Orbit Fit and Astrometric record for 15XO480

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: 15XO480   
# Created Sat Nov 27 02:13:52 2021
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.98y
# First observation: 2015/12/10
#  Last observation: 2018/12/02
Preliminary a, adot, b, bdot, g, gdot:
   0.000013   0.027128  -0.000076   0.018158   0.028766   0.000000
# Chi-squared of fit:     4.27 DOF:     10 RMS:  0.13
# Min/Max residuals:    -0.28    0.20
# Exact a, adot, b, bdot, g, gdot:
  1.548553E-05  2.732743E-02  1.137913E-05  1.829463E-02  2.880685E-02  2.638307E-03
# Covariance matrix:
  4.7796E-13 -4.2718E-13  3.8273E-14 -1.7250E-13 -1.0419E-13 -3.2296E-12
 -4.2718E-13  1.3988E-12 -1.8024E-13  8.6646E-13  4.0465E-13  1.6242E-11
  3.8273E-14 -1.8024E-13  4.6901E-13 -2.9899E-13 -2.1387E-13 -2.3140E-12
 -1.7250E-13  8.6646E-13 -2.9899E-13  7.1534E-13  2.9638E-13  1.1054E-11
 -1.0419E-13  4.0465E-13 -2.1387E-13  2.9638E-13  1.6435E-12  5.3065E-12
 -3.2296E-12  1.6242E-11 -2.3140E-12  1.1054E-11  5.3065E-12  2.0718E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -42.405606   24.731114   -0.784870   -0.403342   -0.441975  2457366.731829
# Heliocentric elements and errors
Epoch:              2457360.5000  =  2015/12/04
Mean Anomaly:           26.20308 +/-     0.069
Argument of Peri:      264.15789 +/-     0.115
Long of Asc Node:       70.01676 +/-     0.001
Inclination:            52.31313 +/-     0.000
Eccentricity:         0.19310136 +/-    0.0004
Semi-Major Axis:     42.04059490 +/-    0.0111
Time of Perihelion: 2450113.6129 +/-      19.0
Perihelion:          33.92249881 +/-    0.0176
Aphelion:            50.15869099 +/-    0.0201
Period (y)              272.5910 +/-      0.11
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           23.49286066 +/-    0.0010
Ecliptic Y           11.68614598 +/-    0.0005
Ecliptic Z          -23.40999804 +/-    0.0010
Ecliptic XDOT         0.00014552 +/-    0.0000
Ecliptic YDOT         0.00292022 +/-    0.0000
Ecliptic ZDOT         0.00111481 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.16402307 +/-    0.0010
Geocenter to KBO     34.71396460 +/-    0.0015
# Hcoef:  8.19

The following table shows the complete astrometric record for 15XO480. 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 (15XO480) followed by the observatory code and reference code for the source of the astrometry.

2015 12  10.23104  02 37 45.572  -29 43 32.50  23.0i 15XO480   W84  C~55XN      
2015 12  14.14850  02 37 25.142  -29 40 41.90  23.3r 15XO480   W84  C~55XN      
2016 01  12.12741  02 35 42.663  -29 10 57.47  24.4r 15XO480   W84  C~55XN      
2016 10  29.27593  02 46 35.684  -28 15 26.04  23.8i 15XO480   W84  C~55XN      
2018 01  16.06486  02 44 14.630  -25 56 20.14  24.0i 15XO480   W84  C~55XN      
2018 01  17.11530  02 44 13.062  -25 55 02.80  24.3r 15XO480   W84  C~55XN      
2018 11  26.22714  02 51 58.787  -25 01 03.32  22.7i 15XO480   W84  C~55XN      
2018 12  02.18277  02 51 22.683  -24 59 02.72  23.9g 15XO480   W84  C~55XN      

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    -0.28
     2   0.0107   -171.18    -0.01     265.82     0.18
     3   0.0901   -651.86     0.16    2444.37     0.10
     4   0.8872   8546.52    -0.08    1834.21    -0.03
     5   2.1022  10449.84    -0.04   10196.41    -0.04
     6   2.1051  10463.97     0.09   10275.67     0.09
     7   2.9623  17594.77     0.20   10462.37    -0.02
     8   2.9786  17204.99    -0.21   10788.36    -0.01

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.

15XO480    quality flag:2

Type:       SCATEXTD  SCATEXTD  SCATNEAR

axisobj        42.509    42.548    42.471
ecceobj         0.202     0.203     0.201
incobj         52.288    52.289    52.288
qmin           33.356    33.265    32.680
qmax           51.901    51.696    52.501
amean          42.324    42.323    42.323
amin           41.950    41.949    41.895
amax           42.774    42.757    42.813
emean           0.127     0.106     0.191
emin            0.034     0.008     0.150
emax            0.213     0.210     0.227
imean          51.517    51.616    51.042
imin           50.818    50.842    50.551
imax           52.120    52.157    51.477
excite_mean     0.795     0.794     0.801
fracstop        1.000     1.000     1.000
cjmean          2.173     2.173     2.175

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       266.7     270.8     269.2
kozaiamp         51.1      64.7      21.2