(60558) Echeclus
This object has a more recent orbit available here
Object
| Object | (60558) Echeclus |
| Diameter(1) | 87 km |
| Dynamic class(1) | Centaur |
| Absolute magnitude | 9.50 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 10.690938 ± 0.000002 au |
| Eccentricity | 0.456454680 ± 0.000000113 |
| Inclination | 4.343406860 ± 0.000003126 ° |
| Longitude of ascending node | 173.303489 ± 0.000137 ° |
| Argument of perihelia | 162.809141 ± 0.000135 ° |
| Mean anomaly | 41.343966 ± 0.000015 ° |
| Orbital period | 34.96 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 60558_Echeclus_nima_v5.bsp |
| Date of first observation | 1979-09-23 |
| Date of last observation | 2019-10-25 |
| Number of observations used in the fit | 560 |
| Number of rejected observations | 3422 |
| Number of DES observations | 0 |
| Number of MPC observations | 3845 |
| Number of unpublished observations | 137 |
| RMS of observations | 0.584 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.039 | 0.016 |
| 2019-07 | 0.035 | 0.009 |
| 2020-01 | 0.045 | 0.009 |
| 2020-07 | 0.040 | 0.006 |
| 2021-01 | 0.051 | 0.008 |
| 2021-07 | 0.046 | 0.009 |
| 2022-01 | 0.057 | 0.013 |
| 2022-07 | 0.050 | 0.013 |
| 2023-01 | 0.063 | 0.018 |
Ephemeris comparison
Difference between NIMAv5 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.