Orbit Fit and Astrometric record for 15VR169

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: 15VR169   
# Created Wed Feb 20 02:10:40 2019
# Orbit generated from Bernstein formalism
# Fitting   26 observations of   26
# Arc:   2.32y
# First observation: 2015/08/20
#  Last observation: 2017/12/13
Preliminary a, adot, b, bdot, g, gdot:
  -0.000097   0.016963  -0.000005  -0.005266   0.021008   0.000000
# Chi-squared of fit:     5.93 DOF:   46 RMS:  0.08
# Min/Max residuals:    -0.23    0.33
# Exact a, adot, b, bdot, g, gdot:
  1.266866E-05  1.676595E-02 -4.548530E-06 -5.213406E-03  2.083605E-02  1.966553E-03
# Covariance matrix:
  2.3780E-13  4.0824E-14  1.0858E-14 -5.1958E-14  2.1584E-13  4.5749E-12
  4.0824E-14  3.0861E-13  2.6281E-14 -1.2078E-13  2.5639E-13  1.0559E-11
  1.0858E-14  2.6281E-14  1.0845E-13 -8.4303E-14  2.8637E-14  1.3312E-12
 -5.1958E-14 -1.2078E-13 -8.4303E-14  1.6505E-13 -1.3387E-13 -6.0945E-12
  2.1584E-13  2.5639E-13  2.8637E-14 -1.3387E-13  4.0039E-13  1.1739E-11
  4.5749E-12  1.0559E-11  1.3312E-12 -6.0945E-12  1.1739E-11  5.3243E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.417238   54.956044    1.013876    0.000410   -0.038431  2457255.041279
# Heliocentric elements and errors
Epoch:              2457250.5000  =  2015/08/16
Mean Anomaly:          140.23719 +/-     0.378
Argument of Peri:       28.53601 +/-     0.371
Long of Asc Node:      235.09267 +/-     0.000
Inclination:            17.24629 +/-     0.001
Eccentricity:         0.15453339 +/-    0.0005
Semi-Major Axis:     42.62524141 +/-    0.0083
Time of Perihelion: 2417653.7638 +/-     106.1
Perihelion:          36.03821852 +/-    0.0240
Aphelion:            49.21226429 +/-    0.0249
Period (y)              278.2970 +/-      0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           28.40561077 +/-    0.0009
Ecliptic Y           38.74113271 +/-    0.0012
Ecliptic Z            0.34930249 +/-    0.0000
Ecliptic XDOT        -0.00165441 +/-    0.0000
Ecliptic YDOT         0.00147426 +/-    0.0000
Ecliptic ZDOT        -0.00068308 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   48.04035907 +/-    0.0011
Geocenter to KBO     47.99375135 +/-    0.0015
# Hcoef:  8.11

The following table shows the complete astrometric record for 15VR169. 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 (15VR169) followed by the observatory code and reference code for the source of the astrometry.

2015 08  20.54049  03 29 59.454  +19 24 38.55  24.7w 15VR169   568  C~2nw2      
2015 09  07.59637  03 29 53.848  +19 23 33.34  25.4w 15VR169   568  C~2nw2      
2015 09  12.44325  03 29 47.748  +19 22 59.22  25.5w 15VR169   568  C~2nw2      
2015 10  07.49180  03 28 47.878  +19 18 20.67  25.1w 15VR169   568  C~2nw2      
2015 10  07.55020  03 28 47.681  +19 18 19.65  25.0w 15VR169   568  C~2nw2      
2015 10  09.53094  03 28 41.161  +19 17 51.02  24.9w 15VR169   568  C~2nw2      
2015 11  06.30734  03 26 50.782  +19 09 55.51  24.5r 15VR169   568  C~2nw2      
2015 11  06.37060  03 26 50.536  +19 09 54.35  24.8r 15VR169   568  C~2nw2      
2015 11  06.44142  03 26 50.188  +19 09 53.08  24.9r 15VR169   568  C~2nw2      
2015 11  07.46098  03 26 45.685  +19 09 33.76  24.8w 15VR169   568  C~2nw3      
2015 11  17.44217  03 26 00.979  +19 06 21.68  25.0w 15VR169   568  C~2nw3      
2015 11  17.48946  03 26 00.782  +19 06 20.53  24.4w 15VR169   568  C~2nw3      
2015 12  06.30809  03 24 38.302  +19 00 20.83  25.2w 15VR169   568  C~2nw3      
2015 12  06.43481  03 24 37.769  +19 00 18.41  24.9w 15VR169   568  C~2nw3      
2015 12  31.32982  03 23 07.987  +18 53 26.05  25.2w 15VR169   568  C~2nw3      
2016 01  07.35914  03 22 49.305  +18 51 53.11  25.3w 15VR169   568  C~2nw3      
2016 02  11.25843  03 22 15.201  +18 47 47.59  24.9w 15VR169   568  C~2nw3      
2016 09  27.54346  03 33 32.818  +19 16 45.60  24.6w 15VR169   568  C~2nw3      
2016 11  02.46775  03 31 23.861  +19 07 28.37        15VR169   568  C~2nw3      
2016 12  24.36175  03 27 45.647  +18 51 53.85  25.2w 15VR169   568  C~2nw3      
2016 12  29.39711  03 27 29.488  +18 50 40.24  25.4w 15VR169   568  C~2nw3      
2017 01  27.33784  03 26 32.104  +18 45 44.78  25.3w 15VR169   568  C~2nw3      
2017 09  15.55809  03 38 14.415  +19 14 51.31  25.0w 15VR169   568  C~2nw3      
2017 09  20.60688  03 38 05.419  +19 14 04.60  24.9w 15VR169   568  C~2nw3      
2017 12  13.36234  03 32 44.629  +18 51 24.65  24.7w 15VR169   568  C~2nw3      
2017 12  13.40466  03 32 44.450  +18 51 23.91  25.0w 15VR169   568  C~2nw3      

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     0.01       0.00     0.12
  2   0.0494    -92.75    -0.04     -44.05     0.04
  3   0.0627   -184.76     0.06     -56.24    -0.07
  4   0.1313  -1074.42     0.01    -120.40     0.13
  5   0.1314  -1077.37    -0.08    -120.71    -0.04
  6   0.1369  -1173.87     0.03    -125.96    -0.01
  7   0.2129  -2806.20    -0.18    -203.50     0.01
  8   0.2131  -2809.86     0.33    -203.77    -0.10
  9   0.2133  -2814.96    -0.07    -203.78     0.07
 10   0.2161  -2881.57     0.01    -206.77     0.04
 11   0.2434  -3543.09    -0.13    -236.29     0.06
 12   0.2435  -3546.09     0.07    -236.71    -0.23
 13   0.2951  -4768.70    -0.01    -294.34     0.04
 14   0.2954  -4776.63     0.04    -294.80    -0.05
 15   0.3636  -6114.03    -0.13    -374.77     0.01
 16   0.3828  -6394.30     0.06    -397.94    -0.10
 17   0.4784  -6925.34     0.07    -513.34     0.06
 18   1.1061   2818.60    -0.00   -1183.01    -0.02
 19   1.2045    911.46     0.05   -1288.05     0.07
 20   1.3465  -2317.97    -0.07   -1443.39     0.02
 21   1.3603  -2558.44    -0.02   -1458.46    -0.01
 22   1.4396  -3421.14    -0.04   -1544.19    -0.05
 23   2.0726   6671.11    -0.03   -2227.49     0.04
 24   2.0864   6536.23    -0.02   -2243.53    -0.00
 25   2.3157   1793.28     0.10   -2498.05    -0.01
 26   2.3158   1790.63    -0.01   -2498.16    -0.01

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.

15VR169    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        42.980    43.007    42.955
ecceobj         0.151     0.152     0.149
incobj         17.172    17.172    17.172
qmin           34.977    34.978    35.063
qmax           50.729    50.750    50.649
amean          42.687    42.726    42.691
amin           42.295    42.355    42.303
amax           43.118    43.136    43.114
emean           0.159     0.159     0.156
emin            0.139     0.142     0.137
emax            0.177     0.178     0.177
imean          18.381    18.424    18.455
imin           17.553    17.670    17.755
imax           19.150    19.158    19.173
excite_mean     0.353     0.354     0.353
fracstop        1.000     1.000     1.000
cjmean          2.936     2.936     2.936

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       176.6     178.1     178.7
kozaiamp        180.0     179.9     179.9