Orbit Fit and Astrometric record for 15UK84

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: 15UK84    
# Created Tue Oct 24 01:38:35 2017
# Orbit generated from Bernstein formalism
# Fitting   20 observations of   21
# Arc:   2.03y
# First observation: 2014/10/14
#  Last observation: 2016/10/23
Preliminary a, adot, b, bdot, g, gdot:
   0.000039   0.027130  -0.000005  -0.008249   0.025921   0.000000
# Chi-squared of fit:    13.48 DOF:   34 RMS:  0.15
# Min/Max residuals:    -0.46    0.23
# Exact a, adot, b, bdot, g, gdot:
  1.604602E-05  2.733388E-02 -6.002417E-06 -8.301244E-03  2.610371E-02  3.517935E-03
# Covariance matrix:
  8.5132E-13 -7.1586E-13 -7.1177E-14  1.1633E-13  3.4040E-13 -5.2334E-12
 -7.1586E-13  1.8292E-12  1.7472E-13 -5.2066E-13  9.5576E-13  2.7436E-11
 -7.1177E-14  1.7472E-13  4.9655E-13 -3.2396E-13  4.5257E-14  2.7072E-12
  1.1633E-13 -5.2066E-13 -3.2396E-13  3.4995E-13 -3.5940E-13 -8.8851E-12
  3.4040E-13  9.5576E-13  4.5257E-14 -3.5940E-13  1.9585E-12  2.1041E-11
 -5.2334E-12  2.7436E-11  2.7072E-12 -8.8851E-12  2.1041E-11  4.7586E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
  -17.097706   19.572914   -0.015683   -0.293649   -0.955227  2456944.726820
# Heliocentric elements and errors
Epoch:              2456940.5000  =  2014/10/10
Mean Anomaly:           22.66490 +/-     0.096
Argument of Peri:      188.84605 +/-     0.178
Long of Asc Node:      156.39141 +/-     0.002
Inclination:            23.62273 +/-     0.001
Eccentricity:         0.23718638 +/-    0.0005
Semi-Major Axis:     49.49799161 +/-    0.0161
Time of Perihelion: 2448932.3697 +/-      33.6
Perihelion:          37.75774205 +/-    0.0296
Aphelion:            61.23824117 +/-    0.0335
Period (y)              348.2488 +/-      0.17
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           35.43342897 +/-    0.0019
Ecliptic Y           12.61784221 +/-    0.0006
Ecliptic Z          -11.26310262 +/-    0.0006
Ecliptic XDOT        -0.00087384 +/-    0.0000
Ecliptic YDOT         0.00272888 +/-    0.0000
Ecliptic ZDOT        -0.00094055 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   39.26315462 +/-    0.0017
Geocenter to KBO     38.30872581 +/-    0.0021
# Hcoef:  7.19

The following table shows the complete astrometric record for 15UK84. 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 (15UK84) followed by the observatory code and reference code for the source of the astrometry.

2014 10  14.226042 01 38 03.92   -08 11 06.7   23.0i 15UK84    W84  C~2Ckn      
2014 12  13.147998 01 34 06.86   -08 25 17.5   23.3g 15UK84    W84  C~2Ckn      
2015 10  17.183773 01 44 24.28   -08 03 20.9   22.5i 15UK84    W84  C~1yTE      
2015 10  17.185139 01 44 24.27   -08 03 21.2   22.4r 15UK84    W84  C~1yTE      
2015 11  01.211250 01 43 13.24   -08 10 17.7   22.2z 15UK84    W84  C~1yTE      
2015 11  15.179664 01 42 10.91   -08 14 41.5   22.2z 15UK84    W84  C~1yTE      
2015 11  15.181030 01 42 10.91   -08 14 41.1   22.7i 15UK84    W84  C~1yTE      
2015 11  15.182407 01 42 10.90   -08 14 41.3   22.7r 15UK84    W84  C~1yTE      
2015 11  15.183773 01 42 10.90   -08 14 41.1   23.1g 15UK84    W84  C~1yTE      
2015 11  20.125023 01 41 50.69   -08 15 41.9   22.5z 15UK84    W84  C~1yTE      
2016 09  14.285880 01 53 10.35   -07 33 48.7   22.0z 15UK84    W84  C~2Ckn      
2016 10  03.256944 01 51 54.64   -07 46 12.8   22.1i 15UK84    W84  C~2Ckn      
2016 10  03.258333 01 51 54.65   -07 46 12.7   22.6r 15UK84    W84  C~2Ckn      
2016 10  03.259711 01 51 54.63   -07 46 12.8   23.1g 15UK84    W84  C~2Ckn      
2016 10  22.282905 01 50 26.36   -07 56 47.3   22.4i 15UK84    W84  C~2Ckn      
2016 10  22.286481 01 50 26.35   -07 56 47.4   22.8i 15UK84    W84  C~2Ckn      
2016 10  22.287847 01 50 26.34   -07 56 47.5   22.2z 15UK84    W84  C~2Ckn      
2016 10  23.201389 01 50 22.01   -07 57 13.7   22.7r 15UK84    W84  C~2Ckn      
2016 10  23.202766 01 50 22.00   -07 57 13.8   23.1g 15UK84    W84  C~2Ckn      
2016 10  23.204132 01 50 21.99   -07 57 13.8   22.7r 15UK84    W84  C~2Ckn      
2016 10  23.205509 01 50 21.98   -07 57 13.8   23.3g 15UK84    W84  C~2Ckn      

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     0.11       0.00     0.20
  2   0.1641  -3579.82    -0.06     540.50     0.04
  3   1.0074   5402.00    -0.18   -1718.58    -0.25
  4   1.0074   5401.75    -0.32   -1718.80    -0.46
  5   1.0486   4267.19 (   0.47)  -1700.75 (  -0.23)
  6   1.0868   3310.78    -0.05   -1591.66    -0.21
  7   1.0868   3310.93     0.19   -1591.29     0.14
  8   1.0868   3310.72     0.07   -1591.42    -0.00
  9   1.0868   3310.80     0.23   -1591.24     0.17
 10   1.1003   3010.16    -0.04   -1533.14     0.15
 11   1.9194  13318.17     0.11   -3093.77     0.23
 12   1.9713  11987.45    -0.07   -3344.65    -0.07
 13   1.9713  11987.63     0.21   -3344.62    -0.02
 14   1.9713  11987.31     0.00   -3344.60     0.01
 15   2.0234  10527.93    -0.11   -3423.08     0.06
 16   2.0234  10527.75    -0.01   -3423.12     0.02
 17   2.0234  10527.58    -0.08   -3423.15    -0.02
 18   2.0259  10457.93     0.07   -3422.49    -0.01
 19   2.0259  10457.76     0.00   -3422.53    -0.04
 20   2.0259  10457.62    -0.03   -3422.47     0.01
 21   2.0260  10457.48    -0.06   -3422.41     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.

15UK84    quality flag:2

Type:       SCATEXTD  SCATNEAR  SCATNEAR

axisobj        50.028    50.082    49.975
ecceobj         0.245     0.247     0.244
incobj         23.557    23.558    23.557
qmin           36.340    36.359    37.017
qmax           63.376    63.546    62.668
amean          49.592    49.658    49.549
amin           49.158    49.189    49.100
amax           50.127    50.207    50.094
emean           0.247     0.249     0.238
emin            0.230     0.232     0.227
emax            0.265     0.266     0.251
imean          22.332    22.335    22.579
imin           21.761    21.783    22.253
imax           22.780    22.788    22.898
excite_mean     0.453     0.454     0.452
fracstop        1.000     1.000     1.000
cjmean          2.907     2.907     2.908

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       193.6     191.7     181.7
kozaiamp        180.0     180.0     179.9