Orbit Fit and Astrometric record for 16SW50

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: 16SW50    
# Created Wed Feb 20 02:10:44 2019
# Orbit generated from Bernstein formalism
# Fitting   25 observations of   26
# Arc:   1.16y
# First observation: 2016/09/22
#  Last observation: 2017/11/19
Preliminary a, adot, b, bdot, g, gdot:
  -0.000014   0.032392  -0.000014   0.017041   0.028352   0.000000
# Chi-squared of fit:    38.70 DOF:   44 RMS:  0.22
# Min/Max residuals:    -0.52    0.46
# Exact a, adot, b, bdot, g, gdot:
  1.789957E-05  3.233719E-02  1.018060E-05  1.697788E-02  2.842229E-02 -1.426238E-03
# Covariance matrix:
  6.3090E-13  1.6035E-12 -2.7596E-14  1.2638E-12  1.6992E-12  6.8840E-11
  1.6035E-12  3.2139E-11 -4.1417E-13  1.9170E-11  2.6436E-11  1.0439E-09
 -2.7596E-14 -4.1417E-13  4.9754E-13 -7.1773E-13 -3.4182E-13 -1.3748E-11
  1.2638E-12  1.9170E-11 -7.1773E-13  1.2144E-11  1.5933E-11  6.3414E-10
  1.6992E-12  2.6436E-11 -3.4182E-13  1.5933E-11  2.2331E-11  8.6739E-10
  6.8840E-11  1.0439E-09 -1.3748E-11  6.3414E-10  8.6739E-10  3.4535E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
  -18.527428   31.127479    0.525708   -0.272817   -0.814669  2457653.795841
# Heliocentric elements and errors
Epoch:              2457650.5000  =  2016/09/19
Mean Anomaly:          357.60340 +/-     0.243
Argument of Peri:      333.10783 +/-     0.863
Long of Asc Node:       61.06562 +/-     0.004
Inclination:            32.52567 +/-     0.003
Eccentricity:         0.50448633 +/-    0.0012
Semi-Major Axis:     72.38844003 +/-    0.1296
Time of Perihelion: 2459148.0976 +/-     152.0
Perihelion:          35.86946126 +/-    0.1064
Aphelion:           108.90741880 +/-    0.2127
Period (y)              615.9026 +/-      1.65
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           29.56028580 +/-    0.0048
Ecliptic Y           17.23677602 +/-    0.0029
Ecliptic Z          -11.17959848 +/-    0.0019
Ecliptic XDOT        -0.00127512 +/-    0.0000
Ecliptic YDOT         0.00286088 +/-    0.0000
Ecliptic ZDOT         0.00159430 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   35.99861617 +/-    0.0042
Geocenter to KBO     35.18365262 +/-    0.0058
# Hcoef:  9.19

The following table shows the complete astrometric record for 16SW50. 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 (16SW50) followed by the observatory code and reference code for the source of the astrometry.

2016 09  22.295052 02 21 28.01   -05 32 29.4   23.8r 16SW50    W84  C~2b80      
2016 09  26.242055 02 21 11.16   -05 34 25.0   23.5i 16SW50    W84  C~2b80      
2016 10  08.117471 02 20 14.86   -05 39 54.6   23.2i 16SW50    W84  C~2b80      
2016 11  22.173235 02 16 14.06   -05 50 47.4   24.1r 16SW50    W84  C~2b80      
2017 09  07.242427 02 27 59.02   -03 52 14.1   23.9z 16SW50    W84  C~2b80      
2017 09  12.370732 02 27 43.49   -03 54 39.9   24.1i 16SW50    W84  C~2b80      
2017 09  14.204861 02 27 37.45   -03 55 31.9   24.6g 16SW50    W84  C~2b80      
2017 09  14.217344 02 27 37.40   -03 55 31.9   24.3r 16SW50    W84  C~2b80      
2017 09  19.271041 02 27 19.18   -03 57 56.2   24.1i 16SW50    W84  C~2b80      
2017 09  23.245036 02 27 03.44   -03 59 50.0   24.4z 16SW50    W84  C~2b80      
2017 09  23.298315 02 27 03.25   -03 59 51.1   24.8g 16SW50    W84  C~2b80      
2017 09  23.310902 02 27 03.19   -03 59 51.7   24.3r 16SW50    W84  C~2b80      
2017 10  13.217533 02 25 29.67   -04 08 41.5   25.1g 16SW50    W84  C~2b80      
2017 10  14.168629 02 25 24.72   -04 09 04.3   24.1r 16SW50    W84  C~2b80      
2017 10  14.199558 02 25 24.57   -04 09 04.7   24.0i 16SW50    W84  C~2b80      
2017 10  17.284208 02 25 08.30   -04 10 15.7   24.8g 16SW50    W84  C~2b80      
2017 10  19.118714 02 24 58.47   -04 10 56.4   24.4r 16SW50    W84  C~2b80      
2017 10  19.138548 02 24 58.37   -04 10 56.5   24.1i 16SW50    W84  C~2b80      
2017 10  21.176395 02 24 47.33   -04 11 39.6   24.8g 16SW50    W84  C~2b80      
2017 10  26.238548 02 24 19.65   -04 13 18.8   24.1r 16SW50    W84  C~2b80      
2017 10  26.258431 02 24 19.54   -04 13 19.2   24.2i 16SW50    W84  C~2b80      
2017 10  31.120468 02 23 52.71   -04 14 42.2   23.9i 16SW50    W84  C~2b80      
2017 11  14.097765 02 22 36.23   -04 17 22.9   24.5r 16SW50    W84  C~2b80      
2017 11  14.117634 02 22 36.14   -04 17 23.0   24.2i 16SW50    W84  C~2b80      
2017 11  19.188985 02 22 09.42   -04 17 49.7   24.4r 16SW50    W84  C~2b80      
2017 11  19.222611 02 22 09.24   -04 17 49.8   24.0i 16SW50    W84  C~2b80      

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     0.02       0.00    -0.15
  2   0.0108   -275.93     0.06     -22.58     0.19
  3   0.0433  -1178.42    -0.08     -45.06    -0.05
  4   0.1667  -4780.40 (   1.06)    566.09 (   0.70)
  5   0.9581   7559.01     0.26    3645.37     0.19
  6   0.9721   7290.21    -0.49    3588.35    -0.43
  7   0.9772   7187.30     0.11    3570.59    -0.29
  8   0.9772   7186.59     0.14    3570.85     0.08
  9   0.9910   6880.52     0.17    3529.07     0.46
 10   1.0019   6619.89    -0.52    3503.16     0.16
 11   1.0021   6616.84     0.09    3503.10     0.38
 12   1.0021   6615.79    -0.10    3502.85     0.19
 13   1.0566   5118.25    -0.01    3485.96    -0.30
 14   1.0592   5040.81    -0.12    3489.97    -0.44
 15   1.0593   5038.56     0.20    3490.37    -0.20
 16   1.0677   4785.40     0.41    3507.24    -0.21
 17   1.0728   4633.21    -0.06    3519.48    -0.28
 18   1.0728   4631.77     0.17    3519.90    -0.01
 19   1.0784   4461.75    -0.19    3536.09     0.29
 20   1.0922   4038.54    -0.03    3584.97     0.12
 21   1.0923   4036.85    -0.03    3585.16     0.08
 22   1.1056   3631.19     0.07    3644.83    -0.13
 23   1.1439   2500.97    -0.06    3885.90     0.10
 24   1.1439   2499.67     0.21    3886.27     0.04
 25   1.1578   2114.91    -0.09    3998.05     0.08
 26   1.1579   2112.34    -0.13    3998.88     0.11

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.

16SW50    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        74.126    74.293    74.027
ecceobj         0.516     0.517     0.515
incobj         32.457    32.449    32.463
qmin           33.804    34.466    33.034
qmax          114.336   115.335   114.758
amean          72.945    73.648    72.675
amin           71.959    72.465    71.609
amax           74.436    75.268    74.173
emean           0.514     0.513     0.524
emin            0.495     0.494     0.494
emax            0.536     0.532     0.547
imean          30.969    31.371    30.198
imin           29.997    30.549    28.950
imax           31.909    32.272    31.905
excite_mean     0.727     0.731     0.726
fracstop        1.000     1.000     1.000
cjmean          2.702     2.702     2.702

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       143.3     126.7     125.3
kozaiamp        179.9     180.0     180.0