Orbit Fit and Astrometric record for 15RK281

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: 15RK281   
# Created Sun Nov 24 02:10:26 2024
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   2.44y
# First observation: 2015/07/14
#  Last observation: 2017/12/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000054   0.023247   0.000003   0.000534   0.023668   0.000000
# Chi-squared of fit:     8.57 DOF:     48 RMS:  0.10
# Min/Max residuals:    -0.24    0.29
# Exact a, adot, b, bdot, g, gdot:
  1.598138E-05  2.289203E-02  3.005890E-07  5.245575E-04  2.345957E-02 -1.003537E-03
# Covariance matrix:
  2.0404E-13  2.9405E-14 -3.4026E-15  3.7347E-15  1.6661E-13  2.4644E-12
  2.9405E-14  4.3138E-13 -8.3575E-15  1.7109E-14  3.2379E-13  1.1133E-11
 -3.4026E-15 -8.3575E-15  1.1347E-13 -7.3589E-14 -8.9436E-15 -2.5865E-13
  3.7347E-15  1.7109E-14 -7.3589E-14  8.9802E-14  1.4563E-14  5.7633E-13
  1.6661E-13  3.2379E-13 -8.9436E-15  1.4563E-14  3.8682E-13  9.5162E-12
  2.4644E-12  1.1133E-11 -2.5865E-13  5.7633E-13  9.5162E-12  3.7452E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.835584   11.901069    1.002469    0.005696   -0.174567  2457218.063999
# Heliocentric elements and errors
Epoch:              2457210.5000  =  2015/07/07
Mean Anomaly:          298.13843 +/-     0.165
Argument of Peri:      123.04454 +/-     0.253
Long of Asc Node:      317.29028 +/-     0.015
Inclination:             2.28019 +/-     0.000
Eccentricity:         0.07513856 +/-    0.0008
Semi-Major Axis:     44.17192130 +/-    0.0058
Time of Perihelion: 2475636.7214 +/-      49.1
Perihelion:          40.85290677 +/-    0.0361
Aphelion:            47.49093583 +/-    0.0362
Period (y)              293.5808 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           42.06290111 +/-    0.0011
Ecliptic Y            7.84151430 +/-    0.0002
Ecliptic Z            1.36545631 +/-    0.0000
Ecliptic XDOT        -0.00066969 +/-    0.0000
Ecliptic YDOT         0.00258336 +/-    0.0000
Ecliptic ZDOT         0.00005750 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.80936191 +/-    0.0011
Geocenter to KBO     42.62652007 +/-    0.0011
# Hcoef:  8.54

The following table shows the complete astrometric record for 15RK281. 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 (15RK281) followed by the observatory code and reference code for the source of the astrometry.

2015 07  14.56321  00 40 53.398  +06 23 40.88  25.4r 15RK281   568  C~2nvt      
2015 07  19.54121  00 40 51.658  +06 23 45.37  25.3r 15RK281   568  C~2nvt      
2015 08  13.49630  00 40 12.882  +06 20 51.19  24.8r 15RK281   568  C~2nvt      
2015 08  20.43431  00 39 53.980  +06 19 08.66  25.0r 15RK281   568  C~2nvt      
2015 08  20.48358  00 39 53.830  +06 19 07.72  24.8r 15RK281   568  C~2nvt      
2015 09  09.40852  00 38 44.250  +06 12 25.10  24.8r 15RK281   568  C~2nvt      
2015 09  09.44963  00 38 44.077  +06 12 24.19  24.8r 15RK281   568  C~2nvt      
2015 09  09.49055  00 38 43.913  +06 12 23.19  24.5r 15RK281   568  C~2nvt      
2015 09  18.47788  00 38 06.949  +06 08 40.01  25.2w 15RK281   568  C~2nvt      
2015 10  08.36567  00 36 39.899  +05 59 37.91  25.1w 15RK281   568  C~2nvt      
2015 10  08.41827  00 36 39.662  +05 59 36.33  24.9w 15RK281   568  C~2nvt      
2015 10  09.33525  00 36 35.619  +05 59 10.79  25.2w 15RK281   568  C~2nvt      
2015 12  08.25986  00 33 22.733  +05 37 18.42  25.3w 15RK281   568  C~2nvt      
2016 01  01.32225  00 33 17.882  +05 35 46.14  24.9w 15RK281   568  C~2nvt      
2016 01  02.27354  00 33 18.759  +05 35 49.06  25.2w 15RK281   568  C~2nvt      
2016 09  05.50664  00 43 49.745  +06 46 37.08  25.2w 15RK281   568  C~2nvt      
2016 09  06.46082  00 43 46.116  +06 46 15.76  24.8w 15RK281   568  C~2nvt      
2016 09  06.50211  00 43 45.966  +06 46 14.83  25.1w 15RK281   568  C~2nvt      
2016 09  26.45968  00 42 22.911  +06 37 54.36  24.6w 15RK281   568  C~2nvt      
2016 11  04.27703  00 39 38.615  +06 20 21.11  25.2w 15RK281   568  C~2nvt      
2016 11  04.33644  00 39 38.393  +06 20 19.72  24.9w 15RK281   568  C~2nvt      
2016 12  29.27436  00 38 02.450  +06 08 09.37  25.2w 15RK281   568  C~2nvt      
2017 01  03.24627  00 38 06.337  +06 08 20.78  25.0w 15RK281   568  C~2nvt      
2017 09  15.43089  00 48 06.314  +07 15 45.87  24.4w 15RK281   568  C~2nvt      
2017 09  16.51398  00 48 01.819  +07 15 19.39  25.2w 15RK281   568  C~2nvt      
2017 09  22.46739  00 47 36.574  +07 12 48.03  24.6w 15RK281   568  C~2nvt      
2017 12  23.28322  00 42 49.473  +06 40 46.24  25.4w 15RK281   568  C~2nvt      

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    -0.11       0.00     0.01
     2   0.0136    -22.11     0.15      14.29     0.02
     3   0.0820   -622.18     0.20      80.53    -0.13
     4   0.1009   -921.62     0.01      96.68     0.07
     5   0.1011   -924.05    -0.06      96.69    -0.05
     6   0.1556  -2036.36     0.04     133.42    -0.05
     7   0.1557  -2039.09    -0.03     133.60     0.04
     8   0.1559  -2041.73    -0.02     133.64     0.00
     9   0.1805  -2636.41    -0.23     144.90    -0.13
    10   0.2349  -4043.79     0.07     156.99     0.01
    11   0.2351  -4047.66     0.02     156.93    -0.08
    12   0.2376  -4113.18    -0.01     157.19     0.11
    13   0.4016  -7278.36     0.05      85.69     0.07
    14   0.4675  -7381.46     0.06      29.47     0.16
    15   0.4701  -7368.26    -0.03      26.98    -0.01
    16   1.1470   2956.85    -0.01     239.23     0.02
    17   1.1496   2898.75     0.01     240.70    -0.01
    18   1.1497   2896.33     0.16     240.72    -0.08
    19   1.2044   1561.66    -0.08     263.38     0.01
    20   1.3106  -1103.94    -0.09     253.16     0.01
    21   1.3108  -1107.53    -0.06     253.18     0.07
    22   1.4612  -2710.16     0.00     143.08    -0.00
    23   1.4748  -2652.36    -0.14     130.80     0.00
    24   2.1735   7158.67    -0.05     363.29    -0.24
    25   2.1765   7086.66    -0.05     364.85    -0.01
    26   2.1928   6681.26    -0.03     371.25     0.29
    27   2.4441   1993.14     0.24     266.90    -0.07

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.

15RK281    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.628    44.641    44.616
ecceobj         0.078     0.080     0.077
incobj          2.276     2.276     2.276
qmin           39.929    39.895    39.987
qmax           48.992    49.136    48.891
amean          44.371    44.383    44.359
amin           44.007    44.037    44.000
amax           44.746    44.760    44.735
emean           0.080     0.082     0.079
emin            0.065     0.066     0.064
emax            0.096     0.098     0.093
imean           3.604     3.601     3.607
imin            2.862     2.854     2.867
imax            4.265     4.263     4.260
excite_mean     0.102     0.104     0.101
fracstop        1.000     1.000     1.000
cjmean          3.093     3.093     3.093

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       180.7     180.8     180.5
kozaiamp        180.0     180.0     180.0