(3548) Eurybates


Object

Object (3548) Eurybates
Diameter(1) 64 km
Dynamic class(1) trojan
Absolute magnitude 9.85
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2457063.905945957
Semi major axis 5.185364 ± 0.000000 au
Eccentricity 0.089842602 ± 0.000000010
Inclination 8.066959674 ± 0.000000613 °
Longitude of ascending node 43.570471 ± 0.000003 °
Argument of perihelia 28.043791 ± 0.000010 °
Mean anomaly 142.239407 ± 0.000011 °
Orbital period 11.81 yr

Ephemeris & Observations

Ephemeris version NIMAv7
Observation file (documentation) omc_ast_NIMAv7.txt
bsp file 3548_Eurybates_nima_v7.bsp
Date of first observation 1954-02-09
Date of last observation 2023-05-15
Number of observations used in the fit 4679
Number of rejected observations 79
Number of DES observations 0
Number of MPC observations 4479
Number of unpublished observations 28
RMS of observations 0.120 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2023-01 0.002 0.002
2023-07 0.003 0.002
2024-01 0.007 0.004
2024-07 0.006 0.003
2025-01 0.010 0.006
2025-07 0.009 0.005
2026-01 0.012 0.007
2026-07 0.012 0.007
2027-01 0.012 0.006

Ephemeris comparison

residual plot

Difference between NIMAv7 and JPL59 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.

Previous NIMA versions