(588) Achilles
Object
| Object |
(588) Achilles |
| Diameter(1) |
130 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
8.27 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
5.209204 ± 0.000000 au |
| Eccentricity |
0.148138755 ± 0.000000046 |
| Inclination |
10.319917607 ± 0.000004173 ° |
| Longitude of ascending node |
316.534960 ± 0.000019 ° |
| Argument of perihelia |
133.588645 ± 0.000027 ° |
| Mean anomaly |
337.916820 ± 0.000017 ° |
| Orbital period |
11.89 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv7 |
| Observation file (documentation) |
omc_ast_NIMAv7.txt |
| bsp file |
588_Achilles_nima_v7.bsp |
| Date of first observation |
1906-02-22 |
| Date of last observation |
2023-04-12 |
| Number of observations used in the fit |
3577 |
| Number of rejected observations |
44 |
| Number of DES observations |
0 |
| Number of MPC observations |
3571 |
| Number of unpublished observations |
50 |
| RMS of observations |
3.970 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2023-01 |
0.026 |
0.022 |
| 2023-07 |
0.022 |
0.015 |
| 2024-01 |
0.038 |
0.024 |
| 2024-07 |
0.027 |
0.016 |
| 2025-01 |
0.039 |
0.026 |
| 2025-07 |
0.033 |
0.021 |
| 2026-01 |
0.039 |
0.022 |
| 2026-07 |
0.039 |
0.024 |
| 2027-01 |
0.039 |
0.017 |
Ephemeris comparison
Difference between NIMAv7 and JPL103 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