(1583) Antilochus
This object has a more recent orbit available here
Object
| Object | (1583) Antilochus |
| Diameter(1) | 109 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 8.66 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.149053 ± 0.000000 au |
| Eccentricity | 0.053750584 ± 0.000000009 |
| Inclination | 28.489614312 ± 0.000000393 ° |
| Longitude of ascending node | 221.375452 ± 0.000000 ° |
| Argument of perihelia | 188.676962 ± 0.000012 ° |
| Mean anomaly | 98.800747 ± 0.000010 ° |
| Orbital period | 11.68 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv7 |
| Observation file |
omc_ast_NIMAv7.txt |
| bsp file | 1583_Antilochus_nima_v7.bsp |
| Date of first observation | 1926-11-10 |
| Date of last observation | 2024-06-18 |
| Number of observations used in the fit | 5507 |
| Number of rejected observations | 30 |
| Number of DES observations | 0 |
| Number of MPC observations | 5172 |
| Number of unpublished observations | 25 |
| RMS of observations | 0.121 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) |
| 2024-01 | 0.016 | 0.005 |
| 2024-07 | 0.013 | 0.003 |
| 2025-01 | 0.017 | 0.002 |
| 2025-07 | 0.015 | 0.002 |
| 2026-01 | 0.017 | 0.002 |
| 2026-07 | 0.018 | 0.002 |
| 2027-01 | 0.016 | 0.004 |
| 2027-07 | 0.019 | 0.004 |
| 2028-01 | 0.015 | 0.005 |
Ephemeris comparison
Difference between NIMAv7 and JPL73 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.