(3548) Eurybates
This object has a more recent orbit available here
Object
Object | (3548) Eurybates |
Diameter(1) | 64 km |
Dynamic class(1) | trojan |
Absolute magnitude | 9.87 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2460600.5 |
Semi major axis | 5.212167 ± 0.000000 au |
Eccentricity | 0.091209659 ± 0.000000010 |
Inclination | 8.054036680 ± 0.000000612 ° |
Longitude of ascending node | 43.544094 ± 0.000003 ° |
Argument of perihelia | 28.160211 ± 0.000009 ° |
Mean anomaly | 76.603419 ± 0.000007 ° |
Orbital period | 11.90 yr |
Ephemeris & Observations
Ephemeris version | NIMAv8 |
Observation file |
omc_ast_NIMAv8.txt |
bsp file | 3548_Eurybates_nima_v8.bsp |
Date of first observation | 1954-02-09 |
Date of last observation | 2024-06-15 |
Number of observations used in the fit | 5594 |
Number of rejected observations | 86 |
Number of DES observations | 0 |
Number of MPC observations | 5401 |
Number of unpublished observations | 28 |
RMS of observations | 0.120 arcsec |
Residuals

Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
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 | 0.011 | 0.007 |
2026-07 | 0.012 | 0.007 |
2027-01 | 0.012 | 0.006 |
2027-07 | 0.015 | 0.007 |
2028-01 | 0.013 | 0.004 |
Ephemeris comparison

Difference between NIMAv8 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.