(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 | 8.62 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 5.141840 ± 0.000000 au |
| Eccentricity | 0.053780191 ± 0.000000009 |
| Inclination | 28.492330640 ± 0.000000393 ° |
| Longitude of ascending node | 221.381895 ± 0.000000 ° |
| Argument of perihelia | 187.121239 ± 0.000012 ° |
| Mean anomaly | 32.730977 ± 0.000011 ° |
| Orbital period | 11.66 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 1583_Antilochus_nima_v6.bsp |
| Date of first observation | 1926-11-10 |
| Date of last observation | 2023-05-08 |
| Number of observations used in the fit | 4500 |
| Number of rejected observations | 27 |
| Number of DES observations | 0 |
| Number of MPC observations | 4162 |
| Number of unpublished observations | 25 |
| RMS of observations | 0.121 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.014 | 0.005 |
| 2023-07 | 0.011 | 0.003 |
| 2024-01 | 0.017 | 0.005 |
| 2024-07 | 0.013 | 0.003 |
| 2025-01 | 0.018 | 0.002 |
| 2025-07 | 0.016 | 0.002 |
| 2026-01 | 0.017 | 0.002 |
| 2026-07 | 0.018 | 0.002 |
| 2027-01 | 0.016 | 0.004 |
Ephemeris comparison
Difference between NIMAv6 and JPL66 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.