(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 9.85
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2457063.905945957
Semi major axis 5.185364 ± 0.000001 au
Eccentricity 0.089842570 ± 0.000000085
Inclination 8.066958380 ± 0.000007349 °
Longitude of ascending node 43.570516 ± 0.000047 °
Argument of perihelia 28.043745 ± 0.000060 °
Mean anomaly 142.239400 ± 0.000074 °
Orbital period 11.81 yr

Ephemeris & Observations

Ephemeris version NIMAv5
Observation file (documentation) omc_ast_NIMAv5.txt
bsp file 3548_Eurybates_nima_v5.bsp
Date of first observation 1954-02-09
Date of last observation 2020-11-08
Number of observations used in the fit 2177
Number of rejected observations 10
Number of DES observations 0
Number of MPC observations 2161
Number of unpublished observations 26
RMS of observations 0.463 arcsec

Residuals

residual plot

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)
2021-01 0.029 0.025
2021-07 0.033 0.024
2022-01 0.048 0.035
2022-07 0.043 0.025
2023-01 0.071 0.037
2023-07 0.049 0.025
2024-01 0.068 0.040
2024-07 0.049 0.027
2025-01 0.054 0.037

Ephemeris comparison

residual plot

Difference between NIMAv5 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.