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: 15FA490 # Created Mon Apr 28 01:10:23 2025 # Orbit generated from Bernstein formalism # Fitting 24 observations of 25 # Arc: 1.01y # First observation: 2014/03/25 # Last observation: 2015/03/29 Preliminary a, adot, b, bdot, g, gdot: -0.000018 0.038739 -0.000002 0.011680 0.029307 0.000000 # Chi-squared of fit: 7.80 DOF: 42 RMS: 0.10 # Min/Max residuals: -0.25 0.17 # Exact a, adot, b, bdot, g, gdot: 1.903105E-05 3.859316E-02 2.977931E-06 1.163759E-02 2.983440E-02 -2.972133E-03 # Covariance matrix: 4.0032E-13 1.6784E-11 -6.4188E-14 5.2616E-12 1.0406E-11 4.4382E-10 1.6784E-11 1.4884E-09 -5.3803E-12 4.6090E-10 8.4325E-10 3.8893E-08 -6.4188E-14 -5.3803E-12 2.0496E-13 -1.8524E-12 -3.1521E-12 -1.4066E-10 5.2616E-12 4.6090E-10 -1.8524E-12 1.4302E-10 2.6138E-10 1.2046E-08 1.0406E-11 8.4325E-10 -3.1521E-12 2.6138E-10 5.0665E-10 2.2050E-08 4.4382E-10 3.8893E-08 -1.4066E-10 1.2046E-08 2.2050E-08 1.0165E-06 # lat0 lon0 xBary yBary zBary JD0 13.526442 -145.699448 0.491354 0.202722 -0.842358 2456742.057728 # Heliocentric elements and errors Epoch: 2456740.5000 = 2014/03/24 Mean Anomaly: 357.31527 +/- 0.731 Argument of Peri: 52.14801 +/- 3.715 Long of Asc Node: 176.64097 +/- 0.005 Inclination: 21.35674 +/- 0.002 Eccentricity: 0.60067853 +/- 0.0083 Semi-Major Axis: 85.18440643 +/- 1.3476 Time of Perihelion: 2458882.0929 +/- 580.9 Perihelion: 34.01596206 +/- 0.8891 Aphelion: 136.35285079 +/- 2.2703 Period (y) 786.2277 +/- 18.66 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -27.91495218 +/- 0.0203 Ecliptic Y -18.44561172 +/- 0.0138 Ecliptic Z 7.83986858 +/- 0.0059 Ecliptic XDOT 0.00241564 +/- 0.0001 Ecliptic YDOT -0.00263868 +/- 0.0001 Ecliptic ZDOT 0.00097467 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 34.36493396 +/- 0.0182 Geocenter to KBO 33.51835076 +/- 0.0253 # Hcoef: 8.67
The following table shows the complete astrometric record for 15FA490. 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 (15FA490) followed by the observatory code and reference code for the source of the astrometry.
2014 03 25.55695 14 26 15.56 -00 11 30.9 24.3y 15FA490 T09 C~8eRg 2014 03 25.58356 14 26 15.41 -00 11 30.4 23.7y 15FA490 T09 C~8eRg 2014 03 25.61968 14 26 15.27 -00 11 28.9 23.6y 15FA490 T09 C~8eRg 2014 03 25.63197 14 26 15.22 -00 11 28.6 23.3y 15FA490 T09 C~8eRg 2014 03 28.52423 14 26 03.49 -00 09 29.8 23.9i 15FA490 T09 C~8eRg 2014 03 28.54478 14 26 03.42 -00 09 29.0 23.6i 15FA490 T09 C~8eRg 2014 03 28.55746 14 26 03.35 -00 09 28.5 23.7i 15FA490 T09 C~8eRg 2014 03 28.57833 14 26 03.27 -00 09 27.8 23.7i 15FA490 T09 C~8eRg 2014 03 28.59923 14 26 03.18 -00 09 26.8 23.8i 15FA490 T09 C~8eRg 2015 03 20.58324 14 35 49.98 -00 20 58.4 24.0i 15FA490 T09 C~8eRg 2015 03 20.61088 14 35 49.89 -00 20 57.4 23.7i 15FA490 T09 C~8eRg 2015 03 20.62757 14 35 49.83 -00 20 56.7 23.9i 15FA490 T09 C~8eRg 2015 03 20.64485 14 35 49.77 -00 20 56.0 23.8i 15FA490 T09 C~8eRg 2015 03 25.63968 14 35 31.68 -00 17 31.1 25.1g 15FA490 T09 C~8eRg 2015 03 25.64187 14 35 31.68 -00 17 31.1 24.6g 15FA490 T09 C~8eRg 2015 03 25.64403 14 35 31.66 -00 17 30.7 25.0g 15FA490 T09 C~8eRg 2015 03 29.43882 14 35 16.75 -00 14 55.7 23.7y 15FA490 T09 C~8eRg 2015 03 29.44968 14 35 16.68 -00 14 55.2 23.6y 15FA490 T09 C~8eRg 2015 03 29.48264 14 35 16.56 -00 14 53.7 23.8y 15FA490 T09 C~8eRg 2015 03 29.54880 14 35 16.28 -00 14 51.1 23.7z 15FA490 T09 C~8eRg 2015 03 29.56398 14 35 16.23 -00 14 50.5 24.0z 15FA490 T09 C~8eRg 2015 03 29.57939 14 35 16.16 -00 14 50.0 23.4z 15FA490 T09 C~8eRg 2015 03 29.59297 14 35 16.09 -00 14 49.5 23.7z 15FA490 T09 C~8eRg 2015 03 29.60669 14 35 16.04 -00 14 48.8 23.7z 15FA490 T09 C~8eRg 2015 03 29.62041 14 35 15.98 -00 14 48.3 24.0z 15FA490 T09 C~8eRg
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 ( 0.29) 0.00 ( 0.66)
2 0.0001 -2.29 -0.11 -0.27 -0.11
3 0.0002 -4.77 -0.02 0.46 -0.06
4 0.0002 -5.57 0.04 0.50 -0.25
5 0.0081 -210.79 -0.11 54.88 0.12
6 0.0082 -212.04 0.15 55.29 0.17
7 0.0082 -213.20 -0.08 55.42 0.07
8 0.0083 -214.56 0.10 55.69 -0.03
9 0.0083 -216.17 0.03 56.19 0.10
10 0.9857 8329.28 -0.09 2295.92 0.04
11 0.9858 8327.68 0.06 2296.42 -0.05
12 0.9858 8326.59 0.03 2296.79 -0.04
13 0.9859 8325.51 0.05 2297.15 -0.05
14 0.9995 8001.42 -0.04 2401.59 -0.03
15 0.9995 8001.42 0.11 2401.59 -0.08
16 0.9996 8001.00 -0.16 2401.87 0.16
17 1.0099 7738.47 0.16 2474.82 0.01
18 1.0100 7737.31 -0.22 2474.95 -0.06
19 1.0101 7735.12 -0.02 2475.77 0.17
20 1.0102 7730.29 -0.04 2476.85 0.06
21 1.0103 7729.38 0.15 2477.17 0.11
22 1.0103 7728.22 0.11 2477.30 -0.04
23 1.0104 7727.07 -0.06 2477.42 -0.16
24 1.0104 7726.13 -0.00 2477.84 0.01
25 1.0104 7725.11 -0.02 2478.01 -0.06
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.
15FA490 quality flag:3 Type: SCATNEAR SCATNEAR SCATNEAR axisobj 83.895 86.256 83.284 ecceobj 0.595 0.612 0.591 incobj 21.415 21.410 21.417 qmin 32.669 32.321 32.634 qmax 141.321 147.924 143.770 amean 85.110 88.044 85.451 amin 83.349 86.079 83.284 amax 87.455 90.713 89.172 emean 0.599 0.618 0.601 emin 0.580 0.602 0.587 emax 0.618 0.633 0.618 imean 21.020 20.994 20.842 imin 19.660 20.092 19.642 imax 22.337 22.036 22.212 excite_mean 0.698 0.715 0.699 fracstop 1.000 1.000 1.000 cjmean 2.867 2.851 2.868 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 153.0 195.8 199.4 kozaiamp 121.0 133.4 180.0