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: 18FO76 # Created Sun Dec 22 02:11:02 2024 # Orbit generated by ELGB # -->Covariance matrix from a Bernstein fit # Fitting 27 observations of 27 # Arc: 5.02y # First observation: 2014/03/01 # Last observation: 2019/03/08 # Chi-squared of fit: 54.41 DOF: 48 RMS: 0.25 # Min/Max residuals: -1.51 0.57 # Exact a, adot, b, bdot, g, gdot: 1.230647E-05 1.811828E-02 6.988460E-06 1.018445E-02 2.292979E-02 -2.388783E-03 # Covariance matrix: 2.0673E-13 -8.5654E-14 9.4408E-15 -2.5233E-14 1.3394E-14 -4.8277E-13 -8.5654E-14 1.6593E-13 -3.3585E-14 8.8567E-14 1.1501E-13 1.6913E-12 9.4408E-15 -3.3585E-14 1.9273E-13 -6.0981E-14 -2.6658E-14 -3.7176E-13 -2.5233E-14 8.8567E-14 -6.0981E-14 6.4402E-14 6.8482E-14 9.8015E-13 1.3394E-14 1.1501E-13 -2.6658E-14 6.8482E-14 3.3803E-13 1.3028E-12 -4.8277E-13 1.6913E-12 -3.7176E-13 9.8015E-13 1.3028E-12 1.8717E-11 # lat0 lon0 xBary yBary zBary JD0 -1.047061 170.983435 0.183062 -0.017615 -0.971609 2456717.604462 # Heliocentric elements and errors Epoch: 2456718.5000 = 2014/03/02 Mean Anomaly: 250.00813 +/- 0.061 Argument of Peri: 120.93517 +/- 0.052 Long of Asc Node: 172.56920 +/- 0.000 Inclination: 29.32956 +/- 0.000 Eccentricity: 0.12878293 +/- 0.0002 Semi-Major Axis: 42.15480820 +/- 0.0040 Time of Perihelion: 2487262.5903 +/- 19.5 Perihelion: 36.72598833 +/- 0.0079 Aphelion: 47.58362807 +/- 0.0084 Period (y) 273.7026 +/- 0.04 # Ecliptic coordinates at JD0 (AU and AU/d) Ecliptic X -43.99779355 +/- 0.0011 Ecliptic Y 7.16832411 +/- 0.0002 Ecliptic Z -0.79667625 +/- 0.0000 Ecliptic XDOT -0.00008509 +/- 0.0000 Ecliptic YDOT -0.00218080 +/- 0.0000 Ecliptic ZDOT 0.00122118 +/- 0.0000 # Distances at JD0 (AU) Heliocenter to KBO 44.58510805 +/- 0.0011 Geocenter to KBO 43.61148398 +/- 0.0011 # Hcoef: 7.13
The following table shows the complete astrometric record for 18FO76. 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 (18FO76) followed by the observatory code and reference code for the source of the astrometry.
2014 03 01.103684 11 25 12.99 +02 36 41.4 23.8g 18FO76 W84 C~8SeA 2014 03 01.208903 11 25 12.54 +02 36 45.0 23.4g 18FO76 W84 C~8SeA 2014 03 05.195696 11 24 55.81 +02 38 55.9 23.7g 18FO76 W84 C~8SeA 2014 03 05.289006 11 24 55.41 +02 38 59.0 23.7g 18FO76 W84 C~8SeA 2014 05 24.288462 11 20 50.90 +03 14 18.1 18FO76 T14 C~8SeA 2014 05 24.315864 11 20 50.87 +03 14 18.4 18FO76 T14 C~8SeA 2015 01 25.560753 11 32 01.18 +02 27 45.5 18FO76 T09 C~8SeA 2015 01 25.562287 11 32 01.17 +02 27 45.5 18FO76 T09 C~8SeA 2015 01 25.625783 11 32 01.00 +02 27 47.1 18FO76 T09 C~8SeA 2017 03 23.210334 11 38 00.53 +03 11 57.2 23.4R 18FO76 W84 C~8SeA 2018 03 18.45971 11 43 12.04 +03 16 41.9 23.2i 18FO76 T09 C~8SeA 2018 03 18.50571 11 43 11.83 +03 16 43.4 23.1i 18FO76 T09 C~8SeA 2018 03 18.56269 11 43 11.60 +03 16 45.4 23.1i 18FO76 T09 C~8SeA 2018 03 18.57604 11 43 11.53 +03 16 45.7 23.1i 18FO76 T09 C~8SeA 2018 04 24.35538 11 40 49.60 +03 35 31.9 23.3z 18FO76 T09 C~8SeA 2018 04 24.40148 11 40 49.46 +03 35 33.1 23.6z 18FO76 T09 C~8SeA 2018 04 24.44523 11 40 49.32 +03 35 34.2 23.1z 18FO76 T09 C~8SeA 2019 02 02.656217 11 50 50.67 +03 00 41.1 18FO76 T09 C~8SeA 2019 02 05.471236 11 50 42.49 +03 01 57.9 18FO76 T09 C~8SeA 2019 02 05.511564 11 50 42.37 +03 01 59.0 18FO76 T09 C~8SeA 2019 03 02.43427 11 49 12.20 +03 14 58.5 23.2y 18FO76 T09 C~8SeA 2019 03 02.53236 11 49 11.89 +03 15 01.2 23.7y 18FO76 T09 C~8SeA 2019 03 02.55921 11 49 11.79 +03 15 02.2 23.2y 18FO76 T09 C~8SeA 2019 03 02.61357 11 49 11.56 +03 15 03.9 23.8y 18FO76 T09 C~8SeA 2019 03 08.37068 11 48 47.69 +03 18 19.9 23.8r 18FO76 T09 C~8SeA 2019 03 08.40431 11 48 47.55 +03 18 20.5 23.5r 18FO76 T09 C~8SeA 2019 03 08.43394 11 48 47.42 +03 18 21.9 24.0r 18FO76 T09 C~8SeA
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 -0.01
2 0.0003 0.00 -0.03 0.00 0.16
3 0.0112 0.00 -0.04 0.00 -0.02
4 0.0115 0.00 -0.03 0.00 -0.01
5 0.2305 0.00 0.10 0.00 0.00
6 0.2306 0.00 -0.05 0.00 -0.02
7 0.9047 0.00 0.02 0.00 -0.03
8 0.9047 0.00 -0.07 0.00 -0.06
9 0.9049 0.00 -0.05 0.00 0.11
10 3.0612 0.00 0.16 0.00 -0.15
11 4.0475 0.00 0.06 0.00 0.02
12 4.0476 0.00 -0.09 0.00 -0.04
13 4.0478 0.00 0.17 0.00 0.03
14 4.0478 0.00 -0.02 0.00 -0.12
15 4.1485 0.00 -0.15 0.00 -0.06
16 4.1487 0.00 -0.03 0.00 -0.02
17 4.1488 0.00 -0.04 0.00 -0.02
18 4.9269 0.00 0.17 0.00 -0.03
19 4.9346 0.00 0.15 0.00 0.06
20 4.9347 0.00 0.21 0.00 0.04
21 5.0030 0.00 -1.51 0.00 0.57
22 5.0032 0.00 -0.03 0.00 -0.03
23 5.0033 0.00 0.14 0.00 0.06
24 5.0034 0.00 0.08 0.00 -0.07
25 5.0192 0.00 0.23 0.00 0.14
26 5.0193 0.00 0.29 0.00 -0.42
27 5.0194 0.00 0.24 0.00 -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.
18FO76 quality flag:3 Type: SCATEXTD SCATEXTD SCATEXTD axisobj 41.933 41.932 41.933 ecceobj 0.132 0.132 0.132 incobj 29.444 29.444 29.444 qmin 35.874 35.871 35.857 qmax 48.503 48.500 48.516 amean 42.056 42.057 42.058 amin 41.718 41.717 41.715 amax 42.419 42.428 42.425 emean 0.126 0.126 0.126 emin 0.108 0.108 0.108 emax 0.144 0.144 0.144 imean 28.978 28.978 28.978 imin 28.571 28.568 28.569 imax 29.382 29.385 29.401 excite_mean 0.501 0.501 0.501 fracstop 1.000 1.000 1.000 cjmean 2.768 2.768 2.768 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 179.3 179.3 179.5 kozaiamp 180.0 179.9 180.0