Orbit Fit and Astrometric record for 15GA58

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: 15GA58    
# Created Thu Dec  9 02:13:16 2021
# Orbit generated from Bernstein formalism
# Fitting     27 observations of     27
# Arc:   2.35y
# First observation: 2015/02/17
#  Last observation: 2017/06/24
Preliminary a, adot, b, bdot, g, gdot:
  -0.000138   0.028724   0.000003  -0.008946   0.027411   0.000000
# Chi-squared of fit:     4.15 DOF:     48 RMS:  0.07
# Min/Max residuals:    -0.37    0.12
# Exact a, adot, b, bdot, g, gdot:
  1.660364E-05  2.853850E-02 -5.246697E-06 -8.903727E-03  2.744849E-02 -2.127461E-03
# Covariance matrix:
  1.7295E-13 -6.1613E-14  1.7634E-15 -1.1877E-14  1.1248E-13  7.0188E-13
 -6.1613E-14  6.7727E-13  5.5016E-14 -2.7068E-13  2.3599E-13  1.5398E-11
  1.7634E-15  5.5016E-14  1.0264E-13 -1.0761E-13  2.4336E-14  1.5964E-12
 -1.1877E-14 -2.7068E-13 -1.0761E-13  2.8486E-13 -1.2417E-13 -7.8620E-12
  1.1248E-13  2.3599E-13  2.4336E-14 -1.2417E-13  2.4980E-13  7.1001E-12
  7.0188E-13  1.5398E-11  1.5964E-12 -7.8620E-12  7.1001E-12  4.4732E-10
#      lat0       lon0       xBary       yBary       zBary        JD0
    1.890161 -156.380779    0.810223    0.018633   -0.560352  2457071.077078
# Heliocentric elements and errors
Epoch:              2457070.5000  =  2015/02/17
Mean Anomaly:          328.47197 +/-     0.160
Argument of Peri:      215.85726 +/-     0.237
Long of Asc Node:       28.31376 +/-     0.000
Inclination:            17.39588 +/-     0.001
Eccentricity:         0.14935658 +/-    0.0005
Semi-Major Axis:     42.04276082 +/-    0.0057
Time of Perihelion: 2465790.7622 +/-      44.1
Perihelion:          35.76339805 +/-    0.0211
Aphelion:            48.32212358 +/-    0.0216
Period (y)              272.6120 +/-      0.06
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X          -34.20286301 +/-    0.0006
Ecliptic Y          -14.07096703 +/-    0.0003
Ecliptic Z            1.20146353 +/-    0.0000
Ecliptic XDOT         0.00130433 +/-    0.0000
Ecliptic YDOT        -0.00254044 +/-    0.0000
Ecliptic ZDOT        -0.00089453 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   37.00366827 +/-    0.0006
Geocenter to KBO     36.43188264 +/-    0.0007
# Hcoef:  7.33

The following table shows the complete astrometric record for 15GA58. 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 (15GA58) followed by the observatory code and reference code for the source of the astrometry.

2015 02  17.57630  13 30 15.469  -07 24 47.39  23.1r 15GA58    568  C~2nvY      
2015 02  17.61724  13 30 15.361  -07 24 46.92  23.1r 15GA58    568  C~2nvY      
2015 02  20.61032  13 30 07.459  -07 24 08.08  23.0r 15GA58    568  C~2nvY      
2015 03  18.55474  13 28 29.852  -07 15 57.05  22.9r 15GA58    568  C~2nvY      
2015 03  18.59568  13 28 29.662  -07 15 56.10  23.0r 15GA58    568  C~2nvY      
2015 04  11.49312  13 26 30.079  -07 05 59.01  22.9r 15GA58    568  C~2nvY      
2015 04  13.35741  13 26 20.329  -07 05 11.10  22.8r 15GA58    568  C~2nvY      
2015 04  13.39836  13 26 20.108  -07 05 10.03  22.8r 15GA58    568  C~2nvY      
2015 04  13.47268  13 26 19.710  -07 05 08.14  22.9r 15GA58    568  C~2nvY      
2015 04  13.47763  13 26 19.683  -07 05 07.96  22.9r 15GA58    568  C~2nvY      
2015 04  19.39819  13 25 48.680  -07 02 37.27  22.9r 15GA58    568  C~2nvY      
2015 04  19.50989  13 25 48.076  -07 02 34.45        15GA58    568  C~2nvY      
2015 04  19.51516  13 25 48.064  -07 02 34.35  22.8r 15GA58    568  C~2nvY      
2015 05  18.27253  13 23 29.960  -06 52 01.42  23.0r 15GA58    568  C~2nvY      
2015 06  20.27087  13 21 52.869  -06 46 39.83  22.9r 15GA58    568  C~2nvY      
2015 06  20.31175  13 21 52.814  -06 46 39.42  23.1r 15GA58    568  C~2nvY      
2015 06  22.31546  13 21 49.922  -06 46 38.59  23.2r 15GA58    568  C~2nvY      
2015 07  14.26780  13 21 43.696  -06 49 03.38  23.1r 15GA58    568  C~2nvY      
2016 02  04.57138  13 36 03.470  -08 30 55.88  23.2w 15GA58    568  C~2nvY      
2016 02  10.55937  13 35 55.198  -08 30 26.21  23.2w 15GA58    568  C~2nvY      
2016 02  10.60896  13 35 55.102  -08 30 25.99  23.3w 15GA58    568  C~2nvY      
2016 02  11.58117  13 35 53.423  -08 30 19.18  23.3w 15GA58    568  C~2nvY      
2016 03  11.56702  13 34 24.492  -08 23 26.31  23.2w 15GA58    568  C~2nvY      
2016 04  03.44126  13 32 35.948  -08 14 37.68  23.0w 15GA58    568  C~2nvY      
2016 04  09.42106  13 32 04.789  -08 12 06.53  23.1w 15GA58    568  C~2nvY      
2017 02  24.64250  13 40 49.244  -09 32 40.50        15GA58    568  C~2nvY      
2017 06  24.28972  13 32 31.287  -08 56 02.55  23.2w 15GA58    568  C~2nvY      

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     0.02
     2   0.0001     -1.67    -0.04      -0.15    -0.01
     3   0.0083   -125.26    -0.04      -7.24     0.07
     4   0.0793  -1656.21     0.00     -85.08    -0.00
     5   0.0795  -1659.19     0.02     -85.24     0.00
     6   0.1449  -3533.91    -0.04    -186.89    -0.04
     7   0.1500  -3686.52     0.12    -196.00     0.02
     8   0.1501  -3689.97     0.08    -196.22     0.03
     9   0.1503  -3696.18     0.07    -196.66     0.00
    10   0.1503  -3696.62     0.04    -196.64     0.05
    11   0.1665  -4181.32    -0.02    -227.24     0.04
    12   0.1668  -4190.73    -0.17    -227.94    -0.02
    13   0.1668  -4190.93     0.06    -227.92     0.04
    14   0.2456  -6336.85     0.04    -401.70     0.07
    15   0.3359  -7800.66    -0.04    -640.27    -0.37
    16   0.3360  -7801.58    -0.01    -640.19     0.04
    17   0.3415  -7841.94    -0.02    -655.45     0.03
    18   0.4016  -7874.25    -0.03    -824.46    -0.03
    19   0.9637   6265.31    -0.01   -1802.11     0.02
    20   0.9801   6140.11     0.03   -1819.18     0.04
    21   0.9802   6138.70    -0.04   -1819.49    -0.10
    22   0.9829   6113.00     0.05   -1822.23     0.00
    23   1.0623   4732.82    -0.05   -1919.02     0.04
    24   1.1249   3039.38     0.04   -2016.07     0.04
    25   1.1413   2553.47    -0.02   -2044.89     0.02
    26   2.0207  11565.48    -0.00   -3722.46    -0.03
    27   2.3483   3885.73     0.00   -4354.65     0.03

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.

15GA58    quality flag:2

Type:       SCATNEAR  SCATEXTD  SCATEXTD

axisobj        41.651    41.661    41.641
ecceobj         0.144     0.145     0.143
incobj         17.461    17.461    17.461
qmin           34.593    34.563    34.749
qmax           49.713    49.880    49.537
amean          41.940    41.945    41.942
amin           41.555    41.579    41.552
amax           42.396    42.402    42.370
emean           0.151     0.152     0.148
emin            0.130     0.129     0.128
emax            0.173     0.176     0.169
imean          16.413    16.413    16.494
imin           15.435    15.448    15.529
imax           17.445    17.357    17.457
excite_mean     0.321     0.321     0.320
fracstop        1.000     1.000     1.000
cjmean          2.956     2.956     2.956

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       183.9     184.6     181.7
kozaiamp        180.0     180.0     180.0