Orbit Fit and Astrometric record for 17DN121

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: 17DN121   
# Created Wed Dec  8 02:14:03 2021
# Orbit generated from Bernstein formalism
# Fitting     14 observations of     15
# Arc:   4.11y
# First observation: 2016/01/08
#  Last observation: 2020/02/18
Preliminary a, adot, b, bdot, g, gdot:
   0.000005   0.030834   0.000030  -0.006616   0.027684   0.000000
# Chi-squared of fit:    25.12 DOF:     22 RMS:  0.24
# Min/Max residuals:    -0.65    0.47
# Exact a, adot, b, bdot, g, gdot:
  1.687397E-05  3.078887E-02 -3.513586E-06 -6.609041E-03  2.760229E-02  1.631038E-03
# Covariance matrix:
  6.7100E-13 -3.7924E-13 -3.8107E-14  5.9378E-14  1.6213E-13 -2.2702E-12
 -3.7924E-13  8.8452E-13  1.2648E-13 -1.8673E-13  7.9626E-13  6.7848E-12
 -3.8107E-14  1.2648E-13  4.0997E-13 -1.6892E-13  1.2154E-13  1.0532E-12
  5.9378E-14 -1.8673E-13 -1.6892E-13  1.1147E-13 -1.7357E-13 -1.5590E-12
  1.6213E-13  7.9626E-13  1.2154E-13 -1.7357E-13  1.5209E-12  6.0945E-12
 -2.2702E-12  6.7848E-12  1.0532E-12 -1.5590E-12  6.0945E-12  5.6795E-11
#      lat0       lon0       xBary       yBary       zBary        JD0
    9.668858  136.231296    0.480094    0.144415   -0.846321  2457395.842982
# Heliocentric elements and errors
Epoch:              2457390.5000  =  2016/01/03
Mean Anomaly:            7.11650 +/-     0.043
Argument of Peri:      129.44604 +/-     0.071
Long of Asc Node:      353.29617 +/-     0.001
Inclination:            15.18134 +/-     0.000
Eccentricity:         0.23281718 +/-    0.0001
Semi-Major Axis:     48.14160102 +/-    0.0092
Time of Perihelion: 2454978.6910 +/-      14.4
Perihelion:          36.93340924 +/-    0.0092
Aphelion:            59.34979280 +/-    0.0128
Period (y)              334.0327 +/-      0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -26.08269273 +/-    0.0011
Ecliptic Y           25.64400737 +/-    0.0011
Ecliptic Z            6.08458542 +/-    0.0003
Ecliptic XDOT        -0.00230801 +/-    0.0000
Ecliptic YDOT        -0.00202579 +/-    0.0000
Ecliptic ZDOT        -0.00061904 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.08023939 +/-    0.0011
Geocenter to KBO     36.22888216 +/-    0.0016
# Hcoef:  7.35

The following table shows the complete astrometric record for 17DN121. 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 (17DN121) followed by the observatory code and reference code for the source of the astrometry.

2016 01  08.342193 09 27 28.13   +25 10 21.6         17DN121   W84  C~3k4S      
2016 01  08.343964 09 27 28.12   +25 10 21.6         17DN121   W84  C~3k4S      
2017 02  24.30916  09 29 55.080  +24 33 16.57  23.0r 17DN121   568  C~2b80      
2017 02  24.47569  09 29 54.123  +24 33 19.09  23.0r 17DN121   568  C~2b80      
2017 04  20.17337  09 26 31.424  +24 34 58.60        17DN121   G37  C~2b80      
2017 04  20.23129  09 26 31.335  +24 34 57.32        17DN121   G37  C~2b81      
2018 02  06.23890  09 38 24.661  +23 30 50.06        17DN121   G37  C~2b81      
2018 02  06.24656  09 38 24.586  +23 30 50.24        17DN121   G37  C~2b81      
2018 02  06.28755  09 38 24.337  +23 30 51.39        17DN121   G37  C~2b81      
2018 03  07.16145  09 35 43.935  +23 39 58.87        17DN121   G37  C~2b81      
2018 03  07.28767  09 35 43.304  +23 40 00.53        17DN121   G37  C~2b81      
2019 02  08.335600 09 44 51.379  +22 34 24.21  22.9G 17DN121   G37  C~2zme      
2019 02  08.474220 09 44 50.600  +22 34 27.52        17DN121   G37  C~2zme      
2020 02  18.173230 09 50 27.696  +21 40 17.18  22.6G 17DN121   G37  C~3k4S      
2020 02  18.223600 09 50 27.423  +21 40 18.21        17DN121   G37  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     0.16       0.00    -0.06
     2   0.0000     -0.13     0.15      -0.04    -0.11
     3   1.1306   2606.23    -0.48   -1469.44     0.21
     4   1.1311   2593.06    -0.65   -1471.26    -0.06
     5   1.2809    -59.90 (   0.32)  -2258.19 (   0.89)
     6   1.2810    -60.65     0.27   -2259.78     0.37
     7   2.0805  10440.26     0.47   -2713.71     0.04
     8   2.0805  10439.23     0.07   -2713.89    -0.10
     9   2.0806  10435.61    -0.14   -2713.96    -0.01
    10   2.1597   8169.59     0.08   -2933.33    -0.25
    11   2.1600   8160.85     0.38   -2934.64    -0.11
    12   3.0855  16641.69    -0.29   -4081.65    -0.02
    13   3.0859  16630.35    -0.08   -4082.28     0.04
    14   4.1118  22209.21    -0.08   -5496.50     0.05
    15   4.1119  22205.24     0.14   -5496.89     0.00

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.

17DN121    quality flag:3

Type:           2:1E      2:1E      2:1E

axisobj        48.022    48.049    47.995
ecceobj         0.231     0.231     0.230
incobj         15.217    15.217    15.217
qmin           35.629    36.381    35.147
qmax           60.654    60.095    60.909
amean          47.795    47.795    47.795
amin           47.197    47.192    47.206
amax           48.489    48.497    48.484
emean           0.220     0.219     0.217
emin            0.192     0.198     0.177
emax            0.253     0.240     0.261
imean          15.749    16.102    15.771
imin           14.716    15.689    13.464
imax           16.422    16.597    16.838
excite_mean     0.350     0.353     0.348
fracstop        1.000     1.000     1.000
cjmean          2.995     2.992     2.996

libcent 0       180.6     179.4     175.4
libamp  0       150.7     152.3     144.6
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       196.0     186.7     192.0
kozaiamp        180.0     180.0     180.0