(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 (documentation) 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Number of unpublished observations 69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

residual plot

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

residual plot

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.