Orbit Fit and Astrometric record for 15VS173

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: 15VS173   
# Created Fri Dec  3 02:13:44 2021
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   2.12y
# First observation: 2015/08/11
#  Last observation: 2017/09/22
Preliminary a, adot, b, bdot, g, gdot:
  -0.000137   0.019840  -0.000020  -0.003922   0.021991   0.000000
# Chi-squared of fit:    17.63 DOF:     48 RMS:  0.14
# Min/Max residuals:    -0.33    0.32
# Exact a, adot, b, bdot, g, gdot:
  1.508635E-05  1.958656E-02 -2.819798E-06 -3.895875E-03  2.181667E-02  3.132821E-03
# Covariance matrix:
  2.7375E-13  1.6270E-14  1.7014E-14 -3.3929E-14  2.1615E-13  3.9036E-12
  1.6270E-14  3.9822E-13  2.9599E-14 -8.9699E-14  2.4028E-13  1.0338E-11
  1.7014E-14  2.9599E-14  1.0842E-13 -9.7140E-14  3.2726E-14  1.1971E-12
 -3.3929E-14 -8.9699E-14 -9.7140E-14  1.7697E-13 -8.2753E-14 -3.6703E-12
  2.1615E-13  2.4028E-13  3.2726E-14 -8.2753E-14  3.3835E-13  9.5313E-12
  3.9036E-12  1.0338E-11  1.1971E-12 -3.6703E-12  9.5313E-12  4.2304E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
   -3.500538   50.329947    1.015394    0.002064    0.031719  2457246.085349
# Heliocentric elements and errors
Epoch:              2457240.5000  =  2015/08/06
Mean Anomaly:           85.18981 +/-     0.135
Argument of Peri:       97.08240 +/-     0.095
Long of Asc Node:      212.07536 +/-     0.002
Inclination:            11.83269 +/-     0.001
Eccentricity:         0.13143814 +/-    0.0010
Semi-Major Axis:     45.52833808 +/-    0.0129
Time of Perihelion: 2430687.9469 +/-      40.7
Perihelion:          39.54417783 +/-    0.0460
Aphelion:            51.51249834 +/-    0.0469
Period (y)              307.2069 +/-      0.13
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           29.96308710 +/-    0.0008
Ecliptic Y           34.54337254 +/-    0.0009
Ecliptic Z           -2.79877882 +/-    0.0001
Ecliptic XDOT        -0.00166260 +/-    0.0000
Ecliptic YDOT         0.00184182 +/-    0.0000
Ecliptic ZDOT        -0.00051194 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   45.81336419 +/-    0.0009
Geocenter to KBO     45.83650550 +/-    0.0012
# Hcoef:  8.50

The following table shows the complete astrometric record for 15VS173. 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 (15VS173) followed by the observatory code and reference code for the source of the astrometry.

2015 08  11.58456  03 15 24.606  +14 27 12.03  25.1w 15VS173   568  C~2nwI      
2015 09  06.63168  03 15 21.069  +14 23 54.18        15VS173   568  C~2nwI      
2015 09  12.52133  03 15 12.409  +14 22 40.44  25.8w 15VS173   568  C~2nwI      
2015 10  07.45992  03 14 07.148  +14 15 51.05  25.3w 15VS173   568  C~2nwI      
2015 10  08.46335  03 14 03.663  +14 15 32.05  25.4w 15VS173   568  C~2nwI      
2015 10  08.52236  03 14 03.486  +14 15 30.79  25.1w 15VS173   568  C~2nwI      
2015 11  07.36952  03 12 01.353  +14 05 21.66  24.6r 15VS173   568  C~2nwI      
2015 11  07.41164  03 12 01.136  +14 05 20.72  25.1r 15VS173   568  C~2nwI      
2015 11  07.45387  03 12 00.940  +14 05 19.93  24.9r 15VS173   568  C~2nwI      
2015 11  10.54061  03 11 47.073  +14 04 16.29  25.0w 15VS173   568  C~2nwI      
2015 11  17.38710  03 11 16.276  +14 01 57.38  24.9w 15VS173   568  C~2nwI      
2015 11  17.43381  03 11 16.060  +14 01 56.54  25.2w 15VS173   568  C~2nwI      
2015 12  06.39596  03 09 54.290  +13 56 07.00  25.4w 15VS173   568  C~2nwI      
2015 12  13.33048  03 09 27.263  +13 54 18.30  25.1w 15VS173   568  C~2nwI      
2015 12  13.38903  03 09 27.068  +13 54 17.30  25.2w 15VS173   568  C~2nwI      
2016 01  01.38342  03 08 26.620  +13 50 32.32  25.7w 15VS173   568  C~2nwI      
2016 01  02.34977  03 08 24.155  +13 50 24.00  25.8w 15VS173   568  C~2nwI      
2016 01  07.33018  03 08 12.690  +13 49 46.46  25.7w 15VS173   568  C~2nwI      
2016 02  05.27611  03 07 47.018  +13 49 15.70  25.5w 15VS173   568  C~2nwI      
2016 02  10.29646  03 07 50.097  +13 49 42.47  25.6w 15VS173   568  C~2nwI      
2016 11  02.54312  03 17 07.410  +14 11 40.30        15VS173   568  C~2nwI      
2016 11  04.41826  03 16 59.121  +14 11 02.01        15VS173   568  C~2nwI      
2016 12  29.38526  03 13 18.389  +13 56 02.87  25.2w 15VS173   568  C~2nwI      
2017 01  02.39267  03 13 07.731  +13 55 28.18  25.4w 15VS173   568  C~2nwI      
2017 01  26.31474  03 12 30.384  +13 54 01.38  25.3w 15VS173   568  C~2nwI      
2017 09  15.59463  03 24 34.403  +14 30 39.58  24.9w 15VS173   568  C~2nwI      
2017 09  22.58081  03 24 19.867  +14 28 57.14  26.0w 15VS173   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    -0.18       0.00    -0.00
     2   0.0713   -101.47    -0.33    -177.45    -0.15
     3   0.0874   -242.24     0.08    -215.59     0.09
     4   0.1557  -1265.03     0.12    -361.11     0.05
     5   0.1585  -1318.91    -0.13    -366.09     0.19
     6   0.1586  -1321.73     0.30    -366.62    -0.07
     7   0.2403  -3196.07     0.32    -483.91    -0.16
     8   0.2405  -3199.36    -0.05    -483.97    -0.12
     9   0.2406  -3202.32    -0.08    -483.98    -0.03
    10   0.2490  -3413.79    -0.07    -491.69     0.12
    11   0.2678  -3882.88    -0.06    -506.29     0.03
    12   0.2679  -3886.14    -0.08    -506.26     0.13
    13   0.3198  -5127.06     0.06    -525.09    -0.02
    14   0.3388  -5535.57    -0.05    -524.31     0.09
    15   0.3390  -5538.58     0.31    -524.51    -0.15
    16   0.3910  -6447.69     0.29    -504.55     0.03
    17   0.3936  -6484.54    -0.11    -502.89     0.08
    18   0.4072  -6655.64    -0.23    -494.03    -0.19
    19   0.4865  -7024.40     0.00    -422.73     0.14
    20   0.5002  -6973.93    -0.19    -409.05     0.05
    21   1.2292   1198.74     0.21   -1289.84    -0.04
    22   1.2343   1072.38     0.15   -1295.41     0.04
    23   1.3848  -2262.98    -0.19   -1319.96    -0.08
    24   1.3958  -2421.82     0.02   -1312.38     0.01
    25   1.4613  -2969.26    -0.04   -1252.04    -0.15
    26   2.0972   7773.13    -0.13   -1855.69     0.01
    27   2.1163   7542.68     0.05   -1901.46     0.12

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.

15VS173    quality flag:3

Type:       SCATEXTD  SCATEXTD  SCATEXTD

axisobj        45.999    46.040    45.960
ecceobj         0.135     0.138     0.133
incobj         11.772    11.772    11.773
qmin           38.928    38.875    39.048
qmax           52.690    52.817    52.454
amean          45.652    45.691    45.611
amin           45.271    45.322    45.229
amax           46.076    46.105    46.020
emean           0.131     0.133     0.128
emin            0.118     0.120     0.115
emax            0.144     0.146     0.141
imean          12.749    12.754    12.747
imin           12.260    12.260    12.260
imax           13.168    13.176    13.167
excite_mean     0.257     0.258     0.255
fracstop        1.000     1.000     1.000
cjmean          3.040     3.040     3.041

libcent 0      -180.0    -180.0     149.0
libamp  0      -180.0    -180.0      46.2
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       178.0     177.9     177.9
kozaiamp        180.0     180.0     180.0