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: 18FP76
# Created Tue Apr 1 01:11:09 2025
# Orbit generated from Bernstein formalism
# Fitting 15 observations of 15
# Arc: 3.96y
# First observation: 2015/03/23
# Last observation: 2019/03/08
Preliminary a, adot, b, bdot, g, gdot:
0.000023 0.022923 -0.000000 -0.001564 0.024024 0.000000
# Chi-squared of fit: 3.68 DOF: 24 RMS: 0.09
# Min/Max residuals: -0.19 0.18
# Exact a, adot, b, bdot, g, gdot:
1.425386E-05 2.298891E-02 -4.836845E-07 -1.568910E-03 2.399442E-02 4.528368E-04
# Covariance matrix:
4.8899E-13 -2.7304E-13 -1.6817E-15 9.1076E-15 -1.2528E-13 -1.6006E-12
-2.7304E-13 1.3207E-12 1.6451E-14 -8.8608E-14 2.0582E-12 1.5735E-11
-1.6817E-15 1.6451E-14 4.6233E-13 -1.3821E-13 2.7307E-14 2.0454E-13
9.1076E-15 -8.8608E-14 -1.3821E-13 5.7811E-14 -1.4670E-13 -1.1014E-12
-1.2528E-13 2.0582E-12 2.7307E-14 -1.4670E-13 4.0755E-12 2.6182E-11
-1.6006E-12 1.5735E-11 2.0454E-13 -1.1014E-12 2.6182E-11 1.9570E-10
# lat0 lon0 xBary yBary zBary JD0
2.033001 172.765345 -0.159858 0.034914 -0.979895 2457104.668729
# Heliocentric elements and errors
Epoch: 2457100.5000 = 2015/03/19
Mean Anomaly: 84.65267 +/- 0.369
Argument of Peri: 65.53153 +/- 0.454
Long of Asc Node: 19.91666 +/- 0.003
Inclination: 4.37766 +/- 0.001
Eccentricity: 0.02446098 +/- 0.0006
Semi-Major Axis: 42.73145492 +/- 0.0097
Time of Perihelion: 2433108.9609 +/- 104.2
Perihelion: 41.68620183 +/- 0.0272
Aphelion: 43.77670801 +/- 0.0273
Period (y) 279.3378 +/- 0.10
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X -42.31459117 +/- 0.0035
Ecliptic Y 5.20984941 +/- 0.0004
Ecliptic Z 1.47846809 +/- 0.0001
Ecliptic XDOT -0.00039124 +/- 0.0000
Ecliptic YDOT -0.00260073 +/- 0.0000
Ecliptic ZDOT -0.00017698 +/- 0.0000
# Distances at JD0 (AU)
Heliocenter to KBO 42.65973540 +/- 0.0034
Geocenter to KBO 41.67635488 +/- 0.0035
# Hcoef: 7.65
The following table shows the complete astrometric record for 18FP76. 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 (18FP76) followed by the observatory code and reference code for the source of the astrometry.
2015 03 23.167951 11 36 39.03 +04 44 18.9 18FP76 695 C~8SeA 2015 03 23.232176 11 36 38.73 +04 44 20.8 18FP76 695 C~8SeA 2015 03 23.291458 11 36 38.46 +04 44 22.6 18FP76 695 C~8SeA 2018 03 10.491847 11 51 41.39 +02 49 15.1 18FP76 T09 C~8SeA 2018 03 18.46645 11 51 05.93 +02 52 59.2 23.9i 18FP76 T09 C~8SeA 2018 03 18.49491 11 51 05.80 +02 52 59.8 23.8i 18FP76 T09 C~8SeA 2018 03 18.56536 11 51 05.49 +02 53 01.9 23.8i 18FP76 T09 C~8SeA 2018 04 24.35876 11 48 34.64 +03 08 12.1 23.6z 18FP76 T09 C~8SeA 2018 04 24.40415 11 48 34.48 +03 08 13.1 23.9z 18FP76 T09 C~8SeA 2018 04 24.43452 11 48 34.38 +03 08 13.6 23.6z 18FP76 T09 C~8SeA 2018 04 24.49071 11 48 34.19 +03 08 14.8 23.4z 18FP76 T09 C~8SeA 2019 02 04.622566 11 58 32.05 +01 58 34.0 18FP76 T09 C~8SeA 2019 02 04.651991 11 58 31.98 +01 58 34.5 18FP76 T09 C~8SeA 2019 02 05.460553 11 58 29.58 +01 58 50.9 18FP76 T09 C~8SeA 2019 03 08.362302 11 56 32.34 +02 11 40.4 18FP76 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 0.18 0.00 -0.11
2 0.0002 -4.87 -0.03 -0.03 -0.04
3 0.0003 -9.29 -0.15 0.02 0.12
4 2.9660 15164.75 0.08 -958.10 -0.06
5 2.9878 14585.22 -0.10 -965.05 0.08
6 2.9879 14583.18 -0.03 -965.28 -0.10
7 2.9881 14578.06 0.04 -965.21 0.07
8 3.0888 12132.71 0.01 -1033.36 -0.04
9 3.0889 12130.10 -0.07 -1033.40 0.05
10 3.0890 12128.53 0.04 -1033.54 0.01
11 3.0892 12125.43 0.04 -1033.58 0.13
12 3.8726 22078.72 -0.19 -1282.45 -0.02
13 3.8726 22077.55 0.12 -1282.42 0.01
14 3.8749 22037.56 0.08 -1281.81 0.00
15 3.9595 20098.98 -0.01 -1280.88 -0.10
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.
18FP76 quality flag:3 Type: CLASSICAL CLASSICAL CLASSICAL axisobj 42.388 42.414 42.361 ecceobj 0.027 0.025 0.028 incobj 4.394 4.394 4.394 qmin 39.843 40.009 38.824 qmax 45.462 45.272 46.468 amean 42.528 42.555 42.501 amin 42.198 42.231 42.163 amax 42.880 42.895 42.859 emean 0.039 0.036 0.058 emin 0.017 0.015 0.018 emax 0.060 0.056 0.085 imean 3.743 3.709 3.901 imin 2.426 2.478 2.358 imax 4.726 4.719 5.047 excite_mean 0.077 0.075 0.091 fracstop 1.000 1.000 1.000 cjmean 3.077 3.078 3.074 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 176.9 176.8 178.4 kozaiamp 180.0 179.9 180.0