Orbit Fit and Astrometric record for 15RU278

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: 15RU278   
# Created Thu Apr 18 01:10:35 2019
# Orbit generated from Bernstein formalism
# Fitting   35 observations of   35
# Arc:   2.44y
# First observation: 2015/07/14
#  Last observation: 2017/12/23
Preliminary a, adot, b, bdot, g, gdot:
  -0.000055   0.018901   0.000022  -0.009638   0.022157   0.000000
# Chi-squared of fit:     4.03 DOF:   64 RMS:  0.06
# Min/Max residuals:    -0.23    0.21
# Exact a, adot, b, bdot, g, gdot:
  1.341180E-05  1.857321E-02 -6.507140E-06 -9.444180E-03  2.189223E-02 -4.444441E-03
# Covariance matrix:
  1.3171E-13  5.7766E-15  6.8630E-15 -4.0985E-14  1.1191E-13  2.1003E-12
  5.7766E-15  2.4153E-13  3.1531E-14 -1.5109E-13  2.1667E-13  7.6721E-12
  6.8630E-15  3.1531E-14  9.6237E-14 -9.4719E-14  3.2587E-14  1.7583E-12
 -4.0985E-14 -1.5109E-13 -9.4719E-14  2.3302E-13 -1.6844E-13 -7.9880E-12
  1.1191E-13  2.1667E-13  3.2587E-14 -1.6844E-13  3.2219E-13  8.5822E-12
  2.1003E-12  7.6721E-12  1.7583E-12 -7.9880E-12  8.5822E-12  4.0457E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    3.318665   12.906688    1.005393    0.009187   -0.156688  2457218.059119
# Heliocentric elements and errors
Epoch:              2457210.5000  =  2015/07/07
Mean Anomaly:          305.93307 +/-     0.049
Argument of Peri:      253.77823 +/-     0.045
Long of Asc Node:      198.09049 +/-     0.000
Inclination:            27.24778 +/-     0.001
Eccentricity:         0.24766757 +/-    0.0010
Semi-Major Axis:     50.72726068 +/-    0.0264
Time of Perihelion: 2477029.8657 +/-       9.2
Perihelion:          38.16376348 +/-    0.0542
Aphelion:            63.29075788 +/-    0.0602
Period (y)              361.3020 +/-      0.28
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           44.82356154 +/-    0.0012
Ecliptic Y            9.24115754 +/-    0.0003
Ecliptic Z            2.64403855 +/-    0.0001
Ecliptic XDOT        -0.00099533 +/-    0.0000
Ecliptic YDOT         0.00214913 +/-    0.0000
Ecliptic ZDOT        -0.00121123 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.84257412 +/-    0.0011
Geocenter to KBO     45.67830578 +/-    0.0012
# Hcoef:  6.89

The following table shows the complete astrometric record for 15RU278. 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 (15RU278) followed by the observatory code and reference code for the source of the astrometry.

2015 07  14.55833  00 42 16.502  +08 09 09.85  23.4r 15RU278   568  C~2lVR      
2015 07  19.53712  00 42 15.256  +08 08 56.69  23.3r 15RU278   568  C~2lVR      
2015 08  13.50040  00 41 40.868  +08 04 41.59  23.6r 15RU278   568  C~2lVR      
2015 08  19.56300  00 41 26.040  +08 02 54.47  23.4r 15RU278   568  C~2lVR      
2015 08  19.63315  00 41 25.863  +08 02 52.98  23.3r 15RU278   568  C~2lVR      
2015 08  20.43842  00 41 23.716  +08 02 37.60  23.4r 15RU278   568  C~2lVR      
2015 08  20.48765  00 41 23.577  +08 02 36.65  23.2r 15RU278   568  C~2lVR      
2015 09  07.58494  00 40 26.380  +07 55 39.98  23.6w 15RU278   568  C~2lVR      
2015 09  09.41265  00 40 19.798  +07 54 51.48  23.3r 15RU278   568  C~2lVR      
2015 09  09.45371  00 40 19.641  +07 54 50.41  23.3r 15RU278   568  C~2lVR      
2015 09  09.49464  00 40 19.492  +07 54 49.31  23.1r 15RU278   568  C~2lVR      
2015 09  10.51893  00 40 15.739  +07 54 21.54  23.7w 15RU278   568  C~2lVR      
2015 09  18.48318  00 39 45.443  +07 50 36.00  23.6w 15RU278   568  C~2lVR      
2015 10  08.37093  00 38 24.960  +07 40 18.62  23.4w 15RU278   568  C~2lVS      
2015 10  08.42353  00 38 24.740  +07 40 16.93  23.3w 15RU278   568  C~2lVS      
2015 10  09.34050  00 38 21.004  +07 39 47.43  23.3w 15RU278   568  C~2lVS      
2015 11  10.46704  00 36 22.269  +07 23 08.64  23.5w 15RU278   568  C~2lVS      
2016 01  02.27875  00 35 18.043  +07 07 36.96  23.7w 15RU278   568  C~2lVS      
2016 07  07.58323  00 47 04.011  +08 04 06.28  23.8w 15RU278   568  C~2lVS      
2016 07  08.56262  00 47 04.509  +08 04 07.71  23.7w 15RU278   568  C~2lVS      
2016 09  05.48236  00 45 24.860  +07 51 08.15  23.5w 15RU278   568  C~2lVS      
2016 09  05.57499  00 45 24.531  +07 51 05.74  23.5w 15RU278   568  C~2lVS      
2016 09  06.43656  00 45 21.519  +07 50 43.27  23.5w 15RU278   568  C~2lVS      
2016 09  06.47701  00 45 21.370  +07 50 42.17  23.6w 15RU278   568  C~2lVS      
2016 09  06.52410  00 45 21.203  +07 50 41.03  23.4w 15RU278   568  C~2lVS      
2016 09  06.56619  00 45 21.050  +07 50 39.89  23.4w 15RU278   568  C~2lVS      
2016 09  26.43941  00 44 04.702  +07 41 05.54  23.4w 15RU278   568  C~2lVS      
2016 11  04.28877  00 41 32.001  +07 20 39.27  24.0w 15RU278   568  C~2lVS      
2016 11  04.34801  00 41 31.791  +07 20 37.56  23.9w 15RU278   568  C~2lVS      
2016 12  29.29357  00 40 02.367  +07 02 50.42  23.3w 15RU278   568  C~2lVS      
2017 01  02.32887  00 40 05.197  +07 02 29.56  23.8w 15RU278   568  C~2lVS      
2017 09  16.52330  00 49 41.771  +07 40 47.69  23.9w 15RU278   568  C~2lVS      
2017 09  22.47675  00 49 18.419  +07 37 51.00  23.4w 15RU278   568  C~2lVS      
2017 11  22.34591  00 45 33.175  +07 07 14.61  23.6w 15RU278   568  C~2lVS      
2017 12  23.28322  00 44 51.061  +06 58 20.62  23.9w 15RU278   568  C~2lVS      

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     0.00       0.00    -0.06
  2   0.0136    -22.18    -0.02      -4.86     0.02
  3   0.0820   -591.96    -0.20     -39.45     0.06
  4   0.0986   -836.55     0.09     -51.65    -0.01
  5   0.0988   -839.55     0.21     -51.99    -0.23
  6   0.1010   -874.92     0.02     -53.63    -0.02
  7   0.1011   -877.19    -0.02     -53.70    -0.00
  8   0.1507  -1822.23    -0.01    -103.50    -0.02
  9   0.1557  -1931.21     0.00    -109.70     0.06
 10   0.1558  -1933.78    -0.05    -109.77     0.11
 11   0.1559  -1936.25    -0.00    -109.91     0.09
 12   0.1587  -1998.44    -0.02    -113.54     0.03
 13   0.1805  -2501.07    -0.02    -144.05    -0.03
 14   0.2349  -3844.02    -0.04    -241.01     0.02
 15   0.2351  -3847.69    -0.05    -241.28     0.03
 16   0.2376  -3910.38    -0.01    -246.52     0.03
 17   0.3256  -5928.03     0.11    -468.12     0.00
 18   0.4701  -7175.37     0.01    -946.67    -0.08
 19   0.9830   3812.88     0.02   -1946.26    -0.03
 20   0.9856   3820.25    -0.03   -1947.83     0.04
 21   1.1470   2152.77     0.03   -2089.23     0.00
 22   1.1472   2147.33     0.04   -2089.55    -0.01
 23   1.1496   2097.35     0.02   -2092.78    -0.02
 24   1.1497   2094.88    -0.04   -2092.93    -0.04
 25   1.1498   2092.15     0.03   -2093.01     0.04
 26   1.1499   2089.61     0.00   -2093.18     0.01
 27   1.2043    820.58     0.02   -2179.02    -0.01
 28   1.3107  -1749.26     0.01   -2418.74    -0.01
 29   1.3109  -1752.80    -0.01   -2419.08     0.05
 30   1.4613  -3396.09    -0.07   -2878.53    -0.06
 31   1.4723  -3365.53    -0.03   -2914.27     0.01
 32   2.1765   5431.41    -0.03   -4146.59    -0.02
 33   2.1928   5042.58    -0.04   -4174.80     0.01
 34   2.3594   1239.71     0.10   -4563.23     0.04
 35   2.4441    453.92    -0.03   -4810.41    -0.02

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.

15RU278    quality flag:3

Type:       SCATNEAR  SCATNEAR  SCATNEAR

axisobj        51.248    51.318    51.180
ecceobj         0.249     0.252     0.247
incobj         27.108    27.108    27.108
qmin           37.520    37.518    37.620
qmax           64.940    65.075    64.658
amean          50.929    50.989    50.847
amin           50.428    50.518    50.365
amax           51.539    51.569    51.401
emean           0.244     0.243     0.240
emin            0.229     0.221     0.222
emax            0.261     0.263     0.258
imean          27.446    27.466    27.430
imin           27.004    27.090    27.110
imax           27.768    28.035    27.914
excite_mean     0.521     0.521     0.519
fracstop        1.000     1.000     1.000
cjmean          2.830     2.831     2.832

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       181.1     176.2     175.5
kozaiamp        180.0     180.0     180.0