Comparison of the Orbital Properties of the Milky Way Globular Clusters from the Data of the Gaia DR2 and EDR3 Catalogs

TL;DR

This study updates the orbital parameters of 152 Milky Way globular clusters using Gaia EDR3 data, compares them with previous DR2-based calculations, and identifies clusters with significant orbital changes.

Contribution

It provides new orbital data for globular clusters based on Gaia EDR3 and refines the galactic potential model using extended rotation curve data.

Findings

Orbital parameters were recalculated with Gaia EDR3 proper motions.

Significant orbital changes were identified for some clusters.

Refined galactic potential model using rotation curve data.

Abstract

We provide new values of the orbital parameters of 152 globular clusters, which are calculated using the new mean proper motions obtained from the Gaia EDR3 catalog data. The orbits were integrated 5 Gyr back in an axisymmetric three-component potential with a spherical bulge, disk component, and spherical dark halo in the Navarro-Frenk-White form, which we refined using the rotation curve of objects with large galactocentric distances up to 200 kpc. The obtained orbital parameters were compared with the orbital parameters of the same globular clusters calculated earlier in the same gravitational potential using proper motions from the Gaia DR2 catalog data. The objects whose orbits underwent significant changes were identified.