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: 15GN55
# Created Mon Jul 7 01:10:35 2025
# Orbit generated by ELGB
# -->Covariance matrix from a Bernstein fit
# Fitting 41 observations of 41
# Arc: 10.20y
# First observation: 2015/02/17
# Last observation: 2025/05/02
# Chi-squared of fit: 21.53 DOF: 76 RMS: 0.13
# Min/Max residuals: -0.29 0.64
# Exact a, adot, b, bdot, g, gdot:
9.125989E-06 8.174324E-03 2.107776E-06 1.160501E-03 1.395978E-02 -2.424590E-03
# Covariance matrix:
1.3437E-13 -2.9738E-14 2.4021E-15 -3.4762E-15 6.8399E-14 -2.7377E-13
-2.9738E-14 6.8486E-14 -8.1119E-15 1.0653E-14 4.2995E-14 8.5859E-13
2.4021E-15 -8.1119E-15 5.7733E-14 -8.9191E-15 -5.7004E-15 -1.0609E-13
-3.4762E-15 1.0653E-14 -8.9191E-15 4.5213E-15 7.1063E-15 1.3926E-13
6.8399E-14 4.2995E-14 -5.7004E-15 7.1063E-15 1.2603E-13 5.8029E-13
-2.7377E-13 8.5859E-13 -1.0609E-13 1.3926E-13 5.8029E-13 1.1225E-11
# lat0 lon0 xBary yBary zBary JD0
1.842974 -158.065720 0.793472 0.018927 -0.583820 2457071.068908
# Heliocentric elements and errors
Epoch: 2457070.5000 = 2015/02/17
Mean Anomaly: 237.98230 +/- 0.042
Argument of Peri: 164.69502 +/- 0.031
Long of Asc Node: 188.67104 +/- 0.001
Inclination: 8.30281 +/- 0.000
Eccentricity: 0.40934258 +/- 0.0001
Semi-Major Axis: 55.42414337 +/- 0.0072
Time of Perihelion: 2508152.4254 +/- 26.4
Perihelion: 32.73668152 +/- 0.0091
Aphelion: 78.11160521 +/- 0.0130
Period (y) 412.6261 +/- 0.08
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -67.25558428 +/- 0.0017
Ecliptic Y -26.22682219 +/- 0.0007
Ecliptic Z 2.30394199 +/- 0.0001
Ecliptic XDOT 0.00104287 +/- 0.0000
Ecliptic YDOT -0.00131243 +/- 0.0000
Ecliptic ZDOT 0.00021228 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 72.22532148 +/- 0.0016
Geocenter to KBO 71.63456543 +/- 0.0018
# Hcoef: 5.90
The following table shows the complete astrometric record for 15GN55. 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 (15GN55) followed by the observatory code and reference code for the source of the astrometry.
2015 02 17.56813 13 23 52.775 -06 50 04.51 24.4r 15GN55 568 C~2lVB 2015 02 17.60905 13 23 52.706 -06 50 03.92 24.4r 15GN55 568 C~2lVB 2015 02 20.60184 13 23 48.051 -06 49 29.88 24.3r 15GN55 568 C~2lVB 2015 03 18.54653 13 22 53.530 -06 43 18.41 24.0r 15GN55 568 C~2lVB 2015 03 18.58746 13 22 53.428 -06 43 17.72 24.2r 15GN55 568 C~2lVB 2015 03 20.55033 13 22 48.480 -06 42 45.35 24.4r 15GN55 568 C~2lVB 2015 04 11.48481 13 21 49.200 -06 36 27.07 24.5r 15GN55 568 C~2lVB 2015 04 13.34921 13 21 44.008 -06 35 54.74 24.3r 15GN55 568 C~2lVB 2015 04 13.39016 13 21 43.889 -06 35 53.94 24.6r 15GN55 568 C~2lVB 2015 04 13.45967 13 21 43.698 -06 35 52.87 24.3r 15GN55 568 C~2lVB 2015 04 19.39003 13 21 27.188 -06 34 10.28 24.6r 15GN55 568 C~2lVB 2015 05 18.25525 13 20 13.503 -06 26 45.23 24.2r 15GN55 568 C~2lVB 2015 06 22.30724 13 19 18.837 -06 21 38.45 24.5r 15GN55 568 C~2lVB 2015 07 20.26062 13 19 16.013 -06 21 48.19 24.4r 15GN55 568 C~2lVB 2016 02 04.54710 13 25 59.823 -06 58 52.33 24.7w 15GN55 568 C~2lVB 2016 02 10.53503 13 25 53.960 -06 58 03.51 24.4w 15GN55 568 C~2lVB 2016 03 11.53623 13 25 00.698 -06 51 46.82 24.5w 15GN55 568 C~2lVB 2016 04 03.42508 13 24 01.599 -06 45 24.05 24.5w 15GN55 568 C~2lVB 2016 04 09.40482 13 23 44.964 -06 43 39.54 24.5w 15GN55 568 C~2lVB 2016 05 01.35239 13 22 44.666 -06 37 28.96 24.6w 15GN55 568 C~2lVB 2016 05 02.29500 13 22 42.180 -06 37 14.17 24.8w 15GN55 568 C~2lVB 2016 05 06.30476 13 22 31.861 -06 36 12.03 24.5w 15GN55 568 C~2lVB 2016 05 28.26791 13 21 42.805 -06 31 25.07 24.5w 15GN55 568 C~2lVB 2016 06 04.34936 13 21 30.477 -06 30 15.68 24.8w 15GN55 568 C~2lVB 2016 06 27.26867 13 21 05.572 -06 28 06.14 24.5w 15GN55 568 C~2lVB 2016 07 06.30443 13 21 02.700 -06 27 58.06 24.7w 15GN55 568 C~2lVB 2017 02 24.62428 13 27 24.739 -07 02 10.33 15GN55 568 C~2lVB 2017 02 24.63510 13 27 24.719 -07 02 10.16 15GN55 568 C~2lVB 2017 03 28.55556 13 26 11.132 -06 54 00.28 15GN55 568 C~2lVB 2017 06 21.28313 13 23 01.307 -06 35 12.85 24.6w 15GN55 568 C~2lVB 2017 07 26.25161 13 23 01.303 -06 35 50.65 23.9w 15GN55 568 C~2lVB 2017 07 27.26646 13 23 02.242 -06 35 56.84 15GN55 568 C~2lVB 2022 04 08.261180 13 35 14.680 -07 25 05.12 24.4G 15GN55 G37 C~5ZbH 2022 04 08.342420 13 35 14.456 -07 25 04.27 15GN55 G37 C~5ZbH 2024 03 16.36606 13 40 06.805 -07 44 57.55 24.9r 15GN55 W84 C~8vFa 2024 03 17.36291 13 40 04.393 -07 44 41.58 24.8r 15GN55 W84 C~8vFa 2025 03 04.30531 13 42 31.331 -07 54 46.76 24.8r 15GN55 269 C~8vFa 2025 03 04.34369 13 42 31.255 -07 54 46.32 24.8r 15GN55 269 C~8vFa 2025 05 02.06641 13 39 56.095 -07 38 39.68 15GN55 269 C~8vFa 2025 05 02.12353 13 39 55.931 -07 38 38.81 15GN55 269 C~8vFa 2025 05 02.20894 13 39 55.690 -07 38 37.51 15GN55 269 C~8vFa
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 -0.16
2 0.0001 0.00 -0.13 0.00 -0.02
3 0.0083 0.00 -0.06 0.00 -0.00
4 0.0793 0.00 -0.02 0.00 0.00
5 0.0795 0.00 0.01 0.00 0.02
6 0.0848 0.00 -0.02 0.00 0.04
7 0.1449 0.00 0.02 0.00 0.07
8 0.1500 0.00 0.08 0.00 -0.10
9 0.1501 0.00 0.04 0.00 -0.01
10 0.1503 0.00 0.13 0.00 -0.15
11 0.1665 0.00 -0.01 0.00 0.02
12 0.2455 0.00 -0.19 0.00 0.10
13 0.3415 0.00 0.03 0.00 0.00
14 0.4180 0.00 0.00 0.00 0.05
15 0.9637 0.00 0.03 0.00 -0.06
16 0.9801 0.00 -0.08 0.00 0.05
17 1.0622 0.00 0.01 0.00 -0.14
18 1.1249 0.00 0.05 0.00 -0.01
19 1.1412 0.00 -0.03 0.00 -0.05
20 1.2013 0.00 0.23 0.00 0.07
21 1.2039 0.00 -0.03 0.00 -0.03
22 1.2149 0.00 0.08 0.00 0.18
23 1.2750 0.00 -0.04 0.00 0.00
24 1.2944 0.00 -0.01 0.00 -0.02
25 1.3572 0.00 -0.25 0.00 0.01
26 1.3819 0.00 -0.13 0.00 0.00
27 2.0207 0.00 -0.08 0.00 -0.06
28 2.0207 0.00 -0.09 0.00 -0.03
29 2.1081 0.00 -0.05 0.00 0.05
30 2.3401 0.00 0.08 0.00 -0.01
31 2.4358 0.00 -0.01 0.00 -0.17
32 2.4386 0.00 0.20 0.00 0.25
33 7.1367 0.00 0.11 0.00 0.64
34 7.1370 0.00 0.24 0.00 0.07
35 9.0754 0.00 -0.29 0.00 -0.28
36 9.0782 0.00 -0.23 0.00 -0.12
37 10.0417 0.00 0.16 0.00 0.03
38 10.0418 0.00 0.18 0.00 -0.06
39 10.2026 0.00 0.00 0.00 0.01
40 10.2028 0.00 -0.04 0.00 -0.04
41 10.2030 0.00 -0.04 0.00 -0.11
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.
15GN55 quality flag:3 Type: 5:2EEE 5:2EEE 5:2EEE axisobj 55.040 55.040 55.041 ecceobj 0.418 0.418 0.418 incobj 8.371 8.371 8.371 qmin 31.832 31.832 31.832 qmax 80.290 80.296 80.284 amean 55.462 55.462 55.462 amin 54.771 54.771 54.770 amax 56.362 56.365 56.359 emean 0.413 0.413 0.413 emin 0.402 0.402 0.402 emax 0.425 0.425 0.425 imean 8.438 8.438 8.438 imin 8.089 8.089 8.089 imax 8.758 8.758 8.758 excite_mean 0.438 0.438 0.438 fracstop 1.000 1.000 1.000 cjmean 2.988 2.988 2.988 libcent 0 181.7 181.7 181.8 libamp 0 73.0 73.1 73.0 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 223.2 223.2 223.2 kozaiamp 66.3 66.3 66.3