(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 | 0.053780183 ± 0.000000043 |
| Inclination | 28.492331714 ± 0.000003809 ° |
| Longitude of ascending node | 221.381893 ± 0.000006 ° |
| Argument of perihelia | 187.121259 ± 0.000046 ° |
| Mean anomaly | 32.730961 ± 0.000041 ° |
| Orbital period | 11.66 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 1583_Antilochus_nima_v5.bsp |
| Date of first observation | 1926-11-10 |
| Date of last observation | 2022-04-14 |
| Number of observations used in the fit | 3637 |
| Number of rejected observations | 24 |
| Number of DES observations | 0 |
| Number of MPC observations | 3636 |
| Number of unpublished observations | 25 |
| RMS of observations | 0.427 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.019 | 0.017 |
| 2022-07 | 0.020 | 0.014 |
| 2023-01 | 0.034 | 0.023 |
| 2023-07 | 0.028 | 0.015 |
| 2024-01 | 0.044 | 0.020 |
| 2024-07 | 0.035 | 0.013 |
| 2025-01 | 0.046 | 0.010 |
| 2025-07 | 0.041 | 0.007 |
| 2026-01 | 0.043 | 0.007 |
Ephemeris comparison
Difference between NIMAv5 and JPL60 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.