Orbit Fit and Astrometric record for 15VP173

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: 15VP173   
# Created Tue Apr  1 01:10:43 2025
# Orbit generated from Bernstein formalism
# Fitting     30 observations of     30
# Arc:   1.46y
# First observation: 2015/08/11
#  Last observation: 2017/01/26
Preliminary a, adot, b, bdot, g, gdot:
  -0.000091   0.019844  -0.000006   0.000583   0.021927   0.000000
# Chi-squared of fit:     5.46 DOF:     54 RMS:  0.08
# Min/Max residuals:    -0.17    0.18
# Exact a, adot, b, bdot, g, gdot:
  1.374435E-05  1.947480E-02  9.955829E-11  5.738142E-04  2.163890E-02  4.729523E-05
# Covariance matrix:
  3.3961E-13  4.0793E-14  1.1319E-14  8.4474E-16  3.6072E-13  1.6360E-11
  4.0793E-14  3.0962E-13  8.2761E-15  9.0903E-16  2.8118E-13  1.5210E-11
  1.1319E-14  8.2761E-15  1.2441E-13 -1.1723E-13  1.8902E-14  8.5471E-13
  8.4474E-16  9.0903E-16 -1.1723E-13  1.7993E-13  1.7658E-15  1.3136E-13
  3.6072E-13  2.8118E-13  1.8902E-14  1.7658E-15  6.2365E-13  3.1281E-11
  1.6360E-11  1.5210E-11  8.5471E-13  1.3136E-13  3.1281E-11  1.9886E-09
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.013631   50.150963    1.015488    0.001627    0.028568  2457246.085349
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:          203.62662 +/-     1.996
Argument of Peri:       97.02608 +/-     1.995
Long of Asc Node:      110.66391 +/-     0.018
Inclination:             3.42099 +/-     0.001
Eccentricity:         0.05766040 +/-    0.0008
Semi-Major Axis:     43.85487595 +/-    0.0048
Time of Perihelion: 2503317.6480 +/-     588.0
Perihelion:          41.32618620 +/-    0.0361
Aphelion:            46.38356570 +/-    0.0362
Period (y)              290.4257 +/-      0.05
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           30.32813890 +/-    0.0011
Ecliptic Y           34.75762673 +/-    0.0013
Ecliptic Z           -2.42955251 +/-    0.0001
Ecliptic XDOT        -0.00188751 +/-    0.0000
Ecliptic YDOT         0.00158004 +/-    0.0000
Ecliptic ZDOT         0.00007224 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   46.19297945 +/-    0.0012
Geocenter to KBO     46.21306538 +/-    0.0017
# Hcoef:  7.77

The following table shows the complete astrometric record for 15VP173. 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 (15VP173) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.58456  03 14 10.070  +14 52 34.03  24.7w 15VP173   568  C~2nwI      
2015 09  06.63168  03 14 04.712  +14 50 35.77  25.0w 15VP173   568  C~2nwI      
2015 09  12.52133  03 13 55.683  +14 49 39.75  25.0w 15VP173   568  C~2nwI      
2015 10  07.45992  03 12 49.184  +14 44 05.06  24.5w 15VP173   568  C~2nwI      
2015 10  08.46335  03 12 45.684  +14 43 48.85  24.7w 15VP173   568  C~2nwI      
2015 10  08.52236  03 12 45.456  +14 43 48.02  24.8w 15VP173   568  C~2nwI      
2015 11  07.36952  03 10 42.402  +14 35 01.26  24.4r 15VP173   568  C~2nwI      
2015 11  07.41164  03 10 42.216  +14 35 00.46  24.1r 15VP173   568  C~2nwI      
2015 11  07.45387  03 10 42.024  +14 34 59.68  24.2r 15VP173   568  C~2nwI      
2015 11  10.54061  03 10 28.073  +14 34 03.82  24.3w 15VP173   568  C~2nwI      
2015 11  17.38710  03 09 57.148  +14 32 01.94  24.5w 15VP173   568  C~2nwI      
2015 11  17.43381  03 09 56.934  +14 32 01.12  24.6w 15VP173   568  C~2nwI      
2015 12  06.39596  03 08 34.857  +14 26 55.78  24.7w 15VP173   568  C~2nwI      
2015 12  13.33048  03 08 07.758  +14 25 22.02  24.6w 15VP173   568  C~2nwI      
2015 12  13.38903  03 08 07.528  +14 25 21.13  24.5w 15VP173   568  C~2nwI      
2016 01  01.38342  03 07 06.856  +14 22 13.79  24.5w 15VP173   568  C~2nwI      
2016 01  02.34977  03 07 04.402  +14 22 07.35  24.6w 15VP173   568  C~2nwI      
2016 02  10.29646  03 06 29.713  +14 22 32.99  24.9w 15VP173   568  C~2nwI      
2016 09  06.59818  03 18 31.430  +15 10 03.22  24.8w 15VP173   568  C~2nwI      
2016 09  26.59251  03 17 50.397  +15 06 21.63  24.6w 15VP173   568  C~2nwI      
2016 10  10.39652  03 17 05.932  +15 02 55.93  24.6w 15VP173   568  C~2nwI      
2016 10  10.45485  03 17 05.713  +15 02 54.97  24.5w 15VP173   568  C~2nwI      
2016 11  02.54312  03 15 31.026  +14 56 16.83  24.5w 15VP173   568  C~2nwI      
2016 11  02.54892  03 15 31.004  +14 56 16.70  24.7w 15VP173   568  C~2nwI      
2016 11  04.41826  03 15 22.665  +14 55 43.38  24.4w 15VP173   568  C~2nwI      
2016 11  04.42405  03 15 22.637  +14 55 43.27  24.6w 15VP173   568  C~2nwI      
2016 12  29.38526  03 11 40.481  +14 42 38.59  24.8w 15VP173   568  C~2nwI      
2017 01  02.39267  03 11 29.743  +14 42 10.19  24.7w 15VP173   568  C~2nwI      
2017 01  26.30729  03 10 52.134  +14 41 18.06  24.6w 15VP173   568  C~2nwI      
2017 01  26.31474  03 10 52.133  +14 41 18.23  24.6w 15VP173   568  C~2nwI      

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     0.10       0.00     0.09
     2   0.0713   -106.12    -0.15     -93.58    -0.06
     3   0.0874   -247.19    -0.05    -113.07    -0.02
     4   0.1557  -1265.86    -0.04    -180.65     0.03
     5   0.1585  -1319.12     0.04    -182.82    -0.05
     6   0.1586  -1322.53    -0.14    -182.74     0.12
     7   0.2403  -3184.30     0.08    -214.88     0.08
     8   0.2405  -3187.12     0.16    -214.93     0.02
     9   0.2406  -3190.01     0.18    -214.94     0.00
    10   0.2490  -3400.16    -0.07    -214.58     0.08
    11   0.2678  -3865.54     0.05    -211.70    -0.12
    12   0.2679  -3868.75     0.05    -211.65    -0.12
    13   0.3198  -5099.53     0.02    -185.17    -0.07
    14   0.3388  -5504.14     0.12    -169.20     0.03
    15   0.3390  -5507.60     0.00    -169.15    -0.09
    16   0.3910  -6407.66    -0.10    -110.88     0.03
    17   0.3936  -6443.76    -0.17    -107.40     0.05
    18   0.5002  -6922.41    -0.11      54.24    -0.02
    19   1.0733   3929.50    -0.05      23.13    -0.01
    20   1.1280   3298.03    -0.05     -36.80     0.05
    21   1.1658   2622.53     0.01     -67.89    -0.03
    22   1.1660   2619.22    -0.05     -67.99    -0.04
    23   1.2292   1190.77     0.02     -93.66    -0.01
    24   1.2292   1190.43     0.07     -93.70    -0.05
    25   1.2343   1065.06     0.03     -94.15     0.01
    26   1.2343   1064.64     0.00     -94.15     0.01
    27   1.3848  -2249.78     0.07       0.90    -0.03
    28   1.3958  -2407.52    -0.06      15.05     0.07
    29   1.4613  -2947.41    -0.03     110.48    -0.05
    30   1.4613  -2947.38     0.06     110.64     0.09

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.

15VP173    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.247    44.257    44.238
ecceobj         0.048     0.049     0.047
incobj          3.423     3.423     3.423
qmin           40.878    40.809    40.879
qmax           47.206    47.262    47.160
amean          43.944    43.954    43.935
amin           43.603    43.608    43.598
amax           44.299    44.316    44.292
emean           0.050     0.052     0.050
emin            0.034     0.035     0.033
emax            0.066     0.067     0.066
imean           1.901     1.901     1.902
imin            1.176     1.174     1.178
imax            2.564     2.566     2.564
excite_mean     0.061     0.062     0.060
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       188.1     188.2     188.2
kozaiamp        180.0     180.0     179.9