(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 | 9.50 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 10.690938 ± 0.000003 au |
| Eccentricity | 0.456454679 ± 0.000000135 |
| Inclination | 4.343403183 ± 0.000007746 ° |
| Longitude of ascending node | 173.303702 ± 0.000072 ° |
| Argument of perihelia | 162.808920 ± 0.000060 ° |
| Mean anomaly | 41.343959 ± 0.000018 ° |
| Orbital period | 34.96 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 60558_Echeclus_nima_v4.bsp |
| Date of first observation | 1979-09-23 |
| Date of last observation | 2016-12-30 |
| Number of observations used in the fit | 2306 |
| Number of rejected observations | 64 |
| Number of DES observations | 0 |
| Number of MPC observations | 2302 |
| Number of unpublished observations | 68 |
| RMS of observations | 0.421 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.034 | 0.026 |
| 2018-07 | 0.039 | 0.024 |
| 2019-01 | 0.049 | 0.030 |
| 2019-07 | 0.048 | 0.026 |
| 2020-01 | 0.060 | 0.032 |
| 2020-07 | 0.055 | 0.027 |
| 2021-01 | 0.069 | 0.032 |
| 2021-07 | 0.062 | 0.027 |
| 2022-01 | 0.077 | 0.032 |
Ephemeris comparison
Difference between NIMAv4 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.