Orbit Fit and Astrometric record for 15RK258

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: 15RK258   
# Created Sat Dec  4 02:13:29 2021
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   1.16y
# First observation: 2015/09/05
#  Last observation: 2016/11/03
Preliminary a, adot, b, bdot, g, gdot:
   0.000008   0.014001   0.000001  -0.000009   0.017480   0.000000
# Chi-squared of fit:     7.87 DOF:     18 RMS:  0.14
# Min/Max residuals:    -0.35    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.357703E-05  1.415854E-02  3.348697E-07  2.384221E-06  1.760979E-02  7.542624E-03
# Covariance matrix:
  4.8619E-13  6.5209E-13 -3.2245E-14  4.8355E-14  1.2080E-12  7.9658E-11
  6.5209E-13  1.2467E-11 -2.6557E-13  1.0263E-12  9.1485E-12  1.1757E-09
 -3.2245E-14 -2.6557E-13  3.2697E-13 -3.1891E-13 -2.6167E-13 -2.4337E-11
  4.8355E-14  1.0263E-12 -3.1891E-13  5.6247E-13  6.0677E-13  1.0547E-10
  1.2080E-12  9.1485E-12 -2.6167E-13  6.0677E-13  9.5296E-12  8.2380E-10
  7.9658E-11  1.1757E-09 -2.4337E-11  1.0547E-10  8.2380E-10  1.1720E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
   -9.468207  -38.867774   -0.361596   -0.155266   -0.931942  2457270.567019
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           39.11149 +/-     1.989
Argument of Peri:      172.52446 +/-     0.292
Long of Asc Node:       51.50650 +/-     0.023
Inclination:             9.31411 +/-     0.000
Eccentricity:         0.51163320 +/-    0.0224
Semi-Major Axis:     72.98770712 +/-    2.2393
Time of Perihelion: 2432526.2177 +/-     535.8
Perihelion:          35.64477301 +/-    1.9664
Aphelion:           110.33064123 +/-    3.7588
Period (y)              623.5665 +/-     28.70
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           44.57094768 +/-    0.0076
Ecliptic Y          -35.46093219 +/-    0.0062
Ecliptic Z           -9.34139164 +/-    0.0016
Ecliptic XDOT         0.00228012 +/-    0.0000
Ecliptic YDOT         0.00098160 +/-    0.0000
Ecliptic ZDOT        -0.00019249 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   57.71749031 +/-    0.0070
Geocenter to KBO     56.78660460 +/-    0.0100
# Hcoef:  7.12

The following table shows the complete astrometric record for 15RK258. 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 (15RK258) followed by the observatory code and reference code for the source of the astrometry.

2015 09  05.06623  21 47 13.164  -23 23 58.40  25. r 15RK258   807  C~2ZsD      
2015 09  05.14076  21 47 12.908  -23 23 59.03        15RK258   807  C~2ZsD      
2015 09  05.22453  21 47 12.624  -23 24 00.35        15RK258   807  C~2ZsD      
2015 10  16.09943  21 45 22.140  -23 28 14.04        15RK258   304  C~2ZsD      
2015 10  16.16906  21 45 22.007  -23 28 13.81        15RK258   304  C~2ZsD      
2016 09  25.18782  21 49 24.406  -23 11 06.54        15RK258   304  C~2ZsD      
2016 09  27.19436  21 49 18.948  -23 11 19.34  24.7r 15RK258   304  C~2ZsD      
2016 09  27.22916  21 49 18.847  -23 11 19.47  24.6r 15RK258   304  C~2ZsD      
2016 09  28.03954  21 49 16.702  -23 11 24.27  24.6r 15RK258   304  C~2ZsD      
2016 10  01.03537  21 49 09.005  -23 11 39.42  24.6r 15RK258   304  C~2ZsD      
2016 11  02.07785  21 48 19.300  -23 10 44.05        15RK258   304  C~2ZsD      
2016 11  03.05266  21 48 18.886  -23 10 35.69  24.8r 15RK258   304  C~2ZsD      

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    -0.18       0.00    -0.07
     2   0.0002     -3.53     0.05       0.60     0.23
     3   0.0004     -7.66     0.14       0.67    -0.04
     4   0.1123  -1525.09     0.07     272.55    -0.17
     5   0.1125  -1526.74    -0.09     273.38     0.00
     6   1.0571   1962.86    -0.15     112.68     0.24
     7   1.0626   1887.74     0.09     126.31     0.00
     8   1.0627   1886.39     0.03     126.66     0.09
     9   1.0650   1856.95     0.04     132.23    -0.02
    10   1.0732   1752.00     0.14     154.14    -0.03
    11   1.1609   1126.25    -0.35     439.19    -0.22
    12   1.1635   1123.72     0.21     448.99    -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.

15RK258    quality flag:1

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        73.058    80.402    67.606
ecceobj         0.508     0.571     0.445
incobj          9.321     9.321     9.321
qmin           35.127    33.334    36.583
qmax          113.691   131.113   100.824
amean          73.320    79.724    67.865
amin           72.261    75.803    66.985
amax           74.774    82.844    69.054
emean           0.510     0.569     0.449
emin            0.501     0.545     0.440
emax            0.521     0.584     0.460
imean           8.620     8.379     7.995
imin            8.413     7.328     7.472
imax            8.808     9.175     8.602
excite_mean     0.532     0.587     0.471
fracstop        1.000     1.000     1.000
cjmean          3.064     3.025     3.099

libcent 0       184.9    -180.0    -180.0
libamp  0       165.6    -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       187.1     222.5     180.2
kozaiamp        180.0     179.9     179.9