(15440) Eioneus
This object has a more recent orbit available here
Object
| Object | (15440) Eioneus |
| Diameter(1) | 63 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 9.69 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460200.5 |
| Semi major axis | 5.293441 ± 0.000000 au |
| Eccentricity | 0.023073420 ± 0.000000014 |
| Inclination | 28.751815657 ± 0.000000140 ° |
| Longitude of ascending node | 120.552094 ± 0.000000 ° |
| Argument of perihelia | 286.227107 ± 0.000022 ° |
| Mean anomaly | 36.467846 ± 0.000019 ° |
| Orbital period | 12.18 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 15440_Eioneus_nima_v1.bsp |
| Date of first observation | 1951-11-28 |
| Date of last observation | 2023-11-18 |
| Number of observations used in the fit | 3430 |
| Number of rejected observations | 15 |
| Number of DES observations | 0 |
| Number of MPC observations | 2987 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.122 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.014 | 0.006 |
| 2023-07 | 0.013 | 0.006 |
| 2024-01 | 0.022 | 0.009 |
| 2024-07 | 0.018 | 0.007 |
| 2025-01 | 0.029 | 0.007 |
| 2025-07 | 0.022 | 0.005 |
| 2026-01 | 0.032 | 0.001 |
| 2026-07 | 0.026 | 0.001 |
| 2027-01 | 0.029 | 0.008 |
Ephemeris comparison
Difference between NIMAv1 and JPL61 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.