Orbit Fit and Astrometric record for 13RX157

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: 13RX157   
# Created Tue Apr  1 01:09:39 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting     17 observations of     17
# Arc:   5.03y
# First observation: 2013/09/11
#  Last observation: 2018/09/21
# Chi-squared of fit:     8.84 DOF:     28 RMS:  0.13
# Min/Max residuals:    -0.32    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.542480E-05  2.319760E-02  2.600191E-06  4.946373E-03  2.453351E-02 -8.268135E-04
# Covariance matrix:
  4.8665E-13  1.0749E-13 -2.1828E-14  4.4250E-14  5.5933E-13  1.7650E-12
  1.0749E-13  6.5995E-13 -6.5675E-14  1.4950E-13  1.0677E-12  5.9763E-12
 -2.1828E-14 -6.5675E-14  3.1200E-13 -8.5181E-14 -1.1705E-13 -6.1823E-13
  4.4250E-14  1.4950E-13 -8.5181E-14  5.7263E-14  2.5565E-13  1.4030E-12
  5.5933E-13  1.0677E-12 -1.1705E-13  2.5565E-13  2.3090E-12  1.0212E-11
  1.7650E-12  5.9763E-12 -6.1823E-13  1.4030E-12  1.0212E-11  5.6082E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
   -4.554902   -0.359701    0.196597   -0.078373   -0.985016  2456546.788338
# Heliocentric elements and errors
Epoch:              2456546.5000  =  2013/09/11
Mean Anomaly:          257.27577 +/-     0.292
Argument of Peri:       86.96713 +/-     0.269
Long of Asc Node:       19.38335 +/-     0.000
Inclination:            12.80510 +/-     0.000
Eccentricity:         0.04278919 +/-    0.0003
Semi-Major Axis:     41.28587412 +/-    0.0084
Time of Perihelion: 2484194.9677 +/-      81.4
Perihelion:          39.51928495 +/-    0.0139
Aphelion:            43.05246330 +/-    0.0144
Period (y)              265.2836 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.61762370 +/-    0.0025
Ecliptic Y           -0.45478245 +/-    0.0000
Ecliptic Z           -3.23688844 +/-    0.0002
Ecliptic XDOT        -0.00003807 +/-    0.0000
Ecliptic YDOT         0.00258785 +/-    0.0000
Ecliptic ZDOT         0.00055772 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   41.74581439 +/-    0.0025
Geocenter to KBO     40.76062667 +/-    0.0025
# Hcoef:  7.49

The following table shows the complete astrometric record for 13RX157. 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 (13RX157) followed by the observatory code and reference code for the source of the astrometry.

2013 09  11.28756  00 05 56.482  -04 19 16.91  24.1g 13RX157   W84  C~52RP      
2013 09  11.28894  00 05 56.483  -04 19 16.93  23.8r 13RX157   W84  C~52RP      
2013 10  13.12737  00 03 32.567  -04 32 52.97  23.2i 13RX157   W84  C~52RP      
2013 10  13.12878  00 03 32.583  -04 32 53.11  23.0z 13RX157   W84  C~52RP      
2014 10  29.18375  00 06 54.144  -03 50 49.07  23.5r 13RX157   W84  C~52RP      
2016 11  26.11554  00 14 19.813  -02 21 29.57  23.1r 13RX157   W84  C~52RP      
2016 11  26.11692  00 14 19.813  -02 21 29.83  23.3i 13RX157   W84  C~52RP      
2016 12  04.10151  00 14 07.342  -02 21 42.72  24.2r 13RX157   W84  C~52RP      
2017 09  18.23188  00 23 08.418  -01 11 47.83  23.9r 13RX157   W84  C~52RP      
2017 09  18.23326  00 23 08.403  -01 11 47.99  24.3g 13RX157   W84  C~52RP      
2017 11  09.06291  00 19 28.335  -01 31 27.48  24.0r 13RX157   W84  C~52RP      
2018 09  09.21996  00 28 15.455  -00 19 43.75  24.9g 13RX157   W84  C~52RP      
2018 09  09.32865  00 28 14.966  -00 19 46.64  23.7r 13RX157   W84  C~52RP      
2018 09  09.33003  00 28 14.964  -00 19 46.64  23.0i 13RX157   W84  C~52RP      
2018 09  14.32202  00 27 53.351  -00 21 57.72  23.8r 13RX157   W84  C~52RP      
2018 09  14.32338  00 27 53.341  -00 21 57.75  24.1g 13RX157   W84  C~52RP      
2018 09  21.27628  00 27 22.212  -00 25 03.07  22.6z 13RX157   W84  C~52RP      

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    -0.14       0.00     0.07
     2   0.0000      0.00    -0.03       0.00     0.09
     3   0.0872      0.00    -0.16       0.00     0.10
     4   0.0872      0.00     0.17       0.00    -0.01
     5   1.1304      0.00     0.12       0.00    -0.17
     6   3.2083      0.00    -0.01       0.00    -0.06
     7   3.2083      0.00     0.03       0.00    -0.32
     8   3.2302      0.00     0.05       0.00    -0.09
     9   4.0190      0.00     0.22       0.00     0.14
    10   4.0190      0.00     0.09       0.00     0.02
    11   4.1609      0.00    -0.03       0.00     0.15
    12   4.9937      0.00     0.14       0.00     0.05
    13   4.9940      0.00    -0.14       0.00    -0.03
    14   4.9940      0.00    -0.09       0.00     0.01
    15   5.0076      0.00    -0.10       0.00    -0.09
    16   5.0076      0.00    -0.16       0.00    -0.09
    17   5.0267      0.00     0.11       0.00     0.26

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.

13RX157    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        41.493    41.493    41.493
ecceobj         0.040     0.040     0.040
incobj         12.774    12.774    12.774
qmin           38.565    38.568    38.567
qmax           44.230    44.233    44.227
amean          41.326    41.326    41.326
amin           41.006    41.009    41.005
amax           41.656    41.655    41.655
emean           0.045     0.045     0.045
emin            0.027     0.027     0.027
emax            0.063     0.063     0.063
imean          11.786    11.786    11.786
imin           10.626    10.627    10.630
imax           12.925    12.925    12.925
excite_mean     0.209     0.209     0.209
fracstop        1.000     1.000     1.000
cjmean          3.019     3.019     3.019

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       178.9     179.0     178.9
kozaiamp        180.0     180.0     179.9