(60558) Echeclus
Object
| Object |
(60558) Echeclus |
| Diameter(1) |
64 km |
| Dynamic class(1) |
Centaur |
| Absolute magnitude |
9.18 |
| G slop |
0.15 |
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 (documentation) |
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| Number of unpublished observations |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.
Previous NIMA versions