(911) Agamemnon
This object has a more recent orbit available here
Object
Object | (911) Agamemnon |
Diameter(1) | 131 km |
Dynamic class(1) | trojan |
Absolute magnitude | 8.04 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2459800.5 |
Semi major axis | 5.281169 ± 0.000000 au |
Eccentricity | 0.067427754 ± 0.000000008 |
Inclination | 21.762039029 ± 0.000000125 ° |
Longitude of ascending node | 338.004800 ± 0.000001 ° |
Argument of perihelia | 81.243777 ± 0.000011 ° |
Mean anomaly | 5.934750 ± 0.000010 ° |
Orbital period | 12.14 yr |
Ephemeris & Observations
Ephemeris version | NIMAv6 |
Observation file |
omc_ast_NIMAv6.txt |
bsp file | 911_Agamemnon_nima_v6.bsp |
Date of first observation | 1919-03-19 |
Date of last observation | 2023-04-22 |
Number of observations used in the fit | 3957 |
Number of rejected observations | 20 |
Number of DES observations | 0 |
Number of MPC observations | 3682 |
Number of unpublished observations | 69 |
RMS of observations | 0.125 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 | 0.009 | 0.001 |
2023-07 | 0.006 | 0.002 |
2024-01 | 0.009 | 0.005 |
2024-07 | 0.007 | 0.005 |
2025-01 | 0.009 | 0.009 |
2025-07 | 0.008 | 0.007 |
2026-01 | 0.010 | 0.010 |
2026-07 | 0.009 | 0.009 |
2027-01 | 0.011 | 0.008 |
Ephemeris comparison

Difference between NIMAv6 and JPL116 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.