Orbit Fit and Astrometric record for 17DH163

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: 17DH163   
# Created Thu Oct 31 01:10:33 2024
# Orbit generated from Bernstein formalism
# Fitting     57 observations of     58
# Arc:   2.11y
# First observation: 2016/12/25
#  Last observation: 2019/02/05
Preliminary a, adot, b, bdot, g, gdot:
   0.000004   0.027759  -0.000003   0.010918   0.027178   0.000000
# Chi-squared of fit:    31.09 DOF:    108 RMS:  0.13
# Min/Max residuals:    -0.46    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.591624E-05  2.737411E-02  5.303780E-06  1.076664E-02  2.686159E-02 -1.355358E-03
# Covariance matrix:
  7.0047E-14 -4.5036E-14  5.3738E-15 -1.1494E-14  8.0937E-14 -6.3102E-13
 -4.5036E-14  2.5338E-12 -7.6638E-14  1.1159E-12  6.4842E-13  5.6396E-11
  5.3738E-15 -7.6638E-14  3.4187E-14 -6.5598E-14 -1.0146E-14 -1.8439E-12
 -1.1494E-14  1.1159E-12 -6.5598E-14  6.7033E-13  2.9426E-13  2.6404E-11
  8.0937E-14  6.4842E-13 -1.0146E-14  2.9426E-13  3.6331E-13  1.4762E-11
 -6.3102E-13  5.6396E-11 -1.8439E-12  2.6404E-11  1.4762E-11  1.3348E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -10.077722  151.754361    0.837664   -0.091220   -0.514383  2457748.016489
# Heliocentric elements and errors
Epoch:              2457740.5000  =  2016/12/18
Mean Anomaly:          340.21277 +/-     0.311
Argument of Peri:        1.91760 +/-     0.455
Long of Asc Node:      174.42014 +/-     0.001
Inclination:            23.34339 +/-     0.001
Eccentricity:         0.16638599 +/-    0.0005
Semi-Major Axis:     44.54583821 +/-    0.0053
Time of Perihelion: 2463709.3637 +/-      93.7
Perihelion:          37.13403480 +/-    0.0245
Aphelion:            51.95764162 +/-    0.0249
Period (y)              297.3164 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -32.35653799 +/-    0.0007
Ecliptic Y           18.32711835 +/-    0.0004
Ecliptic Z           -6.51412457 +/-    0.0001
Ecliptic XDOT        -0.00136720 +/-    0.0000
Ecliptic YDOT        -0.00243807 +/-    0.0000
Ecliptic ZDOT         0.00110457 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.75265073 +/-    0.0006
Geocenter to KBO     37.22787708 +/-    0.0008
# Hcoef:  9.39

The following table shows the complete astrometric record for 17DH163. 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 (17DH163) followed by the observatory code and reference code for the source of the astrometry.

2016 12  25.51570  10 00 43.48   +01 25 15.9   26.2r 17DH163   T09  C~7zpo      
2016 12  25.54616  10 00 43.39   +01 25 15.7   26.0r 17DH163   T09  C~7zpo      
2016 12  25.57937  10 00 43.32   +01 25 15.9   25.5i 17DH163   T09  C~7zpo      
2016 12  25.59037  10 00 43.26   +01 25 16.2   26.0i 17DH163   T09  C~7zpo      
2017 01  02.43400  10 00 21.31   +01 26 16.0   24.7z 17DH163   T09  C~7zpo      
2017 01  02.49315  10 00 21.13   +01 26 16.2   25.1i 17DH163   T09  C~7zpo      
2017 01  02.50080  10 00 21.10   +01 26 16.5   25.0i 17DH163   T09  C~7zpo      
2017 01  02.50463  10 00 21.10   +01 26 16.2   24.9i 17DH163   T09  C~7zpo      
2017 01  02.51228  10 00 21.07   +01 26 16.5   25.1i 17DH163   T09  C~7zpo      
2017 01  02.58611  10 00 20.82   +01 26 17.3   25.9g 17DH163   T09  C~7zpo      
2017 01  02.59458  10 00 20.80   +01 26 17.2   25.5g 17DH163   T09  C~7zpo      
2017 01  02.60039  10 00 20.78   +01 26 17.4   25.8g 17DH163   T09  C~7zpo      
2017 01  02.60880  10 00 20.77   +01 26 17.5   26.0g 17DH163   T09  C~7zpo      
2017 01  02.62292  10 00 20.68   +01 26 17.7   25.5g 17DH163   T09  C~7zpo      
2017 01  21.41782  09 59 09.50   +01 31 19.5   25.0z 17DH163   T09  C~7zpo      
2017 01  21.43628  09 59 09.42   +01 31 20.2   24.7z 17DH163   T09  C~7zpo      
2017 01  21.49330  09 59 09.16   +01 31 21.0   24.6z 17DH163   T09  C~7zpo      
2017 01  21.49713  09 59 09.15   +01 31 21.4   24.6z 17DH163   T09  C~7zpo      
2017 01  21.50822  09 59 09.11   +01 31 21.4   24.5z 17DH163   T09  C~7zpo      
2017 01  21.51563  09 59 09.08   +01 31 21.5   24.5z 17DH163   T09  C~7zpo      
2017 01  21.51947  09 59 09.05   +01 31 21.9   24.6z 17DH163   T09  C~7zpo      
2017 01  21.53429  09 59 08.99   +01 31 22.2   24.1z 17DH163   T09  C~7zpo      
2017 01  23.36023  09 59 00.95   +01 32 02.4   25.2r 17DH163   T09  C~7zpo      
2017 01  23.37416  09 59 00.91   +01 32 02.9   24.6r 17DH163   T09  C~7zpo      
2017 01  23.43372  09 59 00.63   +01 32 04.0   25.3r 17DH163   T09  C~7zpo      
2017 01  23.44310  09 59 00.58   +01 32 04.4   25.1r 17DH163   T09  C~7zpo      
2017 01  23.48266  09 59 00.41   +01 32 05.2   25.0i 17DH163   T09  C~7zpo      
2017 01  23.50215  09 59 00.31   +01 32 05.9   25.0i 17DH163   T09  C~7zpo      
2017 01  23.51704  09 59 00.26   +01 32 06.2   25.4i 17DH163   T09  C~7zpo      
2017 01  23.52648  09 59 00.21   +01 32 06.2   25.0i 17DH163   T09  C~7zpo      
2017 01  23.53190  09 59 00.19   +01 32 06.2   25.0i 17DH163   T09  C~7zpo      
2017 01  23.59562  09 58 59.89   +01 32 07.9   24.8i 17DH163   T09  C~7zpo      
2017 01  30.41352  09 58 28.55   +01 34 54.9   24.4i 17DH163   T09  C~7zpo      
2017 01  30.43553  09 58 28.45   +01 34 55.7   25.3i 17DH163   T09  C~7zpo      
2017 01  30.52778  09 58 28.00   +01 34 58.1   24.7z 17DH163   T09  C~7zpo      
2017 01  30.56478  09 58 27.82   +01 34 59.2   24.8z 17DH163   T09  C~7zpo      
2017 01  30.59058  09 58 27.70   +01 34 59.9   24.4z 17DH163   T09  C~7zpo      
2017 02  02.42933  09 58 14.16   +01 36 16.6   25.2r 17DH163   T09  C~7zpo      
2017 02  02.43804  09 58 14.11   +01 36 16.8   25.2r 17DH163   T09  C~7zpo      
2017 02  02.46755  09 58 13.96   +01 36 17.6   25.3r 17DH163   T09  C~7zpo      
2017 02  21.34959  09 56 40.51   +01 46 10.4   24.6z 17DH163   T09  C~7zpo      
2017 02  21.37516  09 56 40.36   +01 46 11.2   24.8z 17DH163   T09  C~7zpo      
2017 02  21.40083  09 56 40.22   +01 46 12.0   24.1z 17DH163   T09  C~7zpo      
2017 02  23.31993  09 56 30.70   +01 47 18.6   26.0g 17DH163   T09  C~7zpo      
2017 02  23.46720  09 56 29.95   +01 47 23.8   25.1r 17DH163   T09  C~7zpo      
2017 02  23.49450  09 56 29.82   +01 47 24.8   25.4r 17DH163   T09  C~7zpo      
2017 02  23.51193  09 56 29.74   +01 47 25.3   25.3r 17DH163   T09  C~7zpo      
2017 03  04.29255  09 55 47.12   +01 52 40.2   24.3z 17DH163   T09  C~7zpo      
2017 03  04.31803  09 55 47.02   +01 52 41.4   24.4z 17DH163   T09  C~7zpo      
2017 03  04.45601  09 55 46.33   +01 52 46.3   25.0i 17DH163   T09  C~7zpo      
2017 03  04.47782  09 55 46.21   +01 52 47.3   25.1i 17DH163   T09  C~7zpo      
2017 03  22.25015  09 54 28.84   +02 03 46.5   25.7g 17DH163   T09  C~7zpo      
2017 03  22.32046  09 54 28.57   +02 03 48.9   25.5g 17DH163   T09  C~7zpo      
2017 03  22.33527  09 54 28.51   +02 03 49.7   26.0g 17DH163   T09  C~7zpo      
2018 01  17.518288 10 06 15.77   +01 31 29.8         17DH163   T09  C~81Bu      
2018 01  17.545345 10 06 15.66   +01 31 30.2         17DH163   T09  C~81Bu      
2019 02  05.422693 10 11 43.35   +01 40 37.4         17DH163   T09  C~81Bu      
2019 02  05.425366 10 11 43.33   +01 40 37.4         17DH163   T09  C~81Bu      

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     0.21
     2   0.0001     -1.19    -0.01      -0.66    -0.18
     3   0.0002     -2.25     0.19      -0.84    -0.07
     4   0.0002     -3.19    -0.34      -0.88    -0.01
     5   0.0217   -332.42    -0.23     -60.24     0.25
     6   0.0218   -335.02     0.05     -60.99    -0.08
     7   0.0219   -335.55    -0.11     -60.87     0.10
     8   0.0219   -335.44     0.18     -61.15    -0.15
     9   0.0219   -335.97     0.03     -61.03     0.03
    10   0.0221   -339.76    -0.15     -61.59     0.01
    11   0.0221   -340.01     0.02     -61.79    -0.13
    12   0.0221   -340.36    -0.05     -61.71    -0.00
    13   0.0222   -340.53     0.19     -61.67     0.10
    14   0.0222   -341.87    -0.46     -61.95    -0.08
    15   0.0737  -1447.31    -0.03    -153.31    -0.04
    16   0.0737  -1448.68    -0.11    -153.08     0.25
    17   0.0739  -1452.61    -0.05    -153.69    -0.19
    18   0.0739  -1452.89    -0.06    -153.37     0.15
    19   0.0739  -1453.46     0.15    -153.58    -0.03
    20   0.0739  -1453.91     0.22    -153.64    -0.07
    21   0.0739  -1454.47    -0.07    -153.43     0.16
    22   0.0740  -1455.42     0.02    -153.46     0.17
    23   0.0790  -1582.43    -0.11    -158.05    -0.13
    24   0.0790  -1583.17     0.14    -157.79     0.16
    25   0.0792  -1587.48     0.08    -158.23    -0.13
    26   0.0792  -1588.33    -0.09    -158.12     0.01
    27   0.0793  -1590.99     0.08    -158.26    -0.04
    28   0.0794  -1592.64    -0.17    -158.13     0.15
    29   0.0794  -1593.45     0.10    -158.11     0.20
    30   0.0794  -1594.15     0.07    -158.38    -0.04
    31   0.0794  -1594.43     0.18    -158.48    -0.13
    32   0.0796  -1599.24    -0.06    -158.46     0.05
    33   0.0983  -2097.93     0.12    -166.67    -0.27
    34   0.0983  -2099.62     0.13    -166.44    -0.03
    35   0.0986  -2106.78     0.07    -166.56    -0.09
    36   0.0987  -2109.69    -0.00    -166.47     0.02
    37   0.0988  -2111.62     0.05    -166.45     0.06
    38   0.1065  -2328.68     0.09    -165.72     0.08
    39   0.1066  -2329.45     0.00    -165.79     0.00
    40   0.1066  -2331.84    -0.06    -165.83    -0.04
    41   0.1583  -3852.19 (   0.42)   -101.18 (   0.34)
    42   0.1584  -3854.58     0.16    -101.22     0.16
    43   0.1585  -3856.83     0.05    -101.21     0.03
    44   0.1637  -4013.90    -0.02     -88.78    -0.05
    45   0.1641  -4026.26    -0.15     -87.85    -0.05
    46   0.1642  -4028.43    -0.06     -87.59     0.03
    47   0.1643  -4029.73     0.08     -87.54    -0.03
    48   0.1883  -4738.82     0.11     -16.18    -0.21
    49   0.1884  -4740.65     0.33     -15.58     0.16
    50   0.1887  -4752.06     0.05     -14.61    -0.10
    51   0.1888  -4754.10    -0.23     -14.30     0.01
    52   0.2375  -6072.20    -0.24     197.56    -0.05
    53   0.2377  -6076.83    -0.04     198.39    -0.19
    54   0.2377  -6077.95    -0.14     198.83     0.04
    55   1.0623   4535.76     0.02    2098.52     0.03
    56   1.0624   4534.07     0.08    2098.31    -0.08
    57   2.1134   8947.86     0.01    4340.23     0.08
    58   2.1134   8947.58    -0.06    4340.13    -0.03

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.

17DH163    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        44.361    44.381    44.343
ecceobj         0.160     0.160     0.161
incobj         23.420    23.418    23.421
qmin           35.893    35.936    36.003
qmax           53.114    53.105    53.058
amean          44.353    44.371    44.309
amin           43.985    43.999    43.926
amax           44.783    44.789    44.739
emean           0.170     0.170     0.167
emin            0.154     0.153     0.150
emax            0.187     0.187     0.186
imean          22.782    22.780    22.872
imin           22.254    22.247    22.470
imax           23.293    23.294    23.344
excite_mean     0.423     0.423     0.423
fracstop        1.000     1.000     1.000
cjmean          2.885     2.885     2.884

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       168.6     168.7     169.6
kozaiamp        180.0     180.0     180.0