Orbit Fit and Astrometric record for 17EV51

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: 17EV51    
# Created Thu Oct 31 01:10:35 2024
# Orbit generated from Bernstein formalism
# Fitting     16 observations of     16
# Arc:   2.08y
# First observation: 2017/03/06
#  Last observation: 2019/04/06
Preliminary a, adot, b, bdot, g, gdot:
  -0.000005   0.021425  -0.000006   0.007552   0.023614   0.000000
# Chi-squared of fit:     8.12 DOF:     26 RMS:  0.13
# Min/Max residuals:    -0.36    0.26
# Exact a, adot, b, bdot, g, gdot:
  1.390411E-05  2.121576E-02  4.562848E-06  7.456984E-03  2.354912E-02 -3.878455E-03
# Covariance matrix:
  3.9027E-13  1.1175E-12 -4.0110E-14  5.5482E-13  8.0363E-13  3.3782E-11
  1.1175E-12  1.3865E-10 -4.3423E-12  6.5239E-11  3.5208E-11  3.9529E-09
 -4.0110E-14 -4.3423E-12  3.1033E-13 -2.1314E-12 -1.1091E-12 -1.2387E-10
  5.5482E-13  6.5239E-11 -2.1314E-12  3.0809E-11  1.6548E-11  1.8612E-09
  8.0363E-13  3.5208E-11 -1.1091E-12  1.6548E-11  1.0151E-11  1.0030E-09
  3.3782E-11  3.9529E-09 -1.2387E-10  1.8612E-09  1.0030E-09  1.1277E-07
#      lat0       lon0       xBary       yBary       zBary        JD0
    6.750638 -165.760529    0.473639    0.102347   -0.863532  2457819.081181
# Heliocentric elements and errors
Epoch:              2457810.5000  =  2017/02/26
Mean Anomaly:          291.67707 +/-     0.940
Argument of Peri:      108.51104 +/-     0.406
Long of Asc Node:      175.50316 +/-     0.002
Inclination:            20.45755 +/-     0.002
Eccentricity:         0.18441105 +/-    0.0149
Semi-Major Axis:     44.96610097 +/-    0.2115
Time of Perihelion: 2478712.6151 +/-     247.0
Perihelion:          36.67385501 +/-    0.6904
Aphelion:            53.25834692 +/-    0.7139
Period (y)              301.5338 +/-      2.13
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -41.83679877 +/-    0.0055
Ecliptic Y          -10.13252388 +/-    0.0014
Ecliptic Z            4.99184258 +/-    0.0007
Ecliptic XDOT         0.00114280 +/-    0.0000
Ecliptic YDOT        -0.00226221 +/-    0.0000
Ecliptic ZDOT         0.00080787 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.33479277 +/-    0.0054
Geocenter to KBO     42.46443404 +/-    0.0057
# Hcoef:  8.24

The following table shows the complete astrometric record for 17EV51. 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 (17EV51) followed by the observatory code and reference code for the source of the astrometry.

2017 03  06.58038  13 02 52.09   +00 36 43.7   24.8r 17EV51    T09  C~7xU7      
2017 03  06.60099  13 02 52.00   +00 36 44.4   24.8r 17EV51    T09  C~7xU7      
2017 03  06.64589  13 02 51.85   +00 36 45.7   24.8r 17EV51    T09  C~7xU7      
2017 03  29.44104  13 01 21.29   +00 49 12.1   24.0z 17EV51    T09  C~7xU7      
2017 03  29.48393  13 01 21.10   +00 49 13.3   24.7z 17EV51    T09  C~7xU7      
2017 03  29.56289  13 01 20.75   +00 49 15.5   25.4g 17EV51    T09  C~7xU7      
2017 04  29.30398  12 59 11.66   +01 04 15.8   24.8z 17EV51    T09  C~7xU7      
2017 04  29.34700  12 59 11.47   +01 04 17.0   24.6z 17EV51    T09  C~7xU7      
2017 04  29.39587  12 59 11.31   +01 04 18.0   24.4z 17EV51    T09  C~7xU7      
2019 04  03.507135 13 11 26.81   +00 42 35.7         17EV51    T09  C~81By      
2019 04  03.523270 13 11 26.75   +00 42 36.2   23.5i 17EV51    T09  C~81By      
2019 04  06.39405  13 11 14.34   +00 44 08.0   24.3i 17EV51    T09  C~81By      
2019 04  06.42440  13 11 14.19   +00 44 09.2   24.0i 17EV51    T09  C~81By      
2019 04  06.49817  13 11 13.87   +00 44 11.2   23.8i 17EV51    T09  C~81By      
2019 04  06.53654  13 11 13.70   +00 44 12.5   24.2i 17EV51    T09  C~81By      
2019 04  06.53921  13 11 13.69   +00 44 12.5   23.9i 17EV51    T09  C~81By      

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     0.07       0.00     0.09
     2   0.0001     -1.52    -0.16       0.13     0.04
     3   0.0002     -4.09     0.07       0.46    -0.02
     4   0.0626  -1545.17    -0.01     165.48     0.22
     5   0.0627  -1548.27     0.01     165.49     0.02
     6   0.0629  -1553.96     0.04     165.49    -0.36
     7   0.1471  -3687.82     0.02     250.02    -0.02
     8   0.1472  -3690.92    -0.30     250.03    -0.00
     9   0.1473  -3693.52     0.26     250.03     0.01
    10   2.0751   6990.17    -0.13    3304.57    -0.04
    11   2.0751   6989.14     0.03    3304.68     0.00
    12   2.0830   6781.75     0.14    3317.48     0.06
    13   2.0831   6779.20    -0.17    3317.72     0.19
    14   2.0833   6774.00     0.05    3317.71    -0.09
    15   2.0834   6771.14     0.01    3317.93    -0.02
    16   2.0834   6771.00     0.06    3317.87    -0.09

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.

17EV51    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        44.439    44.971    44.064
ecceobj         0.182     0.222     0.143
incobj         20.566    20.560    20.571
qmin           36.086    34.688    37.484
qmax           53.797    56.345    51.405
amean          44.696    45.257    44.312
amin           44.313    44.860    43.951
amax           45.146    45.737    44.729
emean           0.174     0.213     0.136
emin            0.159     0.196     0.121
emax            0.192     0.233     0.151
imean          20.423    20.492    20.357
imin           19.888    19.856    19.922
imax           20.985    21.141    20.789
excite_mean     0.390     0.410     0.374
fracstop        1.000     1.000     1.000
cjmean          2.922     2.909     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       188.3     189.9     185.4
kozaiamp        180.0     180.0     180.0