(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 | 9.71 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.291312 ± 0.000000 au |
| Eccentricity | 0.022272313 ± 0.000000013 |
| Inclination | 28.758235904 ± 0.000000141 ° |
| Longitude of ascending node | 120.548423 ± 0.000000 ° |
| Argument of perihelia | 286.543039 ± 0.000022 ° |
| Mean anomaly | 68.619491 ± 0.000018 ° |
| Orbital period | 12.17 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 15440_Eioneus_nima_v2.bsp |
| Date of first observation | 1951-11-28 |
| Date of last observation | 2024-05-04 |
| Number of observations used in the fit | 4043 |
| Number of rejected observations | 66 |
| Number of DES observations | 0 |
| Number of MPC observations | 3651 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.122 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.021 | 0.009 |
| 2024-07 | 0.017 | 0.006 |
| 2025-01 | 0.028 | 0.006 |
| 2025-07 | 0.021 | 0.004 |
| 2026-01 | 0.030 | 0.001 |
| 2026-07 | 0.025 | 0.001 |
| 2027-01 | 0.028 | 0.008 |
| 2027-07 | 0.027 | 0.006 |
| 2028-01 | 0.025 | 0.010 |
Ephemeris comparison
Difference between NIMAv2 and JPL64 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.