(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Number of unpublished observations | 25 |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.