(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 | 8.60 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.132436 ± 0.000001 au |
| Eccentricity | 0.052111566 ± 0.000000087 |
| Inclination | 28.511856357 ± 0.000006038 ° |
| Longitude of ascending node | 221.376443 ± 0.000015 ° |
| Argument of perihelia | 186.805889 ± 0.000118 ° |
| Mean anomaly | 291.368248 ± 0.000124 ° |
| Orbital period | 11.63 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 1583_Antilochus_nima_v2.bsp |
| Date of first observation | 1926-11-10 |
| Date of last observation | 2019-08-12 |
| Number of observations used in the fit | 2169 |
| Number of rejected observations | 13 |
| Number of DES observations | 0 |
| Number of MPC observations | 2182 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.547 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.023 | 0.020 |
| 2019-07 | 0.032 | 0.024 |
| 2020-01 | 0.030 | 0.022 |
| 2020-07 | 0.040 | 0.023 |
| 2021-01 | 0.046 | 0.025 |
| 2021-07 | 0.048 | 0.023 |
| 2022-01 | 0.067 | 0.033 |
| 2022-07 | 0.054 | 0.025 |
| 2023-01 | 0.081 | 0.038 |
Ephemeris comparison
Difference between NIMAv2 and JPL34 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.