Orbit Fit and Astrometric record for 17WH30

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: 17WH30    
# Created Sat Nov 27 02:14:08 2021
# Orbit generated from Bernstein formalism
# Fitting     26 observations of     28
# Arc:   3.97y
# First observation: 2017/11/17
#  Last observation: 2021/11/05
Preliminary a, adot, b, bdot, g, gdot:
  -0.000149   0.013231   0.000024  -0.002833   0.016771   0.000000
# Chi-squared of fit:    23.34 DOF:     46 RMS:  0.17
# Min/Max residuals:    -0.50    0.42
# Exact a, adot, b, bdot, g, gdot:
  8.291712E-06  1.273335E-02 -3.586392E-06 -2.736871E-03  1.693933E-02 -8.736311E-03
# Covariance matrix:
  1.8135E-13 -2.0291E-13 -1.7180E-14  3.2144E-14  1.0235E-13 -2.7288E-12
 -2.0291E-13  6.2134E-13  3.3355E-14 -1.1547E-13  8.0625E-15  1.0380E-11
 -1.7180E-14  3.3355E-14  8.3141E-14 -3.5842E-14 -1.4880E-14  5.4104E-13
  3.2144E-14 -1.1547E-13 -3.5842E-14  5.9363E-14 -5.9664E-15 -2.0639E-12
  1.0235E-13  8.0625E-15 -1.4880E-14 -5.9664E-15  2.2040E-13  8.7473E-13
 -2.7288E-12  1.0380E-11  5.4104E-13 -2.0639E-12  8.7473E-13  1.8666E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -13.785237   68.596864    0.234809   -0.230141   -0.938847  2458074.760181
# Heliocentric elements and errors
Epoch:              2458070.5000  =  2017/11/13
Mean Anomaly:          329.79103 +/-     0.080
Argument of Peri:      329.56518 +/-     0.011
Long of Asc Node:      200.87507 +/-     0.002
Inclination:            18.12567 +/-     0.001
Eccentricity:         0.61440781 +/-    0.0009
Semi-Major Axis:     85.42018880 +/-    0.1442
Time of Perihelion: 2482268.1223 +/-      19.6
Perihelion:          32.93735771 +/-    0.0954
Aphelion:           137.90301989 +/-    0.2454
Period (y)              789.4943 +/-      2.00
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           21.49152930 +/-    0.0006
Ecliptic Y           54.18833250 +/-    0.0015
Ecliptic Z          -14.06714346 +/-    0.0004
Ecliptic XDOT        -0.00244954 +/-    0.0000
Ecliptic YDOT        -0.00062919 +/-    0.0000
Ecliptic ZDOT        -0.00009328 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   59.96787254 +/-    0.0014
Geocenter to KBO     59.03422365 +/-    0.0016
# Hcoef:  6.68

The following table shows the complete astrometric record for 17WH30. 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 (17WH30) followed by the observatory code and reference code for the source of the astrometry.

2017 11  17.25938  04 36 05.483  +08 06 32.39  24.3r 17WH30    807  C~2yg0      
2017 11  17.25939  04 36 05.44   +08 06 32.2   25.0V 17WH30    W84  C~30Lu      
2017 11  17.26470  04 36 05.417  +08 06 32.07  24.3r 17WH30    807  C~2yg0      
2017 11  18.24579  04 36 02.06   +08 06 20.1         17WH30    W84  C~30Lu      
2017 11  18.25191  04 36 02.015  +08 06 19.95  24.4r 17WH30    807  C~2yg0      
2017 11  18.26354  04 36 02.030  +08 06 19.87  24.3r 17WH30    807  C~2yg0      
2017 11  18.26355  04 36 01.99   +08 06 19.8         17WH30    W84  C~30Lu      
2017 11  21.21549  04 35 51.766  +08 05 44.59  24.2r 17WH30    304  C~2yg0      
2017 11  22.22533  04 35 48.227  +08 05 33.02  24.3r 17WH30    304  C~2yg0      
2017 12  13.14260  04 34 34.012  +08 02 28.95  24.3r 17WH30    304  C~2yg0      
2017 12  14.12789  04 34 30.549  +08 02 22.98  24.2r 17WH30    304  C~2yg0      
2018 02  06.11806  04 32 14.123  +08 04 11.99        17WH30    G37  C~2yg0      
2018 02  06.17380  04 32 14.045  +08 04 12.52        17WH30    G37  C~2yg0      
2018 02  06.22865  04 32 13.950  +08 04 13.31  24.3R 17WH30    G37  C~2yg0      
2018 03  07.12209  04 32 10.567  +08 10 06.78        17WH30    G37  C~2yg0      
2018 03  07.12961  04 32 10.569  +08 10 06.76        17WH30    G37  C~2yg0      
2018 03  07.20150  04 32 10.629  +08 10 07.78        17WH30    G37  C~2yg0      
2018 03  07.20878  04 32 10.638  +08 10 07.83        17WH30    G37  C~2yg0      
2018 03  07.21618  04 32 10.646  +08 10 07.90        17WH30    G37  C~2yg0      
2018 11  09.31532  04 39 34.229  +08 05 20.69        17WH30    G37  C~2yg0      
2018 11  09.32369  04 39 34.220  +08 05 20.53        17WH30    G37  C~2yg0      
2018 11  09.38665  04 39 34.050  +08 05 19.94        17WH30    G37  C~2yg0      
2018 11  09.39503  04 39 33.994  +08 05 19.99        17WH30    G37  C~2yg0      
2018 12  08.20804  04 37 53.251  +08 00 04.41  24.3r 17WH30    304  C~2yg0      
2018 12  08.25798  04 37 53.076  +08 00 03.88        17WH30    304  C~2yg0      
2021 11  05.412690 04 49 10.419  +07 56 32.32  24.1G 17WH30    G37  C~5BiB      
2021 11  05.454110 04 49 10.284  +07 56 31.69        17WH30    G37  C~5BiB      
2021 11  05.495790 04 49 10.164  +07 56 31.10        17WH30    G37  C~5BiB      

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 (   0.74)      0.00 (   0.21)
     2   0.0000     -0.66     0.08      -0.09     0.12
     3   0.0000     -1.02     0.01      -0.17     0.07
     4   0.0027    -52.08     0.14      -4.70     0.15
     5   0.0027    -52.77    -0.22      -4.75     0.12
     6   0.0027    -52.56 (   0.61)     -4.87 (   0.06)
     7   0.0027    -53.16     0.01      -4.85     0.08
     8   0.0108   -208.51     0.06     -17.40    -0.04
     9   0.0136   -262.19    -0.04     -21.13    -0.02
    10   0.0709  -1379.51     0.26     -40.98     0.08
    11   0.0736  -1431.27    -0.04     -39.29    -0.00
    12   0.2214  -3419.20     0.13     368.99    -0.02
    13   0.2215  -3420.27    -0.07     369.69     0.02
    14   0.2217  -3421.54    -0.50     370.68     0.37
    15   0.3008  -3418.56     0.12     727.74     0.08
    16   0.3008  -3418.54     0.04     727.72    -0.04
    17   0.3010  -3417.50     0.03     728.59    -0.05
    18   0.3010  -3417.36     0.07     728.62    -0.11
    19   0.3010  -3417.24     0.09     728.67    -0.15
    20   0.9776   3056.73    -0.42    -522.23    -0.16
    21   0.9776   3056.58    -0.16    -522.37    -0.24
    22   0.9778   3053.99     0.42    -522.59    -0.03
    23   0.9778   3053.18     0.03    -522.42     0.19
    24   1.0567   1526.76    -0.07    -617.64    -0.23
    25   1.0568   1524.11     0.00    -617.79    -0.40
    26   3.9676  11466.06     0.00   -2259.67     0.08
    27   3.9677  11463.98    -0.06   -2260.01     0.07
    28   3.9678  11462.13     0.11   -2260.35     0.07

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.

17WH30    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        86.442    86.862    86.029
ecceobj         0.613     0.615     0.610
incobj         18.013    18.013    18.014
qmin           30.978    31.336    31.827
qmax          144.355   145.312   146.746
amean          83.964    84.448    86.014
amin           80.500    80.619    82.070
amax           88.579    89.007    89.659
emean           0.610     0.611     0.613
emin            0.587     0.581     0.585
emax            0.632     0.633     0.637
imean          17.177    17.680    18.064
imin           14.956    15.992    16.499
imax           18.664    19.371    19.680
excite_mean     0.678     0.683     0.687
fracstop        1.000     1.000     1.000
cjmean          2.886     2.881     2.887

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       194.3     170.7     181.3
kozaiamp        180.0     180.0     180.0