Orbit Fit and Astrometric record for 15VU171

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: 15VU171   
# Created Tue Apr  1 01:10:42 2025
# Orbit generated from Bernstein formalism
# Fitting     34 observations of     34
# Arc:   2.12y
# First observation: 2015/08/11
#  Last observation: 2017/09/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000088   0.023067  -0.000002   0.000832   0.023709   0.000000
# Chi-squared of fit:     4.69 DOF:     62 RMS:  0.07
# Min/Max residuals:    -0.21    0.14
# Exact a, adot, b, bdot, g, gdot:
  1.514140E-05  2.264899E-02  7.177551E-07  8.182584E-04  2.335712E-02  5.875634E-04
# Covariance matrix:
  2.1415E-13 -2.5980E-14  2.6302E-15  2.0638E-15  1.5078E-13  2.0290E-12
 -2.5980E-14  2.9522E-13  9.2195E-16  7.5266E-15  1.6997E-13  6.7059E-12
  2.6302E-15  9.2195E-16  1.0228E-13 -7.8622E-14  3.3570E-15  3.6878E-14
  2.0638E-15  7.5266E-15 -7.8622E-14  1.0249E-13  6.6380E-15  2.6150E-13
  1.5078E-13  1.6997E-13  3.3570E-15  6.6380E-15  2.6138E-13  6.1178E-12
  2.0290E-12  6.7059E-12  3.6878E-14  2.6150E-13  6.1178E-12  2.3338E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.631450   51.771572    1.014259    0.001763    0.057646  2457246.064839
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:          359.83931 +/-     2.022
Argument of Peri:      321.30315 +/-     2.100
Long of Asc Node:       89.23119 +/-     0.011
Inclination:             2.60450 +/-     0.001
Eccentricity:         0.01872654 +/-    0.0001
Semi-Major Axis:     43.58138271 +/-    0.0028
Time of Perihelion: 2457287.4062 +/-     590.2
Perihelion:          42.76525421 +/-    0.0037
Aphelion:            44.39751120 +/-    0.0037
Period (y)              287.7131 +/-      0.03
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           27.23920729 +/-    0.0006
Ecliptic Y           32.94551837 +/-    0.0007
Ecliptic Z           -1.21884960 +/-    0.0000
Ecliptic XDOT        -0.00204328 +/-    0.0000
Ecliptic YDOT         0.00169269 +/-    0.0000
Ecliptic ZDOT         0.00009397 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.76525680 +/-    0.0007
Geocenter to KBO     42.81349173 +/-    0.0009
# Hcoef:  7.52

The following table shows the complete astrometric record for 15VU171. 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 (15VU171) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.56405  03 19 10.228  +16 37 55.76  24.1w 15VU171   568  C~2nwA      
2015 09  06.61072  03 19 09.060  +16 37 01.96  24.0w 15VU171   568  C~2nwA      
2015 09  12.50083  03 19 00.212  +16 36 17.74  24.2w 15VU171   568  C~2nwA      
2015 10  07.42237  03 17 51.492  +16 31 19.21  24.1w 15VU171   568  C~2nwA      
2015 10  08.43421  03 17 47.761  +16 31 03.87  24.1w 15VU171   568  C~2nwA      
2015 10  08.49327  03 17 47.539  +16 31 03.03  24.1w 15VU171   568  C~2nwA      
2015 11  07.34317  03 15 36.153  +16 22 21.57  23.9r 15VU171   568  C~2nwA      
2015 11  07.38533  03 15 35.944  +16 22 20.80  23.9r 15VU171   568  C~2nwA      
2015 11  07.42748  03 15 35.737  +16 22 19.90  23.3r 15VU171   568  C~2nwB      
2015 11  10.51130  03 15 20.722  +16 21 22.29  23.8w 15VU171   568  C~2nwB      
2015 11  17.35801  03 14 47.312  +16 19 15.17  24.0w 15VU171   568  C~2nwB      
2015 11  17.40462  03 14 47.077  +16 19 14.30  23.9w 15VU171   568  C~2nwB      
2015 12  06.36680  03 13 17.951  +16 13 44.62  24.0w 15VU171   568  C~2nwB      
2015 12  06.51621  03 13 17.275  +16 13 42.35  24.1w 15VU171   568  C~2nwB      
2015 12  13.30120  03 12 48.362  +16 11 59.01  24.0w 15VU171   568  C~2nwB      
2015 12  13.35972  03 12 48.120  +16 11 58.21  24.0w 15VU171   568  C~2nwB      
2016 01  01.35451  03 11 41.534  +16 08 14.07  24.1w 15VU171   568  C~2nwB      
2016 01  07.30127  03 11 26.074  +16 07 27.31  23.8w 15VU171   568  C~2nwB      
2016 02  04.33458  03 10 55.906  +16 06 45.25  24.0w 15VU171   568  C~2nwB      
2016 09  07.56206  03 24 21.354  +16 59 31.38        15VU171   568  C~2nwB      
2016 09  26.62090  03 23 41.236  +16 56 33.38  24.2w 15VU171   568  C~2nwB      
2016 10  10.43747  03 22 54.697  +16 53 24.36  24.1w 15VU171   568  C~2nwB      
2016 10  10.49616  03 22 54.463  +16 53 23.48  24.1w 15VU171   568  C~2nwB      
2016 10  10.51394  03 22 54.396  +16 53 23.25  24.1w 15VU171   568  C~2nwB      
2016 11  02.51995  03 21 13.878  +16 46 55.29  24.0w 15VU171   568  C~2nwB      
2016 11  04.39506  03 21 04.901  +16 46 21.45  24.1w 15VU171   568  C~2nwB      
2016 12  24.31334  03 17 19.647  +16 32 58.92  24.0w 15VU171   568  C~2nwB      
2016 12  24.33186  03 17 19.571  +16 32 58.86  24.1w 15VU171   568  C~2nwB      
2017 01  02.41556  03 16 50.924  +16 31 28.56  23.9w 15VU171   568  C~2nwB      
2017 01  02.43457  03 16 50.867  +16 31 28.49  24.1w 15VU171   568  C~2nwB      
2017 01  27.28684  03 16 07.975  +16 29 47.61  24.1w 15VU171   568  C~2nwB      
2017 09  15.58250  03 29 24.845  +17 20 45.44  24.2w 15VU171   568  C~2nwB      
2017 09  21.62755  03 29 11.997  +17 19 50.20  24.3w 15VU171   568  C~2nwB      
2017 09  22.56874  03 29 09.745  +17 19 40.98  24.0w 15VU171   568  C~2nwB      

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     0.04       0.00    -0.03
     2   0.0713    -30.05    -0.06     -47.68     0.03
     3   0.0874   -164.32    -0.06     -57.73    -0.04
     4   0.1557  -1195.92    -0.02     -91.48    -0.06
     5   0.1584  -1251.72    -0.06     -92.42    -0.01
     6   0.1586  -1255.02    -0.02     -92.41     0.03
     7   0.2403  -3216.01     0.14    -104.79     0.03
     8   0.2404  -3219.11     0.12    -104.74     0.05
     9   0.2406  -3222.22     0.10    -104.84    -0.07
    10   0.2490  -3445.93    -0.08    -103.97    -0.04
    11   0.2677  -3943.51     0.04    -100.76    -0.03
    12   0.2679  -3947.00    -0.02    -100.71    -0.03
    13   0.3198  -5272.51     0.01     -81.26    -0.03
    14   0.3202  -5282.51    -0.03     -80.88     0.12
    15   0.3388  -5711.77    -0.06     -70.53    -0.06
    16   0.3389  -5715.34    -0.01     -70.38    -0.03
    17   0.3909  -6700.62     0.02     -32.15     0.00
    18   0.4072  -6928.05    -0.05     -17.98     0.03
    19   0.4840  -7358.79    -0.02      57.33     0.09
    20   1.0760   4650.73     0.05     119.68    -0.01
    21   1.1282   4048.64    -0.02      91.82     0.10
    22   1.1660   3354.46     0.02      77.10     0.00
    23   1.1661   3350.99    -0.05      77.10     0.02
    24   1.1662   3350.00    -0.00      77.12     0.05
    25   1.2292   1855.40    -0.04      67.46    -0.00
    26   1.2343   1722.10     0.02      67.55    -0.01
    27   1.3710  -1612.46     0.12     123.35    -0.12
    28   1.3710  -1613.53     0.02     123.57     0.06
    29   1.3959  -2034.82    -0.07     143.22    -0.03
    30   1.3959  -2035.63    -0.08     143.36     0.07
    31   1.4640  -2657.57     0.04     206.42     0.01
    32   2.0972   9185.50     0.13     278.16     0.05
    33   2.1138   8993.24    -0.21     269.53    -0.17
    34   2.1164   8959.65     0.08     268.48     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.

15VU171    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.000    44.010    43.991
ecceobj         0.028     0.028     0.028
incobj          2.603     2.603     2.603
qmin           41.489    41.475    41.495
qmax           45.997    46.044    46.008
amean          43.665    43.674    43.655
amin           43.333    43.329    43.321
amax           44.011    44.016    44.001
emean           0.030     0.030     0.030
emin            0.011     0.012     0.010
emax            0.046     0.046     0.046
imean           1.030     1.031     1.030
imin            0.130     0.133     0.128
imax            1.622     1.620     1.623
excite_mean     0.036     0.036     0.035
fracstop        1.000     1.000     1.000
cjmean          3.096     3.096     3.096

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       167.0     168.0     165.9
kozaiamp        180.0     179.9     179.9