Orbit Fit and Astrometric record for 17DP121

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: 17DP121   
# Created Sat Dec  4 02:13:59 2021
# Orbit generated from Bernstein formalism
# Fitting     12 observations of     12
# Arc:   1.06y
# First observation: 2017/02/24
#  Last observation: 2018/03/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.000010   0.011999   0.000000   0.002138   0.016776   0.000000
# Chi-squared of fit:    11.07 DOF:     18 RMS:  0.17
# Min/Max residuals:    -0.45    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.067231E-05  1.206516E-02  1.810568E-06  2.153303E-03  1.686202E-02  7.068684E-03
# Covariance matrix:
  6.7660E-13  1.1569E-12 -1.1588E-14  4.2120E-13  1.4823E-12  1.8148E-10
  1.1569E-12  4.8328E-11 -7.3499E-13  1.3486E-11  2.1379E-11  5.6399E-09
 -1.1588E-14 -7.3499E-13  2.9666E-13 -4.9666E-13 -3.0309E-13 -8.6374E-11
  4.2120E-13  1.3486E-11 -4.9666E-13  4.3243E-12  6.0621E-12  1.5913E-09
  1.4823E-12  2.1379E-11 -3.0309E-13  6.0621E-12  1.1567E-11  2.5481E-09
  1.8148E-10  5.6399E-09 -8.6374E-11  1.5913E-09  2.5481E-09  6.6568E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    9.814144  166.265604    0.186218    0.165660   -0.956703  2457808.881771
# Heliocentric elements and errors
Epoch:              2457800.5000  =  2017/02/16
Mean Anomaly:           52.84863 +/-     6.274
Argument of Peri:      291.95886 +/-     2.374
Long of Asc Node:      123.13224 +/-     0.034
Inclination:            14.01904 +/-     0.009
Eccentricity:         0.49859366 +/-    0.0499
Semi-Major Axis:     65.30952087 +/-    4.3785
Time of Perihelion: 2429499.9785 +/-    1785.6
Perihelion:          32.74660767 +/-    3.9268
Aphelion:            97.87243407 +/-    7.3249
Period (y)              527.8043 +/-     53.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -57.66841749 +/-    0.0114
Ecliptic Y           14.28068488 +/-    0.0028
Ecliptic Z           10.10877454 +/-    0.0020
Ecliptic XDOT        -0.00150265 +/-    0.0001
Ecliptic YDOT        -0.00165528 +/-    0.0000
Ecliptic ZDOT         0.00054008 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   60.26418223 +/-    0.0110
Geocenter to KBO     59.30487046 +/-    0.0120
# Hcoef:  7.17

The following table shows the complete astrometric record for 17DP121. 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 (17DP121) followed by the observatory code and reference code for the source of the astrometry.

2017 02  24.38097  11 25 06.820  +14 26 41.05  24.9r 17DP121   568  C~2b81      
2017 02  24.58347  11 25 06.150  +14 26 45.85  24.9r 17DP121   568  C~2b81      
2017 03  24.13050  11 23 34.948  +14 36 43.90        17DP121   304  C~2b81      
2017 03  24.20413  11 23 34.735  +14 36 45.37        17DP121   304  C~2b81      
2017 04  20.19888  11 22 16.460  +14 43 05.37        17DP121   G37  C~2b81      
2017 04  20.27973  11 22 16.268  +14 43 05.91        17DP121   G37  C~2b81      
2018 03  11.20256  11 27 07.478  +14 22 29.36  24.8r 17DP121   304  C~2b81      
2018 03  11.27240  11 27 07.243  +14 22 30.67        17DP121   304  C~2b81      
2018 03  12.18093  11 27 04.219  +14 22 50.42        17DP121   304  C~2b81      
2018 03  12.25842  11 27 03.971  +14 22 52.22        17DP121   304  C~2b81      
2018 03  17.206690 11 26 47.54   +14 24 36.7         17DP121   W84  C~3k4S      
2018 03  17.208559 11 26 47.52   +14 24 37.0         17DP121   W84  C~3k4S      

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     0.13       0.00     0.04
     2   0.0006    -10.84     0.07       0.52    -0.02
     3   0.0760  -1463.77    -0.45      21.71     0.05
     4   0.0762  -1467.19    -0.09      21.83     0.32
     5   0.1501  -2660.72     0.07     -80.11    -0.15
     6   0.1503  -2663.49     0.27     -80.72    -0.27
     7   1.0399   1707.30     0.00     470.54     0.06
     8   1.0401   1703.64     0.10     470.37    -0.12
     9   1.0426   1655.47    -0.01     470.85    -0.17
    10   1.0428   1651.45     0.13     471.05     0.03
    11   1.0563   1390.84     0.03     471.08     0.04
    12   1.0563   1390.46    -0.26     471.24     0.20

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.

17DP121    quality flag:1

Type:       SCATNEAR  CENTAURR  SCATNEAR

axisobj        65.144    83.487    56.129
ecceobj         0.504     0.644     0.372
incobj         14.026    14.051    14.000
qmin           31.677    29.042    34.588
qmax          106.975   158.641    79.638
amean          67.187    82.742    56.278
amin           62.984    74.024    55.495
amax           70.235    94.636    57.406
emean           0.505     0.632     0.369
emin            0.471     0.577     0.354
emax            0.529     0.681     0.387
imean          14.417    14.647    12.961
imin           11.869    12.278    11.988
imax           16.438    17.257    13.697
excite_mean     0.564     0.681     0.432
fracstop        1.000     0.949     1.000
cjmean          2.944     2.847     3.012

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       188.3     169.3     181.9
kozaiamp        180.0     180.0     180.0