Orbit Fit and Astrometric record for 17BA245

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: 17BA245   
# Created Tue Apr  1 01:11:02 2025
# Orbit generated from Bernstein formalism
# Fitting     18 observations of     18
# Arc:   2.02y
# First observation: 2017/01/26
#  Last observation: 2019/02/04
Preliminary a, adot, b, bdot, g, gdot:
  -0.000033   0.023006  -0.000000  -0.001794   0.023089   0.000000
# Chi-squared of fit:     9.42 DOF:     30 RMS:  0.13
# Min/Max residuals:    -0.24    0.27
# Exact a, adot, b, bdot, g, gdot:
  1.528054E-05  2.282188E-02 -2.314308E-06 -1.781819E-03  2.321473E-02 -6.220993E-03
# Covariance matrix:
  1.5318E-13 -2.1481E-13 -8.1716E-16  3.6316E-15  9.5864E-14 -2.4915E-12
 -2.1481E-13  2.3743E-12  1.1156E-14 -1.2595E-13  3.9391E-13  5.0398E-11
 -8.1716E-16  1.1156E-14  1.1579E-13 -8.2400E-14  1.4595E-15  2.5525E-13
  3.6316E-15 -1.2595E-13 -8.2400E-14  2.0255E-13 -3.9346E-14 -2.9932E-12
  9.5864E-14  3.9391E-13  1.4595E-15 -3.9346E-14  5.6140E-13  1.1499E-11
 -2.4915E-12  5.0398E-11  2.5525E-13 -2.9932E-12  1.1499E-11  1.1770E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
  -11.395949  153.143975    0.445927   -0.173603   -0.862162  2457780.059671
# Heliocentric elements and errors
Epoch:              2457780.5000  =  2017/01/27
Mean Anomaly:          317.25870 +/-     0.065
Argument of Peri:      323.54773 +/-     0.098
Long of Asc Node:      264.87168 +/-     0.005
Inclination:            12.04712 +/-     0.000
Eccentricity:         0.31734503 +/-    0.0015
Semi-Major Axis:     52.76725634 +/-    0.0522
Time of Perihelion: 2474402.7718 +/-       5.3
Perihelion:          36.02182958 +/-    0.0880
Aphelion:            69.51268309 +/-    0.1058
Period (y)              383.3143 +/-      0.57
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -38.25921479 +/-    0.0012
Ecliptic Y           19.86641267 +/-    0.0006
Ecliptic Z           -8.51143639 +/-    0.0003
Ecliptic XDOT        -0.00053435 +/-    0.0000
Ecliptic YDOT        -0.00275158 +/-    0.0000
Ecliptic ZDOT        -0.00006109 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   43.94185269 +/-    0.0011
Geocenter to KBO     43.07609325 +/-    0.0014
# Hcoef:  7.86

The following table shows the complete astrometric record for 17BA245. 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 (17BA245) followed by the observatory code and reference code for the source of the astrometry.

2017 01  26.558870 10 03 58.52   -00 17 38.2         17BA245   T09  C~89UU      
2017 01  26.612614 10 03 58.29   -00 17 37.9         17BA245   T09  C~89UU      
2017 01  28.51088  10 03 50.55   -00 17 10.3   23.8z 17BA245   T09  C~89UU      
2017 01  28.53366  10 03 50.45   -00 17 10.1   23.8z 17BA245   T09  C~89UU      
2017 01  28.55243  10 03 50.39   -00 17 09.6   23.8z 17BA245   T09  C~89UU      
2017 01  28.56591  10 03 50.33   -00 17 09.4   23.5z 17BA245   T09  C~89UU      
2017 02  02.36824  10 03 30.22   -00 15 52.8   24.3r 17BA245   T09  C~89UU      
2017 02  02.37761  10 03 30.17   -00 15 52.6   24.4r 17BA245   T09  C~89UU      
2017 02  02.39961  10 03 30.08   -00 15 52.1   24.1r 17BA245   T09  C~89UU      
2017 02  02.41283  10 03 30.04   -00 15 51.8   24.2r 17BA245   T09  C~89UU      
2017 03  29.233920 09 59 44.36   +00 06 28.7         17BA245   T09  C~89UU      
2017 03  29.251276 09 59 44.30   +00 06 29.0         17BA245   T09  C~89UU      
2017 04  28.332402 09 58 39.57   +00 18 32.6         17BA245   T09  C~89UU      
2018 01  17.53186  10 09 20.73   -00 53 13.5   24.4i 17BA245   T09  C~89UU      
2018 01  17.56687  10 09 20.62   -00 53 13.4   24.4i 17BA245   T09  C~89UU      
2018 01  17.59367  10 09 20.53   -00 53 13.0   24.6i 17BA245   T09  C~89UU      
2018 12  13.640380 10 15 33.12   -01 26 12.9         17BA245   T09  C~89UU      
2019 02  04.427442 10 13 01.07   -01 23 36.4         17BA245   T09  C~89UU      

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     0.05       0.00     0.23
     2   0.0001     -3.33     0.09      -0.94    -0.24
     3   0.0053   -121.67    -0.03     -16.34     0.00
     4   0.0054   -123.14    -0.04     -16.69    -0.15
     5   0.0055   -124.16     0.14     -16.54     0.15
     6   0.0055   -125.07     0.09     -16.67     0.13
     7   0.0186   -434.27    -0.04     -52.11    -0.02
     8   0.0187   -435.04    -0.19     -52.19    -0.04
     9   0.0187   -436.48    -0.16     -52.20     0.11
    10   0.0188   -437.15     0.06     -52.13     0.27
    11   0.1689  -4078.25    -0.02      -0.32    -0.07
    12   0.1689  -4079.20    -0.00      -0.36    -0.24
    13   0.2513  -5244.35     0.03     331.66    -0.21
    14   0.9746   5277.21    -0.24    -281.82     0.02
    15   0.9747   5275.63     0.09    -282.32    -0.08
    16   0.9748   5274.23     0.15    -282.42     0.12
    17   1.8784  11210.77     0.02    -153.36    -0.01
    18   2.0229   9017.89    -0.02    -815.40     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.

17BA245    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        52.239    52.362    52.119
ecceobj         0.310     0.314     0.306
incobj         12.023    12.023    12.023
qmin           35.181    34.998    34.896
qmax           70.337    70.881    70.943
amean          52.338    52.446    52.347
amin           51.675    51.709    51.699
amax           53.141    53.250    53.246
emean           0.311     0.316     0.313
emin            0.296     0.298     0.293
emax            0.328     0.333     0.334
imean          13.553    13.526    13.335
imin           12.897    12.640    12.481
imax           14.204    14.122    14.104
excite_mean     0.390     0.393     0.389
fracstop        1.000     1.000     1.000
cjmean          3.011     3.009     3.012

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       178.0     171.7     178.3
kozaiamp        180.0     180.0     180.0