(60558) Echeclus
This object has a more recent orbit available here
Object
| Object | (60558) Echeclus |
| Diameter(1) | 64 km |
| Dynamic class(1) | Centaur |
| Absolute magnitude | 9.18 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 10.736711 ± 0.000001 au |
| Eccentricity | 0.457248066 ± 0.000000078 |
| Inclination | 4.343841522 ± 0.000000789 ° |
| Longitude of ascending node | 173.190430 ± 0.000048 ° |
| Argument of perihelia | 163.315390 ± 0.000048 ° |
| Mean anomaly | 74.560110 ± 0.000017 ° |
| Orbital period | 35.18 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv9 |
| Observation file |
omc_ast_NIMAv9.txt |
| bsp file | 60558_Echeclus_nima_v9.bsp |
| Date of first observation | 1979-09-23 |
| Date of last observation | 2021-12-31 |
| Number of observations used in the fit | 4403 |
| Number of rejected observations | 180 |
| Number of DES observations | 0 |
| Number of MPC observations | 4401 |
| Number of unpublished observations | 182 |
| RMS of observations | 0.465 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv9 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.007 | 0.005 |
| 2022-07 | 0.007 | 0.005 |
| 2023-01 | 0.010 | 0.006 |
| 2023-07 | 0.010 | 0.006 |
| 2024-01 | 0.014 | 0.008 |
| 2024-07 | 0.013 | 0.007 |
| 2025-01 | 0.017 | 0.009 |
| 2025-07 | 0.016 | 0.008 |
| 2026-01 | 0.021 | 0.010 |
Ephemeris comparison
Difference between NIMAv9 and JPL90 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.