# Astrometric Interferometry

## TL;DR

This paper reviews astrometric interferometry, highlighting its potential for high-precision measurements of celestial objects and discussing the fundamental limits and capabilities of various astrometric techniques, including ground-based methods.

## Contribution

It provides an overview of interferometric astrometry within the broader context of astrometric techniques and discusses the potential for achieving micro-arcsecond precision with advanced instrumentation.

## Key findings

- Ground-based techniques can reach micro-arcsecond accuracy with proper instrumentation.
- Interferometric astrometry complements space-based and adaptive optics methods.
- Fundamental limits suggest high-precision astrometry is feasible with current or near-future technology.

## Abstract

Astrometry is a powerful technique in astrophysics to measure three-dimensional positions of stars and other astrophysical objects, including exoplanets and the gravitational influence they have on each other. Interferometric astrometry is presented here as just one in a suite of powerful astrometric techniques, which include space-based, seeing-limited and wide-angle adaptive optics techniques. Fundamental limits are discussed, demonstrating that even ground-based techniques have the capability for astrometry at the single micro-arcsecond level, should sufficiently sophisticated instrumentation be constructed for both the current generation of single telescopes and long-baseline optical interferometers.