Orbit Fit and Astrometric record for 15RQ281

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: 15RQ281   
# Created Sat Dec  4 02:13:33 2021
# Orbit generated from Bernstein formalism
# Fitting     13 observations of     13
# Arc:   2.70y
# First observation: 2015/09/05
#  Last observation: 2018/05/19
Preliminary a, adot, b, bdot, g, gdot:
  -0.000092   0.012102   0.000062   0.003466   0.015483   0.000000
# Chi-squared of fit:    28.02 DOF:     20 RMS:  0.26
# Min/Max residuals:    -0.52    0.44
# Exact a, adot, b, bdot, g, gdot:
  1.227055E-05  1.241906E-02  4.328006E-06  3.592980E-03  1.623242E-02  8.943349E-03
# Covariance matrix:
  4.6511E-13 -1.2410E-13 -5.7824E-14  6.6086E-14  7.9213E-13  8.0299E-12
 -1.2410E-13  9.6847E-13 -1.1768E-13  2.6784E-13  9.5623E-13  2.6244E-11
 -5.7824E-14 -1.1768E-13  2.4944E-13 -1.7604E-13 -3.2419E-13 -5.6610E-12
  6.6086E-14  2.6784E-13 -1.7604E-13  2.5000E-13  5.2641E-13  1.0730E-11
  7.9213E-13  9.5623E-13 -3.2419E-13  5.2641E-13  3.6743E-12  5.6596E-11
  8.0299E-12  2.6244E-11 -5.6610E-12  1.0730E-11  5.6596E-11  1.1024E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -10.942006  -37.615438   -0.341038   -0.180629   -0.935115  2457270.577949
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:           17.40495 +/-     0.165
Argument of Peri:      234.97728 +/-     0.024
Long of Asc Node:      355.45964 +/-     0.003
Inclination:            19.37933 +/-     0.001
Eccentricity:         0.69750092 +/-    0.0024
Semi-Major Axis:    120.71587718 +/-    0.7474
Time of Perihelion: 2433848.9671 +/-      43.0
Perihelion:          36.51644221 +/-    0.3662
Aphelion:           204.91531216 +/-    1.3010
Period (y)             1326.3398 +/-     12.32
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           48.87129992 +/-    0.0056
Ecliptic Y          -37.22882805 +/-    0.0044
Ecliptic Z          -11.69333027 +/-    0.0014
Ecliptic XDOT         0.00254088 +/-    0.0000
Ecliptic YDOT         0.00067867 +/-    0.0000
Ecliptic ZDOT         0.00030872 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   62.53897638 +/-    0.0051
Geocenter to KBO     61.60511682 +/-    0.0073
# Hcoef:  6.72

The following table shows the complete astrometric record for 15RQ281. 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 (15RQ281) followed by the observatory code and reference code for the source of the astrometry.

2015 09  05.07716  21 54 29.370  -24 21 48.77  24.9r 15RQ281   807  C~31Lt      
2015 09  05.15157  21 54 29.124  -24 21 49.82  24.7r 15RQ281   807  C~31Lt      
2015 09  05.23067  21 54 28.862  -24 21 50.60  24.8r 15RQ281   807  C~31Lt      
2015 10  16.10458  21 52 40.213  -24 24 25.76        15RQ281   304  C~31Lt      
2015 10  16.17460  21 52 40.091  -24 24 25.48        15RQ281   304  C~31Lt      
2015 12  09.05774  21 52 42.031  -24 12 33.36  24.9r 15RQ281   304  C~31Lt      
2016 09  27.02253  21 55 55.553  -23 58 26.77  24.7r 15RQ281   304  C~31Lt      
2016 09  27.05572  21 55 55.456  -23 58 27.02  24.6r 15RQ281   304  C~31Lt      
2016 09  27.10315  21 55 55.330  -23 58 27.31  24.7r 15RQ281   304  C~31Lt      
2016 09  28.03454  21 55 52.925  -23 58 30.47  24.3r 15RQ281   304  C~31Lt      
2016 10  01.02910  21 55 45.332  -23 58 38.68  24.5r 15RQ281   304  C~31Lt      
2018 05  16.38925  22 05 51.400  -22 38 15.07  24.6r 15RQ281   304  C~31Lt      
2018 05  19.39354  22 05 53.214  -22 38 30.47  24.7r 15RQ281   304  C~31Lt      

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    -0.04       0.00    -0.17
     2   0.0002     -3.52    -0.04       0.18    -0.44
     3   0.0004     -7.15     0.07       0.68    -0.42
     4   0.1123  -1454.16    -0.10     366.15     0.43
     5   0.1125  -1455.63    -0.09     366.98     0.44
     6   0.2600  -1186.57     0.41    1026.87    -0.52
     7   1.0621   1592.77    -0.04     905.48     0.32
     8   1.0622   1591.44    -0.18     905.71     0.24
     9   1.0624   1589.72    -0.20     906.04     0.13
    10   1.0649   1557.72     0.16     914.56     0.10
    11   1.0731   1457.29    -0.03     943.09     0.33
    12   2.6949  10987.70     0.04    2477.67    -0.25
    13   2.7031  11005.52     0.04    2454.15    -0.19

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.

15RQ281    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj       120.487   122.592   118.478
ecceobj         0.695     0.701     0.688
incobj         19.299    19.299    19.298
qmin           35.308    35.298    35.525
qmax          218.185   220.683   209.964
amean         122.232   123.860   119.145
amin          119.033   120.856   116.209
amax          127.827   128.865   123.426
emean           0.698     0.705     0.688
emin            0.684     0.693     0.673
emax            0.712     0.716     0.702
imean          20.359    20.060    20.437
imin           19.392    19.705    19.427
imax           21.589    21.398    21.663
excite_mean     0.780     0.784     0.771
fracstop        1.000     1.000     1.000
cjmean          2.952     2.947     2.958

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       254.3     285.5     247.1
kozaiamp        180.0      56.7     180.0