JX18    568  C~0aRU      
2009 05  22.379034 12 18 39.300  +12 40 12.00  25.2g 09JX18    568  C~0aRU      
2009 05  24.288213 12 18 33.660  +12 39 46.50  25.1g 09JX18    568  C~0aRU      
2009 05  24.345698 12 18 33.490  +12 39 45.70  24.8g 09JX18    568  C~0aRU      
2009 05  25.271680 12 18 30.900  +12 39 32.20  25.0g 09JX18    568  C~0aRU      

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     0.02
     2   0.0002     -4.51    -0.22      -2.45    -0.05
     3   0.0029    -52.57     0.24     -30.15     0.03
     4   0.0218   -342.76    -0.03    -229.16    -0.03
     5   0.0220   -344.92    -0.11    -230.78     0.05
     6   0.0272   -409.92     0.05    -287.69    -0.03
     7   0.0274   -411.87     0.05    -289.43    -0.01
     8   0.0299   -440.99    -0.01    -317.20     0.02

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.

09JX18    quality flag:0

Type:      ERR2LARGE ERR2LARGE ERR2LARGE

axisobj         0.000     0.000     0.000
ecceobj        -1.000    -1.000    -1.000
incobj         -1.000    -1.000    -1.000
qmin            0.000     0.000     0.000
qmax            0.000     0.000     0.000
amean           0.000     0.000     0.000
amin            0.000     0.000     0.000
amax            0.000     0.000     0.000
emean           0.000     0.000     0.000
emin            0.000     0.000     0.000
emax            0.000     0.000     0.000
imean           0.000     0.000     0.000
imin            0.000     0.000     0.000
imax            0.000     0.000     0.000
excite_mean     0.000     0.000     0.000
fracstop        0.000     0.000     0.000
cjmean          0.000     0.000     0.000

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         0.0       0.0       0.0
kozaiamp          0.0       0.0       0.0