Orbit Fit and Astrometric record for 15KR174

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: 15KR174   
# Created Sat Dec  4 02:13:25 2021
# Orbit generated from Bernstein formalism
# Fitting     24 observations of     24
# Arc:   2.09y
# First observation: 2015/02/23
#  Last observation: 2017/03/28
Preliminary a, adot, b, bdot, g, gdot:
  -0.000917   0.133637   0.002904   0.103964   0.078685   0.000000
# Chi-squared of fit:     3.58 DOF:     42 RMS:  0.07
# Min/Max residuals:    -0.12    0.17
# Exact a, adot, b, bdot, g, gdot:
  2.772347E-05  1.381461E-01  2.181118E-05  1.114244E-01  7.982638E-02  7.335171E-02
# Covariance matrix:
  2.2186E-13 -8.5835E-14 -1.3408E-14  1.5278E-14  1.2984E-13  1.1884E-13
 -8.5835E-14  1.0618E-12 -1.8635E-13  8.5579E-13  3.1331E-13  4.6391E-12
 -1.3408E-14 -1.8635E-13  1.5306E-13 -2.9941E-13 -7.9173E-14 -1.0367E-12
  1.5278E-14  8.5579E-13 -2.9941E-13  1.1078E-12  3.1278E-13  4.7645E-12
  1.2984E-13  3.1331E-13 -7.9173E-14  3.1278E-13  2.5089E-13  1.7350E-12
  1.1884E-13  4.6391E-12 -1.0367E-12  4.7645E-12  1.7350E-12  2.5825E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    5.772775 -122.816588    0.978587    0.012640   -0.123764  2457077.136848
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:            1.37953 +/-     0.001
Argument of Peri:      328.37189 +/-     0.002
Long of Asc Node:      225.56042 +/-     0.000
Inclination:            38.66014 +/-     0.000
Eccentricity:         0.87740824 +/-    0.0000
Semi-Major Axis:     91.77256367 +/-    0.0305
Time of Perihelion: 2455839.9601 +/-       0.0
Perihelion:          11.25056027 +/-    0.0054
Aphelion:           172.29456708 +/-    0.0574
Period (y)              879.1794 +/-      0.44
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           -7.64727247 +/-    0.0000
Ecliptic Y          -10.04838537 +/-    0.0001
Ecliptic Z            1.26031552 +/-    0.0000
Ecliptic XDOT         0.00283012 +/-    0.0000
Ecliptic YDOT        -0.00435394 +/-    0.0000
Ecliptic ZDOT         0.00405534 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   12.69012293 +/-    0.0001
Geocenter to KBO     12.52718700 +/-    0.0001
# Hcoef: 12.87

The following table shows the complete astrometric record for 15KR174. 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 (15KR174) followed by the observatory code and reference code for the source of the astrometry.

2015 02  23.63607  15 45 01.463  -13 54 18.87  23.8r 15KR174   568  C~2lVK      
2015 03  19.59543  15 45 16.071  -13 17 17.75  24.1r 15KR174   568  C~2lVK      
2015 03  19.60407  15 45 16.052  -13 17 16.58  24.1r 15KR174   568  C~2lVK      
2015 03  22.51769  15 45 05.702  -13 12 07.22  23.9r 15KR174   568  C~2lVK      
2015 04  13.55184  15 42 33.610  -12 29 59.65  23.8r 15KR174   568  C~2lVK      
2015 04  13.59295  15 42 33.202  -12 29 54.72  23.8r 15KR174   568  C~2lVK      
2015 04  18.55634  15 41 43.630  -12 19 56.02  23.9r 15KR174   568  C~2lVK      
2015 05  21.31829  15 35 03.283  -11 15 24.15  23.7r 15KR174   568  C~2lVK      
2015 05  21.35947  15 35 02.741  -11 15 19.62  24.0r 15KR174   568  C~2lVK      
2015 05  21.40058  15 35 02.199  -11 15 15.02  24.1r 15KR174   568  C~2lVK      
2015 05  22.47722  15 34 48.344  -11 13 17.08  23.8r 15KR174   568  C~2lVK      
2015 05  25.46768  15 34 10.216  -11 07 54.79  23.9r 15KR174   568  C~2lVK      
2015 06  20.37343  15 29 18.527  -10 28 05.41  24.1r 15KR174   568  C~2lVK      
2015 06  20.41439  15 29 18.133  -10 28 02.23  24.1r 15KR174   568  C~2lVK      
2015 06  23.43462  15 28 51.162  -10 24 19.31  24.2r 15KR174   568  C~2lVK      
2015 07  11.31733  15 26 54.130  -10 06 48.89  24.1r 15KR174   568  C~2lVK      
2015 07  18.37775  15 26 30.340  -10 02 03.42  24.2r 15KR174   568  C~2lVK      
2015 08  11.34850  15 26 54.717  -09 54 34.25  24.3r 15KR174   568  C~2lVK      
2016 04  03.59163  16 19 44.819  -08 26 54.43  24.5w 15KR174   568  C~2lVK      
2016 04  03.62006  16 19 44.657  -08 26 50.93  24.5w 15KR174   568  C~2lVK      
2016 04  09.58510  16 19 08.310  -08 15 13.30  24.2w 15KR174   568  C~2lVK      
2016 07  04.34273  16 03 48.577  -06 11 29.08  24.4w 15KR174   568  C~2lVK      
2016 07  05.41508  16 03 40.157  -06 10 53.76  24.7w 15KR174   568  C~2lVK      
2017 03  28.62637  16 50 10.821  -04 46 41.68  25.0w 15KR174   568  C~2lVK      

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    -0.07       0.00     0.05
     2   0.0656   -285.35    -0.10    2213.07    -0.12
     3   0.0656   -285.88    -0.01    2214.15     0.17
     4   0.0736   -501.90    -0.02    2482.30     0.05
     5   0.1339  -3235.10     0.06    4450.39     0.09
     6   0.1340  -3242.04    -0.02    4453.85     0.06
     7   0.1476  -4084.83    -0.03    4874.36    -0.00
     8   0.2373 -10705.24     0.09    7309.11    -0.12
     9   0.2374 -10714.08     0.07    7311.68    -0.11
    10   0.2375 -10722.93     0.03    7314.33    -0.03
    11   0.2405 -10949.36    -0.05    7382.28    -0.03
    12   0.2487 -11572.30    -0.00    7566.86    -0.05
    13   0.3196 -16337.57     0.08    8895.02     0.01
    14   0.3197 -16344.01    -0.00    8896.76     0.05
    15   0.3280 -16786.77     0.02    9020.71     0.07
    16   0.3770 -18731.58    -0.01    9638.41    -0.01
    17   0.3963 -19145.16     0.01    9834.08    -0.12
    18   0.4619 -18901.20    -0.08   10359.01    -0.05
    19   1.1087  26199.62     0.12   25816.91    -0.03
    20   1.1088  26196.54     0.05   25819.93     0.15
    21   1.1251  25521.14     0.03   26408.40     0.02
    22   1.3599  10385.77    -0.10   30942.16    -0.05
    23   1.3628  10253.85    -0.01   30950.28     0.03
    24   2.0917  52067.91    -0.04   45093.63    -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.

15KR174    quality flag:3

Type:       CENTAURR  CENTAURR  CENTAURR

axisobj        87.956    88.156    87.758
ecceobj         0.872     0.872     0.872
incobj         38.588    38.588    38.588
qmin           10.568    10.781    10.664
qmax          405.250   240.853   256.806
amean         136.916    78.460    99.293
amin           82.192    50.262    56.324
amax          208.265   125.998   134.782
emean           0.910     0.844     0.879
emin            0.849     0.749     0.804
emax            0.947     0.913     0.916
imean          40.116    39.387    40.963
imin           37.270    37.748    38.707
imax           46.118    43.012    45.076
excite_mean     1.116     1.057     1.096
fracstop        0.717     0.217     0.410
cjmean          1.540     1.696     1.598

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        91.3     153.1      96.8
kozaiamp        179.9     180.0     180.0