Orbit Fit and Astrometric record for 17HQ108

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: 17HQ108   
# Created Tue Apr  1 01:11:07 2025
# Orbit generated from Bernstein formalism
# Fitting     50 observations of     50
# Arc:   4.79y
# First observation: 2013/04/03
#  Last observation: 2018/01/17
Preliminary a, adot, b, bdot, g, gdot:
  -0.002896   0.039724   0.000182  -0.003064   0.032537   0.000000
# Chi-squared of fit:    20.91 DOF:     94 RMS:  0.11
# Min/Max residuals:    -0.25    0.32
# Exact a, adot, b, bdot, g, gdot:
  2.018342E-05  3.730090E-02 -1.403219E-06 -2.875247E-03  2.942038E-02 -1.052208E-02
# Covariance matrix:
  1.1354E-12 -6.2289E-13 -4.1521E-14  3.5103E-14 -2.3873E-13 -2.1405E-12
 -6.2289E-13  4.3006E-13  3.2199E-14 -2.8415E-14  1.4556E-13  1.7482E-12
 -4.1521E-14  3.2199E-14  5.3145E-13 -1.5058E-13  1.7115E-14  1.4507E-13
  3.5103E-14 -2.8415E-14 -1.5058E-13  4.5857E-14 -1.1181E-14 -1.2853E-13
 -2.3873E-13  1.4556E-13  1.7115E-14 -1.1181E-14  2.0749E-13  6.3907E-13
 -2.1405E-12  1.7482E-12  1.4507E-13 -1.2853E-13  6.3907E-13  7.9140E-12
#      lat0       lon0       xBary       yBary       zBary        JD0
   -8.762471  143.515610   -0.765511   -0.098209   -0.637664  2456385.547693
# Heliocentric elements and errors
Epoch:              2456380.5000  =  2013/03/29
Mean Anomaly:          350.50133 +/-     0.003
Argument of Peri:      284.60699 +/-     0.010
Long of Asc Node:      260.55244 +/-     0.002
Inclination:             9.52968 +/-     0.000
Eccentricity:         0.57244029 +/-    0.0001
Semi-Major Axis:     74.09310219 +/-    0.0136
Time of Perihelion: 2462526.9643 +/-       1.2
Perihelion:          31.67922505 +/-    0.0085
Aphelion:           116.50697933 +/-    0.0222
Period (y)              637.7858 +/-      0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -27.98326815 +/-    0.0004
Ecliptic Y           19.74483748 +/-    0.0003
Ecliptic Z           -5.17806294 +/-    0.0001
Ecliptic XDOT        -0.00125942 +/-    0.0000
Ecliptic YDOT        -0.00339016 +/-    0.0000
Ecliptic ZDOT        -0.00011514 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   34.63718001 +/-    0.0004
Geocenter to KBO     33.99003911 +/-    0.0005
# Hcoef:  8.29

The following table shows the complete astrometric record for 17HQ108. 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 (17HQ108) followed by the observatory code and reference code for the source of the astrometry.

2013 04  03.046915 09 31 49.327  +05 23 35.77  21.5z 17HQ108   W84  C~8HLF      
2014 05  26.969084 09 39 37.572  +04 45 47.30  23.3r 17HQ108   W84  C~8HLF      
2016 01  15.610219 10 02 37.10   +02 10 56.1         17HQ108   T09  C~83FH      
2016 01  15.668933 10 02 36.85   +02 10 56.7         17HQ108   T09  C~83FH      
2016 02  05.299311 10 00 56.354  +02 16 59.88  21.7Y 17HQ108   W84  C~8HLF      
2016 03  07.27865  09 58 09.81   +02 31 40.8   24.5g 17HQ108   T09  C~89Up      
2016 03  07.28866  09 58 09.76   +02 31 41.0   24.6g 17HQ108   T09  C~89Up      
2016 03  07.29878  09 58 09.70   +02 31 41.5   24.6g 17HQ108   T09  C~89Up      
2016 03  07.31730  09 58 09.60   +02 31 41.8   24.1g 17HQ108   T09  C~89Up      
2016 03  07.32886  09 58 09.55   +02 31 42.5   24.6g 17HQ108   T09  C~89Up      
2016 03  09.28942  09 57 59.66   +02 32 44.9   23.7r 17HQ108   T09  C~89Up      
2016 03  09.29953  09 57 59.60   +02 32 45.2   23.7r 17HQ108   T09  C~89Up      
2016 03  09.30973  09 57 59.55   +02 32 45.4   23.9r 17HQ108   T09  C~89Up      
2016 03  09.32844  09 57 59.45   +02 32 46.1   23.9r 17HQ108   T09  C~89Up      
2016 03  09.33236  09 57 59.43   +02 32 46.2   24.0r 17HQ108   T09  C~89Up      
2016 03  09.33622  09 57 59.42   +02 32 46.4   24.3r 17HQ108   T09  C~89Up      
2016 03  10.200424 09 57 55.118  +02 33 14.08  22.8z 17HQ108   W84  C~8HLF      
2016 03  12.39109  09 57 44.34   +02 34 24.1   23.6z 17HQ108   T09  C~89Up      
2016 03  12.40577  09 57 44.27   +02 34 24.6   23.5z 17HQ108   T09  C~89Up      
2016 03  12.42050  09 57 44.20   +02 34 25.0   23.4z 17HQ108   T09  C~89Up      
2016 03  12.46618  09 57 43.96   +02 34 26.7   24.1z 17HQ108   T09  C~89Up      
2016 03  12.47390  09 57 43.93   +02 34 26.7   23.3z 17HQ108   T09  C~89Up      
2016 03  15.44832  09 57 29.74   +02 36 02.2   22.8y 17HQ108   T09  C~89Up      
2016 03  15.46258  09 57 29.68   +02 36 02.7   22.1y 17HQ108   T09  C~89Up      
2016 03  15.50659  09 57 29.45   +02 36 04.0   23.4y 17HQ108   T09  C~89Up      
2017 02  02.50623  10 09 36.68   +01 20 21.5   23.5r 17HQ108   T09  C~7xUY      
2017 02  02.51587  10 09 36.63   +01 20 22.1   23.4r 17HQ108   T09  C~7xUY      
2017 02  02.52702  10 09 36.59   +01 20 22.1   23.4r 17HQ108   T09  C~7xUY      
2017 02  02.59348  10 09 36.23   +01 20 23.6   23.1i 17HQ108   T09  C~7xUY      
2017 03  04.32155  10 06 55.62   +01 34 11.0   23.0z 17HQ108   T09  C~7xUY      
2017 03  04.34714  10 06 55.47   +01 34 11.9   23.0z 17HQ108   T09  C~7xUY      
2017 03  04.50300  10 06 54.62   +01 34 16.8   23.2i 17HQ108   T09  C~7xUY      
2017 03  22.39453  10 05 26.90   +01 44 03.4   23.1z 17HQ108   T09  C~7xUY      
2017 03  22.42021  10 05 26.79   +01 44 04.1   23.0z 17HQ108   T09  C~7xUY      
2017 03  22.44588  10 05 26.66   +01 44 05.1   22.9z 17HQ108   T09  C~7xUY      
2017 03  22.47157  10 05 26.55   +01 44 05.9   22.9z 17HQ108   T09  C~7xUY      
2017 03  22.49332  10 05 26.46   +01 44 06.4   23.0z 17HQ108   T09  C~7xUY      
2017 03  23.100325 10 05 23.803  +01 44 26.59  23.8V 17HQ108   W84  C~8HLF      
2017 03  24.117636 10 05 19.380  +01 44 59.82  23.1V 17HQ108   W84  C~8HLF      
2017 03  26.053480 10 05 11.182  +01 46 02.53  23.9V 17HQ108   W84  C~8HLF      
2017 04  26.23645  10 03 42.82   +02 00 44.2   23.7i 17HQ108   T09  C~7xUY      
2017 04  26.24028  10 03 42.82   +02 00 44.4   23.7i 17HQ108   T09  C~7xUY      
2017 04  26.24413  10 03 42.81   +02 00 44.7   23.6i 17HQ108   T09  C~7xUY      
2017 04  26.26326  10 03 42.79   +02 00 44.9   23.8i 17HQ108   T09  C~7xUY      
2017 04  26.29400  10 03 42.75   +02 00 45.4   23.6i 17HQ108   T09  C~7xUY      
2017 04  26.29783  10 03 42.74   +02 00 45.6   23.5i 17HQ108   T09  C~7xUY      
2017 04  26.32635  10 03 42.71   +02 00 46.1   24.4g 17HQ108   T09  C~7xUY      
2017 04  26.33018  10 03 42.70   +02 00 46.4   24.3g 17HQ108   T09  C~7xUY      
2017 04  26.33400  10 03 42.70   +02 00 46.4   24.3g 17HQ108   T09  C~7xUZ      
2018 01  17.632758 10 19 29.21   +00 19 06.3         17HQ108   T09  C~83FH      

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    -0.03       0.00    -0.03
     2   1.1469   7356.94     0.12     110.56     0.17
     3   2.7859  30122.48     0.04   -1925.61    -0.05
     4   2.7861  30118.67     0.16   -1926.29    -0.09
     5   2.8426  28545.67    -0.01   -2080.16    -0.03
     6   2.9274  25852.64    -0.07   -2067.69     0.07
     7   2.9274  25851.85    -0.00   -2067.75    -0.04
     8   2.9275  25850.82    -0.17   -2067.57     0.10
     9   2.9275  25849.28    -0.13   -2067.78    -0.20
    10   2.9275  25848.33    -0.10   -2067.36     0.17
    11   2.9329  25685.33     0.04   -2056.97     0.08
    12   2.9329  25684.37    -0.07   -2056.98     0.01
    13   2.9330  25683.58     0.00   -2057.04    -0.10
    14   2.9330  25681.91    -0.10   -2056.87    -0.02
    15   2.9330  25681.59    -0.09   -2056.87    -0.05
    16   2.9330  25681.38     0.02   -2056.73     0.07
    17   2.9354  25610.31     0.32   -2051.70    -0.02
    18   2.9414  25432.06    -0.02   -2038.45    -0.08
    19   2.9414  25430.88     0.01   -2038.32    -0.04
    20   2.9415  25429.74     0.08   -2038.28    -0.09
    21   2.9416  25425.73    -0.20   -2037.85     0.06
    22   2.9416  25425.30     0.00   -2038.00    -0.13
    23   2.9498  25189.57     0.01   -2017.40     0.01
    24   2.9498  25188.54     0.11   -2017.22     0.09
    25   2.9499  25184.80    -0.15   -2017.12    -0.11
    26   3.8370  37249.12    -0.05   -2730.81    -0.16
    27   3.8370  37248.19    -0.17   -2730.49     0.22
    28   3.8370  37247.60     0.19   -2730.69     0.08
    29   3.8372  37241.83     0.04   -2731.06     0.09
    30   3.9186  34617.83     0.08   -2742.68     0.13
    31   3.9187  34615.34    -0.12   -2742.57     0.14
    32   3.9191  34601.31    -0.23   -2742.13    -0.01
    33   3.9681  33127.22     0.06   -2619.22     0.12
    34   3.9682  33125.39     0.19   -2619.10     0.02
    35   3.9682  33123.16    -0.07   -2618.79     0.10
    36   3.9683  33121.29     0.03   -2618.58     0.09
    37   3.9684  33119.82     0.21   -2618.55    -0.07
    38   3.9700  33074.40     0.14   -2612.51     0.03
    39   3.9728  32998.93     0.10   -2602.81     0.06
    40   3.9781  32858.70     0.28   -2583.78    -0.01
    41   4.0635  31279.60    -0.15   -2182.15    -0.16
    42   4.0635  31279.54    -0.11   -2181.96    -0.02
    43   4.0635  31279.29    -0.25   -2181.72     0.16
    44   4.0636  31278.93    -0.07   -2181.63    -0.02
    45   4.0636  31278.19     0.04   -2181.35    -0.19
    46   4.0637  31277.97    -0.06   -2181.21    -0.10
    47   4.0637  31277.37     0.13   -2180.88    -0.19
    48   4.0637  31277.12    -0.01   -2180.64    -0.00
    49   4.0638  31277.12     0.10   -2180.64    -0.06
    50   4.7928  47257.81    -0.08   -3284.84     0.01

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.

17HQ108    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        73.450    73.482    73.418
ecceobj         0.568     0.568     0.568
incobj          9.523     9.523     9.523
qmin           30.508    30.775    30.769
qmax          125.690   119.419   119.625
amean          73.122    67.416    70.217
amin           64.643    62.693    63.649
amax           78.906    75.536    75.893
emean           0.563     0.522     0.544
emin            0.502     0.480     0.494
emax            0.595     0.581     0.578
imean          11.971    12.888    12.132
imin            9.764    10.664    10.120
imax           13.731    14.981    14.026
excite_mean     0.600     0.568     0.583
fracstop        1.000     1.000     1.000
cjmean          2.930     2.932     2.933

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       181.4     178.7     173.0
kozaiamp        180.0     180.0     180.0