(15440) Eioneus
Object
| Object |
(15440) Eioneus |
| Diameter(1) |
63 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
9.70 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.289302 ± 0.000000 au |
| Eccentricity |
0.021802459 ± 0.000000012 |
| Inclination |
28.763011076 ± 0.000000141 ° |
| Longitude of ascending node |
120.549587 ± 0.000000 ° |
| Argument of perihelia |
285.813285 ± 0.000022 ° |
| Mean anomaly |
85.594868 ± 0.000018 ° |
| Orbital period |
12.16 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv3 |
| Observation file (documentation) |
omc_ast_NIMAv3.txt |
| bsp file |
15440_Eioneus_nima_v3.bsp |
| Date of first observation |
1951-11-28 |
| Date of last observation |
2025-06-07 |
| Number of observations used in the fit |
4717 |
| Number of rejected observations |
66 |
| Number of DES observations |
0 |
| Number of MPC observations |
4325 |
| Number of unpublished observations |
0 |
| RMS of observations |
0.122 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.019 |
0.008 |
| 2024-07 |
0.015 |
0.006 |
| 2025-01 |
0.025 |
0.006 |
| 2025-07 |
0.018 |
0.004 |
| 2026-01 |
0.026 |
0.001 |
| 2026-07 |
0.022 |
0.001 |
| 2027-01 |
0.025 |
0.007 |
| 2027-07 |
0.024 |
0.005 |
| 2028-01 |
0.022 |
0.009 |
Ephemeris comparison
Difference between NIMAv3 and JPL69 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.
Previous NIMA versions