Orbit Fit and Astrometric record for 15VU170

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: 15VU170   
# Created Tue Apr  1 01:10:41 2025
# Orbit generated from Bernstein formalism
# Fitting     29 observations of     29
# Arc:   2.02y
# First observation: 2015/09/12
#  Last observation: 2017/09/20
Preliminary a, adot, b, bdot, g, gdot:
  -0.000074   0.022611   0.000001   0.000726   0.023548   0.000000
# Chi-squared of fit:     8.67 DOF:     52 RMS:  0.10
# Min/Max residuals:    -0.28    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.496728E-05  2.247857E-02  5.480298E-07  7.232810E-04  2.352597E-02 -2.394344E-04
# Covariance matrix:
  2.4663E-13 -5.4702E-14 -7.9804E-16  3.2978E-15  1.6673E-13  2.6053E-12
 -5.4702E-14  3.1865E-13 -2.1282E-15  9.2817E-15  1.6369E-13  7.3313E-12
 -7.9804E-16 -2.1282E-15  1.3068E-13 -1.0740E-13 -2.1710E-15 -8.9393E-14
  3.2978E-15  9.2817E-15 -1.0740E-13  1.4329E-13  9.2535E-15  3.8911E-13
  1.6673E-13  1.6369E-13 -2.1710E-15  9.2535E-15  2.9075E-13  7.3096E-12
  2.6053E-12  7.3313E-12 -8.9393E-14  3.8911E-13  7.3096E-12  3.0735E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    0.058248   51.932655    0.897166    0.000615   -0.463801  2457277.993429
# Heliocentric elements and errors
Epoch:              2457270.5000  =  2015/09/05
Mean Anomaly:          260.46671 +/-     0.295
Argument of Peri:      105.16262 +/-     0.286
Long of Asc Node:       48.95420 +/-     0.001
Inclination:             1.84900 +/-     0.001
Eccentricity:         0.03449958 +/-    0.0008
Semi-Major Axis:     42.68440303 +/-    0.0037
Time of Perihelion: 2485432.7982 +/-      83.3
Perihelion:          41.21180885 +/-    0.0325
Aphelion:            44.15699720 +/-    0.0325
Period (y)              278.8766 +/-      0.04
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.19699427 +/-    0.0006
Ecliptic Y           33.27624540 +/-    0.0008
Ecliptic Z            0.04324826 +/-    0.0000
Ecliptic XDOT        -0.00207858 +/-    0.0000
Ecliptic YDOT         0.00158453 +/-    0.0000
Ecliptic ZDOT         0.00008420 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.97658521 +/-    0.0007
Geocenter to KBO     42.50621442 +/-    0.0010
# Hcoef:  8.88

The following table shows the complete astrometric record for 15VU170. 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 (15VU170) followed by the observatory code and reference code for the source of the astrometry.

2015 09  12.49264  03 17 59.868  +18 18 22.75  25.4w 15VU170   568  C~2nw7      
2015 10  07.53854  03 16 49.644  +18 14 06.89  25.4w 15VU170   568  C~2nw7      
2015 10  07.59790  03 16 49.428  +18 14 06.11  25.2w 15VU170   568  C~2nw7      
2015 10  09.57780  03 16 41.975  +18 13 38.49  25.5w 15VU170   568  C~2nw7      
2015 11  07.33264  03 14 33.599  +18 05 36.10  25.1r 15VU170   568  C~2nw7      
2015 11  07.37479  03 14 33.390  +18 05 35.38  25.0r 15VU170   568  C~2nw7      
2015 11  07.41697  03 14 33.175  +18 05 34.35  24.6r 15VU170   568  C~2nw7      
2015 11  17.34635  03 13 44.430  +18 02 29.09  25.2w 15VU170   568  C~2nw7      
2015 11  17.39294  03 13 44.194  +18 02 28.31  25.3w 15VU170   568  C~2nw7      
2015 12  06.35508  03 12 14.586  +17 56 44.77  25.5w 15VU170   568  C~2nw7      
2016 01  01.34294  03 10 37.828  +17 50 31.63  25.5w 15VU170   568  C~2nw7      
2016 01  08.25043  03 10 20.141  +17 49 23.68  25.9w 15VU170   568  C~2nw7      
2016 02  05.28189  03 09 52.679  +17 47 43.23  25.7w 15VU170   568  C~2nw7      
2016 02  10.30227  03 09 55.751  +17 47 57.11  25.0w 15VU170   568  C~2nw7      
2016 09  07.57363  03 23 18.327  +18 40 48.55  25.6w 15VU170   568  C~2nw7      
2016 09  29.48481  03 22 28.740  +18 37 57.31  25.2w 15VU170   568  C~2nw7      
2016 10  05.48792  03 22 08.627  +18 36 45.84  25.8w 15VU170   568  C~2nw7      
2016 10  07.49247  03 22 01.386  +18 36 19.66  25.1w 15VU170   568  C~2nw7      
2016 10  07.58817  03 22 00.989  +18 36 18.69  25.6w 15VU170   568  C~2nw7      
2016 10  09.49252  03 21 53.871  +18 35 53.13  25.8w 15VU170   568  C~2nw7      
2016 10  09.56525  03 21 53.595  +18 35 52.24  25.5w 15VU170   568  C~2nw7      
2016 11  04.40663  03 19 59.312  +18 28 57.15  25.1w 15VU170   568  C~2nw7      
2016 12  24.30698  03 16 12.798  +18 14 54.26  25.2w 15VU170   568  C~2nw7      
2016 12  24.32550  03 16 12.721  +18 14 53.97  25.3w 15VU170   568  C~2nw7      
2017 01  02.40920  03 15 43.999  +18 13 06.22  26.2w 15VU170   568  C~2nw7      
2017 01  02.42780  03 15 43.950  +18 13 06.11  25.2w 15VU170   568  C~2nw7      
2017 01  27.27995  03 15 01.122  +18 10 27.18  25.5w 15VU170   568  C~2nw7      
2017 09  15.56413  03 28 19.302  +19 01 39.97  25.7w 15VU170   568  C~2nw7      
2017 09  20.61305  03 28 08.583  +19 01 04.59  25.6w 15VU170   568  C~2nw7      

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     0.03       0.00    -0.01
     2   0.0686  -1032.40    -0.15      12.06     0.00
     3   0.0687  -1035.57    -0.02      12.10     0.01
     4   0.0742  -1145.29    -0.03      13.04     0.01
     5   0.1529  -3037.69     0.12      25.83    -0.05
     6   0.1530  -3040.76     0.14      25.92     0.00
     7   0.1531  -3043.99    -0.01      25.73    -0.22
     8   0.1803  -3763.56    -0.05      30.11     0.01
     9   0.1804  -3767.01    -0.08      30.24     0.11
    10   0.2323  -5091.34    -0.01      37.64     0.06
    11   0.3035  -6523.13    -0.12      46.70    -0.03
    12   0.3224  -6784.93     0.02      48.97    -0.00
    13   0.3991  -7190.16     0.17      57.57     0.00
    14   0.4129  -7144.11    -0.02      59.14     0.11
    15   0.9886   4724.40    -0.06     147.10     0.01
    16   1.0486   3998.95    -0.03     158.82     0.09
    17   1.0650   3704.16     0.05     161.88     0.04
    18   1.0705   3597.92     0.24     162.58    -0.28
    19   1.0708   3592.21    -0.18     163.07     0.13
    20   1.0760   3487.81     0.03     163.95     0.08
    21   1.0762   3483.79     0.16     164.08     0.15
    22   1.1469   1806.10    -0.09     176.13     0.01
    23   1.2835  -1526.91     0.10     194.43    -0.16
    24   1.2836  -1528.04    -0.06     194.43    -0.16
    25   1.3085  -1951.21    -0.08     197.23    -0.01
    26   1.3085  -1951.91     0.01     197.30     0.06
    27   1.3766  -2582.61    -0.03     203.70     0.02
    28   2.0098   9178.87    -0.03     300.87     0.08
    29   2.0236   9022.52    -0.00     303.73    -0.05

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.

15VU170    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        43.076    43.085    43.067
ecceobj         0.029     0.029     0.029
incobj          1.842     1.842     1.842
qmin           40.072    40.077    40.093
qmax           45.608    45.673    45.655
amean          42.768    42.777    42.759
amin           42.433    42.444    42.429
amax           43.100    43.120    43.102
emean           0.037     0.037     0.037
emin            0.017     0.017     0.016
emax            0.059     0.060     0.059
imean           1.329     1.325     1.335
imin            0.052     0.028     0.084
imax            2.006     2.005     2.009
excite_mean     0.045     0.046     0.045
fracstop        1.000     1.000     1.000
cjmean          3.084     3.085     3.084

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       172.2     171.7     172.6
kozaiamp        180.0     180.0     180.0