(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 ± 0.000000 au |
| Eccentricity | 0.052111575 ± 0.000000064 |
| Inclination | 28.511857784 ± 0.000003718 ° |
| Longitude of ascending node | 221.376450 ± 0.000006 ° |
| Argument of perihelia | 186.805852 ± 0.000060 ° |
| Mean anomaly | 291.368282 ± 0.000063 ° |
| Orbital period | 11.63 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 1583_Antilochus_nima_v4.bsp |
| Date of first observation | 1926-11-10 |
| Date of last observation | 2020-09-09 |
| Number of observations used in the fit | 2615 |
| Number of rejected observations | 19 |
| Number of DES observations | 0 |
| Number of MPC observations | 2609 |
| Number of unpublished observations | 25 |
| RMS of observations | 0.504 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2020-01 | 0.007 | 0.006 |
| 2020-07 | 0.007 | 0.006 |
| 2021-01 | 0.009 | 0.010 |
| 2021-07 | 0.014 | 0.011 |
| 2022-01 | 0.021 | 0.019 |
| 2022-07 | 0.022 | 0.015 |
| 2023-01 | 0.037 | 0.024 |
| 2023-07 | 0.030 | 0.016 |
| 2024-01 | 0.047 | 0.021 |
Ephemeris comparison
Difference between NIMAv4 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.