(60558) Echeclus
Object
| Object |
(60558) Echeclus |
| Diameter(1) |
60 km |
| Dynamic class(1) |
Centaur |
| Absolute magnitude |
9.19 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
10.758898 ± 0.000001 au |
| Eccentricity |
0.454914418 ± 0.000000077 |
| Inclination |
4.341174807 ± 0.000000789 ° |
| Longitude of ascending node |
173.244860 ± 0.000048 ° |
| Argument of perihelia |
163.525982 ± 0.000048 ° |
| Mean anomaly |
102.432186 ± 0.000023 ° |
| Orbital period |
35.29 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv12 |
| Observation file (documentation) |
omc_ast_NIMAv12.txt |
| bsp file |
60558_Echeclus_nima_v12.bsp |
| Date of first observation |
1979-09-23 |
| Date of last observation |
2025-02-25 |
| Number of observations used in the fit |
4522 |
| Number of rejected observations |
185 |
| Number of DES observations |
0 |
| Number of MPC observations |
4525 |
| Number of unpublished observations |
182 |
| RMS of observations |
0.463 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv12 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.014 |
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 |
| 2026-07 |
0.019 |
0.009 |
| 2027-01 |
0.024 |
0.012 |
| 2027-07 |
0.022 |
0.010 |
| 2028-01 |
0.028 |
0.013 |
Ephemeris comparison
Difference between NIMAv12 and JPL119 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.
Previous NIMA versions